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August Meetings Comet NEOWISE C/2020 F3 July, 2020 August MeetingsJuly, 2020 The Milwaukee Astronomical Society is on the summer schedule. There will be no Membership Meetings in the summer months of June, July, and August. However, there will be a Board Meeting on August 10th, the second Monday of the month starting at 7PM. Due to the COVID-19 pandemic the meeting will be held through Zoom videocon- ference. The Board Meetings are open to the membership and everybody is welcome to attend who is interested in organizational and Observatory related issues. If you are not Inside this issue: a Board member but would like to attend please contact Tamas Kriska. The Astrophotography Focus Group will meet on Wednesday, August 12th at 7 PM August Meetings 1 trough Zoom videoconference. The specific topic of the meeting will be announced on the Google Group. Comet Neowise 1 The First Wednesday How to Meeting will also be held through Zoom videoconfer- st Minutes 2 ence on August 5 , from 7:30 PM. The MAS Google Group is as active as ever. Learn about the astronomical news, fol- Treasurer Report 2 low equipment related discussions, or just check out the latest images taken by fellow Observatory Direc- 2 Club members. tor Report Membership 2 Comet NEOWISE C/2020 F3 Comet NEOWISE 3 In the News 5 This month we had an Adopt a Scope 6 unexpected celestial visi- tor, the brightest comet Officers/Staff 6 in the northern hemi- Keyholders 6 sphere since Comet Hale –Bopp in 1997. The C/2020 F3, a long period comet with a near- parabolic orbit was dis- covered on March 27 during the NEOWISE mission of the Wide-field Infrared Survey Explorer (WISE) space telescope. On July 3, the comet emerged from perihelion around magnitude 1, making it bright enough By Tomruen - computed with my own software, FullSky Ob- to be visible to the naked servatory, using trajectories from JPL Horizons. eye. NASA's Parker Solar Probe had captured an image of the comet, from which the diameter of the nucleus was estimated at approximately 5 km (3 mi). This passage increased the comet's orbital pe- riod from about 4400 years to about 6700 years. It was widely photographed by amateur observers including many MAS members. Despite the difficulties of processing the data many beautiful widefield and close up photos were shared on the Google Group. A collection of them can be found on page 3 and 4 of this issue. It was a real treat to see and photograph this comet. Page 2 Observatory Director Report Minutes The new steps are in for the entrance into A- Due to the COVID-19 outbreak the Board Building and they look great. Sod has been plant- meeting was held on July 13st via Zoom videocon- ed around the steps and thanks goes out to Lee ference and was called to order at 7:02PM by Ta- Keith for keeping up on the watering. mas Kriska President. The following Board Mem- Pieces of equipment from the large donation bers were present: Jim Bakic, Mike Bauer, Paul made several months ago are being tested, Borchardt, Clark Brizendine, Jason Doyle, Lee cleaned up, and made ready for sale. Members Keith, Jeff Kraehnke, Dennis Roscoe, Gabe will have the first chance to purchase items be- Shaughnessy, Jim Schroeter, Sue Timlin, Mike fore they are listed on the internet. Wagner, and Agnes Keszler. Gene Hanson I’d like to thank the keyholders for their extra (Founding Memeber), Randy Culp, and Russ help in getting the Observatory open for the members. Keep up the good work and stay safe Blankenburg were also present. doing it. Minutes, and Treasurer's Report electronically Respectfully Submitted, submitted ahead of the meeting were approved. Paul Borchardt, Observatory Director Observatory Director's Report electronically submitted ahead of the meeting was amended and approved. Amendment: The water pressure Treasurer’s Report tank has broken due to the winter frost. It has been repaired in May. For the future heating tape $10,327.50 Starting Balance as of 06/06/2020 should be installed. Expenditures Membership Committee Report was electroni- cally ahead of the meeting. Membership applica- $2.31 PayPal fees tions of Mitzi Keadle, Elizabeth Haase, and Guine- $820.00 Insurance premium vere Hicks were approved. $541.95 Quonset new stairs Old Business – Public Nights: Due to the COVID- $73.75 Other expenses 19 situation all Public Nights are cancelled for this $55.88 WE Energies year. Concrete step installation: Paul Borchardt will fol- $36.00 Water/Sewer low up for the back-door concrete slab pouring. $1,529.89 TOTAL Expenditures Will ask for price. He is also working on the PVC Revenue box around the hydrant. $70.25 Private donations Front garage reroofing: Jeff Kraehnke received a $146.00 Membership dues quote of $2490. A motion was made and carried to $57.00 Astronomical League accept the quote and allocate $3000 for the re- $4.00 Grants roofing project. Trees should be trimmed or re- $277.25 TOTAL Revenue moved prior the work. Entrance gate: Jeff suggested to install a pair of $9,074.25 Ending Balance as of 07/11/2020 drive way gate (DoMyOwn $128/piece). A motion Respectfully Submitted, was made and carried to allocate $500 for this Sue Timlin, Treasurer project. New Business – No new business. Membership Report Announcement – The next meeting will be on Monday, August 10th, 2020 via Zoom videoconfer- Since the last Report we received 5 new ap- ence. plications. We welcome Elizabeth Haase, Ian Respectfully Submitted, Thomson & Mike Leach, Francisco Lopez Ortiz, Agnes Keszler, Secretary Dawne Zaffke & Family, and Dawn McElrone & Family. The total number of active members is 176. Respectfully Submitted, Jeff Kraehnke, Committee Chair Page 3 Comet NEOWISE Dennis Horvath Tamas Kriska Arun Hegde John Asztalos Chad Andrist Nolan Zadra Jeff Kraehnke Jim Bakic Page 4 Comet NEOWISE Arun Hegde Dennis Horvath Gabe Shaughnessy Joe Wilcox John Asztalos Girish Muralidharan Chad Andrist Jeff Kraehnke Page 5 In the Astronomical News Astronomers Discover South Pole Wall, a Gigantic Structure Stretching 1.4 Billion Light-years Across Spectacular 3D maps of the universe have re- peculiar velocity of galaxies. This measurement vealed one of the biggest cosmic structures ever includes redshift but also takes into account the found — an almost-inconceivable wall stretching motion of galaxies around one another as they 1.4 billion light-years across that contains hun- tug at each other gravitationally, Pomarede dreds of thousands of galaxies. The South Pole said. The advantage of the method is that it can Wall, as it's been dubbed, has been hiding in detect hidden mass that is gravitationally influ- plain sight, remaining undetected until now be- encing how galaxies move and therefore uncover cause large parts of it sit half a billion light-years dark matter, that invisible stuff that emits no light away behind the bright Milky Way galaxy. The but exerts a gravitational tug on anything near South Pole Wall rivals in size the Sloan Great Wall, enough. By running algorithms looking at peculi- the sixth largest cosmic structure discovered. ar motion in galactic catalogs, the team was able Astronomers have long noticed that galaxies to plot the three-dimensional distribution of mat- are not scattered randomly throughout the uni- ter in and around the Zone of Galactic Obscura- verse but rather clump together in what's known tion. as the cosmic The result- web, enormous ing map shows strands of hy- a mind- drogen gas in boggling bub- which galaxies ble of material are strung like more or less pearls on a centered on necklace that the southern- surround gi- most point of gantic and the sky, with a largely empty great sweeping voids. Mapping wing extending these interga- north on one lactic threads side in the di- belongs to the rection of the field of cos- constellation mography, An all-sky map zoomed in on the South Pole, showing dust only. In this view, Cetus and an- the South Pole Wall is not visible, though it is near the Chamaeleon complex. which is "the other stubbier The bright line ringing shows the Zone of Galactic Obscuration. Credit: D. cartography of arm opposite it Pomarede, R. B. Tully, R. Graziani, H. Courtois, Y. Hoffman, J. Lezmy. the cosmos," in the direction study researcher of the constel- Daniel Pomarede, a cosmographer at Paris-Saclay lation Apus. Knowing how the universe looks on University in France, told Live Science. In 2014, such large scales helps confirm our current cos- Pomarede and his colleagues unveiled the mological models, Neta Bahcall, an astrophysicist Laniakea supercluster, a galactic collection in at Princeton University in New Jersey who was which our own Milky Way resides. Lanaikea is 520 not involved in the work, told Live Science. But million light-years wide and contains roughly the determining where exactly these enormous, mass of 100 million billion suns. For their new crisscrossing structures begin and end is tricky, map, the team used newly-created sky surveys to she added. "When you look at the network of fila- peer into a region called the Zone of Galactic Ob- ments and voids, it becomes a semantic question scuration. This is an area in the southern part of of what's connected," she said. the sky in which the bright light of the Milky Way The team acknowledges that they may not blocks out much of what's behind and around it. have plotted yet the entirety of the vast South Cosmographers typically determine the dis- Pole Wall. "We will not be certain of its full ex- tance to objects using redshift, the speed at which tent, nor whether it is unusual, until we map the an object is receding from Earth due to the expan- universe on a significantly grander scale," they sion of the universe, which depends on their dis- wrote.
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