Contents  on 12 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 12 December '12

Five objects reported inside ten LD

Five asteroids are reported traveling within ten lunar distances (LD) of Earth today. Inside Earth's Hill sphere, newly announced risk-listed intruder 2012 XB112 comes in from 2.65 to 1.77 LD and intruder 2012 XE54 exits Earth's Hill sphere, passing from 1.82 to 4.71 LD.

More distantly, risk-listed 2012 XL55 is outbound from 4.80 to 7.73 LD and 2009 BS5 is calculated with some uncertainty to be moving from 8.4 out to 8.6 LD, while 2012 XM55 is inbound from 8.17 to 7.57 LD.

Next up, risk-listed 2012 XM16 arrives inside ten LD tomorrow and 2012 XP55 arrives on December 26th.

This report was generated at 1950 UTC with new discoveries 2012 XB112 (MPEC) and departed 2012 XT111 (MPEC), and with follow-up in today's DOU MPEC for 2012 XE54, 2012 XM16, and departed 2012 XP2.


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 12 December '12

The MPC's NEO Confirmation Page has 27 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 27 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 56 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 12 December '12

Minor Planet Electronic Circulars

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


MPEC 2012-X70 - "17:17 UT" - Comet C/2012 X1 (LINEAR)


MPEC 2012-X69 - "13:37 UT" - 2012 XB112


MPEC 2012-X68 - "12:09 UT" - 2012 XT111


MPEC 2012-X67 - "12:07 UT" - 2012 XS111


MPEC 2012-X66 - "12:04 UT" - 2012 XR111


MPEC 2012-X65 - "12:01 UT" - 2012 XQ111


MPEC 2012-X64 - "11:58 UT" - 2012 XP111


MPEC 2012-X63 - "11:55 UT" - 2012 XO111


<< DOU on 12 Dec. '12 >>  MPEC 2012-X62 - "06:04 UT" - Daily Orbit Update

Observers  on 12 December '12

A total of 40 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPECs 2012-X62, 2012-X63, 2012-X64, 2012-X67, 2012-X69 & 2012-X70 -- 2012 XT93, 2012 XS111, 2012 XP111, 2012 XO111, 2012 XB112, C/2012 X1, 2012 VJ46, 2008 WH60
I27Barred Owl Obs., 1 in MPEC 2012-X62 -- 2012 XE54
B75Betelgeuse Station in Italy, 1 in MPEC 2012-X62 -- 2012 XQ55
B88Bigmuskie Obs. in Italy, 2 in MPEC 2012-X62 -- 2012 XE17, 3360
235CAST Obs. in Italy, 1 in MPEC 2012-X62 -- 4179
703Catalina Sky Survey (CSS) in Arizona, 11 in MPEC 2012-X62 -- 2012 XK16, 2012 JT17, 2012 JR17, 2010 XT45, 333358, 329669, 329275, 163683, 162900, 5836, 3838
470Ceccano Obs. in Italy, 1 in MPEC 2012-X70 -- C/2012 X1
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPEC 2012-X62 -- 2012 XP2, 2012 XH55, 2012 XG16, 2012 XD55, 2012 XC55, 2012 XA, 2012 TF53, 2012 PW, 88213
958Dax Obs. in France, 1 in MPEC 2012-X70 -- C/2012 X1
448Desert Moon Obs. in New Mexico, 3 in MPEC 2012-X62 -- 2012 XG16, 2012 VM82, 229672
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2012-X62 -- 2012 XQ55, 2012 XN55
J19El Maestrat Obs. in Spain, 1 in MPEC 2012-X62 -- 192563
D08Ghezz Obs., 1 in MPEC 2012-X62 -- 4179
J95Great Shefford Obs. in England, 1 in MPEC 2012-X70 -- C/2012 X1
704LINEAR in New Mexico, 10 in MPECs 2012-X62, 2012-X67 & 2012-X70 -- 2012 XS111, 2012 XQ55, C/2012 X1, 2008 XE2, 345705, 17182, 138852, 5646, 2212, 1620
J38La Vara Obs. in Spain, 1 in MPEC 2012-X62 -- 4179
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2012-X63, 2012-X64, 2012-X65, 2012-X66, 2012-X67, 2012-X68 & 2012-X70 -- 2012 XT111, 2012 XS111, 2012 XR111, 2012 XQ111, 2012 XP111, 2012 XO111, C/2012 X1
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-X62 -- 2012 PN
711McDonald Obs. in Texas, 4 in MPECs 2012-X62, 2012-X63, 2012-X65 & 2012-X67 -- 2012 XS111, 2012 XQ111, 2012 XO111, 2002 AY1
C91Montevenere Obs., 1 in MPEC 2012-X62 -- 2012 VF37
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2012-X62, 2012-X63, 2012-X64, 2012-X68 & 2012-X69 -- 2012 XT111, 2012 XP111, 2012 XO111, 2012 XB112, 2012 WB25, 2012 VZ25, 2012 TQ139, 2004 XL29, 1994 XD, 136795
A13Naef Obs. in Switzerland, 1 in MPEC 2012-X62 -- 2000 WL63
I89Nerpio Obs. in Italy, 1 in MPEC 2012-X62 -- 4179
A24New Millennium Obs. in Italy, 1 in MPEC 2012-X67 -- 2012 XS111
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2012-X62, 2012-X65, 2012-X66 & 2012-X67 -- 2012 XS111, 2012 XR111, 2012 XQ111, 2005 EY, 68548
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2012-X62 -- 2012 QF49
C63Piazzi Obs., 3 in MPEC 2012-X62 -- 2000 WL63, 192563, 17188
H06*Rolando Ligustri in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-X70 -- C/2012 X1
H06`Erik Bryssinck in Belgium via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-X70 -- C/2012 X1
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-X70 -- C/2012 X1
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2012-X70 -- C/2012 X1
H36Sandlot Obs. in Kansas, 3 in MPECs 2012-X63, 2012-X66 & 2012-X69 -- 2012 XR111, 2012 XO111, 2012 XB112
204Schiaparelli Obs. in Italy, 3 in MPECs 2012-X67, 2012-X68 & 2012-X70 -- 2012 XT111, 2012 XS111, C/2012 X1
645Sloan Digital Sky Survey (SDSS) in New Mexico, 2 in MPEC 2012-X62 -- 2012 SF51, 2012 LT7
J84South Obs. in England, 1 in MPEC 2012-X62 -- 2012 XM16
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2012-X62 -- 2012 XF17, 329614, 329338, 4486
291Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2012-X62, 2012-X63, 2012-X64, 2012-X65, 2012-X66 & 2012-X67 -- 2012 XS111, 2012 XR111, 2012 XQ111, 2012 XP111, 2012 XO111, 2012 XM16, 2012 XF55, 2012 TW78
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-X67 -- 2012 XS111
2905Richard P. Boyle via Vatican Advanced Technology Telescope in Arizona, 1 in MPEC 2012-X62 -- 2012 XH16
A48Verona Obs. in Italy, 2 in MPEC 2012-X62 -- 2012 XQ55, 2012 XK16
C44Volta Obs. in Italy, 1 in MPEC 2012-X67 -- 2012 XS111
G33Wickede Obs., 1 in MPEC 2012-X62 -- 4179
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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 XB112JPL Sentry17182043-2105441.7e-04-6.40-6.740JPL: "Analysis based on 17 observations spanning .87702 days (2012-Dec-11.37996 to 2012-Dec-12.25698)." Diameter approximately 0.004 km. from mean, weighted H=29.9.
2012 XO111JPL Sentry14142062-208069.7e-08-5.24-5.480JPL: "Analysis based on 24 observations spanning 2.0567 days (2012-Dec-10.11829 to 2012-Dec-12.17502)." Diameter approximately 0.220 km. from mean, weighted H=21.0.
NEODyS14142050-208091.53e-06-3.99-4.610NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2012-12-10.119 to 2012-12-12.176."
2012 XM16JPL Sentry1414208111.7e-06-6.22-6.220JPL: "Analysis based on 41 observations spanning 5.9456 days (2012-Dec-06.28107 to 2012-Dec-12.22671)." Diameter approximately 0.024 km. from mean, weighted H=25.7.
NEODyS14142081-209532.76e-06-6.02-6.040NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2012-12-06.282 to 2012-12-12.227."

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 12 December '12

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

1950Generated Traffic Report
1807Grabbed MPEC 2012-X70 - Comet C/2012 X1 (LINEAR) - see above
1718Noted that JPL Sentry has posted 2012 XB112 as an impact risk - see above
1414Noted 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 posted 2012 XO111 as an impact risk - see above
Noted that NEODyS has posted 2012 XO111 as an impact risk - see above
Grabbed MPEC 2012-X62 - Daily Orbit Update - see above
Grabbed MPEC 2012-X63 - 2012 XO111 - see above
Grabbed MPEC 2012-X64 - 2012 XP111 - see above
Grabbed MPEC 2012-X65 - 2012 XQ111 - see above
Grabbed MPEC 2012-X66 - 2012 XR111 - see above
Grabbed MPEC 2012-X67 - 2012 XS111 - see above
Grabbed MPEC 2012-X68 - 2012 XT111 - see above
Grabbed MPEC 2012-X69 - 2012 XB112 - see above