Contents on 23 December '08
- IAU Minor Planet Center
- Observers -- five observing facilities
- Impact Risk Monitoring -- four objects
- 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
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 December '08
The MPC's NEO Confirmation Page has 3 listings: 3 updated
When last checked at 2300 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three updated listings. Of these, two 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 23 December '08
Minor Planet Electronic Circulars
As of last check at 2300 UTC, there have been five MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2008-Y44 time-stamped "00:40 UT" - 2005 CS6 - see below
- MPEC 2008-Y45 time-stamped "04:42 UT" - 2005 SG19 - see below
- MPEC 2008-Y46 time-stamped "04:48 UT" - 2008 CL1 - see below
- MPEC 2008-Y47 time-stamped "07:06 UT" - Daily Orbit Update - see below
- MPEC 2008-Y48 time-stamped "12:10 UT" - 2008 YJ3
MPEC 2008-Y48 - "12:10 UT" - 2008 YJ3
- K08Y03J 2008 YJ3 (risk-listed, H=20.2 ~309m) was discovered at 0624 UT on 22 Dec. by the Spacewatch 1.8m telescope, which observed it at Dec. 22.27-31p6. The discovery was confirmed by Sabino Canyon Obs. (Dec. 22.33-34p3), Calar Alto Obs. (Dec. 22.85-86p4), Saint-Barthelemy Obs. (Dec. 22.97-00p5), and Mt. John Obs. (Dec. 23.47p3).
No observations of objects are reported.
MPEC 2008-Y46 - "04:48 UT" - 2008 CL1
- K08C01L 2008 CL1 (H=19.5 ~426m) from Calar Alto Obs. (Dec. 22.18-19p3 & 23.15-17p3)
MPEC 2008-Y45 - "04:42 UT" - 2005 SG19
- K05S19G 2005 SG19 (Q=4.171 AU, H=16.9 ~1.41 km) from Calar Alto Obs. (Dec. 22.17-18p3 & 23.14-15p3)
MPEC 2008-Y44 - "00:40 UT" - 2005 CS6
- K05C06S 2005 CS6 (Q=4.053 AU, H=18.0 ~851m) from Calar Alto Obs. (Dec. 22.20-22p3 & 22.97-99p3)
Observers on 23 December '08
Five observing facilities appear in today's MPECs.
|Code||Observer / observatory|
|493||Calar Alto Obs. in Spain, 4 in MPECs 2008-Y44, 2008-Y45, 2008-Y46 & 2008-Y48 -- 2008 YJ3, 2008 CL1, 2005 SG19, 2005 CS6|
|474||Mt. John Obs. in New Zealand, 1 in MPEC 2008-Y48 -- 2008 YJ3|
|854||Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-Y48 -- 2008 YJ3|
|B04||Saint-Barthelemy Obs. in Italy, 1 in MPEC 2008-Y48 -- 2008 YJ3|
|291||Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2008-Y48 -- 2008 YJ3|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 23 December '08
Notes for Today's Latest Risk Assessments
|2008 YJ3||JPL Sentry||1459||2027-2108||98||2.7e-07||-3.96||-4.93||0||JPL: "Analysis based on 21 observations spanning 1.2072 days (2008-Dec-22.26734 to 2008-Dec-23.47454)." Diameter approximately 0.328 km. from mean, weighted H=20.1.|
|2008 YD3||NEODyS||1459||2022||1||4.9e-10||-9.27||-9.27||0||NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2008/12/22.343 to 2008/12/22.486."|
|2008 YC3||NEODyS||1459||2053-2090||56||3.34e-04||-3.78||-4.01||0||NEODyS: "Based on 13 optical observations (of which 1 are rejected as outliers) from 2008/12/22.254 to 2008/12/22.757."|
|2008 YO2||NEODyS||1459||2052-2089||11||2.2e-06||-5.75||-5.91||0||NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2008/12/21.166 to 2008/12/22.168."|
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 December '08
Times are UTC for when items were noted or added by The Tracking News.
|1459||Noted that NEODyS has posted 2008 YC3 as an impact risk - see above|
Noted that NEODyS has posted 2008 YD3 as an impact risk - see above
Noted that JPL Sentry has posted 2008 YJ3 as an impact risk - see above
Noted that NEODyS has posted 2008 YO2 as an impact risk - see above
Grabbed MPEC 2008-Y47 - Daily Orbit Update - see above
Grabbed MPEC 2008-Y48 - 2008 YJ3 - see above
|0517||Grabbed MPEC 2008-Y45 - 2005 SG19 - see above|
Grabbed MPEC 2008-Y46 - 2008 CL1 - see above
|0046||Grabbed MPEC 2008-Y44 - 2005 CS6 - see above|