According to the NASA/JPL NEO Program Office yesterday, "Pre-discovery observations of asteroid 2007 WD5, taken on November 8, 2007 [and found by Andy Puckett in the Sloan Digital Sky Survey archive] have allowed its orbit to be refined... The impact probability resulting ... has increased to a surprising 3.9% (about 1 in 25 odds)." See full info, the December 23rd DOU MPEC, and earlier news links, which included this JPL illustration.
Contents on 29 December '07
- IAU Minor Planet Center
- NEOCP Activity -- none
- New MPECs -- two MPECs
- Observers -- sixteen observing facilities
- Impact Risk Monitoring -- three 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 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 29 December '07
The MPC's NEO Confirmation Page is currently empty
The NEOCP is currently empty. There was one listing noted earlier today.
New MPECs on 29 December '07
Minor Planet Electronic Circulars
As of last check at 2354 UTC, there have been two MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2007-Y52 time-stamped "07:07 UT" - Daily Orbit Update - see below
- MPEC 2007-Y53 time-stamped "14:39 UT" - 2007 YV29
MPEC 2007-Y53 - "14:39 UT" - 2007 YV29
- K07Y29V 2007 YV29 (risk-listed, H=18.6 ~645m) was discovered at 1047 UT on 28 Dec. by LINEAR, which observed it at Dec. 28.45-50p5. The discovery was confirmed by CAST Obs. (Dec. 28.89-90p2), Farra d'Isonzo Obs. (Dec. 28.92-94p2), New Millennium Obs. (Dec. 28.93-95p7), Suno Obs. (Dec. 28.96-97p4), Consell Obs. (Dec. 29.02-04p5), and Inastars Obs. (Dec. 29.10p4).
<< DOU on 29 Dec. '07 >> MPEC 2007-Y52 - "07:07 UT" - Daily Orbit Update
- Observations of risk-listed objects
- K07Y02B 2007 YB2 (Q=4.850 AU, arc=11 days, H=18.3 ~741m) from Inastars Obs. (Dec. 29.04-06p5) and Suno Obs. (Dec. 29.12-13p3)
- K07X11K 2007 XK11 (Q=4.505 AU, arc=23 days, H=19.2 ~490m) from the Spacewatch 1.8m telescope (Dec. 29.08-09p3)
- Observations of recently (no longer) risk-listed objects
- K07Y01N 2007 YN1 (small asteroid, Q=4.625 AU, arc=10 days, H=25.0 ~34m) from Astronomical Research Obs. (ARO) (Dec. 26.21-23p2) and Spacewatch 1.8m (Dec. 28.43-44p3)
- K07Y00Z 2007 YZ (arc=11 days, H=19.9 ~355m) from Consell Obs. (Dec. 28.98-99p5)
- K07Y00J 2007 YJ (arc=12 days, H=21.6 ~162m) from Spacewatch 1.8m (Dec. 28.27p2)
- K07Y00F 2007 YF (small asteroid, arc=12 days, H=24.8 ~37m) from Spacewatch 1.8m (Dec. 28.25p3)
- K07X16J 2007 XJ16 (arc=23 days, H=18.9 ~562m) from Spacewatch 1.8m (Dec. 28.41-42p3)
- K07X10D 2007 XD10 (arc=23 days, H=20.8 ~234m) from Spacewatch 1.8m (Dec. 28.28-29p3)
- K07X10B 2007 XB10 (i=41.4°, arc=23 days, H=17.5 ~1.07 km) from Spacewatch 1.8m (Dec. 28.39-40p3)
- K07X03P 2007 XP3 (q=0.252 AU, Q=4.237 AU, arc=24 days, H=19.1 ~513m) from Inastars Obs. (Dec. 28.85-86p4)
- K07W03Y 2007 WY3 (Q=4.937 AU, arc=40 days, H=18.2 ~776m) from ARO (Dec. 26.26-27p2) and Spacewatch 1.8m (Dec. 28.33p3)
- Observations of small asteroids (H>22.0)
- K07V03H 2007 VH3 (arc=57 days, H=22.6 ~102m) from Wildberg Obs. (Dec. 28.87-91p6)
- Observations of other objects
- K07Y01M 2007 YM1 (arc=10 days, H=20.8 ~234m) from LINEAR (Dec. 28.32-37p4)
- K07Y01F 2007 YF1 (Q=4.001 AU, arc=13 days, H=18.6 ~645m) from Paus Obs. (Dec. 28.00-01p2) and Inastars Obs. (Dec. 29.01-02p3)
- K07Y00H 2007 YH (arc=13 days, H=20.1 ~323m) from Inastars Obs. (Dec. 28.92-93p4)
- K07X16H 2007 XH16 (arc=19 days, H=19.6 ~407m) from Gnosca Obs. (Dec. 24.83-88p43)
- K07X09Y 2007 XY9 (arc=25 days, H=21.0 ~214m) from Wildberg Obs. (Dec. 28.82-83p4)
- K07W55F 2007 WF55 (arc=28 days, H=19.1 ~513m) from Inastars Obs. (Dec. 29.08-09p4)
- K07W04U 2007 WU4 (arc=40 days, H=18.7 ~616m) from Spacewatch 1.8m (Dec. 29.09-11p3)
- K07U02A 2007 UA2 (arc=80 days, H=21.0 ~214m) from ARO (Dec. 26.10-12p3)
- K07T71D 2007 TD71 (i=49.8°, arc=76 days, H=18.5 ~676m) from ARO (Dec. 26.03-05p3)
- K07T23B 2007 TB23 (i=38.3°, arc=77 days, H=18.7 ~616m) from ARO (Dec. 26.06-08p3)
- K07T15G 2007 TG15 (arc=81 days, H=19.6 ~407m) from New Millennium Obs. (Dec. 27.90-94p6)
- K07T08G 2007 TG8 (Q=4.305 AU, arc=106 days, H=18.6 ~645m) from New Millennium Obs. (Dec. 27.84-86p2)
- K07S11V 2007 SV11 (arc=90 days, H=18.0 ~851m) from ARO (Dec. 25.00p2)
- K07S02V 2007 SV2 (arc=100 days, H=21.1 ~204m) from ARO (Dec. 25.99p1) and Inastars Obs. (Dec. 28.77-79p4)
- K07R05F 2007 RF5 (arc=112 days, H=18.4 ~708m) from ARO (Dec. 26.01-02p3)
- K06B00G 2006 BG (arc=3 opp, H=18.6 ~645m) from Spacewatch 1.8m (Dec. 28.47-48p3)
- K05X08K 2005 XK8 (arc=2 opp, H=19.8 ~371m) from New Millennium Obs. (Dec. 27.91-94p5)
- K05X01D 2005 XD1 (arc=2 opp, H=19.2 ~490m) from New Millennium Obs. (Dec. 27.92-95p6)
- K05W56J 2005 WJ56 (arc=3 opp, H=17.9 ~891m) from LINEAR (Dec. 28.38-44p5)
- K05L39W 2005 LW39 (arc=2 opp, H=20.0 ~339m) from Spacewatch 1.8m (Dec. 29.07p3)
- K05G00G 2005 GG (arc=3 opp, H=16.0 ~2.14 km, q=0.694 AU) from North Ryde Obs. (Dec. 28.44-45p2)
- K04Y01G 2004 YG1 (arc=3 opp, H=21.5 ~170m) from Wildberg Obs. (Dec. 28.79-80p5)
- K03W25M 2003 WM25 (Q=4.100 AU, arc=2 opp, H=17.6 ~1.02 km) from LINEAR (Dec. 28.13-16p3)
- K03B84H 2003 BH84 (arc=2 opp, H=16.9 ~1.41 km) from New Millennium Obs. (Dec. 27.90p2)
- J98Y04M 1998 YM4 (arc=2 opp, H=19.7 ~389m) from Inastars Obs. (Dec. 28.89-91p4)
- J98V00O 1998 VO (arc=3 opp, H=20.4 ~282m) from ARO (Dec. 26.28-30p3)
- H2718 172718 2004 BD85 from the Spacewatch 0.9m telescope (Dec. 28.09-14p3) and Junk Bond Obs. (Dec. 28.27-33p4)
- H0903 170903 2004 WS2 from New Millennium Obs. (Dec. 27.90-93p6)
- E3678 143678 2003 SA224 from New Millennium Obs. (Dec. 27.84-88p6)
- D7084 137084 1998 XS16 from New Millennium Obs. (Dec. 27.84-88p6)
- 99935 99935 2002 AV4 from New Millennium Obs. (Dec. 27.79p2 & 27.87p2)
- 86324 86324 1999 WA2 from New Millennium Obs. (Dec. 27.87-88p2)
- 85804 85804 1998 WQ5 from New Millennium Obs. (Dec. 27.86-89p5)
- 68359 68359 2001 OZ13 from La Murta Obs. (Dec. 27.84p3)
- 21374 21374 1997 WS22 from New Millennium Obs. (Dec. 27.86-89p6)
- 20826 20826 2000 UV13 from New Millennium Obs. (Dec. 27.79-87p6)
- 18736 18736 1998 NU from New Millennium Obs. (Dec. 27.90-93p6)
Observers on 29 December '07
Sixteen observing facilities appear in today's MPECs.
| Code | Observer / observatory |
|---|---|
| H55 | Astronomical Research Obs. (ARO) in Illinois, 9 in MPEC 2007-Y52 -- 2007 YN1, 2007 WY3, 2007 UA2, 2007 TD71, 2007 TB23, 2007 SV2, 2007 SV11, 2007 RF5, 1998 VO |
| 235 | CAST Obs. in Italy, 1 in MPEC 2007-Y53 -- 2007 YV29 |
| 176 | Consell Obs. in Spain, 2 in MPECs 2007-Y52 & 2007-Y53 -- 2007 YZ, 2007 YV29 |
| 595 | Farra d'Isonzo Obs. in Italy, 1 in MPEC 2007-Y53 -- 2007 YV29 |
| 143 | Gnosca Obs. in Switzerland, 1 in MPEC 2007-Y52 -- 2007 XH16 |
| B15 | Inastars Obs. in Germany, 8 in MPECs 2007-Y52 & 2007-Y53 -- 2007 YV29, 2007 YH, 2007 YF1, 2007 YB2, 2007 XP3, 2007 WF55, 2007 SV2, 1998 YM4 |
| 701 | Junk Bond Obs. in Arizona, 1 in MPEC 2007-Y52 -- 172718 |
| 704 | LINEAR in New Mexico, 4 in MPECs 2007-Y52 & 2007-Y53 -- 2007 YV29, 2007 YM1, 2005 WJ56, 2003 WM25 |
| J76 | La Murta Obs. in Spain, 1 in MPEC 2007-Y52 -- 68359 |
| A24 | New Millennium Obs. in Italy, 15 in MPECs 2007-Y52 & 2007-Y53 -- 2007 YV29, 2007 TG8, 2007 TG15, 2005 XK8, 2005 XD1, 2003 BH84, 99935, 86324, 85804, 21374, 20826, 18736, 170903, 143678, 137084 |
| 423 | North Ryde Obs. in New South Wales, 1 in MPEC 2007-Y52 -- 2005 GG |
| B49 | Paus Obs. in Spain, 1 in MPEC 2007-Y52 -- 2007 YF1 |
| 691 | Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2007-Y52 -- 172718 |
| 291 | Spacewatch 1.8m telescope in Arizona, 11 in MPEC 2007-Y52 -- 2007 YN1, 2007 YJ, 2007 YF, 2007 XK11, 2007 XJ16, 2007 XD10, 2007 XB10, 2007 WY3, 2007 WU4, 2006 BG, 2005 LW39 |
| 147 | Suno Obs. in Italy, 2 in MPECs 2007-Y52 & 2007-Y53 -- 2007 YV29, 2007 YB2 |
| 198 | Wildberg Obs. in Germany, 3 in MPEC 2007-Y52 -- 2007 XY9, 2007 VH3, 2004 YG1 |
Impact Risk Monitoring on 29 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 YV29 | JPL Sentry | 1905 | 2032-2106 | 22 | 3.2e-08 | -4.13 | -4.89 | 0 | JPL: "Analysis based on 29 observations spanning .65343 days (2007-Dec-28.44971 to 2007-Dec-29.10314)." Diameter approximately 0.609 km. from mean, weighted H=18.7. |
| 2007 YB2 | JPL Sentry | 1553 | 2043-2098 | 2 | 8.4e-09 | -4.61 | -4.66 | 0 | JPL: "Analysis based on 52 observations spanning 10.783 days (2007-Dec-18.34552 to 2007-Dec-29.12888)." Diameter approximately 0.778 km. from mean, weighted H=18.2. |
| NEODyS | 1553 | R E M O V E D | |||||||
| 2007 XK11 | JPL Sentry | 1553 | 2101 | 1 | 5.8e-08 | -4.84 | -4.84 | 0 | JPL: "Analysis based on 58 observations spanning 22.999 days (2007-Dec-06.0886 to 2007-Dec-29.08731)." Diameter approximately 0.470 km. from mean, weighted H=19.3. |
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 29 December '07
Times are UTC for when items were noted or added by The Tracking News.
| 1905 | Noted that JPL Sentry has posted 2007 YV29 as an impact risk - see above |
| 1553 | Noted that JPL Sentry has updated its 2007 XK11 risk assessment - see above Noted that JPL Sentry has updated its 2007 YB2 risk assessment - see above Noted that NEODyS has removed 2007 YB2 as an impact risk - see above Grabbed MPEC 2007-Y53 - 2007 YV29 - see above The NEOCP has become empty |
| 0815 | Grabbed MPEC 2007-Y52 - Daily Orbit Update - see above |
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