Contents  on 26 April '08

Resources:

NOTE: The Tracking News and this Web site will be updating less often, and at sometimes irregular intervals, for the rest of April.

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 26 April '08

The MPC's NEO Confirmation Page has 5 listings: 1 new, 4 updated

When last checked at 2339 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and four updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of six objects listed on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object by Birtwhistle et al. at Suno Observatory.

New MPECs  on 26 April '08

Minor Planet Electronic Circulars

As of last check at 2339 UTC, there have been five MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2008-H32 - "15:27 UT" - 2008 HL


MPEC 2008-H31 - "15:22 UT" - Observations of Comets


MPEC 2008-H30 - "15:08 UT" - Comet C/2008 H1 (LINEAR)


MPEC 2008-H29 - "14:59 UT" - Comet C/2008 G1 (Gibbs)


<< DOU on 26 Apr. '08 >>  MPEC 2008-H28 - "06:06 UT" - Daily Orbit Update

Observers  on 26 April '08

A total of 49 observing facilities appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 8 in MPECs 2008-H30 & 2008-H31 -- C/2008 H1, C/2007 M2, C/2007 B2, C/2006 S5, C/2006 Q1, 29P, 26P, 17P
B37Ametlla del Valles Obs. in Spain, 1 in MPEC 2008-H31 -- C/2002 VQ94
H55Astronomical Research Obs. (ARO) in Illinois, 30 in MPEC 2008-H28 -- 2008 GX21, 2008 GX, 2008 GV20, 2008 GU20, 2008 GJ110, 2008 GH110, 2008 GG2, 2008 GE110, 2008 GC110, 2008 GB110, 2008 GA110, 2008 FW5, 2008 FN, 2008 EX84, 2008 ER, 2008 EE, 2008 CR118, 2008 CL72, 2008 CD22, 2007 MK13, 2005 XE1, 2004 XN44, 2004 BL86, 2003 AD1, 2002 GF1, 2001 HY7, 2000 ER70, 1999 FA, 1998 KG3, 184990
J51Atlante Obs. in the Canary Islands, 6 in MPECs 2008-H30 & 2008-H31 -- C/2008 H1, C/2007 W1, C/2007 M2, C/2007 B2, C/2006 Q1, C/2005 L3
467Auckland Obs. in New Zealand, 5 in MPEC 2008-H31 -- C/2007 W1, C/2006 Q1, C/2006 K4, 26P, 8P
B59Borken Obs. in Germany, 1 in MPEC 2008-H31 -- C/2005 L3
215Buchloe Obs. in Germany, 1 in MPEC 2008-H31 -- 194P
J79Calarreona Obs. in Spain, 3 in MPEC 2008-H31 -- C/2007 W1, C/2007 M2, C/2007 B2
B09Capannoli Obs. in Italy, 2 in MPEC 2008-H28 -- 184266, 5836
B20Carmelita Obs. in Spain, 3 in MPECs 2008-H30 & 2008-H31 -- C/2008 H1, C/2007 B2, 180P
703Catalina Sky Survey (CSS) in Arizona, 14 in MPECs 2008-H28 & 2008-H31 -- C/2007 M2, C/2006 S5, 2003 GW, C/2002 VQ94, 24445, 102873, 5626, 4954, 4503, 3554, 3288, 180P, 172P, 124P
B24Cesson Obs. in France, 1 in MPEC 2008-H31 -- C/2008 C1
A77Chante-Perdrix Obs. in France, 3 in MPEC 2008-H31 -- C/2007 W1, C/2007 B2, 46P
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2008-H29 -- C/2008 G1
E85Farm Cove Obs., 2 in MPEC 2008-H31 -- C/2007 W1, C/2007 M2
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2008-H30 -- C/2008 H1
442Gualba Obs. in Spain, 1 in MPEC 2008-H31 -- 29P
B19Iluro Obs. in Spain, 9 in MPECs 2008-H28, 2008-H30 & 2008-H31 -- C/2008 H1, 2008 GV3, C/2007 G1, C/2007 B2, C/2005 L3, 86667, 35107, 184266, 1866
585Kiev Comet Station in the Ukraine, 2 in MPEC 2008-H31 -- C/2008 C1, C/2007 W1
352Konan Obs. in Japan, 3 in MPEC 2008-H31 -- C/2007 W1, C/2006 Q1, 124P
704LINEAR in New Mexico, 7 in MPEC 2008-H31 -- C/2007 M2, C/2007 B2, C/2006 S5, C/2005 L3, 194P, 65P, 26P
J31La Axarquia Obs. in Spain, 2 in MPEC 2008-H31 -- P/2008 G2, C/2005 L3
J38La Vara Obs. in Spain, 5 in MPEC 2008-H31 -- C/2007 W1, C/2007 B2, C/2006 S5, 46P, 7P
B57Laietania Obs. in Spain, 1 in MPEC 2008-H31 -- 46P
J59Linceo Obs. in Spain, 2 in MPEC 2008-H31 -- C/2007 W1, C/2007 B2
J40Malaga Obs. in Spain, 6 in MPECs 2008-H30 & 2008-H31 -- C/2008 H1, C/2007 W1, C/2007 M2, C/2007 B2, C/2006 S5, C/2006 Q1
232Masquefa Obs. in Spain, 4 in MPECs 2008-H30 & 2008-H31 -- C/2008 H1, C/2007 G1, C/2007 B2, C/2005 L3
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-H28 -- 2004 XN44
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2008-H30 -- C/2008 H1
213Montcabre Obs. in Spain, 7 in MPECs 2008-H29, 2008-H30 & 2008-H31 -- C/2008 H1, P/2008 G2, C/2008 G1, C/2007 W1, C/2006 Q1, 46P, 7P
945Monte Deva Obs. in Spain, 2 in MPEC 2008-H31 -- C/2007 W1, C/2005 L3
900Moriyama Obs. in Japan, 11 in MPECs 2008-H30 & 2008-H31 -- C/2008 H1, C/2008 C1, C/2007 W1, C/2007 M2, C/2007 B2, C/2006 S5, C/2006 Q1, C/2005 L3, 180P, 124P, 46P
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2008-H28, 2008-H31 & 2008-H32 -- 2008 HL, 2008 FT6, P/2007 T4, 2004 NC9, 68063, 34613, 137170, 11054, 4503, 1864, 124P
J47Nazaret Obs. in Spain, 4 in MPECs 2008-H30 & 2008-H31 -- C/2008 H1, C/2007 W1, 46P, 17P
J29Nira Obs. in Spain, 2 in MPECs 2008-H30 & 2008-H31 -- C/2008 H1, 172P
B49Paus Obs. in Spain, 2 in MPECs 2008-H29 & 2008-H31 -- C/2008 G1, C/2002 VQ94
A53Peschiera del Garda Obs. in Italy, 4 in MPEC 2008-H28 -- 2008 GV3, 2008 EE85, 2007 VQ4, 2006 BG55
H06RAS Obs. Mayhill in New Mexico, 2 in MPEC 2008-H31 -- C/2007 B2, 26P
D90RAS Obs. Moorook in South Australia, 1 in MPEC 2008-H31 -- 8P
473Remanzacco Obs. in Italy, 2 in MPEC 2008-H31 -- P/2008 G2, C/2007 B2
939Rodeno Obs. in Spain, 8 in MPEC 2008-H31 -- C/2008 C1, C/2007 W1, C/2007 G1, C/2007 B2, C/2005 L3, 65P, 46P, 29P
B61Sant Cugat del Valles Obs. in Spain, 1 in MPEC 2008-H31 -- 180P
204Schiaparelli Obs. in Italy, 2 in MPEC 2008-H31 -- P/2007 T4, C/2005 L3
510Siegen Obs. in Germany, 1 in MPEC 2008-H30 -- C/2008 H1
291Spacewatch 1.8m telescope in Arizona, 17 in MPECs 2008-H28 & 2008-H32 -- 2008 HL, 2008 HH, 2008 HG, 2008 GH, 2008 GG2, 2008 GF, 2008 GE1, 2008 GA4, 2008 GA110, 2008 FW5, 2008 FF5, 2008 EL6, 2008 EB9, 2008 EA9, 2008 DJ5, 2004 LE, 2000 QW7
A97Stammersdorf Obs. in Austria, 2 in MPEC 2008-H31 -- C/2008 C1, 46P
629Szeged Obs. in Hungary, 3 in MPEC 2008-H31 -- C/2008 C1, 46P, 29P
J70Vega del Thader Obs. in Spain, 3 in MPEC 2008-H31 -- C/2007 W1, C/2007 B2, 26P
B42Vitebsk Obs. in Belarus, 5 in MPECs 2008-H30 & 2008-H31 -- C/2008 H1, C/2005 L3, 180P, 124P, 46P
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 April '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2339 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.
Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090.
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
2008 HJNEODyS12242071-2090107.51e-06-5.65-5.860NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2008/04/24.248 to 2008/04/25.816."
2008 HHJPL Sentry12242016-2106781.3e-07-5.11-5.720JPL: "Analysis based on 17 observations spanning .99843 days (2008-Apr-24.30829 to 2008-Apr-25.30672)." Diameter approximately 0.140 km. from mean, weighted H=21.9.
NEODyS12242011-2090564.19e-07-4.29-4.580NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2008/04/24.309 to 2008/04/25.307."
2008 GHNEODyS1224R E M O V E D-
2008 FF5JPL Sentry1224206013.6e-07-4.91-4.910JPL: "Analysis based on 52 observations spanning 10.849 days (2008-Mar-28.32219 to 2008-Apr-08.17156)." Diameter approximately 0.081 km. from mean, weighted H=23.1.
NEODyS1224206013.51e-07-4.92-4.920NEODyS: "Based on 52 optical observations (of which 0 are rejected as outliers) from 2008/03/28.323 to 2008/04/08.172."
2008 EA9JPL Sentry12242068-210382.5e-05-6.32-6.860JPL: "Analysis based on 58 observations spanning 27.860 days (2008-Mar-06.40551 to 2008-Apr-03.26595)." Diameter approximately 0.010 km. from mean, weighted H=27.7.
NEODyS12242061-2089203.79e-05-6.11-6.600NEODyS: "Based on 59 optical observations (of which 1 are rejected as outliers) from 2008/03/06.406 to 2008/04/03.267."
2004 FU162JPL Sentry00242009-21048206.2e-05-5.43-6.370JPL: "Analysis based on 4 observations spanning .03055 days (2004-Mar-31.27744 to 2004-Mar-31.30799)." Diameter approximately 0.006 km. from mean, weighted H=28.9.

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 26 April '08

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

1615Grabbed MPEC 2008-H29 - Comet C/2008 G1 (Gibbs) - see above
Grabbed MPEC 2008-H30 - Comet C/2008 H1 (LINEAR) - see above
Grabbed MPEC 2008-H31 - Observations of Comets - see above
Grabbed MPEC 2008-H32 - 2008 HL - see above
1224Noted that JPL Sentry has updated its 2008 EA9 risk assessment - see above
Noted that NEODyS has updated its 2008 EA9 risk assessment - see above
Noted that JPL Sentry has updated its 2008 FF5 risk assessment - see above
Noted that NEODyS has updated its 2008 FF5 risk assessment - see above
Noted that NEODyS has removed 2008 GH as an impact risk - see above
Noted that JPL Sentry has updated its 2008 HH risk assessment - see above
Noted that NEODyS has updated its 2008 HH risk assessment - see above
Noted that NEODyS has posted 2008 HJ as an impact risk - see above
Grabbed MPEC 2008-H28 - Daily Orbit Update - see above
0024Noted that JPL Sentry has updated its 2004 FU162 risk assessment - see above