Contents  on 20 April '10

Resources:

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.

Radar Astrometry  on 20 April '10

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 1549 UTC when the database was dated 20 April

NEOCP Activity  on 20 April '10

The MPC's NEO Confirmation Page has 15 listings: 8 new, 7 updated

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

New MPECs  on 20 April '10

Minor Planet Electronic Circulars

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


MPEC 2010-H33 - "20:07 UT" - 2010 GW147


MPEC 2010-H32 - "19:10 UT" - 2010 GV147


MPEC 2010-H31 - "17:30 UT" - 2007 XB10


MPEC 2010-H30 - "17:28 UT" - 2009 CR2


<< DOU on 20 Apr. '10 >>  MPEC 2010-H29 - "06:12 UT" - Daily Orbit Update


MPEC 2010-H28 - "02:31 UT" - 2008 VK14

Observers  on 20 April '10

A total of 26 observing facilities appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2010-H29 -- 2010 HF
251Arecibo in Puerto Rico, 1 in radar -- 2005 YU55
H21Astronomical Research Obs. Westfield (ARO Westfield) in Illinois, 10 in MPECs 2010-H29 & 2010-H33 -- 2010 GW147, 2010 GU21, 2010 GT7, 2010 GO67, 2010 GH7, 2010 GE35, 2010 GA24, 2010 FX9, 2006 CX10, 153814
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2010-H29 -- 2010 GR75
160Castelmartini Obs. in Italy, 19 in MPEC 2010-H29 -- 2010 GU21, 2010 GS7, 2010 FF10, 2010 DB34, 2009 XC2, 2009 UY19, 2009 SO103, 2006 CX10, 2005 YU55, 2004 TB18, 85839, 68359, 54789, 232382, 218863, 163243, 142464, 141531, 141432
703Catalina Sky Survey in Arizona, 1 in MPEC 2010-H29 -- 2004 XD50
693Catalina Station in Arizona, 2 in MPEC 2010-H29 -- 2010 GA34, 1998 WB2
G58Chabot Obs. in northern California, 2 in MPEC 2010-H29 -- 2010 GA34, 2010 FC6
143Gnosca Obs. in Switzerland, 1 in MPEC 2010-H29 -- 2005 YU55
J95Great Shefford Obs. in England, 1 in MPEC 2010-H29 -- 2005 YU55
A17Guidestar Obs. in Germany, 1 in MPEC 2010-H29 -- 2010 GE35
185Jurassien-Vicques Obs. in Switzerland, 1 in MPEC 2010-H29 -- 1917
B90Malina River Obs. in Italy, 1 in MPEC 2010-H29 -- 2010 CL18
213Montcabre Obs. in Spain, 1 in MPEC 2010-H29 -- 2005 YU55
675{J.R. Masiero & J.W. Dailey via Mt. Palomar in southern California, 1 in MPEC 2010-H33 -- 2010 GW147
A13Naef Obs. in Switzerland, 5 in MPEC 2010-H29 -- 2010 GU21, 2010 GT7, 2010 FF10, 2009 UV18, 1999 HW1
2614Andrew Lowe in Alberta using the Palomar Digitized Sky Survey in southern California, 1 in MPEC 2010-H30 -- 2009 CR2
A32Panker Obs. in Germany, 2 in MPEC 2010-H29 -- 3554, 1627
C20Pulkovo Obs. Kislovodsk Mtn. Station in Russia, 207 in MPEC 2010-H29 -- 2009 XR2, 2009 XD, 2009 WZ104, 2009 WL1, 2009 WD11, 2009 UV18, 2009 RN, 2009 QD34, 2009 QB36, 2009 NH, 2009 CQ5, 2008 WN2, 2008 WL60, 2008 WB59, 2008 SQ1, 2008 QT3, 2008 MZ, 2008 EV5, 2008 CM, 2007 MK13, 2007 BT2, 2006 WZ2, 2006 VT2, 2006 SZ217, 2006 KZ37, 2006 AO4, 2005 WD1, 2005 TZ51, 2005 TY51, 2005 TE15, 2005 RQ6, 2005 MC, 2005 BC, 2005 AD3, 2004 XM35, 2004 XJ3, 2004 TB18, 2004 LV3, 2004 FM17, 2003 GW, 2002 WP, 2002 VY94, 2002 NW16, 2002 NP1, 2002 LV, 2002 LT38, 2001 FE90, 2000 CO101, 1994 AW1, 1993 RA, 99248, 90403, 89355, 88263, 87684, 86326, 86067, 85989, 85867, 85818, 85804, 85709, 85236, 68350, 68216, 66272, 66251, 55408, 54789, 54660, 54401, 53430, 53319, 52762, 52750, 52387, 38091, 36284, 35396, 35107, 33342, 30825, 24761, 231134, 228587, 22771, 222869, 222073, 22099, 220124, 219071, 218863, 218017, 217807, 217796, 217683, 216689, 215442, 215188, 214088, 20790, 206910, 206359, 20460, 200754, 194386, 190491, 189058, 187026, 177614, 175706, 17511, 173689, 17274, 16834, 164121, 163899, 163758, 162998, 162900, 162854, 162483, 162181, 161989, 159686, 159402, 159399, 15745, 155334, 154715, 154555, 154244, 153953, 153306, 152931, 152560, 143947, 143678, 143651, 143487, 142464, 142348, 141765, 138911, 138883, 138013, 137925, 137805, 137170, 137078, 136617, 12711, 11405, 11398, 11066, 105140, 10150, 9950, 9202, 9162, 8567, 8566, 7889, 7482, 7358, 6455, 5836, 5786, 5751, 5693, 5646, 5626, 5620, 5604, 5332, 5143, 5131, 5011, 4596, 4257, 4179, 4034, 4015, 3691, 3554, 3553, 3552, 3361, 3360, 3288, 3200, 3199, 3103, 2212, 2100, 1980, 1943, 1917, 1916, 1866, 1865, 1864, 1863, 1627, 1620, 1036, 433
B04Saint-Barthelemy Obs. in Italy, 2 in MPEC 2010-H29 -- 2010 EV45, 2010 EE43
204Schiaparelli Obs. in Italy, 1 in MPEC 2010-H29 -- 2009 UY19
D21Shenton Park Obs. in Western Australia, 3 in MPECs 2010-H28, 2010-H29 & 2010-H31 -- 2010 GH65, 2008 VK14, 2007 XB10
587Sormano Obs. in Italy, 5 in MPEC 2010-H29 -- 2010 HF, 2010 GE35, 2009 UY19, 2005 YU55, 1999 JR6
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2010-H29 -- 2010 FY80, 2010 FC81
H83Timberlake Obs. in Virginia, 1 in MPEC 2010-H29 -- 2010 GS7
C51WISE in Earth polar orbit, 2 in MPECs 2010-H32 & 2010-H33 -- 2010 GW147, 2010 GV147
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 April '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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2010 GH7JPL Sentry15492099-2110238.1e-05-5.70-6.190JPL: "Analysis based on 62 observations spanning 9.9303 days (2010-Apr-07.38604 to 2010-Apr-17.316375)." Diameter approximately 0.012 km. from mean, weighted H=27.3.
153814 2001 WN5NEODyS15492099-212246.33e-10-6.28-6.540NEODyS: "Based on 162 optical observations (of which 4 are rejected as outliers) from 1996/02/10.397 to 2010/04/19.274."
JPL Sentry1549R E M O V E DJPL: Risk listing removed at 2307 UTC 30 Jan..

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 20 April '10

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

2121Grabbed MPEC 2010-H33 - 2010 GW147 - see above
1932Grabbed MPEC 2010-H32 - 2010 GV147 - see above
1736Grabbed MPEC 2010-H30 - 2009 CR2 - see above
Grabbed MPEC 2010-H31 - 2007 XB10 - see above
1549Noted that JPL Sentry has removed 153814 2001 WN5 as an impact risk - see above
Noted that NEODyS has updated its 153814 2001 WN5 risk assessment - see above
Noted that JPL Sentry has updated its 2010 GH7 risk assessment - see above
Grabbed MPEC 2010-H29 - Daily Orbit Update - see above
Noted Radar Astrometry database update - see above
0321Grabbed MPEC 2010-H28 - 2008 VK14 - see above