Contents  on 7 December '12

Asteroid/Comet Connection (A/CC) 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.

Traffic Report  on 7 December '12

One object reported inside ten LD

One visitor is reported traveling within ten lunar distances (LD) of our planet today. Returning 2009 BS5 is calculated with some uncertainty to come inside ten LD, passing from 10.3 to 9.6 LD. No other objects are known to be approaching this close until early February.

This report was generated at 1712 UTC with the first follow-up for departed risk-listed 2012 XH in today's DOU MPEC along with observations of four other departed objects: 2012 XP2, 2012 XC, and risk-listed 2012 WR10, and 2012 WS3.


Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Object distances are interpreted by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 7 December '12

The MPC's NEO Confirmation Page has 20 listings

When last checked at 2332 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 20 objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 27 listings on the NEOCP 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 7 December '12

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been seven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2012-X30 - "21:45 UT" - 2012 XM16


MPEC 2012-X29 - "21:42 UT" - 2012 XL16


MPEC 2012-X28 - "21:39 UT" - 2012 XK16


MPEC 2012-X27 - "21:37 UT" - 2012 XJ16


MPEC 2012-X26 - "21:33 UT" - 2012 XH16


MPEC 2012-X25 - "21:30 UT" - 2012 XG16


<< DOU on 7 Dec. '12 >>  MPEC 2012-X24 - "06:02 UT" - Daily Orbit Update

Observers  on 7 December '12

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPECs 2012-X24 & 2012-X25 -- 2012 XG16, 2012 XC, 2012 WQ10, 2012 WP3, 2012 WG32, 2012 WB25, 2012 VP76, 2012 VN82, 2012 VM82, 2012 VM76, 2012 VK82, 2012 VJ6, 2012 VF82, 2012 VE37, 2012 VD77, 2012 TJ146, 2012 TA219, 2012 MV4, 2012 GV17
A81Balzaretto Obs. in Italy, 1 in MPEC 2012-X28 -- 2012 XK16
C12Berta Obs. in Spain, 1 in MPEC 2012-X28 -- 2012 XK16
B75Betelgeuse Station in Italy, 1 in MPEC 2012-X28 -- 2012 XK16
B88Bigmuskie Obs. in Italy, 1 in MPEC 2012-X24 -- 2012 TJ146
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2012-X24, 2012-X25, 2012-X28 & 2012-X29 -- 2012 XL16, 2012 XK16, 2012 XG16, 2012 VZ25, 2012 VJ82, 2008 XE2, 52761, 137052
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2012-X24 & 2012-X25 -- 2012 XP2, 2012 XG16, 2012 WP3, 313809, 232368
958Dax Obs. in France, 1 in MPEC 2012-X28 -- 2012 XK16
448Desert Moon Obs. in New Mexico, 5 in MPEC 2012-X24 -- 2012 VP76, 2012 VM82, 2008 HV4, 2004 TL19, 331963
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 4 in MPECs 2012-X24, 2012-X27 & 2012-X28 -- 2012 XZ6, 2012 XY6, 2012 XK16, 2012 XJ16
J95Great Shefford Obs. in England, 1 in MPEC 2012-X25 -- 2012 XG16
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2012-X28 -- 2012 XK16
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2012-X30 -- 2012 XM16
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2012-X25 -- 2012 XG16
704LINEAR in New Mexico, 11 in MPEC 2012-X24 -- 2012 XZ6, 2012 XY6, 2012 VF37, 2001 YM2, 2000 WL63, 329338, 276397, 153958, 137032, 6047, 3908
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-X24 -- 2012 TH146
C91Montevenere Obs., 1 in MPEC 2012-X28 -- 2012 XK16
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2012-X24, 2012-X25, 2012-X27, 2012-X28, 2012-X29 & 2012-X30 -- 2012 XM16, 2012 XL16, 2012 XK16, 2012 XJ16, 2012 XG16, 2012 VP76, 2012 TA79, 2009 SQ104, 2004 XL29, 2001 UF18, 153349, 3288
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2012-X28 -- 2012 XK16
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-X25 -- 2012 XG16
204Schiaparelli Obs. in Italy, 1 in MPEC 2012-X25 -- 2012 XG16
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2012-X24 -- 2006 WN1, 85490, 342866
291Spacewatch 1.8m telescope in Arizona, 22 in MPECs 2012-X24, 2012-X27, 2012-X28 & 2012-X29 -- 2012 XL16, 2012 XK16, 2012 XJ16, 2012 XH, 2012 WS3, 2012 WR10, 2012 WH, 2012 WG32, 2012 WC25, 2012 WB25, 2012 VK77, 2012 VF80, 2012 VF37, 2012 VF26, 2012 VE82, 2012 UD34, 2012 TS78, 2010 QD2, 2010 DE, 2008 YX32, 2004 XL29, 1999 HV1
2905Richard P. Boyle via Vatican Advanced Technology Telescope in Arizona, 1 in MPEC 2012-X26 -- 2012 XH16
J08Zonalunar Obs. in Spain, 1 in MPEC 2012-X28 -- 2012 XK16
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 December '12

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 CLOMON2 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
2012 XM16JPL Sentry23592053-2106251.4e-05-5.28-5.670JPL: "Analysis based on 26 observations spanning 1.0422 days (2012-Dec-06.28107 to 2012-Dec-07.32329)." Diameter approximately 0.024 km. from mean, weighted H=25.7.
2012 XY6JPL Sentry17092062-209272.4e-09-5.90-6.460JPL: "Analysis based on 43 observations spanning 3.0540 days (2012-Dec-03.22097 to 2012-Dec-06.27497)." Diameter approximately 0.566 km. from mean, weighted H=18.9.
2012 XHJPL Sentry17092065-211021.0e-07-7.62-7.730JPL: "Analysis based on 19 observations spanning 3.2618 days (2012-Dec-03.17776 to 2012-Dec-06.43952)." Diameter approximately 0.024 km. from mean, weighted H=25.8.
NEODyS17092065-208421.58e-07-7.41-7.590NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2012-12-03.179 to 2012-12-06.440."
2012 WR10JPL Sentry17092081-208725.7e-07-8.34-8.420JPL: "Analysis based on 35 observations spanning 14.153 days (2012-Nov-22.21759 to 2012-Dec-06.37106)." Diameter approximately 0.007 km. from mean, weighted H=28.5.
NEODyS17092087-210087.02e-07-8.30-8.740NEODyS: "Based on 35 optical observations (of which 1 are rejected as outliers) from 2012-11-22.218 to 2012-12-06.372."
2012 WS3JPL Sentry17092066-2112408.2e-05-4.86-5.530JPL: "Analysis based on 52 observations spanning 16.001 days (2012-Nov-20.32726 to 2012-Dec-06.32839)." Diameter approximately 0.022 km. from mean, weighted H=25.9.
NEODyS17092080-2100171.95e-06-6.43-7.010NEODyS: "Based on 52 optical observations (of which 0 are rejected as outliers) from 2012-11-20.328 to 2012-12-06.329."

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 7 December '12

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

2359Noted that JPL Sentry has posted 2012 XM16 as an impact risk - see above
2302Grabbed MPEC 2012-X25 - 2012 XG16 - see above
Grabbed MPEC 2012-X26 - 2012 XH16 - see above
Grabbed MPEC 2012-X27 - 2012 XJ16 - see above
Grabbed MPEC 2012-X28 - 2012 XK16 - see above
Grabbed MPEC 2012-X29 - 2012 XL16 - see above
Grabbed MPEC 2012-X30 - 2012 XM16 - see above
1712Generated Traffic Report
1709Noted that JPL Sentry has updated its 2012 WR10 risk assessment - see above
Noted that NEODyS has updated its 2012 WR10 risk assessment - see above
Noted that JPL Sentry has updated its 2012 WS3 risk assessment - see above
Noted that NEODyS has updated its 2012 WS3 risk assessment - see above
Noted that JPL Sentry has updated its 2012 XH risk assessment - see above
Noted that NEODyS has updated its 2012 XH risk assessment - see above
Noted that JPL Sentry has updated its 2012 XY6 risk assessment - see above
Grabbed MPEC 2012-X24 - Daily Orbit Update - see above