Contents  on 3 February '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 3 February '13

Three objects reported inside ten LD

Three visitors are reported to be within ten lunar distances (LD) of Earth today. Newly announced risk-listed intruder 2013 CY exits Earth's Hill sphere, gliding from 3.55 to 4.12 LD. Out further, 2013 BA74 is inbound from 7.00 to 5.85 LD and radar target 2013 BS45 from 7.91 to 7.37 LD.

Next known to be coming around are 2013 BV15 and intruder 2012 DA14 (risk-listed radar target), which both arrive inside ten LD on February 8th.

This report was updated at 1658 UTC to note first follow-up for 2013 BA74 in today's DOU MPEC along with observation of 2013 BS45 and 2013 BV15. Today's first traffic report was generated at 0103 UTC with info about 2013 CY, the discovery of which was announced late yesterday (MPEC), and which passed Earth at 0.90 LD on January 28th.

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 3 February '13

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of nineteen 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 3 February '13

Minor Planet Electronic Circulars

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

<< DOU on 3 Feb. '13 >>  MPEC 2013-C13 - "06:02 UT" - Daily Orbit Update

MPEC 2013-C12 - "01:51 UT" - 2013 BL76

Observers  on 3 February '13

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
Z74Amanecer de Arrakis Obs., 1 in MPEC 2013-C13 -- 4179
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2013-C13 -- 2013 BE19
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2013-C13 -- 2013 AU76, 2010 XL69, 338049, 177049, 162011, 1862
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPEC 2013-C13 -- 2013 BW2, 2013 BN18, 2013 BD70, 2013 BC74, 2013 AQ27, 2012 XQ55, 2012 QQ50, 2012 QO10, 2003 CN17
448Desert Moon Obs. in New Mexico, 4 in MPEC 2013-C13 -- 2013 BY45, 2013 BD70, 2012 YK7, 152952
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-C13 -- 2013 BE19
I57Elche Obs., 1 in MPEC 2013-C13 -- 99942
C40Kuban State Univ. Obs. in Russia, 1 in MPEC 2013-C13 -- 99942
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2013-C12 & 2013-C13 -- 2013 BL76, 2013 BE74
711McDonald Obs. in Texas, 1 in MPEC 2013-C12 -- 2013 BL76
900Moriyama Obs. in Japan, 1 in MPEC 2013-C13 -- 2013 BA74
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-C12 -- 2013 BL76
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2013-C12 & 2013-C13 -- 2013 BL76, 39796, 348776, 153249
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2013-C13 -- 2013 BV15, 2013 AW52, 2012 XF112, 2010 QD2, 99942
204Schiaparelli Obs. in Italy, 1 in MPEC 2013-C12 -- 2013 BL76
J84South Obs. in England, 2 in MPEC 2013-C13 -- 2013 BA74, 99942
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2013-C12 & 2013-C13 -- 2013 BZ45, 2013 BU15, 2013 BS45, 2013 BP45, 2013 BL76, 2013 BK18, 2013 AP27, 2013 AE69, 2012 YJ8
954Teide Obs. in the Canary Islands, 1 in MPEC 2013-C13 -- 2013 AQ27
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-C13 -- 190161
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-C12 -- 2013 BL76
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 February '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
2013 CYNEODyS16562069-209273.22e-06-7.43-8.150NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2013-02-01.350 to 2013-02-02.610."
JPL Sentry01022069-209293.6e-06-7.41-8.100JPL: "Analysis based on 35 observations spanning 1.2601 days (2013-Feb-01.34874 to 2013-Feb-02.60884)." Diameter approximately 0.008 km. from mean, weighted H=28.3.

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 3 February '13

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

1658Updated Traffic Report
1656Noted that NEODyS has posted 2013 CY as an impact risk - see above
Grabbed MPEC 2013-C13 - Daily Orbit Update - see above
0434Grabbed MPEC 2013-C12 - 2013 BL76 - see above
0102Noted that JPL Sentry has posted 2013 CY as an impact risk - see above