Contents  on 19 December '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 19 December '09

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

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four updated listings. Of these, two were "one nighters." So far The Tracking News has counted a total of eleven 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 19 December '09

Minor Planet Electronic Circulars

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


MPEC 2009-Y31 - "22:05 UT" - 2009 YS


MPEC 2009-Y30 - "22:02 UT" - 2009 YR


MPEC 2009-Y29 - "14:53 UT" - 2009 YQ


MPEC 2009-Y28 - "14:47 UT" - 2009 YP


MPEC 2009-Y27 - "14:36 UT" - 2009 YO


MPEC 2009-Y26 - "13:53 UT" - 2008 CD22


<< DOU on 19 Dec. '09 >>  MPEC 2009-Y25 - "07:13 UT" - Daily Orbit Update

Observers  on 19 December '09

Nineteen observing facilities appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2009-Y25 -- 2009 XR2
H21Astronomical Research Obs. Westfield (ARO Westfield) in Illinois, 16 in MPEC 2009-Y25 -- 2009 XV1, 2009 XV, 2009 XP7, 2009 XP2, 2009 XO2, 2009 XO, 2009 XD, 2009 WZ104, 2009 WX51, 2009 WW25, 2009 WM105, 2009 WF, 2009 VO24, 2009 VA1, 2009 TK8, 25143
300Bisei Spaceguard Center in Japan, 1 in MPEC 2009-Y31 -- 2009 YS
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2009-Y25 & 2009-Y31 -- 2009 YS, 2009 XC2, 2009 WO6, 2006 WR1, 2006 BA148, 85839, 20790, 159402, 153243, 137078, 137062, 9950, 5751
J95Great Shefford Obs. in England, 2 in MPECs 2009-Y25 & 2009-Y30 -- 2009 YR, 2009 YG
442Gualba Obs. in Spain, 1 in MPEC 2009-Y25 -- 4015
704LINEAR in New Mexico, 14 in MPEC 2009-Y25 -- 2009 YG, 2009 YF, 2009 XD, 2007 UR3, 2006 KZ37, 2005 TY51, 2004 XD50, 96590, 86326, 35396, 215188, 21088, 177614, 103067
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2009-Y25, 2009-Y27, 2009-Y28, 2009-Y29, 2009-Y30 & 2009-Y31 -- 2009 YS, 2009 YR, 2009 YQ, 2009 YP, 2009 YO, 2009 XT6
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2009-Y26 -- 2008 CD22
932McCarthy Obs. in Connecticut, 1 in MPEC 2009-Y25 -- 2009 XR2
900Moriyama Obs. in Japan, 1 in MPEC 2009-Y25 -- 2005 MC
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2009-Y25, 2009-Y27, 2009-Y28, 2009-Y29 & 2009-Y30 -- 2009 YR, 2009 YQ, 2009 YP, 2009 YO, 2009 WR6, 2009 NA, 2009 MX6, 2005 QL, 2002 VC92, 217683, 154300, 4015
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2009-Y25 -- 2008 AF4
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2009-Y25 -- 2009 XT6
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2009-Y31 -- 2009 YS
E12Siding Spring Survey (SSS) in New South Wales, 8 in MPEC 2009-Y25 -- 2009 WN25, 2006 WY2, 2004 TR12, 222073, 162980, 162181, 10563, 8566
J26Spaceguard Centre in Wales, 1 in MPEC 2009-Y25 -- 2002 XN14
691Spacewatch 0.9m telescope in Arizona, 8 in MPEC 2009-Y25 -- 2009 XO, 2009 WF104, 2006 UR, 2005 QL, 2002 NX, 39572, 6456, 5693
291Spacewatch 1.8m telescope in Arizona, 20 in MPECs 2009-Y25, 2009-Y27, 2009-Y28 & 2009-Y29 -- 2009 YQ, 2009 YP, 2009 YO, 2009 XQ1, 2009 XG8, 2009 XA2, 2009 WY51, 2009 WR25, 2009 WP25, 2009 WH104, 2009 UE2, 2009 UD2, 2009 TL4, 2009 SV17, 2007 AG12, 2006 YT13, 2006 SU131, 2002 HF8, 2001 SA270, 1998 HN3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 December '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 YQJPL Sentry17192015-2102134.2e-09-5.32-5.640JPL: "Analysis based on 12 observations spanning 1.0671 days (2009-Dec-18.47637 to 2009-Dec-19.54348)." Diameter approximately 0.293 km. from mean, weighted H=20.3.
2009 YGJPL Sentry16382033-2109363.5e-07-2.86-3.510JPL: "Analysis based on 25 observations spanning 1.7126 days (2009-Dec-17.42051 to 2009-Dec-19.13312)." Diameter approximately 0.862 km. from mean, weighted H=18.0.
NEODyS16382033-2089142.16e-07-2.96-3.510NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2009/12/17.421 to 2009/12/19.134."
2009 XT6JPL Sentry16382037-207122.4e-07-4.04-4.040JPL: "Analysis based on 64 observations spanning 5.0222 days (2009-Dec-13.4056 to 2009-Dec-18.4278)." Diameter approximately 0.320 km. from mean, weighted H=20.1.
NEODyS1638207112.61e-07-4.01-4.010NEODyS: "Based on 64 optical observations (of which 0 are rejected as outliers) from 2009/12/13.406 to 2009/12/18.429."
2009 XONEODyS1638202815.1e-08-4.50-4.500NEODyS: "Based on 88 optical observations (of which 0 are rejected as outliers) from 2009/12/09.153 to 2009/12/18.437."
2008 AF4JPL Sentry1638R E M O V E DJPL: Risk listing removed at 1107 UTC.

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 19 December '09

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

2253Grabbed MPEC 2009-Y30 - 2009 YR - see above
Grabbed MPEC 2009-Y31 - 2009 YS - see above
1719Noted that JPL Sentry has posted 2009 YQ as an impact risk - see above
1638Noted that JPL Sentry has removed 2008 AF4 as an impact risk - see above
Noted that NEODyS has updated its 2009 XO risk assessment - see above
Noted that JPL Sentry has updated its 2009 XT6 risk assessment - see above
Noted that NEODyS has updated its 2009 XT6 risk assessment - see above
Noted that JPL Sentry has updated its 2009 YG risk assessment - see above
Noted that NEODyS has posted 2009 YG as an impact risk - see above
Grabbed MPEC 2009-Y25 - Daily Orbit Update - see above
Grabbed MPEC 2009-Y26 - 2008 CD22 - see above
Grabbed MPEC 2009-Y27 - 2009 YO - see above
Grabbed MPEC 2009-Y28 - 2009 YP - see above
Grabbed MPEC 2009-Y29 - 2009 YQ - see above