Contents  on 23 August '09

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.

NEOCP Activity  on 23 August '09

The MPC's NEO Confirmation Page has 4 listings: 2 new, 2 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and two updated listings. Of these, two were "one nighters."

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 23 August '09

Minor Planet Electronic Circulars

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


MPEC 2009-Q51 - "23:07 UT" - Comet C/2009 P1 (Garradd)


<< DOU on 23 Aug. '09 >>  MPEC 2009-Q50 - "06:07 UT" - Daily Orbit Update

Observers  on 23 August '09

A total of 23 observing facilities appear in today's MPECs.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2009-Q50 -- 2009 MC9
J16An Carraig Obs. in Northern Ireland, 2 in MPEC 2009-Q50 -- 2009 NA, 16834
B88Bigmuskie Obs. in Italy, 1 in MPEC 2009-Q50 -- 2009 QH2
300Bisei Spaceguard Center in Japan, 2 in MPEC 2009-Q50 -- 2009 QK9, 2009 QJ9
J05Bootes Obs., 3 in MPEC 2009-Q50 -- 2009 OC, 11066, 3200
160Castelmartini Obs. in Italy, 1 in MPEC 2009-Q50 -- 2009 QE8
703Catalina Sky Survey in Arizona, 1 in MPEC 2009-Q50 -- 4015
176Consell Obs. in Spain, 5 in MPEC 2009-Q50 -- 2009 QZ6, 2009 QS, 2009 QL2, 2009 QH2, 2009 QC
I21El Condor Obs. in Argentina, 1 in MPEC 2009-Q51 -- C/2009 P1
J95Great Shefford Obs. in England, 1 in MPEC 2009-Q50 -- 2009 QL8
A17Guidestar Obs. in Germany, 5 in MPEC 2009-Q50 -- 2009 QQ8, 2009 QK2, 2009 QE8, 152664, 8566
240Herrenberg Obs. in Germany, 1 in MPEC 2009-Q50 -- 162215
704LINEAR in New Mexico, 6 in MPEC 2009-Q50 -- 2009 QK9, 2009 QJ9, 2009 NH, 52750, 215167, 5587
J75La Sagra Obs. in Spain, 3 in MPEC 2009-Q50 -- 2009 QE8, 2009 CS1, 52750
423North Ryde Obs. in New South Wales, 1 in MPEC 2009-Q51 -- C/2009 P1
A32Panker Obs. in Germany, 1 in MPEC 2009-Q50 -- 217430
D908program code 8 via RAS Obs. Moorook in South Australia, 1 in MPEC 2009-Q50 -- 2009 PR1
I20Rio Cuarto Obs. in Argentina, 4 in MPEC 2009-Q50 -- 2009 PQ1, 2006 AD, 52762, 155334
204Schiaparelli Obs. in Italy, 4 in MPEC 2009-Q50 -- 2009 QJ9, 2009 QJ2, 2009 QG2, 2009 QC
E12Siding Spring Survey in New South Wales, 1 in MPEC 2009-Q50 -- 2009 PY
B40Skylive Obs. in Italy, 1 in MPEC 2009-Q50 -- 2009 QJ9
I19Tanti Obs. in Argentina, 3 in MPEC 2009-Q50 -- 2009 PU1, 2009 CQ5, 2004 RU10
G56Walnut Creek Obs. in northern California, 1 in MPEC 2009-Q50 -- 2009 QH6
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 August '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.
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
2009 QL8JPL Sentry15002013-21081339.6e-08-3.92-4.680JPL: "Analysis based on 25 observations spanning 1.6541 days (2009-Aug-20.39152 to 2009-Aug-22.04558)." Diameter approximately 0.528 km. from mean, weighted H=19.0.
NEODyS15002013-20841186.01e-08-3.80-4.400NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2009/08/20.392 to 2009/08/22.046."
2009 QZ6NEODyS1500R E M O V E D-

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 23 August '09

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

2358Grabbed MPEC 2009-Q51 - Comet C/2009 P1 (Garradd) - see above
1500Noted that JPL Sentry has updated its 2009 QL8 risk assessment - see above
Noted that NEODyS has updated its 2009 QL8 risk assessment - see above
Noted that NEODyS has removed 2009 QZ6 as an impact risk - see above
Grabbed MPEC 2009-Q50 - Daily Orbit Update - see above