Contents  on 10 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 10 December '12

Four objects reported inside ten LD

Four objects are reported to be within ten lunar distances (LD) of our planet today. Intruder 2012 XE54 enters Earth's Hill sphere, passing from 4.26 to 1.38 LD on the way to passing through the Earth-Moon system tomorrow.

Further out, two newly announced objects are inbound: risk-listed 2012 XL55 from 7.50 to 4.67 LD and 2012 XM55 from 9.42 to 8.79 LD. And 2009 BS5, which so far hasn't been reported observed on this return, is calculated with some uncertainty to be inbound from 8.7 to 8.5 LD.

Coming our way next, risk-listed 2012 XM16 arrives inside ten LD on December 13th and new discovery 2012 XP55 arrives on December 26th.

This report was updated at 2316 UTC with new discoveries 2012 XP55 (MPEC), 2012 XP55 (MPEC), and 2012 XM55 (MPEC). The traffic report was previously updated at 1730 UTC to note today's DOU MPEC with observations of 2012 XE54, departed 2012 XM16, and departed risk-listed 2012 XP2 and 2012 XH. Today's first traffic report was generated at 0010 UTC to note the discovery announced late yesterday of approaching intruder 2012 XE54 (MPEC).


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 10 December '12

The MPC's NEO Confirmation Page has 44 listings

When last checked at 2304 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 44 objects listed. Of these, 34 were "one nighters." So far The Tracking News has counted a total of 72 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 10 December '12

Minor Planet Electronic Circulars

As of last check at 2326 UTC, there have been fifteen MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2012-X52 - "21:03 UT" - 2012 XJ55


MPEC 2012-X51 - "21:00 UT" - 2012 XQ55


MPEC 2012-X50 - "20:57 UT" - 2012 XP55


MPEC 2012-X49 - "20:54 UT" - 2012 XO55


MPEC 2012-X48 - "20:51 UT" - 2012 XN55


MPEC 2012-X47 - "20:49 UT" - 2012 XM55


MPEC 2012-X46 - "20:46 UT" - 2012 XL55


MPEC 2012-X45 - "20:43 UT" - 2012 XK55


MPEC 2012-X44 - "20:40 UT" - 2012 XH55


MPEC 2012-X43 - "20:37 UT" - 2012 XG55


MPEC 2012-X42 - "20:34 UT" - 2012 XF55


MPEC 2012-X41 - "20:32 UT" - 2012 XE55


MPEC 2012-X40 - "20:23 UT" - 2012 XD55


MPEC 2012-X39 - "19:52 UT" - 2012 XC55


<< DOU on 10 Dec. '12 >>  MPEC 2012-X38 - "06:03 UT" - Daily Orbit Update

Observers  on 10 December '12

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 3 in MPECs 2012-X38 & 2012-X51 -- 2012 XQ55, 2012 XK16, 2012 VF37
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2012-X49 -- 2012 XO55
C77Bernezzo Obs. in Italy, 1 in MPEC 2012-X51 -- 2012 XQ55
C12Berta Obs. in Spain, 1 in MPEC 2012-X51 -- 2012 XQ55
I58Betera Obs., 1 in MPEC 2012-X51 -- 2012 XQ55
703Catalina Sky Survey (CSS) in Arizona, 14 in MPECs 2012-X38, 2012-X39, 2012-X40, 2012-X48, 2012-X49 & 2012-X51 -- 2012 XQ55, 2012 XO55, 2012 XN55, 2012 XD55, 2012 XC55, 345705, 331963, 330825, 249886, 136793, 12711, 5828, 5646, 2212
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPECs 2012-X38, 2012-X39, 2012-X40, 2012-X41, 2012-X44, 2012-X48, 2012-X49, 2012-X50 & 2012-X52 -- 2012 XP55, 2012 XO55, 2012 XN55, 2012 XM16, 2012 XJ55, 2012 XH55, 2012 XE55, 2012 XD55, 2012 XC55, 2008 WM64, 2006 VA3, 5828
958Dax Obs. in France, 1 in MPEC 2012-X51 -- 2012 XQ55
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 3 in MPECs 2012-X41, 2012-X51 & 2012-X52 -- 2012 XQ55, 2012 XJ55, 2012 XE55
F655David Asher in Northern Ireland via Faulkes Telescope North in Hawaii, 4 in MPECs 2012-X38 & 2012-X41 -- 2012 XP2, 2012 XE55, 2011 DL19, 2009 YG
E108program code 8 via Faulkes Telescope South in New South Wales, 3 in MPEC 2012-X38 -- 2005 AN19, 2004 XN14, 1994 XD
203GiaGa Obs. in Italy, 3 in MPECs 2012-X38, 2012-X48 & 2012-X51 -- 2012 XQ55, 2012 XN55, 2012 XE54
J95Great Shefford Obs. in England, 9 in MPECs 2012-X38, 2012-X40, 2012-X41, 2012-X47, 2012-X48, 2012-X49, 2012-X50, 2012-X51 & 2012-X52 -- 2012 XQ55, 2012 XP55, 2012 XO55, 2012 XN55, 2012 XM55, 2012 XJ55, 2012 XE55, 2012 XE54, 2012 XD55
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2012-X41 -- 2012 XE55
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-X38 -- 3838
W85LCOGT Cerro Tololo A in Chile, 2 in MPECs 2012-X40 & 2012-X44 -- 2012 XH55, 2012 XD55
704LINEAR in New Mexico, 7 in MPECs 2012-X38, 2012-X39, 2012-X40, 2012-X41 & 2012-X52 -- 2012 XJ55, 2012 XE55, 2012 XD55, 2012 XC55, 330825, 5646, 2212
844Los Molinos Obs. in Uruguay, 1 in MPEC 2012-X38 -- 138937
C91Montevenere Obs., 4 in MPECs 2012-X38 & 2012-X51 -- 2012 XQ55, 2012 XE54, 345705, 1620
900Moriyama Obs. in Japan, 5 in MPECs 2012-X40, 2012-X41, 2012-X48, 2012-X49 & 2012-X51 -- 2012 XQ55, 2012 XO55, 2012 XN55, 2012 XE55, 2012 XD55
474Mt. John Obs. in New Zealand, 9 in MPECs 2012-X38, 2012-X40, 2012-X41 & 2012-X44 -- 2012 XZ6, 2012 XP2, 2012 XK16, 2012 XH55, 2012 XE55, 2012 XD55, 2012 XA, 2012 WP3, 2012 WL4
G96Mt. Lemmon Survey (MLS) in Arizona, 13 in MPECs 2012-X38, 2012-X39, 2012-X40, 2012-X45, 2012-X46, 2012-X47, 2012-X49, 2012-X50 & 2012-X52 -- 2012 XP55, 2012 XO55, 2012 XM55, 2012 XL55, 2012 XK55, 2012 XJ55, 2012 XD55, 2012 XC55, 2003 SL215, 2001 XP88, 25143, 22753, 159923
A24New Millennium Obs. in Italy, 6 in MPECs 2012-X39, 2012-X40, 2012-X41, 2012-X48, 2012-X49 & 2012-X51 -- 2012 XQ55, 2012 XO55, 2012 XN55, 2012 XE55, 2012 XD55, 2012 XC55
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2012-X38, 2012-X42, 2012-X43, 2012-X44, 2012-X45 & 2012-X52 -- 2012 XK55, 2012 XJ55, 2012 XH55, 2012 XG55, 2012 XF55, 2012 VP76, 2012 US136
H06RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-X51 -- 2012 XQ55
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-X41 -- 2012 XE55
461SZTE Asteroid Program in Hungary, 1 in MPEC 2012-X51 -- 2012 XQ55
854Sabino Canyon Obs. in Arizona, 6 in MPECs 2012-X39, 2012-X40, 2012-X41, 2012-X44, 2012-X48 & 2012-X51 -- 2012 XQ55, 2012 XN55, 2012 XH55, 2012 XE55, 2012 XD55, 2012 XC55
204Schiaparelli Obs. in Italy, 14 in MPECs 2012-X38, 2012-X39, 2012-X40, 2012-X41, 2012-X45, 2012-X47, 2012-X48, 2012-X49, 2012-X50, 2012-X51 & 2012-X52 -- 2012 XQ55, 2012 XP55, 2012 XO55, 2012 XN55, 2012 XM55, 2012 XK55, 2012 XJ55, 2012 XE55, 2012 XE54, 2012 XD55, 2012 XC55, 2012 WB25, 2006 WR127, 2004 SB20
G40Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2012-X51 -- 2012 XQ55
J84South Obs. in England, 3 in MPECs 2012-X38 & 2012-X51 -- 2012 XQ55, 2012 XE54, 4179
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-X52 -- 2012 XJ55
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2012-X38, 2012-X39, 2012-X40, 2012-X42, 2012-X43, 2012-X45, 2012-X46, 2012-X47, 2012-X48, 2012-X49 & 2012-X50 -- 2012 XP55, 2012 XO55, 2012 XN55, 2012 XM55, 2012 XL55, 2012 XK55, 2012 XH, 2012 XG55, 2012 XF55, 2012 XD55, 2012 XC55, 2005 RN33
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2012-X39, 2012-X40 & 2012-X51 -- 2012 XQ55, 2012 XD55, 2012 XC55
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-X38 -- 153958
I76Tesla Obs. in Spain, 2 in MPEC 2012-X38 -- 345705, 4179
718Wiggins Obs. in Utah, 1 in MPEC 2012-X51 -- 2012 XQ55
G28Wyncroft Obs., 2 in MPEC 2012-X38 -- 345705, 4179
J08Zonalunar Obs. in Spain, 1 in MPEC 2012-X51 -- 2012 XQ55
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 December '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2326 and JPL at 2304 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 XL55JPL Sentry23042036-206632.0e-07-7.25-7.390JPL: "Analysis based on 14 observations spanning 1.9794 days (2012-Dec-08.18943 to 2012-Dec-10.16884)." Diameter approximately 0.013 km. from mean, weighted H=27.0.
2012 XM16JPL Sentry16032058-210451.6e-06-6.21-6.480JPL: "Analysis based on 31 observations spanning 2.8351 days (2012-Dec-06.28107 to 2012-Dec-09.11617)." Diameter approximately 0.025 km. from mean, weighted H=25.7.
2012 XHJPL Sentry1603210114.5e-08-8.14-8.140JPL: "Analysis based on 24 observations spanning 6.0752 days (2012-Dec-03.17776 to 2012-Dec-09.25296)." Diameter approximately 0.024 km. from mean, weighted H=25.8.
NEODyS16032065-206519.0e-08-7.61-7.610NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2012-12-03.179 to 2012-12-09.254."

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 10 December '12

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

2316Updated Traffic Report
2304Noted that JPL Sentry has posted 2012 XL55 as an impact risk - see above
2131Grabbed MPEC 2012-X41 - 2012 XE55 - see above
Grabbed MPEC 2012-X42 - 2012 XF55 - see above
Grabbed MPEC 2012-X43 - 2012 XG55 - see above
Grabbed MPEC 2012-X44 - 2012 XH55 - see above
Grabbed MPEC 2012-X45 - 2012 XK55 - see above
Grabbed MPEC 2012-X46 - 2012 XL55 - see above
Grabbed MPEC 2012-X47 - 2012 XM55 - see above
Grabbed MPEC 2012-X48 - 2012 XN55 - see above
Grabbed MPEC 2012-X49 - 2012 XO55 - see above
Grabbed MPEC 2012-X50 - 2012 XP55 - see above
Grabbed MPEC 2012-X51 - 2012 XQ55 - see above
Grabbed MPEC 2012-X52 - 2012 XJ55 - see above
2032Grabbed MPEC 2012-X39 - 2012 XC55 - see above
Grabbed MPEC 2012-X40 - 2012 XD55 - see above
1603Noted that JPL Sentry has reposted 2012 XH as an impact risk - see above
Noted that NEODyS has updated its 2012 XH risk assessment - see above
Noted that JPL Sentry has updated its 2012 XM16 risk assessment - see above
Grabbed MPEC 2012-X38 - Daily Orbit Update - see above