Contents on 12 December '07
- IAU Minor Planet Center
- NEOCP Activity -- none
- New MPECs -- one MPEC
- Observers -- eight observing facilities
- Impact Risk Monitoring -- four 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 news: framed access (best), 
RSS news feed (flags updates), or redirection - Note: A/CC has a main Web site and a backup site, which now has its own backup 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 this year 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 12 December '07
The MPC's NEO Confirmation Page is currently empty
The NEOCP is currently empty and hasn't been noted by The Tracking News as being active yet today (last checked at 2354 UTC).
New MPECs on 12 December '07
Minor Planet Electronic Circulars
As of last check at 2354 UTC, there has been one MPEC issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
<< DOU on 12 Dec. '07 >> MPEC 2007-X53 - "07:11 UT" - Daily Orbit Update
- Observations of risk-listed objects
- K07X16N 2007 XN16 (small asteroid, arc=2 days, H=25.9 ~22m) from Great Shefford Obs. (Dec. 11.92p3)
- K07X09Z 2007 XZ9 (small asteroid, arc=8 days, H=24.8 ~37m) from Great Shefford Obs. (Dec. 12.05-06p2)
- K07X03P 2007 XP3 (q=0.201 AU, Q=5.593 AU, arc=8 days, H=18.8 ~589m) from Great Shefford Obs. (Dec. 12.07-08p2)
- K07W03Y 2007 WY3 (Q=4.945 AU, arc=24 days, H=18.2 ~776m) from Great Shefford Obs. (Dec. 12.12-13p3)
- Observations of small asteroids (H>22.0)
- K07X10A 2007 XA10 (arc=8 days, H=22.9 ~89m) from Great Shefford Obs. (Dec. 11.00p3)
- Observations of other objects
- K07X16H 2007 XH16 (arc=3 days, H=19.4 ~446m) from the Siding Spring Survey (SSS) (Dec. 11.42p1)
- K07X03T 2007 XT3 (arc=7 days, H=21.4 ~178m) from Great Shefford Obs. (Dec. 12.01-02p3)
- K07W04W 2007 WW4 (arc=22 days, H=19.5 ~426m) from SSS (Dec. 11.58p1)
- K07T15G 2007 TG15 (arc=63 days, H=19.6 ~407m) from New Millennium Obs. (Dec. 5.80p2) and Kinver Obs. (Dec. 10.75-79p5)
- K07S11E 2007 SE11 (i=48.3°, arc=81 days, H=17.8 ~933m) from New Millennium Obs. (Dec. 5.79p2) and Kinver Obs. (Dec. 10.75-78p4)
- K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from Hamamatsu-Yuto Obs. (Dec. 11.58-59p3)
- K03B84H 2003 BH84 (arc=2 opp, H=16.8 ~1.48 km) from New Millennium Obs. (Dec. 5.80-84p6) and Hamamatsu-Yuto Obs. (Dec. 11.53-56p5)
- J99A10Q 1999 AQ10 (arc=3 opp, H=20.3 ~295m) from New Millennium Obs. (Dec. 5.79-84p6)
- J96T11Y 1996 TY11 (arc=6 opp, H=19.4 ~446m) from New Millennium Obs. (Dec. 5.81p1)
- H0903 170903 2004 WS2 from New Millennium Obs. (Dec. 5.88p2) and Paus Obs. (Dec. 11.88-90p2)
- G2273 162273 1999 VL12 from Isle of Man Obs. (Dec. 10.90-93p2)
- G2142 162142 1998 VR from Isle of Man Obs. (Dec. 10.91-93p2)
- E3678 143678 2003 SA224 from New Millennium Obs. (Dec. 5.79-83p5)
- D8947 138947 2001 BA40 from Paus Obs. (Dec. 11.96p1)
- D7084 137084 1998 XS16 from New Millennium Obs. (Dec. 5.78-82p4)
- 86324 86324 1999 WA2 from New Millennium Obs. (Dec. 5.77-81p4)
- 85804 85804 1998 WQ5 from New Millennium Obs. (Dec. 5.86p2)
- 85275 85275 1994 LY from SSS (Dec. 11.53-56p3)
- 66272 66272 1999 JW6 from Highworth Obs. (Dec. 11.83-85p2)
- 66146 66146 1998 TU3 from SSS (Dec. 11.45-47p4)
- 21374 21374 1997 WS22 from New Millennium Obs. (Dec. 5.86p2)
- 20826 20826 2000 UV13 from New Millennium Obs. (Dec. 5.78-82p5)
- 18736 18736 1998 NU from New Millennium Obs. (Dec. 5.86p2)
- 03553 3553 Mera (1985 JA) from New Millennium Obs. (Dec. 5.81-83p4)
- 01580 1580 Betulia (1950 KA) from New Millennium Obs. (Dec. 5.87p2)
Observers on 12 December '07
Eight observing facilities appear in today's MPEC.
| Code | Observer / observatory |
|---|---|
| J95 | Great Shefford Obs. in England, 6 in MPEC 2007-X53 -- 2007 XZ9, 2007 XT3, 2007 XP3, 2007 XN16, 2007 XA10, 2007 WY3 |
| 379 | Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2007-X53 -- 2007 PU11, 2003 BH84 |
| 951 | Highworth Obs. in England, 1 in MPEC 2007-X53 -- 66272 |
| 987 | Isle of Man Obs. on the Isle of Man, 2 in MPEC 2007-X53 -- 162273, 162142 |
| J66 | Kinver Obs. in England, 2 in MPEC 2007-X53 -- 2007 TG15, 2007 SE11 |
| A24 | New Millennium Obs. in Italy, 15 in MPEC 2007-X53 -- 2007 TG15, 2007 SE11, 2003 BH84, 1999 AQ10, 1996 TY11, 86324, 85804, 21374, 20826, 18736, 170903, 143678, 137084, 3553, 1580 |
| B49 | Paus Obs. in Spain, 2 in MPEC 2007-X53 -- 170903, 138947 |
| E12 | Siding Spring Survey (SSS) in New South Wales, 4 in MPEC 2007-X53 -- 2007 XH16, 2007 WW4, 85275, 66146 |
Impact Risk Monitoring on 12 December '07
| 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 |
| 2007 XN16 | JPL Sentry | 1356 | R E M O V E D | JPL: Risk listing removed at 1126 UTC. | |||||
| 2007 XZ9 | JPL Sentry | 1356 | 2056-2089 | 3 | 1.4e-06 | -5.80 | -6.04 | 0 | JPL: "Analysis based on 35 observations spanning 7.8651 days (2007-Dec-04.19408 to 2007-Dec-12.05916)." Diameter approximately 0.037 km. from mean, weighted H=24.8. |
| NEODyS | 1356 | 2047-2089 | 5 | 1.54e-06 | -5.75 | -6.06 | 0 | NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2007/12/04.195 to 2007/12/12.060." | |
| 2007 XP3 | JPL Sentry | 1356 | 2038-2097 | 3 | 2.7e-08 | -3.79 | -3.98 | 0 | JPL: "Analysis based on 16 observations spanning 7.6952 days (2007-Dec-04.38257 to 2007-Dec-12.07781)." Diameter approximately 0.690 km. from mean, weighted H=18.4. |
| NEODyS | 1356 | 2038-2059 | 3 | 1.43e-07 | -3.17 | -3.26 | 0 | NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2007/12/04.383 to 2007/12/12.079." | |
| 2007 WY3 | JPL Sentry | 1356 | R E M O V E D | JPL: Risk listing removed at 1250 UTC. | |||||
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 12 December '07
Times are UTC for when items were noted or added by The Tracking News.
| 1356 | Noted that JPL Sentry has removed 2007 WY3 as an impact risk - see above Noted that JPL Sentry has removed 2007 XN16 as an impact risk - see above Noted that JPL Sentry has updated its 2007 XP3 risk assessment - see above Noted that NEODyS has updated its 2007 XP3 risk assessment - see above Noted that JPL Sentry has updated its 2007 XZ9 risk assessment - see above Noted that NEODyS has updated its 2007 XZ9 risk assessment - see above Grabbed MPEC 2007-X53 - Daily Orbit Update - see above |
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