Contents  on 1 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 1 February '13

Two objects reported inside ten LD

Two asteroids are reported passing within ten lunar distances (LD) of Earth today. Newly announced 2013 BA74 is inbound from 9.70 to 8.30 LD and radar target 2013 BS45 from 9.05 to 8.47 LD.

Our next known close visitors 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 2134 UTC with new discoveries 2013 BA74 (MPEC) and already departed 2013 BD74 (MPEC) and 2013 BB74 (MPEC). Today's first traffic report was generated at 1732 UTC with follow-up in today's DOU MPEC for 2013 BS45.

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 1 February '13

The MPC's NEO Confirmation Page has 21 listings

When last checked at 2238 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 21 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 36 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 1 February '13

Minor Planet Electronic Circulars

As of last check at 2238 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-C06 - "19:33 UT" - 2013 BB74

MPEC 2013-C05 - "19:28 UT" - 2013 BE74

MPEC 2013-C04 - "19:24 UT" - 2013 BD74

MPEC 2013-C03 - "19:19 UT" - 2013 BC74

MPEC 2013-C02 - "19:14 UT" - 2013 BA74

<< DOU on 1 Feb. '13 >>  MPEC 2013-C01 - "06:02 UT" - Daily Orbit Update

Observers  on 1 February '13

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

CodeObserver / observatory
Z74Amanecer de Arrakis Obs., 1 in MPEC 2013-C01 -- 4179
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2013-C01 -- 249886
I74Baxter Garden Obs. in England, 1 in MPEC 2013-C01 -- 262623
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2013-C01 -- 2012 SQ56
C12Berta Obs. in Spain, 1 in MPEC 2013-C01 -- 2013 BE19
703Catalina Sky Survey (CSS) in Arizona, 15 in MPECs 2013-C01, 2013-C02, 2013-C03, 2013-C04 & 2013-C06 -- 2013 BD74, 2013 BC74, 2013 BB74, 2013 BA74, 2013 AY52, 2013 AU76, 2009 YG, 2009 BL2, 343098, 276397, 25916, 22753, 138175, 137925, 3908
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPEC 2013-C01 -- 2013 BP18, 2013 BO45, 2013 AG76, 2013 AB53, 2012 QP10, 2010 DE, 2009 AV, 2005 LY19, 2005 DD, 152558, 138947
448Desert Moon Obs. in New Mexico, 4 in MPEC 2013-C01 -- 2013 AU76, 2002 DU3, 222165, 141447
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 3 in MPECs 2013-C01, 2013-C03 & 2013-C04 -- 2013 BE19, 2013 BD74, 2013 BC74
711McDonald Obs. in Texas, 1 in MPEC 2013-C01 -- 2013 BS45
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2013-C01, 2013-C02, 2013-C03, 2013-C04, 2013-C05 & 2013-C06 -- 2013 BE74, 2013 BD74, 2013 BC74, 2013 BB74, 2013 BA74, 2003 BN4, 25143, 3908
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2013-C01 -- 2013 AU76, 2010 XL69, 2005 SG19, 138175
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 9 in MPEC 2013-C01 -- 2013 BU15, 2013 BE19, 2013 AW52, 2013 AT76, 2012 XF112, 2012 QP17, 2010 QD2, 99942, 4179
H36Sandlot Obs. in Kansas, 6 in MPECs 2013-C01, 2013-C02, 2013-C03, 2013-C04 & 2013-C05 -- 2013 BS45, 2013 BE74, 2013 BD74, 2013 BC74, 2013 BA74, 2013 AS27
204Schiaparelli Obs. in Italy, 1 in MPEC 2013-C01 -- 2013 BS45
J84South Obs. in England, 1 in MPEC 2013-C01 -- 99942
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2013-C01 & 2013-C05 -- 2013 BE74, 198752, 177016, 5189
291Spacewatch 1.8m telescope in Arizona, 20 in MPECs 2013-C01, 2013-C02, 2013-C03, 2013-C05 & 2013-C06 -- 2013 BU15, 2013 BT45, 2013 BT18, 2013 BS45, 2013 BS18, 2013 BR45, 2013 BO45, 2013 BJ18, 2013 BF27, 2013 BE74, 2013 BE27, 2013 BC74, 2013 BC70, 2013 BB74, 2013 BA74, 2013 AX52, 2013 AO27, 2013 AG76, 2013 AB53, 2012 YO1
954Teide Obs. in the Canary Islands, 2 in MPECs 2013-C03 & 2013-C04 -- 2013 BD74, 2013 BC74
Q624program code 4 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-C01 -- 2013 AU27
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 February '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2238 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 BP73NEODyS17302063-2100395.89e-06-2.83-3.20NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2013-01-22.244 to 2013-01-31.202."
2013 BC70JPL Sentry1730202813.1e-07-5.69-5.690JPL: "Analysis based on 16 observations spanning 9.0703 days (2013-Jan-22.32357 to 2013-Jan-31.39383)." Diameter approximately 0.044 km. from mean, weighted H=24.4.
NEODyS17302028-202816.3e-07-5.39-5.390NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2013-01-22.324 to 2013-01-31.395."
2013 BJ18JPL Sentry1730R E M O V E DJPL: Risk listing removed at 0950 UTC.

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 1 February '13

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

2134Updated Traffic Report
1946Grabbed MPEC 2013-C03 - 2013 BC74 - see above
Grabbed MPEC 2013-C04 - 2013 BD74 - see above
Grabbed MPEC 2013-C05 - 2013 BE74 - see above
Grabbed MPEC 2013-C06 - 2013 BB74 - see above
1917Grabbed MPEC 2013-C02 - 2013 BA74 - see above
1730Noted that JPL Sentry has updated its 2013 BC70 risk assessment - see above
Noted that NEODyS has updated its 2013 BC70 risk assessment - see above
Noted that JPL Sentry has removed 2013 BJ18 as an impact risk - see above
Noted that NEODyS has posted 2013 BP73 as an impact risk - see above
Grabbed MPEC 2013-C01 - Daily Orbit Update - see above