Contents  on 22 April '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 22 April '09

The MPC's NEO Confirmation Page has 10 listings: 4 new, 6 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four new and six updated listings. Of these, nine were "one nighters." So far The Tracking News has counted a total of thirteen 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 22 April '09

Minor Planet Electronic Circulars

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


MPEC 2009-H38 - "15:58 UT" - 2009 HJ36


MPEC 2009-H37 - "15:55 UT" - 2009 HH36


<< DOU on 22 Apr. '09 >>  MPEC 2009-H36 - "06:09 UT" - Daily Orbit Update

Observers  on 22 April '09

A total of 20 observing facilities appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2009-H36 -- 2009 HD
H55Astronomical Research Obs. (ARO) in Illinois, 2 in MPECs 2009-H37 & 2009-H38 -- 2009 HJ36, 2009 HH36
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2009-H36 -- 2009 DV42, 2001 GQ2, 198856, 163696, 163014, 4257
448Desert Moon Obs. in New Mexico, 3 in MPECs 2009-H36 & 2009-H37 -- 2009 HH36, 2004 HM1, 2002 FB6
113Drebach Obs. in Germany, 1 in MPEC 2009-H36 -- 2009 HD
I21El Condor Obs. in Argentina, 3 in MPEC 2009-H36 -- 2009 DL1, 2009 DE47, 2008 SV11
651Grasslands Obs. in Arizona, 1 in MPEC 2009-H37 -- 2009 HH36
J95Great Shefford Obs. in England, 4 in MPECs 2009-H36 & 2009-H37 -- 2009 HH36, 2009 HF21, 2009 HD21, 2009 HB21
046Klet Obs. in the Czech Republic, 3 in MPEC 2009-H36 -- 2009 HD, 2009 DE47, 2008 SV11
B12Koschny Obs. in The Netherlands, 2 in MPEC 2009-H36 -- 143651, 137805
704LINEAR in New Mexico, 10 in MPEC 2009-H36 -- 2009 HV2, 2009 HB21, 2009 FY29, 99935, 85938, 39557, 162900, 138127, 3102, 719
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2009-H37 -- 2009 HH36
474Mt. John Obs. in New Zealand, 1 in MPEC 2009-H37 -- 2009 HH36
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2009-H36, 2009-H37 & 2009-H38 -- 2009 HJ36, 2009 HH36, 2009 HF, 2009 HB, 2004 JR, 2000 UG11, 189008, 136874
A32Panker Obs. in Germany, 1 in MPEC 2009-H36 -- 2008 SV11
J41Raheny Obs. in Ireland, 1 in MPEC 2009-H36 -- 2009 HL21
H36Sandlot Obs. in Kansas, 1 in MPEC 2009-H37 -- 2009 HH36
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2009-H36 -- 2009 HG, 6053
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2009-H36 & 2009-H37 -- 2009 HH36, 2007 PA8, 2006 TK, 2005 SA71, 2004 JR, 2003 WO7, 2000 TG2
291Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2009-H36 & 2009-H37 -- 2009 HV2, 2009 HU2, 2009 HR2, 2009 HH36, 2009 HC, 2009 FF19, 2009 FF, 2009 DL46
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 April '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 HL21JPL Sentry12052024-21071031.5e-07-5.58-6.500JPL #2 for the day: "Analysis based on 33 observations spanning .99878 days (2009-Apr-20.92262 to 2009-Apr-21.9214)." Diameter approximately 0.110 km. from mean, weighted H=22.4.
NEODyS12052030-2090222.97e-09-7.28-8.170NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2009/04/20.923 to 2009/04/21.922."
2009 HD21JPL Sentry12052013-21081934.3e-07-2.50-2.800JPL: "Analysis based on 25 observations spanning 1.6658 days (2009-Apr-20.32627 to 2009-Apr-21.99209)." Diameter approximately 0.779 km. from mean, weighted H=18.2.
NEODyS12052013-20901031.88e-07-2.75-2.910NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2009/04/20.327 to 2009/04/21.993."
2009 HA21NEODyS12052032-205831.13e-10-6.76-6.920NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2009/04/20.250 to 2009/04/21.206."
2009 HU2JPL Sentry12052054-205841.4e-08-4.50-4.950JPL: "Analysis based on 30 observations spanning 2.1859 days (2009-Apr-19.13168 to 2009-Apr-21.31757)." Diameter approximately 0.799 km. from mean, weighted H=18.1.
NEODyS12052038-2066164.87e-08-3.98-4.490NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2009/04/19.132 to 2009/04/21.318."
2009 HCJPL Sentry12052097-210859.4e-07-6.44-6.830JPL: "Analysis based on 50 observations spanning 4.1274 days (2009-Apr-17.23164 to 2009-Apr-21.35907)." Diameter approximately 0.036 km. from mean, weighted H=24.9.

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 22 April '09

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

1600Grabbed MPEC 2009-H37 - 2009 HH36 - see above
Grabbed MPEC 2009-H38 - 2009 HJ36 - see above
1205Noted that NEODyS has posted 2009 HA21 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 HC risk assessment - see above
Noted that JPL Sentry has updated its 2009 HD21 risk assessment - see above
Noted that NEODyS has posted 2009 HD21 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 HL21 risk assessment - see above
Noted that NEODyS has posted 2009 HL21 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 HU2 risk assessment - see above
Noted that NEODyS has updated its 2009 HU2 risk assessment - see above
Grabbed MPEC 2009-H36 - Daily Orbit Update - see above
0106Noted that JPL Sentry has posted 2009 HL21 as an impact risk - see above