Last month the University of Wisconsin at Madison reported that pieces of the Mifflin Meteorite have been added to its Geology Museum collection of meteorites from around the state and elsewhere. Mifflin Township is where fragments were found after a spectacular atmospheric event in the evening of April 14th this year (news, video). Photo by Jeff Miller, courtesy of UW-M.
Contents on 21 December '10
- IAU Minor Planet Center
- Observers -- eight observers
- Impact Risk Monitoring -- one object
- Consolidated Risk Tables - the CRT page
Of 388 risk-listed objects, 350 have had news in the last 31 days. Updated at 1723 UTC on 21 Dec.
- Earth's Busy Neighborhood Traffic Report
Four objects are known to be within ten LD of Earth today. Updated at 1857 UTC on 21 Dec.
- 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 21 December '10
The MPC's NEO Confirmation Page has 1 listing: 1 new
When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new listing.
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 21 December '10
Minor Planet Electronic Circulars
As of last check at 2359 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
- K10X25C 2010 XC25 (arc=11 days, H=20.6 ~257m) from Astronomical Research Obs. Westfield (Dec. 19.41-42p3)
- Observations of recently (no longer) risk-listed objects
- K10W09D 2010 WD9 from ARO Westfield (Dec. 19.35-37p4)
- K10W08Z 2010 WZ8 (arc=20 days, H=20.5 ~269m) from ARO Westfield (Dec. 19.41-42p3)
- Observations of small asteroids (H>22.0)
- K10X58Z 2010 XZ58 (arc=6 days, H=23.5 ~68m) from ARO Westfield (Dec. 19.40-41p3)
- K10C44O 2010 CO44 (arc=18 days, H=24.6 ~41m) from ARO Westfield (March 5.12-13p2 at V=22.0-22.2 & 5.18p1 at V=22.3)
- Observations of almost-small asteroids (21.7<H<=22.0)
- K10M01S 2010 MS1 (arc=32 days, H=21.8 ~148m) from ARO Westfield (July 11.26-28p4)
- Observations of other objects
- K10X45R 2010 XR45 (Q=4.526 AU, arc=79 days, H=21.7 ~155m) from ARO Westfield (Dec. 19.14-16p5)
- K10X15C 2010 XC15 (arc=14 days, H=21.4 ~178m) from Castelmartini Obs. (Dec. 14.84p3)
- K10VD9X 2010 VX139 (arc=36 days, H=20.5 ~269m) from the Siding Spring Survey (SSS) (Dec. 20.53-54p2)
- K10T55P 2010 TP55 (arc=58 days, H=20.5 ~269m) from ARO Westfield (Oct. 29.32-34p3)
- K10T54K 2010 TK54 (arc=37 days, H=19.2 ~490m) from ARO Westfield (Oct. 29.23-26p3 at V=22.0-22.3)
- K10RH9R 2010 RR179 (Q=4.254 AU, arc=109 days, H=21.1 ~204m) from Modra Obs. (Dec. 20.71-72p2)
- K10J33L 2010 JL33 (Q=4.634 AU, arc=4 opp, H=17.6 ~1.02 km) from Castelmartini Obs. (Dec. 14.76p4), Hamamatsu-Yuto Obs. (Dec. 20.49-52p7 & 20.58-60p6), Modra Obs. (Dec. 20.78p3), and Atlante Obs. (Dec. 20.90-92p3)
- K08V14K 2008 VK14 (arc=3 opp, H=19.3 ~467m) from the Catalina Sky Survey (CSS) (Dec. 8.39-40p4)
- K06V14B 2006 VB14 (arc=3 opp, H=18.5 ~676m) from Hamamatsu-Yuto Obs. (Dec. 20.53-57p6)
- K03U11V 2003 UV11 from Indian Hill North Obs. (Oct. 28.21-23p6)
Observers on 21 December '10
Eight observers appear in today's MPEC.
|Code||Observer / observatory|
|H21||Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2010-Y20 -- 2010 XZ58, 2010 XR45, 2010 XC25, 2010 WZ8, 2010 WD9, 2010 TP55, 2010 TK54, 2010 MS1, 2010 CO44|
|J51||Atlante Obs. in the Canary Islands, 1 in MPEC 2010-Y20 -- 2010 JL33|
|160||Castelmartini Obs. in Italy, 2 in MPEC 2010-Y20 -- 2010 XC15, 2010 JL33|
|703||Catalina Sky Survey in Arizona, 1 in MPEC 2010-Y20 -- 2008 VK14|
|379||Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2010-Y20 -- 2010 JL33, 2006 VB14|
|H75||Indian Hill North Obs. in Ohio, 1 in MPEC 2010-Y20 -- 2003 UV11|
|118||Modra Obs. in Slovakia, 2 in MPEC 2010-Y20 -- 2010 RR179, 2010 JL33|
|E12||Siding Spring Survey in New South Wales, 1 in MPEC 2010-Y20 -- 2010 VX139|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 21 December '10
Notes for Today's Latest Risk Assessments
|2010 XC25||JPL Sentry||1722||2024-2104||19||9.6e-06||-2.86||-3.15||0||JPL: "Analysis based on 50 observations spanning 11.039 days (2010-Dec-08.37716 to 2010-Dec-19.416032)." Diameter approximately 0.257 km. from mean, weighted H=20.6.|
|NEODyS||1722||2043-2090||18||1.3e-05||-2.71||-3.04||0||NEODyS: "Based on 50 optical observations (of which 1 are rejected as outliers) from 2010-12-08.378 to 2010-12-19.417."|
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 December '10
Times are UTC for when items were noted or added by The Tracking News.
|1722||Noted that JPL Sentry has updated its 2010 XC25 risk assessment - see above|
Noted that NEODyS has updated its 2010 XC25 risk assessment - see above
Grabbed MPEC 2010-Y20 - Daily Orbit Update - see above