Contents  on 8 May '11


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 8 May '11

The MPC's NEO Confirmation Page has 21 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 21 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 27 listings on the NEOCP 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 8 May '11

Minor Planet Electronic Circulars

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

MPEC 2011-J34 - "19:13 UT" - 2009 KQ4

<< DOU on 8 May '11 >>  MPEC 2011-J33 - "07:08 UT" - Daily Orbit Update

Observers  on 8 May '11

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2011-J33 -- 2011 JA
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2011-J33 & 2011-J34 -- 2011 HS4, 2011 HS, 2009 KQ4
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2011-J33 -- 2001 QP181, 89958, 163250, 141531, 4954, 4401
807|Robert Holmes via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2011-J34 -- 2009 KQ4
A77Chante-Perdrix Obs. in France, 1 in MPEC 2011-J33 -- 2011 GL60
C13Como Obs. in Italy, 1 in MPEC 2011-J33 -- 2011 HL7
113Drebach Obs. in Germany, 5 in MPEC 2011-J33 -- 2011 HO, 2011 GQ65, 2011 FB29, 2011 EZ78, 2011 AO52
639Dresden Obs. in Germany, 1 in MPEC 2011-J33 -- 164121
704LINEAR in New Mexico, 5 in MPEC 2011-J33 -- 2011 HT, 2011 HS, 2011 HQ, 2011 HO, 2007 LQ19
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-J33 -- 2011 AG5
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2011-J33 -- 2011 GB3, 2007 HF44, 7889, 6037
A24New Millennium Obs. in Italy, 15 in MPEC 2011-J33 -- 2011 HQ, 2011 GL62, 89830, 274138, 263976, 260141, 250614, 23187, 198856, 163696, 162463, 141525, 141432, 136617, 4954
233San Vito Obs. in Italy, 1 in MPEC 2011-J33 -- 2001 QP181
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-J33 -- 2011 HR60
204Schiaparelli Obs. in Italy, 6 in MPEC 2011-J33 -- 2011 JE1, 2011 JD1, 2011 HQ, 2011 HO, 2010 VN65, 2000 JE5
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2011-J33 -- 2008 FT6, 2007 HA59
291Spacewatch 1.8m telescope in Arizona, 18 in MPEC 2011-J33 -- 2011 JL, 2011 HS60, 2011 HR, 2011 HQ, 2011 HO53, 2011 HO5, 2011 HN24, 2011 HJ7, 2011 HG, 2011 HF, 2011 HE24, 2011 HD63, 2011 HC36, 2011 GX65, 2011 GO65, 2011 GA62, 2010 CN1, 2009 JO2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 May '11

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. 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
2011 HN24NEODyS1631R E M O V E D-
2011 HJ7JPL Sentry1631209424.5e-09-7.12-7.290JPL: "Analysis based on 30 observations spanning 11.941 days (2011-Apr-26.21907 to 2011-May-08.15977)." Diameter approximately 0.120 km. from mean, weighted H=22.2.
2011 HO5JPL Sentry16312064-2109462.3e-05-4.60-4.840JPL: "Analysis based on 46 observations spanning 10.011 days (2011-Apr-27.39956 to 2011-May-07.4103)." Diameter approximately 0.048 km. from mean, weighted H=24.3.
NEODyS16312069-2090322.08e-05-4.65-4.850NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2011-04-27.400 to 2011-05-07.411."
2011 AG5NEODyS16312036-2057132.73e-04-1.90-1.91NEODyS: "Based on 128 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-05-07.460."

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 8 May '11

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

2202Grabbed MPEC 2011-J34 - 2009 KQ4 - see above
1631Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has updated its 2011 HJ7 risk assessment - see above
Noted that NEODyS has removed 2011 HN24 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 HO5 risk assessment - see above
Noted that NEODyS has updated its 2011 HO5 risk assessment - see above
Grabbed MPEC 2011-J33 - Daily Orbit Update - see above