As it is always delightful to add to the Messier Marathon the observation of as many of the planets as possible, it must be noted that for 2010, Mercury and Uranus (conjunction with the sun on March 17, almost at New Moon) will be impossible, while Jupiter will be a very difficult (conjunction on February 28) and Neptune an extremely difficult morning object (conjunction on February 14 and faint).
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 and the Fachgruppe Kometen list):
Comet                       RA  (2000.0)  Dec  mag    RA  (2000.0)  Dec  mag
                                March 15, 2010            March 20, 2010
157P/Tritton                04:06.52 +22:40.2  12.1   04:25.39 +22:56.6  12.2  5deg E of M45
44P/Reinmuth                07:58.25 +18:04.2  10.4   07:57.54 +18:06.2  10.9
29P/Schwassmann-Wachmann 1  09:21.57 +13:11.1  15.6   09:20.05 +13:15.8  15.6  Outbursts! c. 11m
81P/Wild                    14:10.16 -06:49.2   9.4   14:12.64 -06:38.4   9.3
C/2007 Q3 Siding Spring     15:22.21 +55:34.3  10.9   15:23.30 +57:07.0  11.0  near M102!
10P/Tempel 2                18:35.93 -13:33.8  12.7   18:48.70 -13:24.7  12.5
C/2009 K5 McNaught          19:12.87 +05:43.4  10.6   19:19.63 +10:32.9  10.3
65P/Gunn                    19:28,83 -25:10.0  13.0   19:37.87 -25:08.5  12.9  5deg N of M55
C/2006 W3 Christensen       20:17.16 -25:07.7  14.2   20:18.53 -25:44.3  14.2
C/2009 R1 McNaught          22:16.62 -09:27.3  13.8   22:22.93 -08:08.5  13.6  close to sun - elong 21 deg/24 deg
C/2009 O2 Catalina          22:26.44 +38:29.6   9.4   23:31.01 +43:07.4   9.1  difficult - elong 44 deg
For the record: Southerners with large instruments may still try to spot
now-faint (mag 20.1) old friend C/1995 O1 Hale-Bopp at 
RA 01:33.56, Dec -83:37.4!
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).
Of the "first" four minor planets, (1) Ceres, (2) Pallas, and in particular, (4) Vesta (which had its opposition on February 17) will be easily observable, while (3) Juno will be more difficult. 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 14, 2010           March 21, 2010
(1) Ceres    17:53:58 -29:59.0  8.8   18:00:49 -21:33.0  8.7
(2) Pallas   15:52:14 +11:52.6  8.9   15:53:59 +13:33.3  8.8
(3) Juno     02:42:46 +05:33.7  9.7   02:57:37 +06:46.4  9.7
(4) Vesta    09:56:51 +22:13.4  6.5   09:52:22 +22:33.2  6.6 
Also, meteors from various showers may occur, and depending on your location, you may be able to observe the International Space Station, ISS.
If you have undertaken, or participated in, a Messier Marathon, 2010 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
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Last Modification: March 15, 2010