Contents  on 7 January '13

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 January '13

Two objects reported inside ten LD

There are two asteroids reported traveling inside ten lunar distances (LD) of Earth today. 2013 AD4 is outbound from 8.48 to 9.89 LD and radar target 2012 XM55 leaves ten LD, moving from 9.45 to 10.05 LD.

Coming our way next, 2013 AB4 arrives inside ten LD tomorrow and, next known after that, intruder 2012 DA14 (risk-listed radar target) arrives on February 8th.

This report was generated at 1537 UTC with follow-up in today's DOU MPEC for departed objects 2012 XB133 and risk-delisted 2012 XH (doubling its observing arc to 34 days).


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 January '13

The MPC's NEO Confirmation Page has 24 listings

When last checked at 2320 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 24 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 45 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 January '13

Minor Planet Electronic Circulars

As of last check at 2320 UTC, there have been seven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2013-A36 - "19:09 UT" - 2013 AP20


MPEC 2013-A35 - "19:06 UT" - 2013 AO20


MPEC 2013-A34 - "19:02 UT" - 2013 AN20


MPEC 2013-A33 - "18:15 UT" - 2013 AM20


MPEC 2013-A32 - "18:13 UT" - 2013 AL20


MPEC 2013-A31 - "18:10 UT" - 2013 AK20


<< DOU on 7 Jan. '13 >>  MPEC 2013-A30 - "06:03 UT" - Daily Orbit Update

Observers  on 7 January '13

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2013-A30, 2013-A31, 2013-A32, 2013-A33, 2013-A35 & 2013-A36 -- 2013 AP20, 2013 AO20, 2013 AM20, 2013 AL20, 2013 AK20, 2012 XS134, 5828
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2013-A30 -- 4179
300Bisei Spaceguard Center in Japan, 1 in MPEC 2013-A34 -- 2013 AN20
160Castelmartini Obs. in Italy, 9 in MPEC 2013-A30 -- 2012 YO1, 2012 XC112, 2010 BB, 330825, 323179, 277127, 276397, 262623, 4179
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2013-A30 & 2013-A34 -- 2013 AN20, 2010 BB, 2004 XL29, 96315, 338049, 276397, 175706, 163364, 144411, 137199, 12711, 11284, 3908
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPEC 2013-A30 -- 2013 AH11, 2012 YK7, 2012 XZ6, 2012 XM145, 2012 XD55, 2012 XD133, 2012 XC55, 2012 XC133, 2012 TZ52, 2011 HL7
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-A34 -- 2013 AN20
E102Ernesto Guido in Italy via Faulkes Telescope South in New South Wales, 2 in MPECs 2013-A34 & 2013-A35 -- 2013 AO20, 2013 AN20
157Frasso Sabino Obs. in Italy, 4 in MPEC 2013-A30 -- 2012 YO3, 2012 YN6, 2012 XY6, 138859
D95Kurihara Obs. in Japan, 1 in MPEC 2013-A30 -- 4179
704LINEAR in New Mexico, 5 in MPECs 2013-A30, 2013-A34 & 2013-A35 -- 2013 AO20, 2013 AN20, 2013 AH11, 11405, 2062
G38La Senda Obs., 1 in MPEC 2013-A30 -- 2012 XF112
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2013-A30, 2013-A31, 2013-A32, 2013-A33 & 2013-A36 -- 2013 AP20, 2013 AM20, 2013 AL20, 2013 AK20, 2012 XH
900Moriyama Obs. in Japan, 1 in MPEC 2013-A34 -- 2013 AN20
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2013-A31, 2013-A32, 2013-A33 & 2013-A36 -- 2013 AP20, 2013 AM20, 2013 AL20, 2013 AK20
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 3 in MPEC 2013-A30 -- 2012 XF112, 2012 QF49, 2010 BB
461SZTE Asteroid Program in Hungary, 1 in MPEC 2013-A34 -- 2013 AN20
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2013-A31 -- 2013 AK20
B74Santa Maria de Montmagastrell Obs. in Spain, 2 in MPECs 2013-A30 & 2013-A31 -- 2013 AK20, 2012 XC112
204Schiaparelli Obs. in Italy, 11 in MPECs 2013-A30 & 2013-A31 -- 2013 AK20, 2012 YQ1, 2012 YO3, 2012 XD133, 2012 VF37, 2011 WS2, 2011 DL19, 2010 TS149, 2003 BT35, 2002 AY1, 348461
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2013-A30 -- 2010 QD2, 1998 QR15, 39572, 330809, 22753, 137078
291Spacewatch 1.8m telescope in Arizona, 15 in MPECs 2013-A30, 2013-A31, 2013-A32 & 2013-A33 -- 2013 AM20, 2013 AL20, 2013 AK20, 2012 YY6, 2012 YP6, 2012 XS93, 2012 XQ111, 2012 XH16, 2012 XD17, 2012 XB133, 2012 WG32, 2012 VZ4, 2012 RO1, 2012 QF42, 2009 WO106
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 January '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2320 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 YR1NEODyS15352035-209863.63e-05-5.43-5.630NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2012-12-20.210 to 2013-01-05.277."
2012 YQ1JPL Sentry1535210614.8e-09-6.64-6.640JPL: "Analysis based on 66 observations spanning 17.283 days (2012-Dec-19.23613 to 2013-Jan-05.51888)." Diameter approximately 0.220 km. from mean, weighted H=21.0.
2012 XHJPL Sentry1535R E M O V E DJPL: Risk listing removed at 0955 UTC.
NEODyS1535R E M O V E D-

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 January '13

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

2007Grabbed MPEC 2013-A34 - 2013 AN20 - see above
Grabbed MPEC 2013-A35 - 2013 AO20 - see above
Grabbed MPEC 2013-A36 - 2013 AP20 - see above
1852Grabbed MPEC 2013-A31 - 2013 AK20 - see above
Grabbed MPEC 2013-A32 - 2013 AL20 - see above
Grabbed MPEC 2013-A33 - 2013 AM20 - see above
1537Generated Traffic Report
1535Noted that JPL Sentry has removed 2012 XH as an impact risk - see above
Noted that NEODyS has removed 2012 XH as an impact risk - see above
Noted that JPL Sentry has updated its 2012 YQ1 risk assessment - see above
Noted that NEODyS has updated its 2012 YR1 risk assessment - see above
Grabbed MPEC 2013-A30 - Daily Orbit Update - see above