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SIAC Newsletter April 2015 April 2015 The Sidereal Times Southeastern Iowa Astronomy Club A Member Society of the Astronomical League Club Officers: Minutes March 19, 2015 Executive Committee President Jim Hilkin Vice President Libby published, Bill seconded, ship. Payment can be Vice President Libby Snipes Treasurer Vicki Philabaum Snipes called the meeng and the moon passed. made at a club meeng Secretary David Philabaum Chief Observer David Philabaum to order at 6:33 pm with Vicki gave the Treasurer's or by mailing them to PO Members-at-Large Claus Benninghoven the following members in report stang that the Box 14, West Burlington, Duane Gerling Blake Stumpf aendance: Carl Snipes , current balance in the IA 52655. John moved to Board of Directors Paul Sly, Chuck Block, checking account is approve the Treasurer's Chair Judy Hilkin Vice Chair Ray Reineke Claus Benninghoven, $1,914.04. She also stat- report, seconded by Secretary David Philabaum Members-at-Large Duane Gerling, Bill Stew- ed that she will be send- Chuck, and the moon Frank Libe Blake Stumpf art, Ray Reineke, John ing out noces reminding passed. Dave reported Jim Wilt Toney, and Dave & Vicki people when it is me to that the only groups on Audit Committee Dean Moberg (2012) Philabaum. Lavon Worley renew their member- the schedule at this me JT Stumpf (2013) John Toney (2014) from the conservaon ships. Dues remain $20 are the county Dark Newsletter board was also in aend- per year for a single Wings camps this sum- Karen Johnson ance. John moved to ap- membership and $30 per mer. Libby reported that prove the minutes as year for a family member- she had been contacted (continued on page 3) Inside this issue: Space Place 2 FYI Minutes (cont.) 3 ~ Dues are due in ~ Election of officers ~ Deadline for articles Looking Back 4 April~ $20 single, $30 will take place at the for the May newsletter family May meeting is May 6th Treasurer’s Report 4 ~ Nominations for of- ~ April meeting is on Observer’s Report 5-6 ficers will take place at the 17th at the Witte the April meeting Observatory Calendar 7 Sky Maps 8-9 Page 2 The Sidereal Times The Cold Never Bothered Me Anyway By Dr. Ethan Siegel For those of us in the and atomic nuclei like pro- al Exploration (IMAGE) northern hemisphere, win- tons and alpha particles— satellite (which ceased op- ter brings long, cold make up the vast majority erations in December nights, which are often ex- of the solar wind and get 2005) was able to find out cellent for sky watchers funneled by the Earth's how the magnetosphere (so long as there's a way to magnetic field into a circle responded to solar wind keep warm!) But there's around its magnetic poles. changes, how the plasmas often an added bonus that They're energetic enough were energized, transport- comes along when condi- to knock electrons off at- ed and (in some cases) tions are just right: the po- oms and molecules at vari- lost, and many more prop- lar lights, or the Aurora ous layers in the upper at- erties of our magneto- Borealis around the North mosphere—particles like sphere. Planets without Pole. Here on our world, a molecular nitrogen, oxy- significant magnetic fields brilliant green light often gen and atomic hydrogen. such as Venus and Mars appears for observers at And when the electrons have much smaller, weaker high northern latitudes, fall back either onto the aurorae than we do, and with occasional, dimmer atoms or to lower energy gas giant planets like Sat- reds and even blues light- levels, they emit light of urn have aurorae that pri- ing up a clear night. varying but particular marily shine in the ultravi- wavelengths—oxygen pro- olet rather than the visible. “They’re ener- We had always assumed ducing the most common Nevertheless, the aurorae gec enough to that there was some con- green signature, with less are a spectacular sight in nection between particles common states of oxygen the evening, particularly knock electrons emitted from the Sun and and hydrogen producing for observers in Alaska, off atoms and the aurorae, as particularly red and the occasional blue Canada and the Scandina- molecules…” intense displays were ob- from nitrogen. vian countries. But when a served around three days solar storm comes our after a solar storm oc- But it wasn't until the way, keep your eyes to- curred in the direction of 2000s that this picture was wards the north at night; Earth. Presumably, parti- directly confirmed! the views will be well cles originating from the NASA's Imager for Mag- worth braving the cold! Sun—ionized electrons netopause-to-Aurora Glob- Auroral overlays from the IMAGE spacecraft. Image credit: NASA Earth Observatory (Goddard Space Flight Center) / Blue Marble team. AprilNovember 2015 2013 Page 3 Minutes (continued from page 1) about the club having the ons will be at the May moved to adjourn, Vicki observatory open for the meeng. Most current seconded, and the Youth Jamboree to be office holders cannot run meeng adjourned at held on Saturday, May 9 th for another term in their 7:10 pm. Following the from 9:00am - 2:00pm. It current posion. She en- meeng Libby showed was decided that the club couraged everyone to some of the images she would have the observa- consider serving on the has recently taken. tory open for the event. board. Future dates for Ray reported that he is acvies were discussed. Respecully submied, working on the end plates The next club meeng Dave Philabaum for the Ealing scope to will be at the observatory Did You Know? enclose the new clutch on April 17 th at 7:00 pm. motors and the encoders Also the first and third Hans Lipperhey is for the ArgoNavis system. Friday night viewing ses- credited with in- Libby reminded everyone sions have resumed. Dave venng the first tel- that nominaons for club gave the Observer’s re- escope. He was a offices will be held at the port. With no other busi- German spectacle April meeng and elec- ness to discuss Ray maker who applied for the patent on September 25, 1608 Jim Hilkin and Jim Wilt removed the remainder of the bushes and stumps on March 31, 2015 Page 4 The Sidereal Times Looking Back in the Sidereal Times 25 Years Ago—April 1990 The latest news is the to be displayed in the class- just over a minute into its plaque dedicated to the Wit- room at the observatory. flight. Shuttle flights ceased te Observatory is now in The launch is scheduled for for two years. On April 24, Huston awaiting final confir- April 12 at 9:21 am CDT. 1990, Hubble finally mation to be included Keep your fingers crossed. launched into orbit aboard aboard the space shuttle (The plaque and a letter the Space Shuttle Discov- Discovery when it transports from NASA stating that it ery. The telescope carried the Hubble Space Tele- was flown on the space five instruments: The Wide scope to its orbit. If you will shuttle are on display in the Field/Planetary Camera, the remember, Dan Carlson classroom. Hubble's launch Goddard High Resolution provided and engraved a was originally scheduled for Spectrograph, the Faint Ob- plaque which, if all goes October 1986. But on Janu- ject Camera, the Faint Ob- well, will journey into space ary 28, 1986, the Space ject Spectrograph, and the and then be returned to us Shuttle Challenger exploded High Speed Photometer.) Looking Back in the Sidereal Times 10 Years Ago—April 2005 Did You Know? The April 2005 newsletter was darker than expected. aerosols that are known to contained a composite im- Evidence of methane drizzle out of Titan's atmos- NASA envisions age of Titan taken by the springs on the surface was phere, indicating that the Cassini spacecraft. Initial also found. (Subsequent surface was mostly dry submarines results from the Huygens results have found that the when Huygens landed. The probe that landed on Titan surface of Titan has the con- Cassini mission had been eventually revealed a complex surface sistency of soft wet sand extended until 2017.) with channels and lakes but with a thin crust on top, exploring Kraken it was not know if there was somewhat like snow with a Mare, a liquid currently any liquid on the crust of ice on top. Huygens surface. The surface con- also kicked up fluffy dust-like methane lake on sisted of mainly dirty water material, most likely organic ice and hydrocarbon ice and Titan. (Source: hp:// www.usatoday.com/story/news/ Treasurer’s Report SIAC Treasurer's Report March 2015 naon-now/2015/02/17/nasa- submarine-explore-saturn-tan- 2/28/2015 Beginning Balance $1,864.98 kraken/23559075/ Deposits 3/9/2015 Dues $80.00 3/30/2015 Dues $90.00 Total Deposits $170.00 Expenses Check Payee 3/13/2015 462 MTC Technologies $30.94 Total Expenses $30.94 3/30/2015 Ending Balance $2,004.04 General Fund $1,843.15 Grants $160.89 Total in Checking Account $2,004.04 April 2015 Page 5 Observer’s Report for April/May Mercury is in Aries just 1/10 as bright as Mer- rature on May 4 th mak- above the western hori- cury. Both planets are ing it a good time to zon 30 minutes after 26° below and slightly watch for eclipses of sunset in mid-April. On right of brilliant Venus. the Galilean moons. On April 19 th look for Mer- Venus is in Taurus April 26 th only Europa cury 6° WSW of the 1.5 shining at magnitude -4 and Ganymede will be day-old crescent Moon in mid-April.
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