1P/Halley observed by Hainaut/ESO from 
Cerro Paranal 6-8 March 2003

A new study announced yesterday (also here) argues that "more than 90 percent of the observed Oort cloud comets have an extra-solar origin" (acquired from neighboring stellar nursery protoplanetary disks). One probable Oort Cloud object is 1P/Halley, seen here between background star trails as its dark inactive nucleus was outward bound seven years ago at 28.06 times Earth's distance from the Sun. Credit ESO, observation by Olivier Hainaut with three eight-meter telescopes for three nights at Cerro Paranal in Chile to capture Halley at magnitude V=28.2.

Contents  on 11 June '10


The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

NEOCP Activity  on 11 June '10

The MPC's NEO Confirmation Page has 7 listings: 4 new, 3 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four new and three updated listings. Of these, two were "one nighters." So far The Tracking News has counted a total of eight listings on the NEOCP at some point today.

New MPECs  on 11 June '10

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2010-L60 - "21:30 UT" - Comets C/1997 S6, 1998 D1, 1999 R5, 1999 S8, 2001 W5, 2002 B4 (SOHO)

<< DOU on 11 June '10 >>  MPEC 2010-L59 - "06:09 UT" - Daily Orbit Update

Observers  on 11 June '10

Fifteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2010-L59 -- 2010 LJ14, 2010 LF14, 2010 LF, 2010 KP10, 2010 KD, 2010 JK41, 2010 JG88, 2010 GH30, 2010 CJ171, 2008 JV19, 2007 JZ20, 2006 KM103
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2010-L59 -- 2009 VO24, 2008 JV19, 2004 XD50, 2004 JX20, 218863, 138847, 1866, 887
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2010-L59 -- 2010 JF88
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2010-L59 -- 2010 LM34
B33Libbiano Obs. in Italy, 4 in MPEC 2010-L59 -- 2010 LM34, 2010 EV45, 2000 KO44, 85989
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2010-L59 -- 2010 FZ80
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2010-L59 -- 2007 VG189, 2000 EF104, 85628, 143381
B38Santa Mama Obs. in Italy, 1 in MPEC 2010-L59 -- 137170
E12Siding Spring Survey (SSS) in New South Wales, 11 in MPEC 2010-L59 -- 2010 LN14, 2010 CM44, 2010 CC180, 2009 CQ5, 2001 HC, 1996 BA1, 25916, 19764, 138095, 5653, 1685
2492LASCO Coronagraph 2 aboard the Solar & Heliospheric Obs. in Earth-Sun L1 HALO orbit, 1 in MPEC 2010-L60 -- C/2001 W5
2493LASCO Coronagraph 3 (SOHO C3) aboard the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 5 in MPEC 2010-L60 -- C/2002 B4, C/1999 S8, C/1999 R5, C/1998 D1, C/1997 S6
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2010-L59 -- 2010 GX62, 23187
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2010-L59 -- 2010 KD, 2010 JK33, 2010 GY6, 2010 CN44, 2006 KR1, 2001 XU
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2010-L59 -- 2009 KD5
C51WISE in Earth polar orbit, 4 in MPEC 2010-L59 -- 54789, 215442, 164121, 2368
G56Walnut Creek Obs. in northern California, 1 in MPEC 2010-L59 -- 2010 CJ171
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 June '10

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.





Notes for Today's Latest Risk Assessments
2010 LM34JPL Sentry15592036-204821.9e-08-6.56-6.570JPL #2 for the day: "Analysis based on 28 observations spanning .67108 days (2010-Jun-10.2894 to 2010-Jun-10.96048)." Diameter approximately 0.079 km. from mean, weighted H=23.2.
NEODyS1559204811.71e-08-6.68-6.680NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2010/06/10.290 to 2010/06/10.961."
2010 LL34NEODyS15592014-20902092.03e-07-3.18-3.690NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2010/06/09.403 to 2010/06/10.452."

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology  on 11 June '10

Times are UTC for when items were noted or added by The Tracking News.

2358Grabbed MPEC 2010-L60 - Comets C/1997 S6, 1998 D1, 1999 R5, 1999 S8, 2001 W5, 2002 B4 (SOHO) - see above
1559Noted that NEODyS has posted 2010 LL34 as an impact risk - see above
Noted that JPL Sentry has updated its 2010 LM34 risk assessment - see above
Noted that NEODyS has posted 2010 LM34 as an impact risk - see above
Grabbed MPEC 2010-L59 - Daily Orbit Update - see above
0400Noted that JPL Sentry has posted 2010 LM34 as an impact risk - see above