Contents  on 18 December '07

Resources:

The latest A/CC news is available via framed access, RSS news feed 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 18 December '07

The MPC's NEO Confirmation Page has 12 listings: 6 new, 6 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had six new and six updated listings. Of these, ten were "one nighters." So far The Tracking News has counted a total of 29 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 18 December '07

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been eleven MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2007-Y29 - "22:33 UT" - 2007 YN1


MPEC 2007-Y28 - "22:06 UT" - 2007 YM1


MPEC 2007-Y27 - "21:52 UT" - 2007 MB24


MPEC 2007-Y26 - "20:23 UT" - 2007 YJ1


MPEC 2007-Y25 - "20:18 UT" - 2007 YH1


MPEC 2007-Y24 - "20:07 UT" - 2007 YG1


MPEC 2007-Y23 - "20:02 UT" - 2007 YF1


MPEC 2007-Y22 - "18:02 UT" - Comet C/2007 Y1 (LINEAR)


<< DOU on 18 Dec. '07 >>  MPEC 2007-Y21 - "07:09 UT" - Daily Orbit Update


MPEC 2007-Y20 - "05:26 UT" - 2007 YZ


MPEC 2007-Y19 - "05:21 UT" - 2007 XF25

Observers  on 18 December '07

A total of 30 observing facilities appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 1 in MPEC 2007-Y20 -- 2007 YZ
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2007-Y28 -- 2007 YM1
J92Beaconsfield Obs. in England, 1 in MPEC 2007-Y21 -- 2007 WE55
300Bisei Spaceguard Center in Japan, 1 in MPEC 2007-Y20 -- 2007 YZ
I77CEAMIG-REA in Brazil, 1 in MPEC 2007-Y21 -- 2007 XH16
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2007-Y21 & 2007-Y28 -- 2007 YM1, 7889
734Farpoint Obs. in Kansas, 1 in MPEC 2007-Y23 -- 2007 YF1
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2007-Y20, 2007-Y28 & 2007-Y29 -- 2007 YZ, 2007 YN1, 2007 YM1
651Grasslands Obs. in Arizona, 2 in MPECs 2007-Y23 & 2007-Y28 -- 2007 YM1, 2007 YF1
J95Great Shefford Obs. in England, 2 in MPEC 2007-Y21 -- 2007 YJ, 2007 XF18
A17Guidestar Obs. in Germany, 4 in MPECs 2007-Y20, 2007-Y21, 2007-Y28 & 2007-Y29 -- 2007 YZ, 2007 YN1, 2007 YM1, 2005 XK8
379Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2007-Y21 -- 2007 VQ4, 2007 SP6, 2007 PU11, 2003 BH84
J44Iturrieta Obs. in Spain, 1 in MPEC 2007-Y21 -- 2007 PU11
715Jornada Obs. in New Mexico, 3 in MPEC 2007-Y21 -- 2007 XB10, 2007 WB, 2007 VG189
246KLENOT in the Czech Republic, 1 in MPEC 2007-Y28 -- 2007 YM1
704LINEAR in New Mexico, 2 in MPECs 2007-Y19 & 2007-Y22 -- C/2007 Y1, 2007 XF25
699LONEOS in Arizona, 1 in MPEC 2007-Y23 -- 2007 YF1
J34La Fecha Obs., 2 in MPEC 2007-Y21 -- 2007 WF55, 2005 XD1
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2007-Y21 -- 2007 YZ
711McDonald Obs. in Texas, 3 in MPECs 2007-Y22, 2007-Y23 & 2007-Y24 -- 2007 YG1, 2007 YF1, C/2007 Y1
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2007-Y21 -- 153591
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2007-Y19, 2007-Y21, 2007-Y23, 2007-Y24, 2007-Y25 & 2007-Y26 -- 2007 YJ1, 2007 YH1, 2007 YG1, 2007 YF1, 2007 XF25, 2001 PK9, 31346, 31345, 9400
2614Andrew Lowe in Alberta using the Palomar Digitized Sky Survey in southern California, 1 in MPEC 2007-Y27 -- 2007 MB24
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 16 in MPEC 2007-Y21 -- 2007 WY3, 2007 WF55, 2007 VQ4, 2007 US6, 2007 SP6, 2005 YW55, 2005 TU45, 2001 FZ6, 90403, 25916, 18736, 170891, 162004, 153201, 138947, 11398
H06RAS Obs. Mayhill in New Mexico, 1 in MPEC 2007-Y22 -- C/2007 Y1
H062Robert Hutsebaut in Belgium via RAS Obs. Mayhill in New Mexico, 2 in MPECs 2007-Y28 & 2007-Y29 -- 2007 YN1, 2007 YM1
461SZTE Asteroid Program (SZTE) in Hungary, 4 in MPECs 2007-Y20, 2007-Y21 & 2007-Y22 -- 2007 YZ, C/2007 Y1, 2007 TG8, 2007 SE11
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2007-Y28 -- 2007 YM1
434San Benedetto Po Obs. in Italy, 1 in MPEC 2007-Y21 -- 153591
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2007-Y21 & 2007-Y29 -- 2007 YN1, 2005 YY128, 85628, 23548
291Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2007-Y21 & 2007-Y24 -- 2007 YG1, 2007 YG, 2007 XZ9, 2007 XP3, 2007 XK11, 2007 XJ16, 2007 XF18, 2007 XB10, 2007 WV4, 2007 VK184, 2007 NS4

Impact Risk Monitoring  on 18 December '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2354 UTC)
See the CRT page for a list of all objects rated recently as risks.
Note that the time horizon for JPL is 100 years from today and for NEODyS is now usually the year 2090.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.
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 YG1JPL Sentry23302020-2107246.2e-09-3.97-4.510JPL: "Analysis based on 18 observations spanning 1.9184 days (2007-Dec-16.45543 to 2007-Dec-18.37382)." Diameter approximately 1.386 km. from mean, weighted H=17.0.
2007 YZJPL Sentry1525R E M O V E DJPL #2 for the day: Risk listing removed at 1512 UTC.
2007 YMNEODyS16042011-2089901.1e-05-5.09-5.870NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2007/12/17.397 to 2007/12/17.525."
JPL Sentry01582010-21061223.9e-06-5.83-6.420JPL: "Analysis based on 12 observations spanning .12805 days (2007-Dec-17.39661 to 2007-Dec-17.52466)." Diameter approximately 0.020 km. from mean, weighted H=26.1.
2007 YJJPL Sentry1446R E M O V E DJPL #2 for the day: Risk listing removed at 1424 UTC.
2007 YGJPL Sentry1820R E M O V E DJPL: Risk listing removed at 1803 UTC.
2007 XF25NEODyS20332014-2088377.18e-08-5.03-5.390NEODyS: "Based on 8 optical observations (of which 0 are rejected as outliers) from 2007/12/15.327 to 2007/12/17.427."
JPL Sentry14462024-2101332.8e-08-5.47-6.280JPL: "Analysis based on 8 observations spanning 2.0999 days (2007-Dec-15.32609 to 2007-Dec-17.42596)." Diameter approximately 0.237 km. from mean, weighted H=20.8.
2007 XF18JPL Sentry1446R E M O V E DJPL: Risk listing removed at 1341 UTC.
2007 XJ16NEODyS1604R E M O V E D
JPL Sentry1446R E M O V E DJPL: Risk listing removed at 1251 UTC.
2007 XK11JPL Sentry16372064-210121.3e-07-4.23-4.280JPL: "Analysis based on 42 observations spanning 11.991 days (2007-Dec-06.0886 to 2007-Dec-18.07966)." Diameter approximately 0.496 km. from mean, weighted H=19.2.
NEODyS14462045-206421.07e-07-4.28-4.290NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2007/12/06.089 to 2007/12/18.080."
2007 XB10JPL Sentry1446R E M O V E DJPL: Risk listing removed at 1214 UTC.
NEODyS1446R E M O V E D
2007 XZ9NEODyS16042056-208941.52e-06-5.78-5.960NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2007/12/04.195 to 2007/12/18.184."
JPL Sentry14462056-208951.6e-06-5.75-5.940JPL: "Analysis based on 41 observations spanning 13.990 days (2007-Dec-04.19408 to 2007-Dec-18.18365)." Diameter approximately 0.037 km. from mean, weighted H=24.8.
2007 XP3JPL Sentry1759R E M O V E DJPL: Risk listing removed at 1728 UTC.
NEODyS1446R E M O V E D
2007 VK184JPL Sentry22592048-205743.3e-04-1.85-1.851JPL: "Analysis based on 95 observations spanning 35.987 days (2007-Nov-12.13904 to 2007-Dec-18.1258)." Diameter approximately 0.130 km. from mean, weighted H=22.0.
NEODyS14462048-205733.22e-04-1.86-1.871NEODyS: "Based on 96 optical observations (of which 1 are rejected as outliers) from 2007/11/12.140 to 2007/12/18.134. NOTE: The Virtual Impactor in 2048/06/03.088 in the table above is rated as Torino Scale 1."

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 18 December '07

Times are UTC for when items were noted or added by The Tracking News.

2330Noted that JPL Sentry has posted 2007 YG1 as an impact risk - see above
2259Noted that JPL Sentry has updated its 2007 VK184 risk assessment - see above
Grabbed MPEC 2007-Y29 - 2007 YN1 - see above
2232Grabbed MPEC 2007-Y28 - 2007 YM1 - see above
2159Grabbed MPEC 2007-Y27 - 2007 MB24 - see above
2033Noted that NEODyS has posted 2007 XF25 as an impact risk - see above
Grabbed MPEC 2007-Y23 - 2007 YF1 - see above
Grabbed MPEC 2007-Y24 - 2007 YG1 - see above
Grabbed MPEC 2007-Y25 - 2007 YH1 - see above
Grabbed MPEC 2007-Y26 - 2007 YJ1 - see above
1820Noted that JPL Sentry has removed 2007 YG as an impact risk - see above
Grabbed MPEC 2007-Y22 - Comet C/2007 Y1 (LINEAR) - see above
1759Noted that JPL Sentry has removed 2007 XP3 as an impact risk - see above
1637Noted that JPL Sentry has updated its 2007 XK11 risk assessment - see above
1604Noted that NEODyS has removed 2007 XJ16 as an impact risk - see above
Noted that NEODyS has updated its 2007 XZ9 risk assessment - see above
Noted that NEODyS has posted 2007 YM as an impact risk - see above
1525Noted that JPL Sentry has removed 2007 YZ as an impact risk - see above
1446Noted that NEODyS has updated its 2007 VK184 risk assessment - see above
Noted that JPL Sentry has removed 2007 XB10 as an impact risk - see above
Noted that NEODyS has removed 2007 XB10 as an impact risk - see above
Noted that JPL Sentry has removed 2007 XF18 as an impact risk - see above
Noted that JPL Sentry has posted 2007 XF25 as an impact risk - see above
Noted that JPL Sentry has removed 2007 XJ16 as an impact risk - see above
Noted that NEODyS has updated its 2007 XK11 risk assessment - see above
Noted that NEODyS has removed 2007 XP3 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 XZ9 risk assessment - see above
Noted that JPL Sentry has removed 2007 YJ as an impact risk - see above
Noted that JPL Sentry has posted 2007 YZ as an impact risk - see above
Grabbed MPEC 2007-Y21 - Daily Orbit Update - see above
0556Grabbed MPEC 2007-Y19 - 2007 XF25 - see above
Grabbed MPEC 2007-Y20 - 2007 YZ - see above
0426Noted that JPL Sentry has posted 2007 YJ as an impact risk - see above
0158Noted that JPL Sentry has posted 2007 YM as an impact risk - see above