Comet 103P/Hartley 2 imaged by DIF/EXPOXI 
5 Sept. 2010, credit NASA/JPL/UM.

A first image of thousands planned for comet 103P/Hartley 2 was shown yesterday from when the Deep Impact Flyby spacecraft on its extended EXPOXI mission was still further from its November 4th target than the comet was from Earth (more info here). 103P is seen at center (north to the lower right) at 1334 UTC on September 5th, credit NASA/JPL/UM.


Contents  on 9 September '10

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 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 9 September '10

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty. There were two listings noted earlier today.

New MPECs  on 9 September '10

Minor Planet Electronic Circulars

As of last check at 2302 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2010-R77 - "21:12 UT" - Comets C/2010 B6, 2010 B7, 2010 B8, 2010 B9, 2010 B10, 2010 B11, 2010 B12


MPEC 2010-R76 - "19:31 UT" - 2010 RX45


MPEC 2010-R75 - "18:46 UT" - Comets C/2010 B3, 2010 B4, 2010 B5 (STEREO)


MPEC 2010-R74 - "18:26 UT" - Comets C/2010 A18, 2010 A19, 2010 A20, 2010 A21, 2010 A22, 2010 A23 (STEREO)


<< DOU on 9 Sept. '10 >>  MPEC 2010-R73 - "06:09 UT" - Daily Orbit Update

Observers  on 9 September '10

Seventeen observing facilities appear in today's MPECs.

CodeObserver / observatory
J32Aljaraque Obs. in Spain, 1 in MPEC 2010-R73 -- 154029
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPECs 2010-R73 & 2010-R76 -- 2010 RZ11, 2010 RX45, 2010 RX30, 2010 RX3, 2010 RT3, 2010 RS30, 2010 RQ30, 2010 RM42, 2010 RL43, 2010 RK43, 2010 RK42, 2010 RF42, 2010 RF31, 2010 RF12, 2010 RD31, 2010 RC, 2010 RB, 2010 PS65
J02Busot Obs. in Spain, 1 in MPEC 2010-R73 -- 237442
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 3 in MPEC 2010-R73 -- 2010 RL43, 2010 RK43, 2010 RJ4
J95Great Shefford Obs. in England, 3 in MPECs 2010-R73 & 2010-R76 -- 2010 RX45, 2010 RL43, 2010 RJ43
H15ISON-NM Obs. in New Mexico, 2 in MPEC 2010-R73 -- 65679, 4197
704LINEAR in New Mexico, 10 in MPECs 2010-R73 & 2010-R76 -- 2010 RX45, 2010 PM10, 2005 QY151, 1997 GH28, 65679, 29075, 19764, 17182, 4660, 4197
844Los Molinos Obs. in Uruguay, 1 in MPEC 2010-R73 -- 2010 RF12
474Mt. John Obs. in New Zealand, 3 in MPECs 2010-R73 & 2010-R76 -- 2010 RX45, 2010 RF12, 2010 RB
C494HI1-A instrument (4) aboard STEREO-A in heliocentric orbit leading Earth, 9 in MPECs 2010-R74 & 2010-R75 -- C/2010 B5, C/2010 B4, C/2010 B3, C/2010 A23, C/2010 A22, C/2010 A21, C/2010 A20, C/2010 A19, C/2010 A18
C495COR2-A instrument (5) aboard STEREO-A in heliocentric orbit leading Earth, 1 in MPEC 2010-R75 -- C/2010 B3
C505COR2-B instrument (5) aboard STEREO-B in heliocentric orbit trailing Earth, 1 in MPEC 2010-R75 -- C/2010 B3
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2010-R76 -- 2010 RX45
204Schiaparelli Obs. in Italy, 6 in MPEC 2010-R73 -- 2010 PY75, 2010 PP2, 2006 BN6, 2000 PQ27, 7336, 5786
E12Siding Spring Survey in New South Wales, 1 in MPEC 2010-R73 -- 2010 RF12
2492LASCO Coronagraph 2 aboard the Solar & Heliospheric Obs. in Earth-Sun L1 HALO orbit, 1 in MPEC 2010-R75 -- C/2010 B3
2493LASCO Coronagraph 3 (SOHO C3) aboard the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 8 in MPECs 2010-R75 & 2010-R77 -- C/2010 B9, C/2010 B8, C/2010 B7, C/2010 B6, C/2010 B3, C/2010 B12, C/2010 B11, C/2010 B10
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2010-R73 -- 2010 PD57
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2010-R73 -- 2010 RW3, 2010 RQ30, 2010 PD57, 2010 GS7, 2010 AE
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 September '10

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2302 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 RX30JPL Sentry14292063-207329.4e-08-8.20-8.210JPL: "Analysis based on 84 observations spanning 2.7011 days (2010-Sep-05.43059 to 2010-Sep-08.131641)." Diameter approximately 0.012 km. from mean, weighted H=27.3.
2010 RQ30JPL Sentry1429R E M O V E DJPL: Risk listing removed at 0953 UTC.
NEODyS1429R E M O V E D-
2010 RF12NEODyS16172095-210054.74e-02-3.38-3.380NEODyS: "Based on 301 optical observations (of which 3 are rejected as outliers) from 2010/09/05.406 to 2010/09/08.476."
JPL Sentry14292095-2110405.0e-02-3.35-3.350JPL: "Analysis based on 299 observations spanning 3.0701 days (2010-Sep-05.40477 to 2010-Sep-08.47489)." Diameter approximately 0.007 km. from mean, weighted H=28.4.
2010 RZ11JPL Sentry1429R E M O V E DJPL: Risk listing removed at 0950 UTC.
NEODyS1429R E M O V E D-
2010 RW3NEODyS1429R E M O V E D-
2010 PS65JPL Sentry1429210212.2e-06-5.85-5.850JPL: "Analysis based on 53 observations spanning 26.054 days (2010-Aug-13.29423 to 2010-Sep-08.348089)." Diameter approximately 0.039 km. from mean, weighted H=24.7.

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 9 September '10

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

2210Grabbed MPEC 2010-R77 - Comets C/2010 B6, 2010 B7, 2010 B8, 2010 B9, 2010 B10, 2010 B11, 2010 B12 - see above
2106Noted that the NEOCP has become empty
1948Grabbed MPEC 2010-R74 - Comets C/2010 A18, 2010 A19, 2010 A20, 2010 A21, 2010 A22, 2010 A23 (STEREO) - see above
Grabbed MPEC 2010-R75 - Comets C/2010 B3, 2010 B4, 2010 B5 (STEREO) - see above
Grabbed MPEC 2010-R76 - 2010 RX45 - see above
1617Noted that NEODyS has reposted 2010 RF12 as an impact risk - see above
1429Noted that JPL Sentry has updated its 2010 PS65 risk assessment - see above
Noted that JPL Sentry has updated its 2010 RF12 risk assessment - see above
Noted that JPL Sentry has removed 2010 RQ30 as an impact risk - see above
Noted that NEODyS has removed 2010 RQ30 as an impact risk - see above
Noted that NEODyS has removed 2010 RW3 as an impact risk - see above
Noted that JPL Sentry has updated its 2010 RX30 risk assessment - see above
Noted that JPL Sentry has removed 2010 RZ11 as an impact risk - see above
Noted that NEODyS has removed 2010 RZ11 as an impact risk - see above
Grabbed MPEC 2010-R73 - Daily Orbit Update - see above
0426Noted that the NEOCP has become active