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X-WR-CALDESC:Events for Orange County Astronomers
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BEGIN:VEVENT
DTSTART;VALUE=DATE:20210219
DTEND;VALUE=DATE:20210220
DTSTAMP:20260409T105405
CREATED:20201128T195910Z
LAST-MODIFIED:20201128T195910Z
UID:10001053-1613692800-1613779199@www.ocastronomers.org
SUMMARY:First Quarter Moon
DESCRIPTION:Views: 2
URL:https://www.ocastronomers.org/calendar/first-quarter-moon-3/
CATEGORIES:Moon Phases
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/moon_1st-quarter.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210213T220000
DTEND;TZID=America/Los_Angeles:20210213T233000
DTSTAMP:20260409T105405
CREATED:20210107T182451Z
LAST-MODIFIED:20210127T222923Z
UID:10001064-1613253600-1613259000@www.ocastronomers.org
SUMMARY:Open Spiral Bar
DESCRIPTION:This event is free and open to public\, to attend please register using the zoom.us link on the box above. \nCome and socialize with your fellow astronomy enthusiasts face-to-face virtually!\nBring your latest astrophotos\, mini-presentation\, questions or none and your own refreshments. \n \nViews: 2
URL:https://www.ocastronomers.org/calendar/open-spiral-bar-2021-02/
LOCATION:Online
CATEGORIES:Meeting After the Meeting
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/06/Meeting6.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20210211
DTEND;VALUE=DATE:20210212
DTSTAMP:20260409T105405
CREATED:20201128T195820Z
LAST-MODIFIED:20201128T195820Z
UID:10001052-1613001600-1613087999@www.ocastronomers.org
SUMMARY:New Moon
DESCRIPTION:Views: 2
URL:https://www.ocastronomers.org/calendar/new-moon-21/
CATEGORIES:Moon Phases
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/moon_new.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210205T193000
DTEND;TZID=America/Los_Angeles:20210205T213000
DTSTAMP:20260409T105405
CREATED:20201016T192857Z
LAST-MODIFIED:20210127T223957Z
UID:10001034-1612553400-1612560600@www.ocastronomers.org
SUMMARY:Online Beginner's Class
DESCRIPTION:RSVP using the zoom.us link on the box above.\nPlease install/update zoom client prior to the event. \nThis is the “How to Use Your Telescope” session of the Beginners Astronomy Class. If you have a telescope and would like some help learning to set it up and use it\, attend this on-line  class. \nFor details\, please visit here. \nFree and open to the public as well as members of OCA. \nViews: 2
URL:https://www.ocastronomers.org/calendar/beginners-class-2021-02/
LOCATION:Online
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/02/What-Does-a-Star-Look-Like-Through-a-Telescope.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20210204
DTEND;VALUE=DATE:20210205
DTSTAMP:20260409T105405
CREATED:20201128T195727Z
LAST-MODIFIED:20201128T195727Z
UID:10001051-1612396800-1612483199@www.ocastronomers.org
SUMMARY:Last Quarter Moon
DESCRIPTION:Views: 2
URL:https://www.ocastronomers.org/calendar/last-quarter-moon-3/
CATEGORIES:Moon Phases
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/moon_3rd-quarter.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20210128
DTEND;VALUE=DATE:20210129
DTSTAMP:20260409T105405
CREATED:20201125T223220Z
LAST-MODIFIED:20201206T200858Z
UID:10001049-1611792000-1611878399@www.ocastronomers.org
SUMMARY:Full Moon
DESCRIPTION:The first full moon of the year is colloquially known as Wolf Moon in many northern cultures. A Full Moon occurs when the Sun and the Moon are on opposite sides of the Earth. \nViews: 2
URL:https://www.ocastronomers.org/calendar/full-moon-20/
CATEGORIES:Moon Phases
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/moon_full.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20210120
DTEND;VALUE=DATE:20210121
DTSTAMP:20260409T105405
CREATED:20201125T223141Z
LAST-MODIFIED:20201125T223616Z
UID:10001048-1611100800-1611187199@www.ocastronomers.org
SUMMARY:First Quarter Moon
DESCRIPTION:Views: 2
URL:https://www.ocastronomers.org/calendar/first-quarter-moon-2/
CATEGORIES:Moon Phases
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/moon_1st-quarter.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210115T203000
DTEND;TZID=America/Los_Angeles:20210115T220000
DTSTAMP:20260409T105405
CREATED:20201010T212209Z
LAST-MODIFIED:20210107T180754Z
UID:10001031-1610742600-1610748000@www.ocastronomers.org
SUMMARY:Online Ventura County Astronomical Society's General Meeting
DESCRIPTION:This is an online event held by OCA for VCAS.\nNo prior registration is required but when entering the webinar\, zoom will ask for your name and email.\nAt the time of the meeting\, to attend via zoom app click here\, via your browser click here.\nTo install the zoom app click here.\n \n  \nViews: 2
URL:https://www.ocastronomers.org/calendar/vcas-general-meeting-january-2021/
LOCATION:Online
CATEGORIES:General Meetings,Non OCA Event
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20210112
DTEND;VALUE=DATE:20210113
DTSTAMP:20260409T105405
CREATED:20201125T223052Z
LAST-MODIFIED:20201125T223549Z
UID:10001047-1610409600-1610495999@www.ocastronomers.org
SUMMARY:New Moon
DESCRIPTION:Views: 2
URL:https://www.ocastronomers.org/calendar/new-moon-20/
CATEGORIES:Moon Phases
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/moon_new.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210109T220000
DTEND;TZID=America/Los_Angeles:20210109T233000
DTSTAMP:20260409T105405
CREATED:20201117T100607Z
LAST-MODIFIED:20201117T100607Z
UID:10001038-1610229600-1610235000@www.ocastronomers.org
SUMMARY:Open Spiral Bar
DESCRIPTION:This event is free and open to public\, to attend please register using the zoom.us link on the box above. \nCome and socialize with your fellow astronomy enthusiasts face-to-face virtually!\nBring your latest astrophotos\, mini-presentation\, questions or none and your own refreshments. \n \nViews: 2
URL:https://www.ocastronomers.org/calendar/open-spiral-bar-january-2021/
LOCATION:Online
CATEGORIES:Meeting After the Meeting
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/06/Meeting6.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210108T193000
DTEND;TZID=America/Los_Angeles:20210108T213000
DTSTAMP:20260409T105405
CREATED:20201128T230355Z
LAST-MODIFIED:20201128T230355Z
UID:10001055-1610134200-1610141400@www.ocastronomers.org
SUMMARY:Online General Meeting - January 2021
DESCRIPTION:This is an online event\, to attend please register with zoom using the link on the box above. \nDark Matter and the Dance of Dwarf Galaxies\n \nMajor galaxies\, such as our cosmic home the Milky Way\, the nearby Andromeda galaxy\, or Centaurus A\, are surrounded by swarms of smaller dwarf satellite galaxies. Over the past 15 years\, our knowledge of these satellite galaxies has exploded. The number of known Milky Way satellites has quadrupled\, and highly precise measurements of their motions have provided unprecedented insights into their complex orbital dance. In my research\, I investigate the distribution and motion of satellite galaxies to test our ideas of how the cosmos in general\, and galaxies in particular\, have formed and evolved. Our current leading model of cosmology was largely developed on cosmic scales\, and implies that most of the mass in the Universe is dominated by unknown stuff: Dark Matter. Based on this cosmological model\, computer simulations can nowadays follow the emergence and evolution of structure in model universes. These simulations predict the distribution and properties of galaxies down to the smallest scales (astronomically speaking). They predict a highly chaotic tangle of satellite galaxies. In contrast\, my research finds that the observed situation resembles an ordered choreography: the satellite galaxies around the Milky Way\, Andromeda\, and Centaurus A are aligned along planes. Many satellites also move along these structures in a common direction. This finding poses a serious challenge to our model of cosmology – and might point at a fundamental misinterpretation of cosmic proportions. \nMarcel S. Pawlowski\n \nMy research is situated at the intersection of observations and cosmological simulations. I am most interested in testing our cosmological knowledge and our understanding of the properties and dynamics of dwarf galaxies with observations of nearby systems of satellite galaxies. After receiving my PhD from the University of Bonn in 2013\, I moved to the United States for a postdoc position at Case Western Reserve University in Cleveland\, Ohio. In 2016\, I was awarded a NASA Hubble Fellowship to work at the University of California Irvine. At the end of 2018 I moved back to Germany to my current position as Schwarzschild Fellow at the Leibniz-Institute for Astrophysics in Potsdam. \nViews: 2
URL:https://www.ocastronomers.org/calendar/general-meeting-january-2021/
LOCATION:Online
CATEGORIES:General Meetings
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20210106
DTEND;VALUE=DATE:20210107
DTSTAMP:20260409T105405
CREATED:20201125T222914Z
LAST-MODIFIED:20201125T223510Z
UID:10001046-1609891200-1609977599@www.ocastronomers.org
SUMMARY:Last Quarter Moon
DESCRIPTION:Views: 2
URL:https://www.ocastronomers.org/calendar/last-quarter-moon-2/
CATEGORIES:Moon Phases
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/moon_3rd-quarter.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210102T053000
DTEND;TZID=America/Los_Angeles:20210102T054000
DTSTAMP:20260409T105405
CREATED:20201206T200040Z
LAST-MODIFIED:20201206T200040Z
UID:10001060-1609565400-1609566000@www.ocastronomers.org
SUMMARY:Earth's Perihelion
DESCRIPTION:At 5:30am\, the Earth will reach its perihelion—the point on its orbit that is closest to the Sun. \nViews: 2
URL:https://www.ocastronomers.org/calendar/earths-perihelion/
CATEGORIES:Celestial Events
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20210102
DTEND;VALUE=DATE:20210104
DTSTAMP:20260409T105405
CREATED:20201125T223438Z
LAST-MODIFIED:20201125T224040Z
UID:10001050-1609545600-1609718399@www.ocastronomers.org
SUMMARY:Quadrantids Meteor Shower
DESCRIPTION:The Quadrantids is an above average shower\, with up to 40 meteors per hour at its peak. It is thought to be produced by dust grains left behind by an extinct comet known as 2003 EH1\, which was discovered in 2003 \nViews: 2
URL:https://www.ocastronomers.org/calendar/quadrantids-meteor-shower/
CATEGORIES:Meteor Showers
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/Meteor-Showers.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210101T193000
DTEND;TZID=America/Los_Angeles:20210101T213000
DTSTAMP:20260409T105405
CREATED:20201202T192951Z
LAST-MODIFIED:20201202T194530Z
UID:10001056-1609529400-1609536600@www.ocastronomers.org
SUMMARY:Online Beginner's Class
DESCRIPTION:This event is free and open to public; to attend please register using the zoom.us link on the box above. \nThis session of the Beginners Astronomy Class covers the science behind the telescope. \nHow do our eyes actually perceive objects we see in the telescope and what is the physics that allows that perception. \nFor details\, please visit here and download the sample information PDF package. \nViews: 2
URL:https://www.ocastronomers.org/calendar/beginners-class-17/
LOCATION:Online
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20201230T190000
DTEND;TZID=America/Los_Angeles:20201230T193000
DTSTAMP:20260409T105405
CREATED:20201229T015710Z
LAST-MODIFIED:20201229T015710Z
UID:10001063-1609354800-1609356600@www.ocastronomers.org
SUMMARY:2020 Blair Award Ceremony
DESCRIPTION:Topic: WAA G. Bruce Blair Award\nTime: Dec 30\, 2020 07:00 PM Pacific Time (US and Canada) \nJoin Zoom Meeting\nhttps://us02web.zoom.us/j/84876958189?pwd=MWZBclU3WE1kRGdjL3M4MXZ6bVVtZz09 \n  \nAn astronomy enthusiast since childhood\, Bing F. Quock joined Morrison Planetarium’s staff in 1973 and joined the Planetarium Lecturer team in 1975\, presenting live shows using the classic Academy-made star projector. In the late ’70s\, he taught several semesters of Introductory Astronomy at one of City College of San Francisco’s satellite campuses under Don Warren\, then the head of CCSF’s Astronomy Department. From 1982-2003\, he served as Morrison Planetarium’s Assistant Chairman and Show Producer\, writing and producing approximately 110 planetarium shows for the public\, school\, and special event audiences during that time\, as well as teaching informal astronomy classes and guiding observing sessions for Academy members and youth. During this period\, he wrote the “Skywatcher’s Guide” that appeared regularly in the Academy’s quarterly magazine and which continues today\, still authored by him\, in digital form on the museum’s website (www.calacademy.org). He also created the Academy’s popular “Pocket Almanac\,” and since the ’80s has written daily skywatching snippets under the Planetarium’s byline for syndication to about 30 newspapers around the country. He has been a frequent interviewee on Bay Area radio and television\, explaining eclipses\, meteor showers\, and other astronomical phenomena.   \n  \nFrom the mid-1990s to 2017\, he assisted Ron Dammann as one of the principal operators of the Hume Observatory at Pepperwood Preserve in Sonoma\, educating and entertaining small groups of visitors with views of the night sky through the facility’s instruments\, which included a 6.4″ Alvan Clark refractor once owned by George Davidson and “Edelweiss\,” a 17″ Dobsonian reflector donated by Doug Berger. Although the observatory and its equipment did not survive the Tubbs wildfire of 2017\, Bing continues guiding occasional skywatching sessions as part of Pepperwood Preserve’s educational program. \n  \nFrom 2004-2006\, he served as Acting Director of Morrison Planetarium when the Academy of Sciences temporarily relocated to downtown San Francisco\, while the Academy buildings were renovated. He performed astronomy outreach to schools with an inflatable planetarium until\nthe new Academy reopened in the Park. Since 2007\, he has held the position of Morrison Planetarium’s Assistant Chairman and presently continues concentrating on outreach\, partnerships\, and astronomy communication to the media. \nViews: 2
URL:https://www.ocastronomers.org/calendar/2020-blair-award-ceremony/
CATEGORIES:Award Ceremony,Non OCA Event
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20201229
DTEND;VALUE=DATE:20201230
DTSTAMP:20260409T105405
CREATED:20201123T191919Z
LAST-MODIFIED:20201123T221017Z
UID:10001042-1609200000-1609286399@www.ocastronomers.org
SUMMARY:Full Moon
DESCRIPTION:Views: 2
URL:https://www.ocastronomers.org/calendar/full-moon-14/
CATEGORIES:Moon Phases
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/moon_full.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20201221T170000
DTEND;TZID=America/Los_Angeles:20201221T171500
DTSTAMP:20260409T105405
CREATED:20201205T001526Z
LAST-MODIFIED:20201205T001526Z
UID:10001058-1608570000-1608570900@www.ocastronomers.org
SUMMARY:First "Christmas Star" in 800 years
DESCRIPTION:This December 21st\, on the winter solstice\, Jupiter and Saturn will be their “closest” in 800 years.  Not since the Middle Ages has this close encounter between these two planets occurred.  The event will occur 45 minutes after sunset in the southwest and will result in a spectacular view!  Get out your cameras!! \nViews: 2
URL:https://www.ocastronomers.org/calendar/first-christmas-star-in-800-years/
CATEGORIES:Celestial Events
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20201221
DTEND;VALUE=DATE:20201223
DTSTAMP:20260409T105405
CREATED:20201206T200302Z
LAST-MODIFIED:20201206T200302Z
UID:10001061-1608508800-1608681599@www.ocastronomers.org
SUMMARY:Ursids Meteor Shower
DESCRIPTION:Catch the shooting stars of the last major meteor shower of the year\, the Ursids\, when it peaks between the night of December 21 and 22\, 2020. \nViews: 2
URL:https://www.ocastronomers.org/calendar/ursids-meteor-shower/
CATEGORIES:Meteor Showers
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/Meteor-Showers.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20201221
DTEND;VALUE=DATE:20201222
DTSTAMP:20260409T105405
CREATED:20201205T001150Z
LAST-MODIFIED:20201205T001150Z
UID:10001057-1608508800-1608595199@www.ocastronomers.org
SUMMARY:Winter Solstice
DESCRIPTION:Views: 2
URL:https://www.ocastronomers.org/calendar/winter-solstice-2/
CATEGORIES:Celestial Events
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20201221
DTEND;VALUE=DATE:20201222
DTSTAMP:20260409T105405
CREATED:20201123T191819Z
LAST-MODIFIED:20201123T220948Z
UID:10001041-1608508800-1608595199@www.ocastronomers.org
SUMMARY:First Quarter Moon
DESCRIPTION:Views: 2
URL:https://www.ocastronomers.org/calendar/first-quarter-moon/
CATEGORIES:Moon Phases
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/moon_1st-quarter.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20201214T063000
DTEND;TZID=America/Los_Angeles:20201214T213000
DTSTAMP:20260409T105405
CREATED:20201211T194016Z
LAST-MODIFIED:20201211T194632Z
UID:10001062-1607927400-1607981400@www.ocastronomers.org
SUMMARY:Online Solar Eclipse
DESCRIPTION:The last solar eclipse of 2020 will be on Monday December 14th and is going to be only visible from Southern America. \nBehold that OCA in collaboration with Prof. Elizabeth Villanueva and her students from Colegio Alberto Pérez has arranged for an international live broadcast of the event. \nThe program will be held from the start of the eclipse at 6:30am PST up until its end at 9:30am PST. In addition to the Chilean view of the sun\, there will be short presentations by students and teacher from all around the world. \nTo attend\, have zoom installed and then visit the page below at the appropriate time. \nhttps://www.astrozoom.space/attend \n \nViews: 2
URL:https://www.ocastronomers.org/calendar/online-solar-eclipse-2020/
LOCATION:Online
CATEGORIES:Celestial Events,Outreach,Star Parties
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/12/Eclipse_Chile_PST.jpeg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20201214
DTEND;VALUE=DATE:20201215
DTSTAMP:20260409T105405
CREATED:20201123T191710Z
LAST-MODIFIED:20201201T124742Z
UID:10001040-1607904000-1607990399@www.ocastronomers.org
SUMMARY:New Moon
DESCRIPTION:Views: 2
URL:https://www.ocastronomers.org/calendar/new-moon-19/
CATEGORIES:Moon Phases
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/moon_new.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20201213
DTEND;VALUE=DATE:20201214
DTSTAMP:20260409T105405
CREATED:20201123T231405Z
LAST-MODIFIED:20201201T124612Z
UID:10001044-1607817600-1607903999@www.ocastronomers.org
SUMMARY:Geminid Meteor Shower
DESCRIPTION:Views: 2
URL:https://www.ocastronomers.org/calendar/geminid-meteor-shower-2020/
CATEGORIES:Meteor Showers
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/Meteor-Showers.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20201212T220000
DTEND;TZID=America/Los_Angeles:20201212T233000
DTSTAMP:20260409T105405
CREATED:20201010T212352Z
LAST-MODIFIED:20201010T212419Z
UID:10001032-1607810400-1607815800@www.ocastronomers.org
SUMMARY:Open Spiral Bar
DESCRIPTION:This event is free and open to public\, to attend please register using the zoom.us link on the box above. \nCome and socialize with your fellow astronomy enthusiasts face-to-face virtually!\nBring your latest astrophotos\, mini-presentation\, questions or none and your own refreshments. \n \nViews: 2
URL:https://www.ocastronomers.org/calendar/open-spiral-bar-december-2020/
LOCATION:Online
CATEGORIES:Meeting After the Meeting
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/06/Meeting6.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20201211T193000
DTEND;TZID=America/Los_Angeles:20201211T213000
DTSTAMP:20260409T105405
CREATED:20201026T193327Z
LAST-MODIFIED:20201212T100213Z
UID:10001035-1607715000-1607722200@www.ocastronomers.org
SUMMARY:Online General Meeting - December 2020
DESCRIPTION:This is an online event\, to attend please register with zoom using the link on the box above. \nState of the Universe Report\n \nThis lecture will discuss the current understanding and the latest discoveries regarding cosmology—the science of the universe as a whole—and galaxies and planets. There is overwhelming evidence that most of the density of the universe is invisible dark matter and dark energy\, with atomic matter making up only about five percent of cosmic density. UC Santa Cruz cosmologists helped to create the standard modern cosmological theory—but the latest high-precision measurements have revealed potential discrepancies that may require new physics. Galaxies were long thought to start as disks of gas and stars\, but observations by Hubble Space Telescope show that most galaxies instead start pickle-shaped. More massive galaxies have massive black holes at their centers\, and matter falling onto these black holes causes outflows of energy that can strongly affect their host galaxies. Information about planetary systems is growing rapidly with new observations\, and our own solar system seems increasingly to be unusual. \nJoel R. Primack\n \nJoel R. Primack specializes in the formation and evolution of galaxies and the nature of the dark matter that makes up most of the matter in the universe. After helping to create what is now called the “Standard Model” of particle physics\, Primack began working in cosmology in the late 1970s\, and he became a leader in the new field of particle astrophysics. His 1982 paper with Heinz Pagels was the first to propose that a natural candidate for the dark matter is the lightest supersymmetric particle. He is one of the principal originators and developers of the theory of Cold Dark Matter\, which has become the basis for the standard modern picture of structure formation in the universe. With support from the National Science Foundation\, NASA\, and the Department of Energy\, he has been using supercomputers to simulate and visualize the evolution of the universe and the formation of galaxies under various assumptions. \nHere’s the link to a recording of my 10 November 2020 UCSC Emeriti Research Lecture “State of the Universe Report: Cosmos\, Galaxies\, Planets” on YouTube:\nhttps://www.youtube.com/watch?v=BAuiSC0iUXE\n\nHere are some of my recent research results that may be of wider interest:\n\n— Local measurements of the the Hubble parameter give H_0 = 73 ± 1 km/s/Mpc\, while measurements of the Cosmic Microwave Background extrapolated to the present with the standard ΛCDM cosmology give H_0 = 67 ± 0.5 km/s/Mpc.  This “Hubble tension” could be resolved if there was a brief period when dark energy contributed about 10% to the cosmic density about 35\,000 years after the Big Bang.  I initiated the first N-body simulations with this Early Dark Energy (EDE) cosmology.  Our paper on this https://arxiv.org/pdf/2006.14910.pdf was led by Anatoly Klypin.  We found that EDE predicts 50% more rich clusters of galaxies at redshift z=1 than standard ΛCDM\, and many more galaxies at higher redshifts.  These predictions will be tested by new astronomical surveys now underway. We are resubmitting the paper to MNRAS in response to a favorable referee report\, so it will be published soon.  We are setting up to run 500 Mpc/h paired simulations with Bolshoi resolution of standard ΛCDM and EDE; the use of the same random number seed will ensure that all the large-scale structures will correspond in these simulations.  We plan to do abundance matching with both simulations\, to fill all the halos with UniverseMachine and Santa Cruz SAM galaxies\, and to compare with observations.\n\n— I initiated a paper that shows that Earth may be a “Goldilocks” planet in a new way\, with enough radioactive heat generation to power plate tectonics and not too much to kill the geodynamo generating the Earth’s magnetic field.  Tectonics and a magnetic field may both be necessary for the evolution of complex life.  Earth’s radioactive heat is generated by the two longest-lived radioactive elements thorium and uranium\, which are produced in extremely rare events such as neutron-star mergers — as a result\, the amount of Th and U varies a lot between different planetary systems.  Our paper\, led by my UCSC colleague Francis Nimmo\, was published November 10\n https://ui.adsabs.harvard.edu/abs/2020ApJ…903L..37N\nThe UCSC press release is at https://news.ucsc.edu/2020/11/planet-dynamos.html \,\nwith some popular articles at\nhttps://astrobiology.nasa.gov/news/how-radioactivite-elements-may-make-planets-suitable-or-hostile-to-life/\nhttps://www.scientificamerican.com/article/stellar-smashups-may-fuel-planetary-habitability-study-suggests/\nhttps://cosmoquest.org/x/2020/11/radioactive-elements-may-be-crucial-to-rocky-planets-habitability/\nhttps://www.centauri-dreams.org/2020/11/13/radioactive-elements-and-planetary-habitability/\nhttps://astrobites.org/2020/11/17/radiogenic-heat-hurts-dynamos/\nhttps://www.universetoday.com/148796/what-role-do-radioactive-elements-play-in-a-planets-habitability/\n\n— I’ve continued to make novel uses of machine learning to compare simulations with observations and to analyze observations.  My group’s latest papers on this focused on giant clumps found in HST images of most redshift z > 1 star-forming galaxies.  In https://ui.adsabs.harvard.edu/abs/2020MNRAS.499..814H we trained a CNN to measure the masses of giant clumps; we made public our analysis of the entire CANDELS galaxy dataset\, and we used a complete set from GOODS-N and S with 7 wavebands to measure clump properties as functions of galaxy properties including sSFR\, radius\, and stellar mass.  In https://ui.adsabs.harvard.edu/abs/2020arXiv201106616G we trained a CNN to measure the lifetimes of the clumps in the CANDELS data; this paper was just accepted for publication.  Our earlier paper that made extensive use of machine learning to compare HST observations with theory was profiled in https://news.ucsc.edu/2018/04/deep-learning-galaxies.html \n\n\nViews: 2
URL:https://www.ocastronomers.org/calendar/general-meeting-december-2020/
LOCATION:Online
CATEGORIES:General Meetings
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20201207
DTEND;VALUE=DATE:20201208
DTSTAMP:20260409T105405
CREATED:20201123T191600Z
LAST-MODIFIED:20201123T220849Z
UID:10001039-1607299200-1607385599@www.ocastronomers.org
SUMMARY:Last Quarter Moon
DESCRIPTION:Views: 2
URL:https://www.ocastronomers.org/calendar/last-quarter-moon/
CATEGORIES:Moon Phases
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/moon_3rd-quarter.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20201206T080000
DTEND;TZID=America/Los_Angeles:20201206T170000
DTSTAMP:20260409T105405
CREATED:20201206T195650Z
LAST-MODIFIED:20201206T195650Z
UID:10001059-1607241600-1607274000@www.ocastronomers.org
SUMMARY:Ursid Meteors
DESCRIPTION:Catch the shooting stars of the last major meteor shower of the year\, the Ursids\, when it peaks between the night of December 21 and 22\, 2020. \nViews: 2
URL:https://www.ocastronomers.org/calendar/ursid-meteors/
CATEGORIES:Meteor Showers
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/Meteor-Showers.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20201204T193000
DTEND;TZID=America/Los_Angeles:20201204T213000
DTSTAMP:20260409T105405
CREATED:20201016T192330Z
LAST-MODIFIED:20201127T224928Z
UID:10001033-1607110200-1607117400@www.ocastronomers.org
SUMMARY:Online Beginner's Class
DESCRIPTION:This event is free and open to public; to attend please register using the zoom.us link on the box above. \nThe 6th session of the Beginners Astronomy Class covers the basics of astrophotography\, covering different types of imaging\, how different types of cameras are used for this kind of photography\, and other equipment and considerations for taking a good picture.\nThis session is taught by Kyle Coker\, who is active in the club’s AstroImaging special interest group. \nFree and open to the public as well as members of OCA. \nViews: 2
URL:https://www.ocastronomers.org/calendar/beginners-class-december-2020/
LOCATION:Online
CATEGORIES:Beginner's Class
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20201130
DTEND;VALUE=DATE:20201201
DTSTAMP:20260409T105405
CREATED:20201123T220807Z
LAST-MODIFIED:20201123T221040Z
UID:10001043-1606694400-1606780799@www.ocastronomers.org
SUMMARY:Full Moon
DESCRIPTION:Views: 2
URL:https://www.ocastronomers.org/calendar/full-moon-19/
CATEGORIES:Moon Phases
ATTACH;FMTTYPE=image/jpeg:https://www.ocastronomers.org/wp-content/uploads/2020/11/moon_full.jpg
END:VEVENT
END:VCALENDAR