As it is always delightful to add to the Messier Marathon the observation of as many of the planets as possible, with Uranus, Neptune, and Mercury impossible this year.
Some comets brighter than about mag 14.0 will be visible; we will list them below from various sources (e.g., IAU's Observable Comets page, Skyhound's Comet Chasing page, Gary Kronk's list of current comets, Seiichi Yoshida's Visual Comet lists for the northern and southern hemisphere, and the Fachgruppe Kometen list):
Comet RA (2000.0) Dec mag RA (2000.0) Dec mag March 18, 2012 March 25, 2012 C/2012 C2 Bruenjes 00:55:43 +14:40.8 12 00:49:22 +14:02.1 12 Early evening setter 21P/Giacobini-Zinner 01:36:20 -00:25.6 11.3 02:04:15 +00:12.0 11.6 78P/Gehrels 03:06:12 +14:07.6 13.9 03:21:43 +15:02.2 14.0 255P/2006 T1 Levy 07:46:56 -24:26.0 10.3 08:09:40 -23:33.9 10.8 C/2009 P1 Garradd 11:22:23 +68:45.0 7.5 10:13:24 +63:49.7 7.7 29P/Schwassmann-Wachmann 1 12:26:55 -13:01.5 15.6 12:23:51 -12:47.4 15.6 Outbursts! c. 13m C/2011 F1 LINEAR 15:42:43 +53:14.2 13.6 15:40:21 +54:12.4 13.5 (596) Sheila 16:50:11 -15:57.6 13.5 16:54:54 -16:23.6 13.4 C/2006 S3 LONEOS 18:08:57 -13:50.6 12.7 18:05:42 -13:44.9 12.6 C/2011 Q2 McNaught 23:30:37 +21:29.2 14.0 23:51:40 +24:21.8 14.2 C/2009 F4 McNaught 02:39:10 -66:43.5 14.2 02:49:54 -64:55.4 14.2For the record: Southerners with large instruments may still try to spot now-faint (mag 20.7) old friend C/1995 O1 Hale-Bopp at RA 01:04:30, Dec -83:52.4!
Note that occasionally comets become bright shortly (like Hyakutake in 1996,
Ikeya-Zhang and Utsunomiya in 2002), so check back for possible updates
shortly before Marathon date. Also occasionally, a supernova of brightness
available to amateur telesopes may have flashed up be spottable in time
(like SN 1998S in NGC 3877, SN 2002ap in M74, SN 2006X in M100 in their
years of appearance).
This year 2012, just in time for the main Messier Marathon date, bright
supernova SN 2012aw
occurred in M95! Discovered on March 16, 2012,
it was found at about mag 13.1 on March 19 and rapidly rising. What a great
extra for this year's Messier Marathon!
In addition, we have comet C/2009 P1 Garradd at about mag 7.5,
and observers with larger telescopes may be able to spot the fading
SN 2011fe in M101, which had
occurred on August 24, 2011 and brightened to 10th magnitude in
September 2011; it has now faded to 14.8 mag (late February 2012) and
may be around 15th magnitude at marathon dates.
This year, of the "first" four minor planets, only (3) Juno will be reasonably observable, while (1) Ceres, (2) Pallas, and (4) Vesta will be so close to the Sun (at less than 25 degrees elongation) that observing will be extremely difficult and more probably impossible. For those who want to try these objects, data for the two weekends in question are as follows:
Planet RA (2000.0) Dec mag RA (2000.0) Dec mag March 18, 2012 March 25, 2012 (1) Ceres 01:26:19 +02:11.5 9.1 01:36:13 +03;22.2 9.1 (2) Pallas 22:37:56 +00:51.0 10.3 22:46:52 +01:20.9 10.3 (3) Juno 16:28:47 -08:22.1 10.9 16:29:40 -07:49.0 10.8 (4) Vesta 00:43:40 -00:52.3 8.2 00:55:34 +00:25.1 8.1
Also, meteors from various showers may occur, and depending on your location, you may be able to observe the International Space Station, ISS.
After having their first results in from the March 17, 2012 event, the group "Wanderlust" & "Nayka Nature Lovers Club" are holding a second event this year, on March 24, 2012 at the same place, a dark patch of Matheran (hill station) near Mumbai, India. - Dr. Ajay Pradhan from Mumbai (India), http://www.drajaypradhan.com/
If you have undertaken, or participated in, a Messier Marathon, 2012 or earlier, if not already done so, please send me your or your group's results, or the link to your results page, for inclusion in our Messier Marathon Results page!
Hartmut Frommert
Christine Kronberg
[contact]
Last Modification: March 23, 2012