Contents  on 30 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 30 May '09

The MPC's NEO Confirmation Page has 7 listings: 7 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven updated listings. Of these, five were "one nighters." So far The Tracking News has counted a total of fourteen listings on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 30 May '09

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2009-K76 - "23:51 UT" - 2009 KL2

MPEC 2009-K75 - "21:55 UT" - 2009 KL8

MPEC 2009-K74 - "21:51 UT" - 2009 KK8

<< DOU on 30 May '09 >>  MPEC 2009-K73 - "06:08 UT" - Daily Orbit Update

Observers  on 30 May '09

Seventeen observing facilities appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2009-K73, 2009-K74 & 2009-K75 -- 2009 KL8, 2009 KK8, 162181, 433
693Catalina Station in Arizona, 1 in MPEC 2009-K74 -- 2009 KK8
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2009-K73 -- 2009 KD5
151Eschenberg Obs. in Switzerland, 4 in MPEC 2009-K73 -- 2009 JM2, 2005 MO13, 2002 LV, 1998 SC15
J95Great Shefford Obs. in England, 2 in MPECs 2009-K75 & 2009-K76 -- 2009 KL8, 2009 KL2
J75La Sagra Obs. in Spain, 2 in MPEC 2009-K73 -- 2009 KD5, 5693
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2009-K74 & 2009-K75 -- 2009 KL8, 2009 KK8
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2009-K73 & 2009-K74 -- 2009 KK8, 177049
H36Sandlot Obs. in Kansas, 3 in MPECs 2009-K73 & 2009-K76 -- 2009 KR4, 2009 KL2, 2009 KD5
204Schiaparelli Obs. in Italy, 1 in MPEC 2009-K73 -- 2009 KV2
D21Shenton Park Obs. in Western Australia, 2 in MPEC 2009-K73 -- 2009 KV2, 2009 KD3
E12Siding Spring Survey in New South Wales, 1 in MPEC 2009-K73 -- 2009 KD3
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2009-K73 -- 31345
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2009-K73 -- 2009 KT4, 2009 KQ4, 2009 KK, 2009 HZ67, 2009 HV58, 2009 HF88
611Starkenburg Obs. in Germany, 1 in MPEC 2009-K73 -- 2002 LV
926Tenagra II Obs. in Arizona, 1 in MPEC 2009-K76 -- 2009 KL2
198Wildberg Obs. in Germany, 1 in MPEC 2009-K73 -- 142781
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 May '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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 KK8JPL Sentry23592017-2087109.8e-08-3.87-4.300JPL: "Analysis based on 27 observations spanning 2.0249 days (2009-May-28.43417 to 2009-May-30.45911)." Diameter approximately 0.625 km. from mean, weighted H=18.7.
2009 KQ4JPL Sentry1534R E M O V E DJPL: Risk listing removed at 0848 UTC.
NEODyS1534R E M O V E D-
2009 KKJPL Sentry1704202216.9e-05-1.31-1.311JPL: "Analysis based on 86 observations spanning 12.033 days (2009-May-17.25987 to 2009-May-29.29258)." Diameter approximately 0.270 km. from mean, weighted H=20.5.
NEODyS1534202216.92e-05-1.31-1.311NEODyS: "Based on 86 optical observations (of which 0 are rejected as outliers) from 2009/05/17.261 to 2009/05/29.293. NOTE: The Virtual Impactor in 2022/05/29.761 ... is rated as Torino Scale 1."

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 30 May '09

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

2359Noted that JPL Sentry has posted 2009 KK8 as an impact risk - see above
Grabbed MPEC 2009-K76 - 2009 KL2 - see above
2223Grabbed MPEC 2009-K75 - 2009 KL8 - see above
2154Grabbed MPEC 2009-K74 - 2009 KK8 - see above
1704Noted that JPL Sentry has updated its 2009 KK risk assessment - see above
1534Noted that NEODyS has updated its 2009 KK risk assessment - see above
Noted that JPL Sentry has removed 2009 KQ4 as an impact risk - see above
Noted that NEODyS has removed 2009 KQ4 as an impact risk - see above
0811Grabbed MPEC 2009-K73 - Daily Orbit Update - see above