Contents  on 15 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 15 February '13

Five objects reported inside ten LD

There are five visitors reported to be inside ten lunar distances (LD) of Earth today. Intruder 2012 DA14 (risk-listed radar target) spends most of the day inside the Earth-Moon system, coming in from 1.18 and going out to 0.30 LD, reaching 0.09 LD at 1925 UT.

Out further, radar target 2013 BV15 is outbound from 4.85 to 6.20 LD and radar target 2013 BS45 from 5.28 to 5.58 LD, while 2013 CE82 is inbound from 9.20 to 6.80 LD and 2013 CZ87 from 9.62 to 8.62 LD.

Next known to be approaching is risk-listed 2007 EO88, which arrives inside ten LD on March 15th.

World news: A tiny object entered Earth's atmosphere over the city of Chelyabinsk in Russia this morning local time, with the resulting shockwave causing structural damage and injuring around a thousand people according to news reports. NASA has issued a statement that this event is unrelated to 2012 DA14 and its close Earth passage today. See Phil Plait's blog and this update at Slate and Emily Lakdawalla's blog at The Planetary Society for info and links. Late addition: See Peter Brown's report reposted to the MPML with confirmation that this is probably the largest recorded such event since Tunguska in 1908.

This report was updated at 1925 UTC with discovery of recently departed 2013 CN118 (MPEC). Today's first traffic report was generated at 1709 UTC with follow-up for 2012 DA14 (MPEC). A DOU MPEC hasn't been posted yet today.

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 15 February '13

The MPC's NEO Confirmation Page has 62 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 62 objects listed. Of these, 41 were "one nighters." So far The Tracking News has counted a total of 73 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 15 February '13

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts. No Daily Orbit Update DOU MPEC has been posted yet, so visit the MPC Status Page for possible explanation.

MPEC 2013-C77 - "17:19 UT" - 2013 CN118

MPEC 2013-C76 - "17:14 UT" - 2013 CM118

MPEC 2013-C75 - "17:09 UT" - 2013 CL118

MPEC 2013-C74 - "16:50 UT" - 2002 LY1

MPEC 2013-C73 - "16:13 UT" - 2013 CJ118

MPEC 2013-C72 - "14:26 UT" - 2012 DA14

Observers  on 15 February '13

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-C72 -- 2012 DA14
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2013-C74, 2013-C76 & 2013-C77 -- 2013 CN118, 2013 CM118, 2002 LY1
I47Auger Obs. in Argentina, 1 in MPEC 2013-C72 -- 2012 DA14
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2013-C72 & 2013-C74 -- 2012 DA14, 2002 LY1
821Cordoba Obs. Bosque Alegre Station in Argentina, 1 in MPEC 2013-C72 -- 2012 DA14
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 5 in MPECs 2013-C73, 2013-C74, 2013-C75, 2013-C76 & 2013-C77 -- 2013 CN118, 2013 CM118, 2013 CL118, 2013 CJ118, 2002 LY1
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2013-C72 -- 2012 DA14
J95Great Shefford Obs. in England, 2 in MPECs 2013-C74 & 2013-C77 -- 2013 CN118, 2002 LY1
711McDonald Obs. in Texas, 1 in MPEC 2013-C75 -- 2013 CL118
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-C77 -- 2013 CN118
E07Murrumbateman Obs. in New South Wales, 1 in MPEC 2013-C72 -- 2012 DA14
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2013-C73, 2013-C74, 2013-C75 & 2013-C76 -- 2013 CM118, 2013 CL118, 2013 CJ118, 2002 LY1
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2013-C72 -- 2012 DA14
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-C75 -- 2013 CL118
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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 CYJPL Sentry05012069-209153.5e-06-7.38-7.840JPL: "Analysis based on 69 observations spanning 11.951 days (2013-Feb-01.34874 to 2013-Feb-13.29949)." Diameter approximately 0.007 km. from mean, weighted H=28.3.
2012 DA14JPL Sentry1706R E M O V E DJPL: Risk listing removed at 1639 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 15 February '13

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

1925Updated Traffic Report
1749Grabbed MPEC 2013-C75 - 2013 CL118 - see above
Grabbed MPEC 2013-C76 - 2013 CM118 - see above
Grabbed MPEC 2013-C77 - 2013 CN118 - see above
1706Noted that JPL Sentry has removed 2012 DA14 as an impact risk - see above
Grabbed MPEC 2013-C72 - 2012 DA14 - see above
Grabbed MPEC 2013-C73 - 2013 CJ118 - see above
Grabbed MPEC 2013-C74 - 2002 LY1 - see above
0501Noted that JPL Sentry has updated its 2013 CY risk assessment - see above