Contents on 22 February '11
- IAU Minor Planet Center
- Observers -- four observers
- Impact Risk Monitoring -- one object
- Consolidated Risk Tables - the CRT page
Of 412 risk-listed objects, 60 have had news in the last 28 days. Updated at 1637 UTC on 22 Feb.
- Earth's Busy Neighborhood Traffic Report
Two objects are known to be within ten LD of Earth today. Updated at 1850 UTC on 22 Feb.
- Ephemerides for risk-rated and nearby objects
- News image catalog
- Old & new CRT Archive
- Old News Archive & Small Objects Archive
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 February '11
The MPC's NEO Confirmation Page has 3 listings: 1 new, 2 updated
When last checked at 2300 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and two updated listings. Of these, two were "one nighters."
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 February '11
Minor Planet Electronic Circulars
As of last check at 2300 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- Observations of risk-listed objects
- K11B15T 2011 BT15 (almost small, arc=29 days, H=21.9 ~141m) from the Spacewatch 1.8m telescope (Feb. 22.16-17p3)
- Observations of recently (no longer) risk-listed objects
- K11C04Q 2011 CQ4 (arc=21 days, H=18.2 ~776m) from Spacewatch 1.8m (Feb. 22.13-14p3)
- K11B45B 2011 BB45 (arc=23 days, H=19.3 ~467m) from Spacewatch 1.8m (Feb. 22.21-22p3)
- K11B39F 2011 BF39 (small asteroid, Q=4.033 AU, arc=13 days, H=24.5 ~43m) from Astronomical Research Obs. Westfield (Feb. 8.18-19p3)
- Observations of small asteroids (H>22.0)
- K11B59Y 2011 BY59 (arc=23 days, H=22.5 ~107m) from Spacewatch 1.8m (Feb. 22.22-23p3)
- Observations of other objects
- K11C02O 2011 CO2 (arc=21 days, H=18.5 ~676m) from Spacewatch 1.8m (Feb. 22.15p3)
- K11C02G 2011 CG2 (arc=18 days, H=21.3 ~186m) from Hamamatsu-Yuto Obs. (Feb. 21.52-56p5)
- K11B45A 2011 BA45 (arc=23 days, H=21.5 ~170m) from Spacewatch 1.8m (Feb. 22.20p2)
- K11B00B 2011 BB (Q=4.249 AU, arc=40 days, H=20.4 ~282m) from Sandlot Obs. (Feb. 22.07-09p2)
- K10G07R 2010 GR7 (q=0.281 AU, arc=2 opp, H=18.4 ~708m) from ARO Westfield (Feb. 10.30-35p3 at V=22.2-5)
- K09D42V 2009 DV42 (arc=3 opp, H=18.5 ~676m) from ARO Westfield (Feb. 19.29-30p4)
- K01V05K 2001 VK5 (arc=6 opp, H=17.8 ~933m) from ARO Westfield (Feb. 19.27-29p3)
- 05587 5587 1990 SB from ARO Westfield (Feb. 19.14-15p3)
Observers on 22 February '11
Four observers appear in today's MPEC.
|Code||Observer / observatory|
|H21||Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2011-D22 -- 2011 BF39, 2010 GR7, 2009 DV42, 2001 VK5, 5587|
|379||Hamamatsu-Yuto Obs. in Japan, 1 in MPEC 2011-D22 -- 2011 CG2|
|H36||Sandlot Obs. in Kansas, 1 in MPEC 2011-D22 -- 2011 BB|
|291||Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2011-D22 -- 2011 CQ4, 2011 CO2, 2011 BY59, 2011 BT15, 2011 BB45, 2011 BA45|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 22 February '11
Notes for Today's Latest Risk Assessments
|2011 BT15||JPL Sentry||1637||2037-2110||107||9.4e-05||-2.87||-3.82||0||JPL: "Analysis based on 42 observations spanning 28.883 days (2011-Jan-24.28933 to 2011-Feb-22.17258)." Diameter approximately 0.140 km. from mean, weighted H=21.9.|
|NEODyS||1637||2037-2090||65||3.87e-05||-3.18||-3.77||0||NEODyS: "Based on 43 optical observations (of which 3 are rejected as outliers) from 2011-01-24.290 to 2011-02-22.173."|
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 February '11
Times are UTC for when items were noted or added by The Tracking News.
|1637||Noted that JPL Sentry has updated its 2011 BT15 risk assessment - see above|
Noted that NEODyS has updated its 2011 BT15 risk assessment - see above
Grabbed MPEC 2011-D22 - Daily Orbit Update - see above
Noted that the NEOCP has become active