Contents  on 5 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 5 January '13

One object reported inside ten LD

One object is reported to be within ten lunar distances (LD) of Earth today. Radar target 2012 XM55 is outbound from 8.25 to 8.85 LD.

Next up, newly announced 2013 AB4 arrives inside ten LD on January 8th and intruder 2012 DA14 (risk-listed radar target) arrives on February 8th.

This report was updated at 2344 UTC with new discoveries 2013 AB4 (MPEC) and departed 2013 AC4 (MPEC). There is a third discovery of a close passer, 2013 AD4 (MPEC), for which JPL has not posted an orbit solution, thus we have not yet updated pages needing JPL's sky position data. Today's first report was generated at 1613 UTC with follow-up for departed 2012 XJ134 in today's DOU MPEC.

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 5 January '13

The MPC's NEO Confirmation Page has 15 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fifteen objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 29 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 5 January '13

Minor Planet Electronic Circulars

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

MPEC 2013-A21 - "18:53 UT" - Editorial Notice

MPEC 2013-A20 - "17:37 UT" - 2013 AE4

MPEC 2013-A19 - "17:34 UT" - 2013 AD4

MPEC 2013-A18 - "17:29 UT" - 2013 AC4

MPEC 2013-A17 - "17:26 UT" - 2013 AB4

MPEC 2013-A16 - "17:23 UT" - 2012 YJ8

<< DOU on 5 Jan. '13 >>  MPEC 2013-A15 - "06:02 UT" - Daily Orbit Update

MPEC 2013-A14 - "02:30 UT" - Comet C/2013 A1 (Siding Spring)

Observers  on 5 January '13

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-A14 -- C/2013 A1
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2013-A15, 2013-A16 & 2013-A20 -- 2013 AE4, 2012 YQ3, 2012 YJ8, 2012 YD7, 2012 XQ93, 2012 XF17, 2012 XF112, 2012 XE112, 88213
C77Bernezzo Obs. in Italy, 1 in MPEC 2013-A19 -- 2013 AD4
300Bisei Spaceguard Center in Japan, 2 in MPECs 2013-A14 & 2013-A19 -- 2013 AD4, C/2013 A1
160Castelmartini Obs. in Italy, 3 in MPEC 2013-A15 -- 2012 TJ146, 2010 BB, 323179
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2013-A14, 2013-A15 & 2013-A19 -- 2013 AD4, C/2013 A1, 175706, 162900, 152742, 138937, 5836
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2013-A14 & 2013-A15 -- C/2013 A1, 2012 PQ28
821Cordoba Obs. Bosque Alegre Station in Argentina, 1 in MPEC 2013-A14 -- C/2013 A1
B50Corner Obs. in Germany, 1 in MPEC 2013-A15 -- 4179
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2013-A14 -- C/2013 A1
958Dax Obs. in France, 1 in MPEC 2013-A19 -- 2013 AD4
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2013-A15 -- 2012 YO3, 2012 YN6
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2013-A14 -- C/2013 A1
J87La Canada Obs. in Spain, 1 in MPEC 2013-A14 -- C/2013 A1
G38La Senda Obs., 2 in MPEC 2013-A15 -- 330825, 2062
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2013-A16, 2013-A19 & 2013-A20 -- 2013 AE4, 2013 AD4, 2012 YJ8
900Moriyama Obs. in Japan, 1 in MPEC 2013-A19 -- 2013 AD4
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2013-A15, 2013-A17, 2013-A18 & 2013-A20 -- 2013 AE4, 2013 AC4, 2013 AB4, 203471
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2013-A15 -- 162004
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2013-A16 -- 2012 YJ8
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-A19 -- 2013 AD4
E12Siding Spring Survey in New South Wales, 1 in MPEC 2013-A14 -- C/2013 A1
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2013-A15 -- 2005 RN33, 2002 AW, 190161, 177614
291Spacewatch 1.8m telescope in Arizona, 20 in MPECs 2013-A15, 2013-A16, 2013-A17 & 2013-A18 -- 2013 AC4, 2013 AB4, 2012 YY6, 2012 YP6, 2012 YP3, 2012 YO1, 2012 YN6, 2012 YJ8, 2012 XR93, 2012 XR134, 2012 XQ111, 2012 XO111, 2012 XM145, 2012 XJ134, 2012 XF133, 2012 XE133, 2012 XA133, 2012 VY4, 2012 VN82, 1999 UR
I76Tesla Obs. in Spain, 1 in MPEC 2013-A15 -- 2012 XE112
Q621program code 1 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-A14 -- C/2013 A1
Q622program code 2 via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2013-A14 & 2013-A19 -- 2013 AD4, C/2013 A1
Q624program code 4 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-A19 -- 2013 AD4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 January '13

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.





Notes for Today's Latest Risk Assessments
2012 XE133JPL Sentry16112083-209132.6e-08-7.04-7.350JPL: "Analysis based on 91 observations spanning 23.689 days (2012-Dec-12.43361 to 2013-Jan-05.12216)." Diameter approximately 0.071 km. from mean, weighted H=23.4.

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 5 January '13

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

2344Updated Traffic Report
2001Grabbed MPEC 2013-A21 - Editorial Notice - see above
1747Grabbed MPEC 2013-A16 - 2012 YJ8 - see above
Grabbed MPEC 2013-A17 - 2013 AB4 - see above
Grabbed MPEC 2013-A18 - 2013 AC4 - see above
Grabbed MPEC 2013-A19 - 2013 AD4 - see above
Grabbed MPEC 2013-A20 - 2013 AE4 - see above
1611Noted that JPL Sentry has updated its 2012 XE133 risk assessment - see above
Grabbed MPEC 2013-A15 - Daily Orbit Update - see above
0505Grabbed MPEC 2013-A14 - Comet C/2013 A1 (Siding Spring) - see above