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San Jose Astronomical Association Membership Form P.O EPHEMERIS October 2012 SJAA Activities Calendar Messier Half-Marathon Jim Van Nuland Teruo Utsumi October 27 General Meeting. Board meeting Many astronomy enthusiasts have 5 Astronomy Class at Houge Park. at 6:00; Social Time at 7:30; General thought and dreamed about the 7:30 p.m. The topic: Fall Constella- Meeting at 8:00. Our speaker is Dr. Messier Marathon, seeing and bagging tions / Highlight Objects. (out- Dana Backman, NASA, SOFIA. Spe- the 100+ objects over the course of one doors) cific topic to be announced. night. But the prospect is so daunting 5 Houge Park star party. Sunset 6:44 that only the most daring, hardy (and p.m, 70% moon rises 10:18 p.m. November crazy?) people actually attempt it. Star party hours: 7:45 until 10:45 4 DST ends at 2 a.m. Set clocks back For the rest of us, the SJAA is presenting p.m. one hour. an opportunity to save yourself from 6 Imaging SIG. 7:30-9:30 p.m. CCD 4 Observing H-alpha flares and sun- the after-effects of such an all-nighter. Imaging for beginners Special In- spots at Houge Park. Also our Tele- Try your hand at star-hopping your way scope Tune-up Time. Sun party and terest Group meets on the basket- to half of the M objects in the inaugural ball courts at Houge Park. Open to tune-up hours: 2:00 until 4:00 p.m. SJAA Messier Half Marathon. all. 9 Astronomy Class at Houge Park. 7:00 7 Observing H-alpha flares and p.m. The topic: Amateur telescope The event takes place at Henry Coe sunspots at Houge Park. Also our making, why, how and where. State Park’s overflow lot on the evening Telescope Tune-up Time. Sun party 9 Houge Park star party. Sunset 5:02 of 13 October 2012. This is a social, and tune-up hours: 2:00 until 4:00 p.m, 19% moon rises 2:58 a.m. Star newbie friendly event open to beginners p.m. party hours: 7:00 until 10:00 p.m. (with basic skills) through advanced 13 Dark-Sky weekend. Sunset 6:33 10 Dark-Sky weekend. Sunset 5:01 p.m, observers. The goal is to find roughly 50 p.m, no moon. Henry Coe Park’s 10% moon rises 4:07 a.m. Messier Objects in four hours. Running “Astronomy” lot has been reserved. 17 Dark-Sky weekend. Sunset 4:56 p.m, shoes and the 13.1 mile run are optional. 24% moon sets 9:12 p.m. Henry Coe See article on Messier Half-Mara- Detailed guidelines, including an object/ thon on page 1. Park’s “Astronomy” lot has been target list, are under development and 19 Houge Park star party. Sunset 6:25 reserved. will be posted soon. To sign up, please p.m, 28% moon sets 10:14 p.m. Star 23 Houge Park star party. Sunset 4:53 go to the sign up form, then mark your party hours: 7:15 until 10:15 p.m. p.m, 83% moon sets 3:22 a.m. Star calendars! 26 Houge Park star party. Sunset 6:16 party hours: 7:00 until 10:00 p.m. p.m, 93% moon sets 5:30 a.m. Star 25 Astronomical Swap Meet. Noon to http://tinyurl.com/sjaa- party hours: 7:00 until 10:00 p.m. late afternoon. marathon-2012-10 24 hour news and information hotline: And please direct your questions to: (408) 559-1221 [email protected] http://www.sjaa.net Copyright © 2012 San Jose Astronomical Association, Inc. Volume 23 Number 10 Official publication of the San Jose Astronomical Association, October 2012 The Shallow Sky Where are they now? Akkana Peck Jupiter rises a few hours after dark Neptune, too, is tricky, off the left horn gravity so they sure seem like part of the throughout October. It doesn’t transit of Capricornus. It’s not bright enough solar system. until the wee hours of the morning ... that it will stand out as you’re sweeping but it’s far enough north that you should with binoculars or a finderscope, so use But enough about distance — as a be able to get some nice previews of this a star chart: there are a couple of 4th stargazer, I found myself curious where fall’s Jupiter opposition. and 5th magnitude stars in the area that Voyager 1 is in the sky. Not that there’s you can use as guides. a chance of seeing such a tiny, distant Mercury and Mars are low in the object ... but isn’t it fun to know where western evening sky. Mercury stays low Pluto joins Mercury and Mars as an early to look, even if you can’t see it? Look in the twilight all month. Mars is a bit evening object. It’s higher than the other for Voyager in Ophiuchus, about higher, but it’s low and distant, so if two, setting a little before 11pm, but it midway between Kappa Ophiuchi and you’re hoping to see lots of Mars surface never gets very high in the sky. So it’ll be Alpha Herculis (Rasalgethi), and about detail, you’ll be better off scanning a tough hunt down there in the Milky 45 arcminutes southeast of the 5th the latest downloads from the Mars Way horizon spurge. magnitude star 60 Herculis. Curiosity rover, which pulled off its tricky landing a few months ago with Venus is in the morning sky, making In a bit over 40,000 years, Voyager will flying colors and is now sending lots of a close double with Regulus on the pass relatively close to a red dwarf great high-resolution images back to morning of October 3. And a few weeks star called Gliese 445. That star is in Earth. later, early risers with a good dark Camelopardalis, just a tad west of the eastern horizon have a good chance at midway point between Polaris and Did you know that the people who the zodiacal light, a faint band of light Giausar, the last star in Draco’s tail. It’s drive the Mars Rovers live on Mars time, stretching up along the ecliptic. magnitude 10.8. not Earth? Their schedules follow the Martian day, called a “sol” — 39-1/2 Aside from Mars Curiosity, another Hey, wait a minute. Voyager 1 is in minutes longer than an Earth day — spacecraft was in the news recently. Ophiuchus, but it’s heading toward a so that every couple of weeks, they’re Voyager 1, originally launched in 1972, star in Camelopardalis? That’s about 75 working all night, sleeping in the is preparing to leave the solar system. degrees away. Wouldn’t you think that daytime. It’s already in the heliosheath — the the spacecraft and the star it’s heading “shock wave” region where the particles toward would be pretty much lined up Apparently NASA has found that’s easier of the solar wind crowds up against by now? for workers than to try to sleep on Earth the interstellar wind. NASA expects time but work during the Martian day. it to cross the heliopause soon, the Ah ... but that assumes Gliese 445 is outer edge of the sheath, where the standing still, and it isn’t. It’s moving For naked eye observers bound to solar wind become undetectable fairly fast, as stars go, and 40,000 normal Earth schedules, keep an eye against the background interstellar years gives it plenty of time to move on Mars around the third weekend of wind. Astrophysicists debate the exact somewhere else. I tried to verify that October, when it passes a few degrees location of the heliopause, so the Gliese 445’s proper motion will bring it away from Antares: offering a nice data beaming back to us should be into Ophiuchus by the year 40,272 AD, opportunity to compare Mars to the interesting. (see: http://www.jpl.nasa. but I haven’t found any reliable way to “Rival of Mars”, the anti-Ares. gov/news/news.php?release=2012-249) check that. Uranus and Neptune are well placed Of course, what it actually means to Even getting the sky locations of for observing all night. Uranus may leave the solar system is open to debate. Voyager and Gliese 445 wasn’t as easy be a bit more challenging than usual, Voyager 1 is now about 122 AU (about as I expected. You can get accurate located off in the middle of nowhere, 11 billion miles) from the sun. That’s far coordinates from JPL’s online HORIZONS the dark depths between Pisces, Cetus outside the Kuiper belt asteroids, which simulator, or general coordinates from and Aquarius. If you’re not familiar with extend from about 30 to 50 AU — but the “Spacecraft escaping the solar that area, try using the two “rump” surely the Oort cloud, at a staggering system” table on Heavens Above. stars of the Great Square of Pegasus as distance of 50,000 AU, nearly a light Then I could look those coordinates pointers — Uranus is bright enough that year, is also part of our solar system? The up in a planetarium program or on a a binocular sweep in the right direction comets and smaller particles comprising star chart. But curiously, the only site should be able to pick it up. the cloud are held there by the sun’s I found that would display an actual SJAA EPHEMERIS Page 2 October 2012 labeled star chart was Wolfram Alpha.
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