Contents  on 31 December '07

Resources:

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NEOCP Activity  on 31 December '07

The MPC's NEO Confirmation Page has 15 listings: 8 new, 7 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had eight new and seven updated listings. Of these, eight were "one nighters." The Tracking News counted a total of eighteen objects listed on the NEOCP at some point on this day.

New MPECs  on 31 December '07

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there were six MPECs issued this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2007-Y61 - "12:49 UT" - 2006 SU131


<< DOU on 31 Dec. '07 >>  MPEC 2007-Y60 - "07:07 UT" - Daily Orbit Update


MPEC 2007-Y59 - "03:11 UT" - Observations of Comets


MPEC 2007-Y58 - "03:02 UT" - Comet C/2007 Y1 (LINEAR)


MPEC 2007-Y57 - "02:59 UT" - Comet C/2007 W3 (LINEAR)


MPEC 2007-Y56 - "02:56 UT" - Comet C/2007 W1 (Boattini)

Observers  on 31 December '07

A total of 52 observing facilities appeared in this day's MPECs.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 2 in MPEC 2007-Y59 -- C/2006 S5, C/2006 Q1
349Ageo Obs. in Japan, 11 in MPEC 2007-Y59 -- C/2007 U1, P/2007 R4, C/2007 E1, C/2006 W3, C/2005 EL173, 192P, 190P, 110P, 46P, 17P, 8P
A81Balzaretto Obs. in Italy, 2 in MPECs 2007-Y59 & 2007-Y60 -- 153591, 8P
170Begues Obs. in Spain, 6 in MPECs 2007-Y59 & 2007-Y60 -- 2007 YZ, 2007 YX1, C/2007 U1, 2007 SP6, 190P, 29P
215Buchloe Obs. in Germany, 11 in MPECs 2007-Y57 & 2007-Y59 -- C/2007 W3, C/2007 U1, P/2007 R4, C/2006 W3, C/2006 S5, C/2006 K1, 192P, 116P, 110P, 17P, 8P
235CAST Obs. in Italy, 11 in MPEC 2007-Y59 -- P/2007 H1, C/2006 S5, C/2006 OF2, 128P, 110P, 93P, 50P, 46P, 29P, 17P, 8P
I77CEAMIG-REA in Brazil, 2 in MPEC 2007-Y59 -- C/2006 Q1, 17P
B09Capannoli Obs. in Italy, 4 in MPEC 2007-Y59 -- P/2007 C2, C/2006 S5, 173P, 50P
B20Carmelita Obs. in Spain, 6 in MPEC 2007-Y59 -- 110P, 93P, 50P, 29P, 17P, 8P
B53Casal Lumbroso Obs., 1 in MPEC 2007-Y59 -- 29P
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2007-Y59 & 2007-Y60 -- 2007 YZ, C/2007 U1, C/2007 T5, P/2007 C2, C/2006 S5, 96189, 68063, 34613, 18736, 4450, 173P, 79P
A77Chante-Perdrix Obs. in France, 7 in MPEC 2007-Y59 -- P/2007 H1, 192P, 190P, 116P, 29P, 17P, 8P
448Desert Moon Obs. in New Mexico, 4 in MPEC 2007-Y60 -- 2007 XJ20, 2007 WV3, 2007 LS, 2003 BT35
J36El Olivo Obs. in Spain, 6 in MPEC 2007-Y59 -- 110P, 93P, 50P, 29P, 17P, 8P
157Frasso Sabino Obs. in Italy, 3 in MPECs 2007-Y57 & 2007-Y60 -- 2007 WF55, C/2007 W3, 2005 XD1
B34Green Island Obs. in Cyprus, 1 in MPEC 2007-Y59 -- 17P
A07Gretz-Armainvilliers Obs., 1 in MPEC 2007-Y59 -- 8P
442Gualba Obs. in Spain, 5 in MPEC 2007-Y59 -- 93P, 50P, 29P, 17P, 8P
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2007-Y59 -- 93P, 17P, 8P
A18Herne Obs. in Germany, 6 in MPEC 2007-Y59 -- C/2006 OF2, 93P, 50P, 46P, 17P, 8P
D88Hiratsuka Obs., 3 in MPEC 2007-Y59 -- P/2007 H1, 192P, 46P
B19Iluro Obs. in Spain, 2 in MPEC 2007-Y59 -- C/2006 W3, C/2006 S5
J44Iturrieta Obs. in Spain, 2 in MPEC 2007-Y59 -- 17P, 8P
246KLENOT in the Czech Republic, 1 in MPEC 2007-Y59 -- P/2007 R4
415Kambah Obs. in Australia, 9 in MPECs 2007-Y56 & 2007-Y59 -- C/2007 W1, P/2007 R4, C/2007 Q3, P/2007 H1, C/2007 D3, C/2006 U6, C/2006 Q1, C/2006 K1, C/2005 EL173
400Kitami Obs. in Japan, 2 in MPEC 2007-Y59 -- C/2006 S5, 110P
704LINEAR in New Mexico, 8 in MPECs 2007-Y57 & 2007-Y59 -- C/2007 W3, C/2007 U1, P/2007 C2, C/2007 B2, C/2006 M1, 195P, 191P, 128P
699LONEOS in Arizona, 1 in MPEC 2007-Y60 -- 2007 US6
J76La Murta Obs. in Spain, 9 in MPEC 2007-Y59 -- P/2007 H1, C/2006 M1, 110P, 74P, 50P, 46P, 29P, 17P, 8P
J38La Vara Obs. in Spain, 11 in MPEC 2007-Y59 -- C/2007 E1, C/2006 W3, C/2006 OF2, 191P, 110P, 93P, 50P, 46P, 29P, 17P, 8P
J59Linceo Obs. in Spain, 1 in MPEC 2007-Y59 -- 46P
A06Mataro Obs. in Spain, 8 in MPEC 2007-Y59 -- C/2006 S5, 110P, 93P, 74P, 50P, 29P, 17P, 8P
J46Montana Blanca Obs. in the Canary Islands, 3 in MPEC 2007-Y59 -- C/2007 U1, 29P, 8P
213Montcabre Obs. in Spain, 14 in MPECs 2007-Y56, 2007-Y58 & 2007-Y59 -- C/2007 Y1, C/2007 W1, P/2007 T6, C/2007 T5, P/2007 H1, C/2006 W3, 195P, 110P, 93P, 74P, 46P, 29P, 17P, 8P
945Monte Deva Obs. in Spain, 5 in MPEC 2007-Y59 -- C/2007 B2, C/2006 S5, 93P, 17P, 8P
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2007-Y60 -- 1998 YM4, 68063, 162058
J47Nazaret Obs. in Spain, 6 in MPECs 2007-Y58 & 2007-Y59 -- C/2007 Y1, 110P, 74P, 29P, 17P, 8P
423North Ryde Obs. in New South Wales, 7 in MPECs 2007-Y56, 2007-Y58 & 2007-Y59 -- C/2007 Y1, C/2007 W1, C/2007 Q3, C/2006 U6, C/2006 Q1, C/2006 K1, C/2005 EL173
B49Paus Obs. in Spain, 2 in MPECs 2007-Y59 & 2007-Y60 -- 2007 YB2, C/2007 U1
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPECs 2007-Y59 & 2007-Y60 -- 2007 YZ, 2007 VQ4, 2007 SP6, 2005 WJ56, 2005 TU45, 2000 CH59, 66407, 154347, 1620, 17P
J53Posadas Obs. in Spain, 2 in MPEC 2007-Y59 -- 191P, 93P
H06RAS Obs. Mayhill in New Mexico, 1 in MPEC 2007-Y56 -- C/2007 W1
233San Vito Obs. in Italy, 3 in MPECs 2007-Y59 & 2007-Y60 -- 2005 XD1, 68359, 74P
204Schiaparelli Obs. in Italy, 2 in MPEC 2007-Y59 -- C/2007 D3, 128P
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2007-Y60 -- 2007 VL243, 2004 XY60
510Siegen Obs. in Germany, 9 in MPECs 2007-Y59 & 2007-Y60 -- 2007 XH16, C/2006 S5, 99935, 86324, 4954, 93P, 50P, 17P, 8P
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2007-Y59 & 2007-Y60 -- P/2007 C2, 2005 WR2, 79P, 74P
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2007-Y60 & 2007-Y61 -- 2007 YG, 2007 YB2, 2007 XK11, 2007 VO243, 2007 UQ51, 2007 PV27, 2006 SU131, 2006 BT7, 2003 QB90
A78Stia Obs. in Italy, 5 in MPEC 2007-Y60 -- 2007 XH16, 2007 SP6, 2005 XK8, 2005 XD1, 2003 BH84
926Tenagra II Obs. in Arizona, 1 in MPEC 2007-Y59 -- 74P
J70Vega del Thader Obs. in Spain, 1 in MPEC 2007-Y59 -- 8P
H47Vicksburg Obs. in Mississippi, 6 in MPEC 2007-Y59 -- P/2007 H1, C/2006 K1, 74P, 50P, 46P, 29P

Impact Risk Monitoring  on 31 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 YB2NEODyS1453204314.97e-08-3.82-3.820NEODyS: "Based on 55 optical observations (of which 0 are rejected as outliers) from 2007/12/18.346 to 2007/12/31.081."
JPL Sentry14522043-209824.8e-08-3.84-3.860JPL: "Analysis based on 55 observations spanning 12.735 days (2007-Dec-18.34552 to 2007-Dec-31.08035)." Diameter approximately 0.770 km. from mean, weighted H=18.2.
2007 YG1NEODyS1451R E M O V E D
2007 XK11JPL Sentry1452R E M O V E DJPL: Risk listing removed at 1121 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 31 December '07

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

1453Grabbed MPEC 2007-Y60 - Daily Orbit Update - see above
1452Noted that JPL Sentry has removed 2007 XK11 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 YB2 risk assessment - see above
1451Noted that NEODyS has reposted 2007 YB2 as an impact risk - see above
Noted that NEODyS has removed 2007 YG1 as an impact risk - see above
Grabbed MPEC 2007-Y61 - 2006 SU131 - see above
0517Grabbed MPEC 2007-Y56 - Comet C/2007 W1 (Boattini) - see above
Grabbed MPEC 2007-Y57 - Comet C/2007 W3 (LINEAR) - see above
Grabbed MPEC 2007-Y58 - Comet C/2007 Y1 (LINEAR) - see above
Grabbed MPEC 2007-Y59 - Observations of Comets - see above