Contents on 21 April '08
- IAU Minor Planet Center
- Observers -- twelve observing facilities
- Impact Risk Monitoring -- one object
- Consolidated Risk Tables - the CRT page
- Earth's Busy Neighborhood Traffic Report
- Ephemerides for risk-rated and nearby objects
- Old & new CRT Archive
- Old News Archive & Small Objects Archive
NOTE: The Tracking News and this Web site will be updating less often, and at sometimes irregular intervals, for the rest of April.
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 21 April '08
The MPC's NEO Confirmation Page is currently empty
The NEOCP is currently empty. There were three listings noted earlier today.
New MPECs on 21 April '08
Minor Planet Electronic Circulars
As of last check at 2354 UTC, there have been two MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2008-H11 time-stamped "06:10 UT" - Daily Orbit Update - see below
- MPEC 2008-H12 time-stamped "11:08 UT" - 2008 HE
MPEC 2008-H12 - "11:08 UT" - 2008 HE
- K08H00E 2008 HE (q=0.118 AU, H=18.1 ~812m) was discovered at 0319 UT on 18 April by the Catalina Sky Survey (CSS), which observed it at April 18.14-23p8. The discovery was confirmed by Jim Young via Table Mtn. Obs. (April 18.20-21p4), Desert Moon Obs. (April 19.16-17p3), Sabino Canyon Obs. (April 19.27-28p3), Wildberg Obs. (April 19.81-82p3), Alter Satzberg Obs. (April 19.84-87p3), and Farra d'Isonzo Obs. (April 19.94-95p2).
- Observations of risk-listed objects
- K08GB0D 2008 GD110 (small asteroid, arc=7 days, H=24.5 ~43m) from Tiki Obs. (April 19.42-45p3) and Alter Satzberg Obs. (April 20.83-86p7)
- Observations of small asteroids (H>22.0)
- K08G20W 2008 GW20 (arc=5 days, H=22.1 ~129m) from Schiaparelli Obs. (April 13.08p3)
- Observations of other objects
- K08GB0J 2008 GJ110 (q=0.278 AU, arc=5 days, H=20.5 ~269m) from Jurassien-Vicques Obs. (April 19.86-87p2)
- K07VI3R 2007 VR183 (Q=4.353 AU, arc=220 days, H=17.4 ~1.12 km) from Greiner Research Obs. (GRO) (April 21.08-09p4)
- K05W01D 2005 WD1 (i=43.1°, arc=3 opp, H=16.4 ~1.78 km) from Tiki Obs. (April 20.59-65p3)
- K05N07B 2005 NB7 (arc=3 opp, H=18.7 ~616m) from Stammersdorf Obs. (April 20.88-90p4)
- F3591 153591 2001 SN263 from GRO (April 21.17p4)
- F2942 152942 2000 FN10 from Jurassien-Vicques Obs. (April 19.84-86p4)
Observers on 21 April '08
Twelve observing facilities appear in today's MPECs.
|Code||Observer / observatory|
|B03||Alter Satzberg Obs. in Austria, 2 in MPECs 2008-H11 & 2008-H12 -- 2008 HE, 2008 GD110|
|703||Catalina Sky Survey in Arizona, 1 in MPEC 2008-H12 -- 2008 HE|
|448||Desert Moon Obs. in New Mexico, 1 in MPEC 2008-H12 -- 2008 HE|
|595||Farra d'Isonzo Obs. in Italy, 1 in MPEC 2008-H12 -- 2008 HE|
|H51||Greiner Research Obs. (GRO) in Wisconsin, 2 in MPEC 2008-H11 -- 2007 VR183, 153591|
|185||Jurassien-Vicques Obs. in Switzerland, 2 in MPEC 2008-H11 -- 2008 GJ110, 152942|
|854||Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-H12 -- 2008 HE|
|204||Schiaparelli Obs. in Italy, 1 in MPEC 2008-H11 -- 2008 GW20|
|A97||Stammersdorf Obs. in Austria, 1 in MPEC 2008-H11 -- 2005 NB7|
|6735||Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-H12 -- 2008 HE|
|F85||Tiki Obs. in Tahiti, 2 in MPEC 2008-H11 -- 2008 GD110, 2005 WD1|
|198||Wildberg Obs. in Germany, 1 in MPEC 2008-H12 -- 2008 HE|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 21 April '08
Notes for Today's Latest Risk Assessments
|2008 GD110||JPL Sentry||1312||R E M O V E D||JPL: Risk listing removed at 0933 UTC.|
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 21 April '08
Times are UTC for when items were noted or added by The Tracking News.
|1312||Noted that JPL Sentry has removed 2008 GD110 as an impact risk - see above|
Grabbed MPEC 2008-H11 - Daily Orbit Update - see above
Grabbed MPEC 2008-H12 - 2008 HE - see above
The NEOCP has become empty