Contents  on 6 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 6 February '13

Four objects reported inside ten LD

Four visitors are reported to be within a radius of ten lunar distances (LD) from our home planet today. 2013 BA74 comes its closest to Earth on this passage, reaching 4.48 LD at 0800 UT. Risk-listed intruder 2013 CY is outbound from 5.27 to 5.85 LD and radar target 2013 BS45 is inbound from 6.40 to 5.98 LD, while newly announced risk-listed 2013 CL22 leaves ten LD, traveling from 8.02 to 10.16 LD.

Approaching our neighborhood next, 2013 BV15 and intruder 2012 DA14 (risk-listed radar target) arrive inside ten LD on February 8th.

This report was updated at 2117 UTC with new discovery 2013 CL22 (MPEC). This day's first traffic report was generated at 1725 UTC with follow-up in today's DOU MPEC for 2013 CY, 2013 BA74, and 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 6 February '13

The MPC's NEO Confirmation Page has 23 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 23 objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 38 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 6 February '13

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-C25 - "20:55 UT" - P/2004 H2 = 2013 C1 (Larsen)

MPEC 2013-C24 - "18:26 UT" - 2013 CL22

MPEC 2013-C23 - "17:53 UT" - 2006 WS1

MPEC 2013-C22 - "16:18 UT" - 2006 BA9

<< DOU on 6 Feb. '13 >>  MPEC 2013-C21 - "06:02 UT" - Daily Orbit Update

MPEC 2013-C20 - "02:30 UT" - 2013 BK78

Observers  on 6 February '13

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2013-C21 & 2013-C24 -- 2013 CL22, 2013 BY45, 2013 BC18, 2013 AW60, 2012 YQ3
I99Blanquita Obs. in Spain, 2 in MPEC 2013-C21 -- 11405, 4179
703Catalina Sky Survey (CSS) in Arizona, 14 in MPECs 2013-C21 & 2013-C23 -- 2013 BD70, 2013 AQ27, 2012 CD29, 2006 WS1, 2003 CN17, 1999 VF22, 54686, 24761, 212359, 154715, 141354, 7480, 5693, 1864
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPEC 2013-C21 -- 2013 CY, 2013 BC74, 2012 YN6, 2008 WJ60
958Dax Obs. in France, 2 in MPECs 2013-C23 & 2013-C24 -- 2013 CL22, 2006 WS1
448Desert Moon Obs. in New Mexico, 5 in MPEC 2013-C21 -- 2013 AA32, 2011 BK24, 2007 YX1, 222165, 185853
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-C23 -- 2006 WS1
F65Faulkes Telescope North in Hawaii, 1 in MPEC 2013-C20 -- 2013 BK78
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2013-C23 -- 2006 WS1
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2013-C21 -- 22753
J75La Sagra Obs. in Spain, 1 in MPEC 2013-C24 -- 2013 CL22
5682David Tholen's team on Mauna Kea in Hawaii, 3 in MPECs 2013-C20 & 2013-C21 -- 2013 BK78, 2013 BF27, 2013 BC18
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2013-C20 -- 2013 BK78
711McDonald Obs. in Texas, 1 in MPEC 2013-C21 -- 2013 BS45
474Mt. John Obs. in New Zealand, 14 in MPECs 2013-C21 & 2013-C23 -- 2013 BU2, 2013 BT45, 2013 BP18, 2013 BE19, 2013 BC74, 2013 BA74, 2013 AU27, 2013 AT76, 2013 AO20, 2013 AM60, 2013 AH11, 2012 XM145, 2006 WS1, 2005 RZ2
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2013-C21 & 2013-C23 -- 2012 YK7, 2006 WS1, 26166, 229007, 168378
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2013-C20 & 2013-C21 -- 2013 BK78, 214869, 198856, 154347, 137199, 12538
B49Paus Obs. in Spain, 1 in MPEC 2013-C24 -- 2013 CL22
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-C21, 2013-C22 & 2013-C24 -- 2013 CL22, 2013 AS27, 2006 BA9
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2013-C21 -- 2008 CR118, 68278
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2013-C21 & 2013-C25 -- 2013 CY, P/2013 C1, 2013 BT18, 2013 BP73, 2013 BE74, 2013 BE18, 2013 AV60, 2012 XH16, 2012 VL6
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-C21 -- 85990
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-C24 -- 2013 CL22
H06%Ernesto Guido in Italy via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-C24 -- 2013 CL22
Q624program code 4 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-C24 -- 2013 CL22
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 February '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 and JPL at 2358 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 CL22JPL Sentry2050206435.1e-06-5.24-5.350JPL: "Analysis based on 42 observations spanning 1.3951 days (2013-Feb-05.05792 to 2013-Feb-06.45298)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
2013 CYJPL Sentry17212072-210083.9e-06-7.38-8.030JPL: "Analysis based on 57 observations spanning 4.1370 days (2013-Feb-01.34874 to 2013-Feb-05.48573)." Diameter approximately 0.007 km. from mean, weighted H=28.3.
NEODyS17212058-2094114.33e-06-7.29-7.890NEODyS: "Based on 57 optical observations (of which 0 are rejected as outliers) from 2013-02-01.350 to 2013-02-05.487."
2013 BP73JPL Sentry17212078-2105231.6e-05-2.41-2.750JPL: "Analysis based on 20 observations spanning 14.152 days (2013-Jan-22.24343 to 2013-Feb-05.39545)." Diameter approximately 0.310 km. from mean, weighted H=20.2.
NEODyS17212078-2100241.44e-05-2.45-2.780NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2013-01-22.244 to 2013-02-05.396."
2012 DA14NEODyS17212076-209681.16e-05-4.95-5.110NEODyS: "Based on 197 optical observations (of which 4 are rejected as outliers) from 2012-02-23.029 to 2013-01-11.088."
JPL Sentry01162080-210767.4e-06-5.14-5.220JPL: "Analysis based on 194 observations spanning 323.05 days (2012-Feb-23.03431 to 2013-Jan-11.0873)." Diameter approximately 0.046 km. from mean, weighted H=24.4.

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 6 February '13

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

2121Grabbed MPEC 2013-C25 - P/2004 H2 = 2013 C1 (Larsen) - see above
2117Updated Traffic Report
2050Noted that JPL Sentry has posted 2013 CL22 as an impact risk - see above
1900Grabbed MPEC 2013-C24 - 2013 CL22 - see above
1810Grabbed MPEC 2013-C23 - 2006 WS1 - see above
1721Noted that NEODyS has updated its 2012 DA14 risk assessment - see above
Noted that JPL Sentry has updated its 2013 BP73 risk assessment - see above
Noted that NEODyS has updated its 2013 BP73 risk assessment - see above
Noted that JPL Sentry has updated its 2013 CY risk assessment - see above
Noted that NEODyS has updated its 2013 CY risk assessment - see above
Grabbed MPEC 2013-C21 - Daily Orbit Update - see above
Grabbed MPEC 2013-C22 - 2006 BA9 - see above
0250Grabbed MPEC 2013-C20 - 2013 BK78 - see above
0116Noted that JPL Sentry has updated its 2012 DA14 risk assessment - see above