Contents  on 24 September '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 24 September '11

The MPC's NEO Confirmation Page has 49 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 49 objects listed. Of these, 40 were "one nighters." So far The Tracking News has counted a total of 61 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 24 September '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-S62 - "23:53 UT" - 2011 SE58

<< DOU on 24 Sept. '11 >>  MPEC 2011-S61 - "06:03 UT" - Daily Orbit Update

Observers  on 24 September '11

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
A50Andrushivka Obs. in the Ukraine, 1 in MPEC 2011-S61 -- 96189
C60Argelander Institute for Astronomy Obs. in Germany, 1 in MPEC 2011-S61 -- 2011 SO32
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2011-S61 -- 2011 ST12, 2011 SR5, 2011 SQ25, 2011 SP12, 2011 SF25, 2010 EK12, 2007 QX14
160Castelmartini Obs. in Italy, 5 in MPEC 2011-S61 -- 2011 SR5, 2011 QY39, 2011 OV4, 2011 LJ19, 2004 SV55
703Catalina Sky Survey (CSS) in Arizona, 10 in MPEC 2011-S61 -- 2011 QE14, 2001 UE5, 2001 QP181, 85713, 26760, 24475, 163760, 136923, 4341, 2212
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2011-S61 -- 2011 SQ12, 2011 SO5, 2011 SK16, 2011 QF23, 2011 QD48, 2011 OJ5
821Cordoba-Bosque Alegre Obs., 3 in MPEC 2011-S61 -- 2011 SF3, 2011 QD48, 2007 YF1
113Drebach Obs. in Germany, 1 in MPEC 2011-S61 -- 285625
151Eschenberg Obs. in Switzerland, 1 in MPEC 2011-S61 -- 2011 SR5
J95Great Shefford Obs. in England, 2 in MPECs 2011-S61 & 2011-S62 -- 2011 SR5, 2011 SE58
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2011-S61 -- 2011 PT1, 2011 LJ19, 1917
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2011-S61 -- 1943
704LINEAR in New Mexico, 7 in MPEC 2011-S61 -- 2011 SO5, 2011 SO32, 2011 GA55, 2009 SK1, 2008 VH, 85709, 283457
C01Lohrmann Obs. in Germany, 5 in MPEC 2011-S61 -- 2011 SR5, 2011 LJ19, 37336, 138524, 3988
C10Maisoncelles Obs. in France, 1 in MPEC 2011-S61 -- 3200
900Moriyama Obs. in Japan, 1 in MPEC 2011-S61 -- 163760
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2011-S61 -- 285179, 5653
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPEC 2011-S61 -- 2008 EZ5, 2004 TB18, 20429, 7025, 4503
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2011-S61 -- 4503
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 3 in MPECs 2011-S61 & 2011-S62 -- 2011 SR5, 2011 SO5, 2011 SE58
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-S61 -- 2011 SP32
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2011-S61 -- 274855, 190166
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2011-S61 & 2011-S62 -- 2011 SE58, 2011 RJ1, 2011 PE2, 2011 HD63, 2003 YS17
A98Taurus-1 Obs. in Belarus, 1 in MPEC 2011-S61 -- 2000 SP43
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 September '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 risk pages.





Notes for Today's Latest Risk Assessments
2011 SR5NEODyS14302030-203011.01e-07-4.22-4.220NEODyS: "Based on 135 optical observations (of which 2 are rejected as outliers) from 2011-09-19.368 to 2011-09-23.900."
2011 PE2NEODyS14302027-209022.2e-08-6.29-6.290NEODyS: "Based on 91 optical observations (of which 0 are rejected as outliers) from 2011-08-08.065 to 2011-09-23.359."

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 24 September '11

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

2359Grabbed MPEC 2011-S62 - 2011 SE58 - see above
1430Noted that NEODyS has updated its 2011 PE2 risk assessment - see above
Noted that NEODyS has reposted 2011 SR5 as an impact risk - see above
Grabbed MPEC 2011-S61 - Daily Orbit Update - see above