Contents  on 23 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 23 April '09

The MPC's NEO Confirmation Page has 8 listings: 1 new, 7 updated

When last checked at 2346 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and seven updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of fifteen 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 23 April '09

Minor Planet Electronic Circulars

As of last check at 2346 UTC, there have been twelve MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2009-H50 - "22:39 UT" - Comet C/2009 G1 (STEREO)


MPEC 2009-H49 - "16:36 UT" - 2009 HW44


MPEC 2009-H48 - "16:33 UT" - 2009 HV44


MPEC 2009-H47 - "16:26 UT" - 2009 HU44


MPEC 2009-H46 - "16:17 UT" - 2009 HS44


MPEC 2009-H45 - "15:31 UT" - Observations of Comets


MPEC 2009-H44 - "15:21 UT" - Comet C/2009 F6 (Yi-SWAN)


MPEC 2009-H43 - "15:17 UT" - Comet C/2009 F5 (McNaught)


MPEC 2009-H42 - "15:13 UT" - Comet C/2009 F4 (McNaught)


MPEC 2009-H41 - "15:09 UT" - Comet C/2009 F2 (McNaught)


MPEC 2009-H40 - "15:01 UT" - Comet C/2009 E1 (Itagaki)


<< DOU on 23 Apr. '09 >>  MPEC 2009-H39 - "06:09 UT" - Daily Orbit Update

Observers  on 23 April '09

A total of 65 observing facilities appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 2 in MPECs 2009-H45 & 2009-H50 -- C/2009 G1, P/2008 Y1
J10Alicante Obs. in Spain, 3 in MPEC 2009-H45 -- C/2008 A1, C/2006 OF2, 29P
H55Astronomical Research Obs. (ARO) in Illinois, 14 in MPECs 2009-H39, 2009-H46, 2009-H47, 2009-H48 & 2009-H49 -- 2009 HW44, 2009 HV44, 2009 HU44, 2009 HU2, 2009 HS44, 2009 HL21, 2009 HE, 2009 HD21, 2009 HC, 2009 HB21, 2009 FT, 2009 DF1, 2008 WL60, 159399
J51Atlante Obs. in the Canary Islands, 9 in MPECs 2009-H39, 2009-H43 & 2009-H45 -- C/2009 F5, C/2008 FK75, C/2006 U6, C/2005 L3, 175706, 116P, 88P, 77P, 74P
A74Bergen-Enkheim Obs. in Germany, 3 in MPEC 2009-H39 -- 2009 HL21, 2009 HD21, 37655
I32Beta Orionis Obs. in Argentina, 1 in MPEC 2009-H43 -- C/2009 F5
B59Borken Obs. in Germany, 3 in MPEC 2009-H45 -- C/2008 Q1, C/2006 Q1, 65P
215Buchloe Obs. in Germany, 1 in MPEC 2009-H45 -- P/2008 Y3
160Castelmartini Obs. in Italy, 1 in MPEC 2009-H45 -- C/2006 Q1
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2009-H39 & 2009-H45 -- C/2009 B2, C/2008 Q1, C/2006 U6, 184990, 1864
A77Chante-Perdrix Obs. in France, 3 in MPEC 2009-H45 -- C/2008 FK75, C/2007 M1, 77P
850Cordell-Lorenz Obs. in Tennessee, 3 in MPECs 2009-H45 & 2009-H48 -- 2009 HV44, C/2008 T2, C/2007 N3
448Desert Moon Obs. in New Mexico, 3 in MPEC 2009-H39 -- 2009 FG1, 2005 RD1, 2002 LV
639Dresden Obs. in Germany, 2 in MPEC 2009-H39 -- 2009 HD, 2009 CQ1
I21El Condor Obs. in Argentina, 1 in MPEC 2009-H39 -- 2005 SG19
808El Leoncito Obs. in Argentina, 2 in MPECs 2009-H43 & 2009-H45 -- C/2009 F5, C/2006 U6
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2009-H45 -- C/2008 Q3
442Gualba Obs. in Spain, 4 in MPEC 2009-H45 -- C/2007 N3, 116P, 65P, 29P
379Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2009-H39 -- 2009 DE47, 2008 WL60, 2008 SV11, 2007 BT2
B15Inastars Obs. in Germany, 1 in MPEC 2009-H45 -- C/2006 Q1
987Isle of Man Obs. on the Isle of Man, 3 in MPEC 2009-H45 -- C/2008 A1, C/2006 Q1, 65P
415Kambah Obs. in the Australian Capital Territory, 4 in MPECs 2009-H41, 2009-H42, 2009-H43 & 2009-H45 -- C/2009 F5, C/2009 F4, C/2009 F2, C/2008 Q3
585Kiev Comet Station in the Ukraine, 9 in MPECs 2009-H40, 2009-H42, 2009-H43, 2009-H44 & 2009-H45 -- C/2009 F6, C/2009 F5, C/2009 F4, C/2009 E1, C/2007 N3, 77P, 67P, 65P, 29P
046Klet Obs. in the Czech Republic, 3 in MPECs 2009-H40, 2009-H43 & 2009-H45 -- C/2009 F5, C/2009 E1, C/2008 Q1
704LINEAR in New Mexico, 13 in MPECs 2009-H39, 2009-H45, 2009-H47 & 2009-H48 -- 2009 HV44, 2009 HU44, 2006 WZ2, C/2006 OF2, 85953, 142781, 4179, 1863, 116P, 88P, 77P, 65P, 29P
J31La Axarquia Obs. in Spain, 1 in MPEC 2009-H45 -- C/2006 OF2
212La Dehesilla Obs. in Spain, 2 in MPEC 2009-H45 -- 88P, 65P
J75La Sagra Obs. in Spain, 4 in MPEC 2009-H39 -- 2003 UN12, 89958, 177614, 143947
J38La Vara Obs. in Spain, 12 in MPEC 2009-H45 -- C/2008 T2, C/2007 N3, C/2006 Q1, C/2006 OF2, C/2005 L3, 144P, 116P, 77P, 74P, 67P, 65P, 29P
I36Los Campitos Obs. in Argentina, 1 in MPEC 2009-H41 -- C/2009 F2
B82Maidbronn Obs. in Germany, 10 in MPECs 2009-H44 & 2009-H45 -- C/2009 F6, C/2008 T2, C/2006 OF2, C/2005 L3, 144P, 116P, 77P, 65P, 29P, 19P
J40Malaga Obs. in Spain, 7 in MPEC 2009-H45 -- C/2008 N1, C/2007 N3, C/2006 U6, C/2006 Q1, C/2005 L3, 67P, 29P
A99Monte Baldo Obs. in Italy, 1 in MPEC 2009-H39 -- 2009 HL21
945Monte Deva Obs. in Spain, 9 in MPEC 2009-H45 -- C/2008 T2, C/2007 N3, C/2006 Q1, C/2006 OF2, C/2005 L3, 144P, 116P, 67P, 65P
900Moriyama Obs. in Japan, 1 in MPEC 2009-H45 -- 77P
474Mt. John Obs. in New Zealand, 13 in MPECs 2009-H39, 2009-H46, 2009-H47, 2009-H48 & 2009-H49 -- 2009 HW44, 2009 HW2, 2009 HV44, 2009 HU44, 2009 HS44, 2009 HG21, 2009 HG, 2009 HF21, 2009 HE21, 2009 HC21, 2006 TK, 2005 HN3, 2004 QB17
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2009-H39, 2009-H45, 2009-H46, 2009-H47, 2009-H48 & 2009-H49 -- 2009 HW44, 2009 HV44, 2009 HU44, 2009 HS44, 2008 EN82, C/2006 OF2, 138911
A13Naef Obs. in Switzerland, 2 in MPEC 2009-H45 -- C/2008 Q1, 210P
D81Nagano Obs. in Japan, 1 in MPEC 2009-H44 -- C/2009 F6
J47Nazaret Obs. in Spain, 22 in MPECs 2009-H42 & 2009-H45 -- C/2009 F4, C/2009 B2, C/2008 T2, C/2008 Q1, C/2007 N3, C/2007 D1, C/2006 U6, C/2006 Q1, C/2006 OF2, C/2005 L3, 210P, 144P, 143P, 116P, 88P, 77P, 74P, 67P, 65P, 59P, 29P, 19P
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2009-H39 -- 175706
A32Panker Obs. in Germany, 13 in MPECs 2009-H40, 2009-H44 & 2009-H45 -- C/2009 F6, C/2009 E1, C/2008 T2, C/2007 N3, C/2006 OF2, C/2005 L3, 144P, 88P, 67P, 65P, 59P, 29P, 19P
A53Peschiera del Garda Obs. in Italy, 3 in MPEC 2009-H39 -- 2009 HL21, 2008 WL60, 2007 BT2
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 3 in MPEC 2009-H45 -- 88P, 65P, 19P
J53Posadas Obs. in Spain, 12 in MPEC 2009-H45 -- C/2007 N3, C/2006 U6, C/2005 L3, 144P, 143P, 116P, 88P, 77P, 74P, 65P, 29P, 19P
H06%Ernesto Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2009-H48 -- 2009 HV44
D90RAS Obs. Moorook in South Australia, 1 in MPEC 2009-H50 -- C/2009 G1
J41Raheny Obs. in Ireland, 4 in MPEC 2009-H39 -- 2009 HL21, 2009 HD, 2008 WL60, 3103
473Remanzacco Obs. in Italy, 1 in MPEC 2009-H45 -- C/2009 B2
939Rodeno Obs. in Spain, 12 in MPEC 2009-H45 -- C/2008 T2, C/2007 N3, C/2006 Q1, C/2006 OF2, C/2005 L3, 144P, 116P, 77P, 74P, 67P, 65P, 29P
461SZTE Asteroid Program (SZTE) in Hungary, 5 in MPEC 2009-H45 -- C/2007 N3, C/2007 K1, C/2007 D3, C/2007 D1, C/2005 L3
H36Sandlot Obs. in Kansas, 1 in MPEC 2009-H45 -- C/2007 K1
B70Sant Celoni Obs. in Spain, 1 in MPEC 2009-H45 -- C/2006 Q1
204Schiaparelli Obs. in Italy, 3 in MPEC 2009-H45 -- P/2008 Y1, C/2008 N1, 173P
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2009-H39 & 2009-H42 -- C/2009 F4, 2009 DL1
510Siegen Obs. in Germany, 6 in MPECs 2009-H39, 2009-H44 & 2009-H45 -- 2009 HL21, C/2009 F6, 2008 WL60, C/2008 Q1, C/2006 Q1, 67P
691Spacewatch 0.9m telescope in Arizona, 8 in MPECs 2009-H39 & 2009-H45 -- 2009 HV2, P/2008 CL94, 2007 PA8, 2007 HF44, 1999 TN12, 99799, 207P, 88P
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2009-H39 & 2009-H45 -- 2009 HC, 2009 DL46, P/2008 Y3, P/2005 SB216, 213P, 207P, 173P
A97Stammersdorf Obs. in Austria, 3 in MPEC 2009-H45 -- C/2007 N3, 116P, 65P
6735Jim Young via Table Mtn. Obs. in southern California, 2 in MPECs 2009-H47 & 2009-H48 -- 2009 HV44, 2009 HU44
J26The Spaceguard Centre in Wales, 1 in MPEC 2009-H44 -- C/2009 F6
H53Thompsonville Obs. in Illinois, 4 in MPECs 2009-H39 & 2009-H45 -- C/2008 T2, 175706, 143651, 5604
H10Tzec Maun Obs. Mayhill in New Mexico, 3 in MPEC 2009-H45 -- C/2007 M1, 88P, 65P
H47Vicksburg Obs. in Mississippi, 9 in MPEC 2009-H45 -- C/2006 Q1, C/2005 L3, 144P, 116P, 88P, 77P, 74P, 65P, 19P
B42Vitebsk Obs. in Belarus, 8 in MPEC 2009-H45 -- C/2008 Q1, C/2006 Q1, C/2005 L3, 88P, 77P, 65P, 19P, 10P
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 April '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2355 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 Sentry1332R E M O V E DJPL: Risk listing removed at 0852 UTC.
NEODyS1332R E M O V E D-
2009 HD21JPL Sentry13322013-2106874.3e-07-2.66-3.230JPL: "Analysis based on 31 observations spanning 2.5782 days (2009-Apr-20.32627 to 2009-Apr-22.90446)." Diameter approximately 0.809 km. from mean, weighted H=18.1.
NEODyS13322013-2090431.69e-07-2.97-3.360NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2009/04/20.327 to 2009/04/22.905."
2009 HU2JPL Sentry1332R E M O V E DJPL: Risk listing removed at 0851 UTC.
NEODyS1332R E M O V E D-
2009 HEJPL Sentry1332R E M O V E DJPL: Risk listing removed at 0852 UTC.
2009 HCJPL Sentry13322097-209837.5e-07-6.54-6.930JPL: "Analysis based on 56 observations spanning 5.1864 days (2009-Apr-17.23164 to 2009-Apr-22.41806)." 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 23 April '09

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

2258Grabbed MPEC 2009-H50 - Comet C/2009 G1 (STEREO) - see above
1705Grabbed MPEC 2009-H48 - 2009 HV44 - see above
Grabbed MPEC 2009-H49 - 2009 HW44 - see above
1634Grabbed MPEC 2009-H46 - 2009 HS44 - see above
Grabbed MPEC 2009-H47 - 2009 HU44 - see above
1600Grabbed MPEC 2009-H40 - Comet C/2009 E1 (Itagaki) - see above
Grabbed MPEC 2009-H41 - Comet C/2009 F2 (McNaught) - see above
Grabbed MPEC 2009-H42 - Comet C/2009 F4 (McNaught) - see above
Grabbed MPEC 2009-H43 - Comet C/2009 F5 (McNaught) - see above
Grabbed MPEC 2009-H44 - Comet C/2009 F6 (Yi-SWAN) - see above
Grabbed MPEC 2009-H45 - Observations of Comets - see above
1332Noted 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 updated its 2009 HD21 risk assessment - see above
Noted that JPL Sentry has removed 2009 HE as an impact risk - see above
Noted that JPL Sentry has removed 2009 HL21 as an impact risk - see above
Noted that NEODyS has removed 2009 HL21 as an impact risk - see above
Noted that JPL Sentry has removed 2009 HU2 as an impact risk - see above
Noted that NEODyS has removed 2009 HU2 as an impact risk - see above
Grabbed MPEC 2009-H39 - Daily Orbit Update - see above