136199 Eris & its moon from HST 
30 Aug. 2006 Credit: NASA, ESA & M. Brown

2006 imagery from the Hubble Space Telescope of 136199 Eris (2003 UB313) seemed to reinforce earlier evidence that this distant object is larger than Pluto, as reported in 2007. That has been challenged now by an Eris stellar occultation observed from Chile on November 6th which indicates that the more massive Eris has a diameter at or just under Pluto's. See more info here and here. Image credit: NASA, ESA & Mike Brown.


Contents  on 9 November '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 November '10

The MPC's NEO Confirmation Page has 2 listings: 2 new

When last checked at 2311 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new listings. Both of these were "one nighters." So far The Tracking News has counted a total of sixteen listings on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 9 November '10

Minor Planet Electronic Circulars

As of last check at 2311 UTC, there have been fifteen MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2010-V104 - "20:42 UT" - 2009 TK8


MPEC 2010-V103 - "18:14 UT" - 2010 VA76


MPEC 2010-V102 - "18:07 UT" - 2010 VZ75


MPEC 2010-V101 - "17:31 UT" - 2010 VW75


MPEC 2010-V100 - "14:04 UT" - 2010 VD72


MPEC 2010-V99 - "14:00 UT" - 2010 VC72


MPEC 2010-V98 - "13:55 UT" - 2010 VB72


MPEC 2010-V97 - "13:51 UT" - 2010 VA72


MPEC 2010-V96 - "13:46 UT" - 2010 VZ71


MPEC 2010-V95 - "13:41 UT" - 2010 VY71


<< DOU on 9 Nov. '10 >>  MPEC 2010-V94 - "07:11 UT" - Daily Orbit Update


MPEC 2010-V93 - "03:41 UT" - 2010 VS71


MPEC 2010-V92 - "01:49 UT" - 2010 VN65


MPEC 2010-V91 - "01:35 UT" - 2010 VM65


MPEC 2010-V90 - "00:34 UT" - 2010 SC41

Observers  on 9 November '10

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 25 in MPECs 2010-V91, 2010-V92, 2010-V93, 2010-V94, 2010-V95, 2010-V96, 2010-V97, 2010-V98, 2010-V100, 2010-V101 & 2010-V104 -- 2010 VZ71, 2010 VY71, 2010 VX39, 2010 VW75, 2010 VV21, 2010 VT11, 2010 VS71, 2010 VS21, 2010 VQ21, 2010 VN65, 2010 VN1, 2010 VM65, 2010 VM1, 2010 VD72, 2010 VB72, 2010 VB1, 2010 VA72, 2010 US7, 2010 UH7, 2010 TZ54, 2010 TV149, 2010 TH19, 2010 RK43, 2009 TK8, 2002 VE68
300Bisei Spaceguard Center in Japan, 1 in MPEC 2010-V93 -- 2010 VS71
160Castelmartini Obs. in Italy, 11 in MPEC 2010-V94 -- 2010 TM3, 2010 LO97, 2007 TD71, 88959, 250162, 219071, 216115, 153842, 152978, 100926, 5869
703Catalina Sky Survey (CSS) in Arizona, 23 in MPECs 2010-V90, 2010-V91, 2010-V93, 2010-V94, 2010-V95, 2010-V98 & 2010-V100 -- 2010 VY71, 2010 VS71, 2010 VM65, 2010 VE, 2010 VD72, 2010 VB72, 2010 TX168, 2010 TA178, 2010 SC41, 2010 QD2, 2008 RE80, 2002 UR3, 2001 WT1, 2000 PQ27, 1999 XR35, 88959, 168378, 161998, 137062, 137032, 136773, 6569, 5863
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2010-V94 -- 3838
448Desert Moon Obs. in New Mexico, 7 in MPEC 2010-V94 -- 2010 VZ11, 2010 VL1, 2010 VE, 2010 VA1, 2010 UE7, 2010 QE2, 189011
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 7 in MPECs 2010-V93, 2010-V94 & 2010-V100 -- 2010 VS71, 2010 VP21, 2010 VD72, 2010 UX6, 2010 TV149, 2010 LF86, 2002 VE68
H20Eastern Illinois Univ. Obs. in Illinois, 6 in MPEC 2010-V94 -- 2010 VZ11, 2010 VT11, 2007 VC138, 2007 TD71, 2005 TB15, 2002 VE68
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2010-V94 -- 2003 SV222
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 2 in MPECs 2010-V97 & 2010-V104 -- 2010 VA72, 2009 TK8
J95Great Shefford Obs. in England, 1 in MPEC 2010-V91 -- 2010 VM65
355Hadano Obs. in Japan, 10 in MPEC 2010-V94 -- 2010 TX168, 2010 TM3, 2010 TC55, 2010 LO97, 2002 VE68, 96590, 248083, 17181, 100926, 5869
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2010-V94 -- 2010 TC47
704LINEAR in New Mexico, 20 in MPECs 2010-V92 & 2010-V94 -- 2010 VT11, 2010 VP21, 2010 VN65, 2010 VM65, 2010 UX6, 2010 UQ7, 2010 UE7, 2010 UD8, 2010 TC55, 2010 RP80, 2010 RA147, 2010 PM10, 2010 NW117, 2008 YU32, 2004 VT60, 2002 UR3, 168378, 136773, 7336, 5143
J75La Sagra Obs. in Spain, 2 in MPECs 2010-V90 & 2010-V94 -- 2010 TA178, 2010 SC41
H01Magdalena Ridge Obs. (MRO) in New Mexico, 10 in MPECs 2010-V91, 2010-V92, 2010-V93, 2010-V94, 2010-V95, 2010-V96, 2010-V97, 2010-V98 & 2010-V101 -- 2010 VZ71, 2010 VZ11, 2010 VY71, 2010 VX39, 2010 VW75, 2010 VS71, 2010 VN65, 2010 VM65, 2010 VB72, 2010 VA72
5682David Tholen's team on Mauna Kea in Hawaii, 5 in MPECs 2010-V94, 2010-V99, 2010-V102 & 2010-V103 -- 2010 VZ75, 2010 VC72, 2010 VA76, 2010 NW1, 2010 HZ108
G96Mt. Lemmon Survey (MLS) in Arizona, 17 in MPECs 2010-V90, 2010-V92, 2010-V94, 2010-V95, 2010-V96, 2010-V97 & 2010-V101 -- 2010 VZ71, 2010 VY71, 2010 VW75, 2010 VN65, 2010 VA72, 2010 VA1, 2010 UH7, 2010 TZ54, 2010 TU5, 2010 TA178, 2010 SC41, 2006 BG, 2001 XD, 1998 HK49, 237442, 170903, 154991
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2010-V90, 2010-V94, 2010-V99, 2010-V102 & 2010-V103 -- 2010 VZ75, 2010 VD1, 2010 VC72, 2010 VA76, 2010 TA178, 2010 SC41
H23Pear Tree Obs. in Florida, 3 in MPEC 2010-V94 -- 2010 UX6, 2010 TX168, 2002 VE68
H06|H. Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2010-V100 -- 2010 VD72
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPECs 2010-V93 & 2010-V100 -- 2010 VS71, 2010 VD72
854Sabino Canyon Obs. in Arizona, 3 in MPECs 2010-V91, 2010-V93 & 2010-V100 -- 2010 VS71, 2010 VM65, 2010 VD72
H36Sandlot Obs. in Kansas, 4 in MPECs 2010-V95, 2010-V96, 2010-V97 & 2010-V100 -- 2010 VZ71, 2010 VY71, 2010 VD72, 2010 VA72
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2010-V90, 2010-V92 & 2010-V94 -- 2010 VX39, 2010 VN65, 2010 SC41, 2002 GM9
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2010-V94 -- 2010 VU21
C51WISE in Earth polar orbit, 2 in MPEC 2010-V94 -- 2010 UB8, 2006 VB14
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 November '10

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2311 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 VA76JPL Sentry20002034-210052.0e-09-7.91-8.150JPL: "Analysis based on 5 observations spanning .99752 days (2010-Nov-08.48961 to 2010-Nov-09.487128)." Diameter approximately 0.056 km. from mean, weighted H=23.9.
2010 VW75JPL Sentry20002012-21091133.4e-07-4.35-4.710JPL: "Analysis based on 17 observations spanning 1.0196 days (2010-Nov-08.13675 to 2010-Nov-09.156352)." Diameter approximately 0.134 km. from mean, weighted H=22.0.
2010 VC72JPL Sentry16392020-2109302.4e-07-5.99-6.850JPL: "Analysis based on 5 observations spanning .99582 days (2010-Nov-08.48226 to 2010-Nov-09.478084)." Diameter approximately 0.071 km. from mean, weighted H=23.4.
2010 VB72JPL Sentry16392015-2109276.0e-08-4.56-4.650JPL: "Analysis based on 10 observations spanning .89767 days (2010-Nov-08.40034 to 2010-Nov-09.298012)." Diameter approximately 0.260 km. from mean, weighted H=20.6.
2010 VX39NEODyS1639R E M O V E D-
JPL Sentry1639R E M O V E DJPL: Risk listing removed at 1050 UTC.
2010 VN1JPL Sentry16392046-206641.6e-06-7.38-7.500JPL: "Analysis based on 48 observations spanning 4.3375 days (2010-Nov-04.00752 to 2010-Nov-08.345019)." Diameter approximately 0.007 km. from mean, weighted H=28.3.
NEODyS16392050-206031.59e-06-7.36-7.520NEODyS: "Based on 49 optical observations (of which 1 are rejected as outliers) from 2010-11-03.996 to 2010-11-08.346."
2010 VB1JPL Sentry16392028-21101342.8e-04-3.08-3.450JPL: "Analysis based on 35 observations spanning 6.0179 days (2010-Nov-02.27134 to 2010-Nov-08.28923)." Diameter approximately 0.073 km. from mean, weighted H=23.3.
NEODyS16392028-2090491.76e-05-3.91-4.080NEODyS: "Based on 36 optical observations (of which 1 are rejected as outliers) from 2010-11-02.272 to 2010-11-08.290."

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 November '10

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

2111Grabbed MPEC 2010-V104 - 2009 TK8 - see above
2000Noted that JPL Sentry has posted 2010 VA76 as an impact risk - see above
Noted that JPL Sentry has posted 2010 VW75 as an impact risk - see above
1839Grabbed MPEC 2010-V102 - 2010 VZ75 - see above
Grabbed MPEC 2010-V103 - 2010 VA76 - see above
1805Grabbed MPEC 2010-V101 - 2010 VW75 - see above
1639Noted that JPL Sentry has updated its 2010 VB1 risk assessment - see above
Noted that NEODyS has updated its 2010 VB1 risk assessment - see above
Noted that JPL Sentry has posted 2010 VB72 as an impact risk - see above
Noted that JPL Sentry has posted 2010 VC72 as an impact risk - see above
Noted that JPL Sentry has updated its 2010 VN1 risk assessment - see above
Noted that NEODyS has updated its 2010 VN1 risk assessment - see above
Noted that JPL Sentry has removed 2010 VX39 as an impact risk - see above
Noted that NEODyS has removed 2010 VX39 as an impact risk - see above
Grabbed MPEC 2010-V94 - Daily Orbit Update - see above
Grabbed MPEC 2010-V95 - 2010 VY71 - see above
Grabbed MPEC 2010-V96 - 2010 VZ71 - see above
Grabbed MPEC 2010-V97 - 2010 VA72 - see above
Grabbed MPEC 2010-V98 - 2010 VB72 - see above
Grabbed MPEC 2010-V99 - 2010 VC72 - see above
Grabbed MPEC 2010-V100 - 2010 VD72 - see above
0400Grabbed MPEC 2010-V93 - 2010 VS71 - see above
0201Grabbed MPEC 2010-V91 - 2010 VM65 - see above
Grabbed MPEC 2010-V92 - 2010 VN65 - see above
0127Grabbed MPEC 2010-V90 - 2010 SC41 - see above