Comet 103P/Hartley 2 imaged by Arecibo 
24-27 Oct. 2010, courtesy NAIC-Arecibo.

Arecibo reported yesterday that the giant antenna in Puerto Rico had imaged comet 103P/Hartley 2 by radar at 150-meter resolution during 24-27 October, finding "the nucleus to be a highly elongated, bilobate object with a long-axis dimension of at least 2.2 km," and also studied its rotation and large-grain inner coma. Good info for the EPOXI mission with the Deep Impact spacecraft flying by the comet on November 4th. Credit NAIC-Arecibo/Harmon-Nolan, selected frames at twice pixel size.


Contents  on 30 October '10

Resources:

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NEOCP Activity  on 30 October '10

The MPC's NEO Confirmation Page has 20 listings: 3 new, 17 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three new and seventeen updated listings. Of these, eleven were "one nighters." The Tracking News counted a total of 24 listings on the NEOCP at some point on this day.

New MPECs  on 30 October '10

Minor Planet Electronic Circulars

There were six MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2010-U63 - "21:10 UT" - 2010 UM7


MPEC 2010-U62 - "20:28 UT" - 2010 UL7


MPEC 2010-U61 - "19:32 UT" - Comet P/2010 P4 (WISE)


MPEC 2010-U60 - "18:56 UT" - Comet P/2010 U1 (Boattini)


MPEC 2010-U59 - "14:44 UT" - 2010 UJ7


<< DOU on 30 Oct. '10 >>  MPEC 2010-U58 - "06:09 UT" - Daily Orbit Update

Observers  on 30 October '10

A total of 30 observing facilities appeared in this day's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2010-U58, 2010-U62 & 2010-U63 -- 2010 UX6, 2010 UO, 2010 UM7, 2010 UL7, 2010 UC7, 2010 TP55, 2010 TL
235CAST Obs. in Italy, 1 in MPEC 2010-U60 -- P/2010 U1
160Castelmartini Obs. in Italy, 10 in MPEC 2010-U58 -- 2010 TU149, 2010 TM3, 2010 LR68, 2010 LO97, 88959, 250697, 219071, 153842, 100926, 5869
703Catalina Sky Survey (CSS) in Arizona, 11 in MPEC 2010-U58 -- 2010 RP80, 2007 VG189, 251346, 241370, 234061, 219071, 20826, 137062, 12538, 7336, 5143
J01Cielo Profundo Obs. in Spain, 1 in MPEC 2010-U60 -- P/2010 U1
448Desert Moon Obs. in New Mexico, 4 in MPEC 2010-U58 -- 2010 TY54, 2010 TJ54, 2010 SK15, 2010 RR179
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 6 in MPEC 2010-U58 -- 2010 UX6, 2010 UD, 2010 TJ7, 2010 TF54, 2010 TC55, 2002 VE68
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2010-U62 -- 2010 UL7
F65Faulkes Telescope North in Hawaii, 1 in MPEC 2010-U61 -- P/2010 P4
157Frasso Sabino Obs. in Italy, 1 in MPEC 2010-U60 -- P/2010 U1
B21Gaisberg Obs. in Austria, 1 in MPEC 2010-U63 -- 2010 UM7
B86Hagen Obs. in Germany, 1 in MPEC 2010-U58 -- 2003 UV11
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2010-U59 -- 2010 UJ7
G92Jarnac Obs. in Arizona, 1 in MPEC 2010-U58 -- 216115
704LINEAR in New Mexico, 7 in MPECs 2010-U58 & 2010-U59 -- 2010 UJ7, 2010 UH7, 2010 TV149, 2010 RN80, 2004 TC10, 242216, 3552
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2010-U58, 2010-U59, 2010-U62 & 2010-U63 -- 2010 UZ6, 2010 UM7, 2010 UL7, 2010 UJ7
B82Maidbronn Obs. in Germany, 1 in MPEC 2010-U58 -- 2003 UV11
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2010-U58, 2010-U62 & 2010-U63 -- 2010 UM7, 2010 UL7, 2010 TU149, 2010 PM10, 2010 GP67, 2008 CZ118, 2007 TY18, 136795
H06RAS Obs. Mayhill in New Mexico, 1 in MPEC 2010-U60 -- P/2010 U1
473Remanzacco Obs. in Italy, 1 in MPEC 2010-U62 -- 2010 UL7
H36Sandlot Obs. in Kansas, 2 in MPECs 2010-U58 & 2010-U59 -- 2010 UJ7, 2010 TU149
204Schiaparelli Obs. in Italy, 1 in MPEC 2010-U62 -- 2010 UL7
E12Siding Spring Survey in New South Wales, 1 in MPEC 2010-U58 -- 2003 UV11
587Sormano Obs. in Italy, 3 in MPECs 2010-U58 & 2010-U62 -- 2010 UL7, 2010 RA147, 2010 HQ80
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2010-U58 -- 5869
291Spacewatch 1.8m telescope in Arizona, 23 in MPECs 2010-U58, 2010-U62 & 2010-U63 -- 2010 UX6, 2010 UM7, 2010 UL7, 2010 UA7, 2010 TX54, 2010 TU54, 2010 TR54, 2010 TP54, 2010 TJ167, 2010 TA55, 2010 SL15, 2010 SH13, 2010 SG15, 2010 RT80, 2010 RT30, 2010 RS3, 2010 RC12, 2010 MW1, 2010 HQ80, 2010 FO92, 2006 KV86, 2002 NW16, 1999 XX262
C36Starry Wanderer Obs., 1 in MPEC 2010-U58 -- 2003 UV11
231Vesqueville Obs. in Belgium, 1 in MPEC 2010-U58 -- 2003 UV11
C51WISE in Earth polar orbit, 1 in MPEC 2010-U58 -- 2010 UY6
J08Zonalunar Obs. in Spain, 2 in MPEC 2010-U58 -- 2007 RU17, 2003 UV11
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 October '10

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
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
2010 UJ7JPL Sentry18342015-2104164.8e-04-2.66-2.660JPL: "Analysis based on 16 observations spanning 1.1137 days (2010-Oct-29.33853 to 2010-Oct-30.45225)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
2010 UC7JPL Sentry17022092-210455.6e-07-6.33-6.700JPL: "Analysis based on 30 observations spanning .82436 days (2010-Oct-28.43616 to 2010-Oct-29.260518)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
2010 UA7JPL Sentry1702R E M O V E DJPL: Risk listing removed at 1028 UTC.
NEODyS1702R E M O V E D-
2010 UZ6JPL Sentry1702R E M O V E DJPL: Risk listing removed at 1028 UTC.
NEODyS1702R E M O V E D-
2010 UY6JPL Sentry1702R E M O V E DJPL: Risk listing removed at 0950 UTC.
2010 UX6JPL Sentry1702207913.1e-07-5.74-5.740JPL: "Analysis based on 59 observations spanning 1.5439 days (2010-Oct-27.77604 to 2010-Oct-29.31996)." Diameter approximately 0.086 km. from mean, weighted H=23.0.
NEODyS1702207913.5e-07-5.68-5.680NEODyS: "Based on 59 optical observations (of which 0 are rejected as outliers) from 2010/10/27.777 to 2010/10/29.321."
2010 TP55JPL Sentry1702R E M O V E DJPL: Risk listing removed at 0950 UTC.
NEODyS1702R E M O V E D-

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 30 October '10

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

2201Grabbed MPEC 2010-U63 - 2010 UM7 - see above
2103Grabbed MPEC 2010-U62 - 2010 UL7 - see above
1941Grabbed MPEC 2010-U60 - Comet P/2010 U1 (Boattini) - see above
Grabbed MPEC 2010-U61 - Comet P/2010 P4 (WISE) - see above
1834Noted that JPL Sentry has posted 2010 UJ7 as an impact risk - see above
1702Noted that JPL Sentry has removed 2010 TP55 as an impact risk - see above
Noted that NEODyS has removed 2010 TP55 as an impact risk - see above
Noted that JPL Sentry has removed 2010 UA7 as an impact risk - see above
Noted that NEODyS has removed 2010 UA7 as an impact risk - see above
Noted that JPL Sentry has updated its 2010 UC7 risk assessment - see above
Noted that JPL Sentry has updated its 2010 UX6 risk assessment - see above
Noted that NEODyS has updated its 2010 UX6 risk assessment - see above
Noted that JPL Sentry has removed 2010 UY6 as an impact risk - see above
Noted that JPL Sentry has removed 2010 UZ6 as an impact risk - see above
Noted that NEODyS has removed 2010 UZ6 as an impact risk - see above
Grabbed MPEC 2010-U58 - Daily Orbit Update - see above
Grabbed MPEC 2010-U59 - 2010 UJ7 - see above