Contents on 17 December '08
- IAU Minor Planet Center
- NEOCP Activity -- none
- New MPECs -- two MPECs
- Observers -- eleven observing facilities
- Impact Risk Monitoring -- two objects
- Chronology
Resources:
- 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
The latest A/CC news is available via framed access, 
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 17 December '08
The MPC's NEO Confirmation Page is currently empty
The NEOCP is currently empty. There was one listing noted earlier today.
New MPECs on 17 December '08
Minor Planet Electronic Circulars
As of last check at 2255 UTC, there have been two MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2008-Y02 time-stamped "07:07 UT" - Daily Orbit Update - see below
- MPEC 2008-Y03 time-stamped "13:18 UT" - 2008 YA
MPEC 2008-Y03 - "13:18 UT" - 2008 YA
- K08Y00A 2008 YA (Q=4.513 AU, H=17.8 ~933m) was discovered at 1059 UT on 16 Dec. by the Siding Spring Survey (SSS), which observed it at Dec. 16.46-48p6, 17.43p2, and 17.50p2.
<< DOU on 17 Dec. '08 >> MPEC 2008-Y02 - "07:07 UT" - Daily Orbit Update
- Observations of risk-listed objects
- K08X02Q 2008 XQ2 (arc=12 days, H=19.9 ~355m) from Great Shefford Obs. (Dec. 17.20-22p2)
- K08W96K 2008 WK96 (small asteroid, arc=16 days, H=23.0 ~85m) from Schiaparelli Obs. (Dec. 8.04-05p3) and Desert Moon Obs. (Dec. 16.40p1 & 16.44p1)
- Observations of recently (no longer) risk-listed objects
- K08X02P 2008 XP2 (arc=12 days, H=18.5 ~676m) from Great Shefford Obs. (Dec. 17.23-24p3)
- K08X02B 2008 XB2 (small asteroid, arc=9 days, H=25.1 ~32m) from Schiaparelli Obs. (Dec. 7.81-82p3)
- K08W14D 2008 WD14 (small asteroid, arc=20 days, H=22.9 ~89m) from Schiaparelli Obs. (Dec. 7.00-01p3)
- Observations of other objects
- K08X02V 2008 XV2 (arc=11 days, H=20.3 ~295m) from Great Shefford Obs. (Dec. 17.17-19p3)
- K08X02E 2008 XE2 (arc=12 days, H=19.1 ~513m) from Desert Moon Obs. (Dec. 16.48-50p3)
- K08U90L 2008 UL90 (IEO, Q=0.959 AU, arc=52 days, H=18.5 ~676m) from Great Shefford Obs. (Dec. 17.24-25p3)
- K08U90K 2008 UK90 (arc=2 opp, H=18.7 ~616m) from Lawrence H. Wasserman via Cerro Tololo Inter-American Obs. (CTIO) (2007 Aug. 15.99p1, 2007 Aug. 16.06p1 & 2007 Aug. 16.20p1)
- K08T01A 2008 TA1 (arc=2 opp, H=18.7 ~616m) from the Spacewatch 0.9m telescope (2003 Oct. 2.27-32p3)
- K08S07R 2008 SR7 (arc=2 opp, H=19.9 ~355m) from NEAT's Mt. Palomar telescope (2005 Oct. 22.10p1, 2005 Oct. 22.17p1 & 2005 Oct. 22.24p1)
- K08S00Q 2008 SQ (arc=60 days, H=19.6 ~407m) from Smolyan Obs. (Oct. 2.11p5)
- K08E05V 2008 EV5 (arc=2 opp, H=20.2 ~309m) from SSS (Dec. 16.74p8)
- K06W02Z 2006 WZ2 (arc=3 opp, H=16.9 ~1.41 km) from Smolyan Obs. (Oct. 2.09p5)
- G4400 164400 2005 GN59 from SSS (Dec. 16.71-72p4)
- G3000 163000 2001 SW169 from Smolyan Obs. (Oct. 4.01p3)
- G2900 162900 2001 HG31 from Smolyan Obs. (Oct. 4.13-14p4)
- G2004 162004 1991 VE from LINEAR (Dec. 6.31-36p4)
- E4901 144901 2004 WG1 from Smolyan Obs. (Oct. 6.07p2)
- D7032 137032 1998 UO1 from Smolyan Obs. (Oct. 4.11p5)
- 52762 52762 1998 MT24 from Mirasteilas Obs. (Nov. 26.91-92p3) and Inastars Obs. (Dec. 8.93-94p3)
- 16960 16960 1998 QS52 from Smolyan Obs. (Oct. 4.11-12p5)
Observers on 17 December '08
Eleven observing facilities appear in today's MPECs.
| Code | Observer / observatory |
|---|---|
| 807& | Lawrence H. Wasserman via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2008-Y02 -- 2008 UK90 |
| 448 | Desert Moon Obs. in New Mexico, 2 in MPEC 2008-Y02 -- 2008 XE2, 2008 WK96 |
| J95 | Great Shefford Obs. in England, 4 in MPEC 2008-Y02 -- 2008 XV2, 2008 XQ2, 2008 XP2, 2008 UL90 |
| B15 | Inastars Obs. in Germany, 1 in MPEC 2008-Y02 -- 52762 |
| 704 | LINEAR in New Mexico, 1 in MPEC 2008-Y02 -- 162004 |
| B67 | Mirasteilas Obs. in Switzerland, 1 in MPEC 2008-Y02 -- 52762 |
| 644 | NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2008-Y02 -- 2008 SR7 |
| 204 | Schiaparelli Obs. in Italy, 3 in MPEC 2008-Y02 -- 2008 XB2, 2008 WK96, 2008 WD14 |
| E12 | Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2008-Y02 & 2008-Y03 -- 2008 YA, 2008 EV5, 164400 |
| 071 | Smolyan Obs. in Bulgaria, 7 in MPEC 2008-Y02 -- 2008 SQ, 2006 WZ2, 16960, 163000, 162900, 144901, 137032 |
| 691 | Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2008-Y02 -- 2008 TA1 |
| For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page. | |
Impact Risk Monitoring on 17 December '08
| 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 XQ2 | JPL Sentry | 1430 | R E M O V E D | JPL: Risk listing removed at 0950 UTC. | |||||
| NEODyS | 1430 | R E M O V E D | - | ||||||
| 2008 WK96 | JPL Sentry | 1430 | 2024-2031 | 2 | 1.0e-05 | -3.55 | -3.55 | 0 | JPL: "Analysis based on 39 observations spanning 16.054 days (2008-Nov-30.38762 to 2008-Dec-16.44151)." Diameter approximately 0.083 km. from mean, weighted H=23.1. |
| NEODyS | 1430 | 2024-2031 | 2 | 1.22e-05 | -3.49 | -3.49 | 0 | NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2008/11/30.388 to 2008/12/16.442." | |
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 17 December '08
Times are UTC for when items were noted or added by The Tracking News.
| 1430 | Noted that JPL Sentry has updated its 2008 WK96 risk assessment - see above Noted that NEODyS has updated its 2008 WK96 risk assessment - see above Noted that JPL Sentry has removed 2008 XQ2 as an impact risk - see above Noted that NEODyS has removed 2008 XQ2 as an impact risk - see above Grabbed MPEC 2008-Y02 - Daily Orbit Update - see above Grabbed MPEC 2008-Y03 - 2008 YA - see above Noted that the NEOCP has become empty |
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