Contents  on 15 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 15 December '12

Eight objects reported inside ten LD

Eight visitors are reported to be within ten lunar distances (LD) of Earth today. Risk-listed intruder 2012 XL134 passes through the Earth-Moon system, coming in from 1.63 to 0.72 at 1542 UT and then out to 1.06 LD from Earth, no closer to the Moon than 1.56 LD at 1715 UT. And radar target intruder 2012 XB112 exits our system, moving from 0.90 to 1.55 LD, passing the Moon at 1.05 LD at 1001 UT.

Also inside Earth's Hill sphere, 2012 XP134 comes its closest to Earth this time around, reaching 1.22 LD at 1428 UT, and its closest to the Moon -- 1.88 LD at 2052 UT. And risk-listed 2012 XH112 comes its closest to Earth on this passage, coming to 1.72 LD at 1632 UT, and its closest to the Moon -- 2.46 LD at 2007 UT.

Further out, risk-listed 2012 XM16 is inbound from 6.26 to 4.00 LD and radar target 2012 XM55 from 6.39 to 5.83 LD, while 2012 XN134 is outbound from 5.22 to 6.14 LD and unreported 2009 BS5 is calculated with some uncertainty to depart from inside ten LD, traveling from 9.5 to 10.1 LD.

Headed our way next, 2012 XP55 arrives inside ten LD on December 26th

This report was updated at 2020 UTC with revised distances and times. Today's first traffic report was generated at 1759 UTC with today's DOU MPEC reporting observations of thirteen close-passing objects, including first follow-up for 2012 XP134, 2012 XN134, 2012 XL134, and 2012 XP55 (adding 4.832 days to a 1.804-day observing arc), as well as astrometry for 2012 XJ134, 2012 XH112, 2012 XB112, 2012 XM55, 2012 XM16, 2012 XP2, 2012 XH, departed risk-listed 2012 WR10 (adding 6.039 days to the previous 15.205-day arc), and departed risk-listed 2012 WS3 (tacking 7.107 days onto 16.001).


Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. 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 15 December '12

The MPC's NEO Confirmation Page has 7 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven objects listed. Of these, three were "one nighters." So far The Tracking News has counted a total of nine 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 15 December '12

Minor Planet Electronic Circulars

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


MPEC 2012-X103 - "20:36 UT" - 2012 XO144


MPEC 2012-X102 - "18:02 UT" - 2012 XO144


MPEC 2012-X101 - "17:23 UT" - 2005 XT77


<< DOU on 15 Dec. '12 >>  MPEC 2012-X100 - "06:04 UT" - Daily Orbit Update

Observers  on 15 December '12

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 21 in MPECs 2012-X100 & 2012-X102 -- 2012 XY6, 2012 XO144, 2012 XN55, 2012 XN2, 2012 XE17, 2012 XB112, 2012 WH, 2012 WG32, 2012 VM82, 2012 VJ82, 2012 VF37, 2012 VE82, 2012 TQ78, 2012 TA219, 2012 RF15, 2012 HY33, 2007 GD49, 2006 SO19, 2002 PG43, 2002 LE27, 1999 KK1
726Brainerd Obs. in Minnesota, 8 in MPEC 2012-X100 -- 2012 XQ55, 2000 WL63, 1994 XD, 345705, 330825, 192563, 5646, 4179
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPEC 2012-X100 -- 2012 XQ93, 2012 XP2, 2012 XN55, 2012 XK16, 2012 XH55, 2012 XE112, 2012 XA, 2009 LS, 2004 BE85, 189011, 140039
I51Clinton Obs., 1 in MPEC 2012-X100 -- 330825
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2012-X100 -- 2012 XJ134, 2012 XD133
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 11 in MPECs 2012-X100 & 2012-X101 -- 2012 XZ132, 2012 XP55, 2012 XK55, 2012 XJ16, 2012 XG55, 2012 XF17, 2012 VF37, 2009 WF106, 2006 KY86, 2005 XT77, 4486
I57Elche Obs., 1 in MPEC 2012-X100 -- 4179
J95Great Shefford Obs. in England, 4 in MPEC 2012-X100 -- 2012 XP134, 2012 XN134, 2012 XL134, 2012 XH112
699LONEOS in Arizona, 1 in MPEC 2012-X103 -- 2012 XO144
5682David Tholen's team on Mauna Kea in Hawaii, 8 in MPEC 2012-X100 -- 2012 XO111, 2012 XM55, 2012 XM16, 2012 XH, 2012 XB112, 2012 WS3, 2012 WR10, 2012 UE34
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2012-X103 -- 2012 XO144
J47Nazaret Obs. in Spain, 1 in MPEC 2012-X100 -- 4179
A24New Millennium Obs. in Italy, 48 in MPEC 2012-X100 -- 2012 XJ134, 2012 XE133, 2012 VF37, 2012 TA79, 2012 TA219, 2012 SA59, 2012 HJ1, 2008 XE2, 2008 AV28, 2006 WR127, 2001 YM2, 2000 WL63, 1994 XD, 68548, 52762, 333358, 330825, 329338, 277127, 276397, 256412, 249886, 222165, 192563, 189173, 18882, 17188, 17182, 163364, 159533, 153958, 153306, 152742, 144411, 141052, 137805, 137199, 137052, 12711, 12538, 11284, 10115, 6455, 5646, 3908, 3360, 3200, 2212
J43Oukaimeden Obs. in Morocco, 4 in MPEC 2012-X100 -- 329614, 159923, 136793, 12711
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2012-X102 -- 2012 XO144
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-X102 -- 2012 XO144
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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 XT134NEODyS17462025-2098262.54e-09-4.63-5.040NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2012-12-11.414 to 2012-12-14.382."
2012 XL134JPL Sentry17452084-208821.7e-08-9.25-9.310JPL: "Analysis based on 19 observations spanning 1.7553 days (2012-Dec-13.16812 to 2012-Dec-14.923426)." Diameter approximately 0.009 km. from mean, weighted H=27.8.
NEODyS1745R E M O V E D-
2012 XE133NEODyS17462066-209739.51e-09-7.40-7.490NEODyS: "Based on 53 optical observations (of which 0 are rejected as outliers) from 2012-12-12.434 to 2012-12-13.409."
JPL Sentry17452066-207451.9e-07-6.07-6.100JPL: "Analysis based on 53 observations spanning .97461 days (2012-Dec-12.43361 to 2012-Dec-13.40822)." Diameter approximately 0.069 km. from mean, weighted H=23.4.
2012 XH112NEODyS17462087-208712.43e-08-8.65-8.650NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2012-12-12.283 to 2012-12-15.008."
JPL Sentry1745R E M O V E DJPL: Risk listing removed at 1032 UTC.
2012 XB112NEODyS1745R E M O V E D-
2012 XO111NEODyS17462062-208044.51e-07-4.57-4.990NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2012-12-10.119 to 2012-12-13.382."
JPL Sentry17452050-208093.6e-08-5.67-6.370JPL: "Analysis based on 30 observations spanning 3.2626 days (2012-Dec-10.11829 to 2012-Dec-13.380876)." Diameter approximately 0.220 km. from mean, weighted H=20.9.
2012 XM16NEODyS17462081-209543.23e-06-5.98-5.990NEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2012-12-06.282 to 2012-12-13.475."
JPL Sentry17452081-210732.5e-06-6.11-6.160JPL: "Analysis based on 54 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.
2012 XHNEODyS17462084-208413.27e-09-9.31-9.310NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2012-12-03.179 to 2012-12-13.522."
JPL Sentry17452065-211021.9e-07-7.49-7.590JPL: "Analysis based on 30 observations spanning 10.343 days (2012-Dec-03.17776 to 2012-Dec-13.521071)." Diameter approximately 0.021 km. from mean, weighted H=26.1.
2012 WR10NEODyS17462081-208111.29e-07-8.98-8.980NEODyS: "Based on 40 optical observations (of which 1 are rejected as outliers) from 2012-11-22.218 to 2012-12-13.462."
JPL Sentry17452087-209638.3e-07-8.23-8.440JPL: "Analysis based on 40 observations spanning 21.244 days (2012-Nov-22.21759 to 2012-Dec-13.461582)." Diameter approximately 0.006 km. from mean, weighted H=28.6.
2012 WS3NEODyS17462077-2100131.86e-06-6.45-6.880NEODyS: "Based on 56 optical observations (of which 0 are rejected as outliers) from 2012-11-20.328 to 2012-12-13.436."
JPL Sentry17452082-2112321.7e-05-5.55-6.490JPL: "Analysis based on 56 observations spanning 23.108 days (2012-Nov-20.32726 to 2012-Dec-13.435101)." Diameter approximately 0.022 km. from mean, weighted H=25.9.
2012 UE34NEODyS17462095-209931.16e-06-5.44-5.520NEODyS: "Based on 44 optical observations (of which 0 are rejected as outliers) from 2012-10-18.394 to 2012-12-13.332."
JPL Sentry17452095-211182.7e-06-5.08-5.510JPL: "Analysis based on 44 observations spanning 55.938 days (2012-Oct-18.393522 to 2012-Dec-13.331175)." Diameter approximately 0.081 km. from mean, weighted H=23.1.

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 15 December '12

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

2119Grabbed MPEC 2012-X103 - 2012 XO144 - see above
2020Updated Traffic Report
1814Grabbed MPEC 2012-X102 - 2012 XO144 - see above
1746Noted that NEODyS has updated its 2012 UE34 risk assessment - see above
Noted that NEODyS has updated its 2012 WR10 risk assessment - see above
Noted that NEODyS has updated its 2012 WS3 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 NEODyS has updated its 2012 XH112 risk assessment - see above
Noted that NEODyS has updated its 2012 XM16 risk assessment - see above
Noted that NEODyS has updated its 2012 XO111 risk assessment - see above
1745Noted that JPL Sentry has updated its 2012 UE34 risk assessment - see above
Noted that JPL Sentry 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 removed 2012 XB112 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 XE133 risk assessment - see above
Noted that JPL Sentry has updated its 2012 XH risk assessment - see above
Noted that JPL Sentry has removed 2012 XH112 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 XL134 risk assessment - see above
Noted that NEODyS has removed 2012 XL134 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 XM16 risk assessment - see above
Noted that JPL Sentry has updated its 2012 XO111 risk assessment - see above
Noted that NEODyS has posted 2012 XT134 as an impact risk - see above
Grabbed MPEC 2012-X100 - Daily Orbit Update - see above
Grabbed MPEC 2012-X101 - 2005 XT77 - see above