Contents  on 19 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 19 December '12

Six objects reported inside ten LD

There are six asteroids reported to be within ten lunar distances (LD) of Earth today. Radar target 2012 XM55 is inbound from 4.32 to 3.90 LD and everything else is outbound. Radar target intruder 2012 XB112 moves from 4.24 to 5.17 LD, 2012 XP134 from 6.81 to 8.75 LD, risk-listed 2012 XM16 from 6.98 to 9.68 LD, intruder 2012 XL134 from 7.50 to 9.72 LD, and 2012 XN134 departs from inside ten LD, traveling from 10.00 to 11.44 LD.

Up next, 2012 XP55 arrives inside ten LD on December 26th.

This report was generated at 1516 UTC with the recovery of, and first follow-up for departed 2012 XT111 in today's DOU MPEC along with observations of 2012 XB112 and 2012 XM55, and departed objects 2012 XK134, 2012 XJ134, 2012 XM16, and 2012 XH.


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 19 December '12

The MPC's NEO Confirmation Page has 11 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eleven objects listed. Of these, seven were "one nighters."

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 19 December '12

Minor Planet Electronic Circulars

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


<< DOU on 19 Dec. '12 >>  MPEC 2012-Y09 - "06:04 UT" - Daily Orbit Update

Observers  on 19 December '12

Fifteen observers appear in today's MPEC.

CodeObserver / observatory
C77Bernezzo Obs. in Italy, 2 in MPEC 2012-Y09 -- 2012 XJ134, 2012 XD133
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-Y09 -- 2012 YK
G36CASADO in Spain, 1 in MPEC 2012-Y09 -- 1994 XD
448Desert Moon Obs. in New Mexico, 2 in MPEC 2012-Y09 -- 2012 XC112, 4179
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPEC 2012-Y09 -- 2005 JF21, 152679
E104program code 4 via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-Y09 -- 99942
D00ISON-Kislovodsk Obs., 4 in MPEC 2012-Y09 -- 2012 XS134, 2007 LV, 330825, 136793
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPEC 2012-Y09 -- 2012 XT134, 2012 XM55, 2012 XH
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 17 in MPEC 2012-Y09 -- 2012 XY6, 2012 XQ55, 2012 XM134, 2012 XJ134, 2012 XF112, 2012 XE112, 2012 XD133, 2012 XD112, 2012 XC112, 2012 VF37, 2012 TA79, 2012 SA59, 2012 HJ1, 2001 YM2, 2000 WL63, 1994 XD, 4179
204Schiaparelli Obs. in Italy, 18 in MPEC 2012-Y09 -- 2012 XZ6, 2012 XM55, 2012 XM16, 2012 XK16, 2012 XE17, 2012 XB112, 2012 VA5, 2012 US136, 2012 TJ146, 2012 JT17, 2011 WS2, 2005 SH19, 2004 YC5, 2004 CH52, 2000 WL63, 1994 XD, 345705, 4179
033Schwarzschild Obs. in Germany, 3 in MPEC 2012-Y09 -- 2012 XK16, 2012 XD55, 2012 WE33
G40Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2012-Y09 -- 2012 XC112
291Spacewatch 1.8m telescope in Arizona, 22 in MPEC 2012-Y09 -- 2012 XT134, 2012 XT111, 2012 XS93, 2012 XS134, 2012 XS111, 2012 XR111, 2012 XO55, 2012 XO111, 2012 XM134, 2012 XK134, 2012 XJ134, 2012 XF133, 2012 XF112, 2012 XE133, 2012 XD17, 2012 XD112, 2012 WC25, 2012 OP4, 2009 LW2, 2007 YB2, 2007 CA19, 2003 VG1
926Tenagra II Obs. in Arizona, 2 in MPEC 2012-Y09 -- 2002 AW, 189173
2905Richard P. Boyle via Vatican Advanced Technology Telescope in Arizona, 1 in MPEC 2012-Y09 -- 153220
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 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 XT134JPL Sentry1512R E M O V E DJPL: Risk listing removed at 1031 UTC.
2012 XM134JPL Sentry1512R E M O V E DJPL: Risk listing removed at 1031 UTC.
2012 XK134JPL Sentry1512209516.1e-09-9.30-9.300JPL: "Analysis based on 31 observations spanning 5.2279 days (2012-Dec-13.14593 to 2012-Dec-18.37388)." Diameter approximately 0.018 km. from mean, weighted H=26.4.
NEODyS15122065-208721.08e-07-7.85-7.850NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2012-12-13.147 to 2012-12-18.375."
2012 XE133JPL Sentry15122083-210456.5e-08-6.73-7.190JPL: "Analysis based on 68 observations spanning 5.9446 days (2012-Dec-12.43361 to 2012-Dec-18.37817)." Diameter approximately 0.067 km. from mean, weighted H=23.5.
NEODyS15122083-209642.04e-08-7.23-7.730NEODyS: "Based on 68 optical observations (of which 0 are rejected as outliers) from 2012-12-12.434 to 2012-12-18.379."
2012 XO111NEODyS1512R E M O V E D-
JPL Sentry1512R E M O V E DJPL: Risk listing removed at 0951 UTC.
2012 XM16JPL Sentry15122081-210722.4e-06-6.12-6.170JPL: "Analysis based on 56 observations spanning 7.1930 days (2012-Dec-06.28107 to 2012-Dec-13.474086)." Diameter approximately 0.024 km. from mean, weighted H=25.8.
NEODyS15122081-209533.15e-06-5.99-5.990NEODyS: "Based on 56 optical observations (of which 0 are rejected as outliers) from 2012-12-06.282 to 2012-12-13.475."
2012 XHNEODyS15122084-208413.6e-09-9.30-9.30NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2012-12-03.179 to 2012-12-18.322."

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 19 December '12

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

1516Generated Traffic Report
1512Noted that JPL Sentry has updated its 2012 XE133 risk assessment - see above
Noted that NEODyS has updated its 2012 XE133 risk assessment - see above
Noted that NEODyS has updated its 2012 XH risk assessment - see above
Noted that JPL Sentry has updated its 2012 XK134 risk assessment - see above
Noted that NEODyS has updated its 2012 XK134 risk assessment - see above
Noted that JPL Sentry has removed 2012 XM134 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 XM16 risk assessment - see above
Noted that NEODyS has updated its 2012 XM16 risk assessment - see above
Noted that JPL Sentry has removed 2012 XO111 as an impact risk - see above
Noted that NEODyS has removed 2012 XO111 as an impact risk - see above
Noted that JPL Sentry has removed 2012 XT134 as an impact risk - see above
Grabbed MPEC 2012-Y09 - Daily Orbit Update - see above