Contents  on 1 May '09


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 1 May '09

The MPC's NEO Confirmation Page has 6 listings: 1 new, 5 updated

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

New MPECs  on 1 May '09

Minor Planet Electronic Circulars

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

MPEC 2009-J09 - "22:36 UT" - 2009 JA

MPEC 2009-J08 - "20:02 UT" - 2009 HM82

MPEC 2009-J07 - "17:16 UT" - 2009 HF82

MPEC 2009-J06 - "17:13 UT" - 2009 HE82

MPEC 2009-J05 - "17:08 UT" - 2009 HD82

MPEC 2009-J04 - "16:39 UT" - 2009 HC82

MPEC 2009-J03 - "16:34 UT" - 2009 HB82

MPEC 2009-J02 - "14:02 UT" - 1998 HN3

<< DOU on 1 May '09 >>  MPEC 2009-J01 - "06:10 UT" - Daily Orbit Update

Observers  on 1 May '09

Sixteen observing facilities appear in today's MPECs.

CodeObserver / observatory
B88Bigmuskie Obs. in Italy, 2 in MPEC 2009-J01 -- 2009 CQ1, 2008 WN2
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2009-J01 & 2009-J04 -- 2009 HC82, 2009 DE47, 25916, 162900, 142781
448Desert Moon Obs. in New Mexico, 3 in MPECs 2009-J01 & 2009-J06 -- 2009 HE82, 2009 FL25, 2002 LV
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2009-J01 -- 2009 HZ67
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2009-J01 -- 2009 HV44, 2008 WL60, 2007 BT2
704LINEAR in New Mexico, 10 in MPECs 2009-J01, 2009-J08 & 2009-J09 -- 2009 JA, 2009 HU44, 2009 HM82, 2009 HL21, 2005 SA71, 85867, 85774, 39557, 175706, 162181
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2009-J01, 2009-J02, 2009-J04, 2009-J06 & 2009-J07 -- 2009 HV2, 2009 HF82, 2009 HE82, 2009 HC82, 1998 HN3, 86666, 85953, 719
A13Naef Obs. in Switzerland, 1 in MPEC 2009-J04 -- 2009 HC82
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2009-J04 -- 2009 HC82
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2009-J02 -- 1998 HN3
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2009-J01 & 2009-J03 -- 2009 HB82, 12711, 433
B40Skylive Obs. in Italy, 1 in MPEC 2009-J01 -- 2009 HV44
587Sormano Obs. in Italy, 1 in MPEC 2009-J09 -- 2009 JA
691Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2009-J01 & 2009-J05 -- 2009 HY67, 2009 HD82, 2009 DL46, 99799, 85774, 27346
291Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2009-J01, 2009-J02, 2009-J04, 2009-J05, 2009-J06 & 2009-J07 -- 2009 HW67, 2009 HV58, 2009 HM73, 2009 HH21, 2009 HF82, 2009 HE82, 2009 HD82, 2009 HC82, 2009 HC, 2009 CB3, 2005 RN33, 2004 CL, 1998 HN3, 1990 UA
A48Verona Obs. in Italy, 4 in MPEC 2009-J01 -- 2009 HD, 2009 CQ1, 2008 WL60, 2007 BT2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 May '09

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. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few 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
2009 HF82JPL Sentry18522020-210775.1e-09-5.93-6.190JPL: "Analysis based on 13 observations spanning .90132 days (2009-Apr-30.2914 to 2009-May-01.19272)." Diameter approximately 0.230 km. from mean, weighted H=20.8.
2009 HM73JPL Sentry1337R E M O V E DJPL: Risk listing removed at 0849 UTC.
NEODyS1337R E M O V E D-
2009 HW67JPL Sentry13372046-207931.2e-06-6.19-6.520JPL: "Analysis based on 29 observations spanning 3.9159 days (2009-Apr-27.29601 to 2009-May-01.21192)." Diameter approximately 0.020 km. from mean, weighted H=26.1.
NEODyS13372046-207981.46e-06-6.10-6.450NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2009/04/27.297 to 2009/05/01.213."
2009 HV58JPL Sentry13372011-2108438.3e-08-3.23-3.390JPL: "Analysis based on 26 observations spanning 4.9324 days (2009-Apr-25.39439 to 2009-Apr-30.32682)." Diameter approximately 0.438 km. from mean, weighted H=19.4.
NEODyS13372011-2090335.56e-08-3.28-3.410NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2009/04/25.395 to 2009/04/30.328."
2009 HCJPL Sentry13372097-209951.1e-06-6.35-6.880JPL: "Analysis based on 102 observations spanning 12.972 days (2009-Apr-17.23164 to 2009-Apr-30.20345)." Diameter approximately 0.036 km. from mean, weighted H=24.9.

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 1 May '09

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

2243Grabbed MPEC 2009-J09 - 2009 JA - see above
2018Grabbed MPEC 2009-J08 - 2009 HM82 - see above
1852Noted that JPL Sentry has posted 2009 HF82 as an impact risk - see above
1736Grabbed MPEC 2009-J05 - 2009 HD82 - see above
Grabbed MPEC 2009-J06 - 2009 HE82 - see above
Grabbed MPEC 2009-J07 - 2009 HF82 - see above
1700Grabbed MPEC 2009-J03 - 2009 HB82 - see above
Grabbed MPEC 2009-J04 - 2009 HC82 - see above
1432Grabbed MPEC 2009-J02 - 1998 HN3 - see above
1337Noted that JPL Sentry has updated its 2009 HC risk assessment - see above
Noted that JPL Sentry has removed 2009 HM73 as an impact risk - see above
Noted that NEODyS has removed 2009 HM73 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 HV58 risk assessment - see above
Noted that NEODyS has updated its 2009 HV58 risk assessment - see above
Noted that JPL Sentry has updated its 2009 HW67 risk assessment - see above
Noted that NEODyS has updated its 2009 HW67 risk assessment - see above
Grabbed MPEC 2009-J01 - Daily Orbit Update - see above