Contents  on 27 March '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 27 March '13

Five objects reported inside ten LD

Five visitors are reported to be within ten lunar distances (LD) of our planet today. Risk-listed 2013 EL89 is inbound from 7.49 to 6.03 LD and radar target 2013 FB8 from 7.71 to 6.31 LD. 2013 FD8 comes its closest to Earth this time around, reaching 8.44 LD at 1420 UT. 2013 FG is outbound from 6.69 to 8.48 LD and risk-listed 2013 FU13 leaves ten LD, moving from 9.7 to 11.0 LD*.

Coming toward Earth next, risk-listed 2010 GM23 arrives inside ten LD on April 10th.

This report was generated at 1421 UTC with follow-up in today's DOU MPEC for 2013 FB8 and observation of distant 68216 2001 CV26.

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. "LD*" indicates some passage uncertainty. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 27 March '13

The MPC's NEO Confirmation Page has 3 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three objects listed. Of these, one was a "one nighter."

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 27 March '13

Minor Planet Electronic Circulars

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

<< DOU on 27 Mar. '13 >>  MPEC 2013-F55 - "06:04 UT" - Daily Orbit Update

Observers  on 27 March '13

Eleven observers appear in today's MPEC.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-F55 -- 2013 FY13
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2013-F55 -- 2002 JW15
807~program code "~" (34) via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2013-F55 -- 2013 FB8, 277142
448Desert Moon Obs. in New Mexico, 5 in MPEC 2013-F55 -- 2013 FB8, 2013 EV108, 2009 SC15, 153249, 152952
E102Ernesto Guido in Italy via Faulkes Telescope South in New South Wales, 1 in MPEC 2013-F55 -- 2013 FY13
E89Geyserland Obs. in New Zealand, 1 in MPEC 2013-F55 -- 96315
711McDonald Obs. in Texas, 3 in MPEC 2013-F55 -- 2013 FX13, 2013 FW13, 2013 FB8
A24New Millennium Obs. in Italy, 8 in MPEC 2013-F55 -- 68216, 214869, 152952, 5828, 5645, 3752, 2329, 1864
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2013-F55 -- 2013 FC8, 2013 FB8, 2013 EV108, 2013 EA, 2001 TA2
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-F55 -- 8176
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2013-F55 -- 2009 BL2, 66008
I89iTelescope Obs. Nerpio in Spain, 1 in MPEC 2013-F55 -- 137199
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 March '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: JPL at 2359 UTC, NEODyS unavailable)
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 FW13JPL Sentry14202032-209849.0e-10-7.30-7.750JPL: "Analysis based on 28 observations spanning 3.0101 days (2013-Mar-23.47435 to 2013-Mar-26.48444)." Diameter approximately 0.160 km. from mean, weighted H=21.6.
2013 EH68NEODyS14202095-209513.73e-08-6.32-6.320NEODyS: "Based on 57 optical observations (of which 0 are rejected as outliers) from 2013-03-13.469 to 2013-03-22.346."

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 27 March '13

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

1421Generated Traffic Report
1420Noted that NEODyS has updated its 2013 EH68 risk assessment - see above
Noted that JPL Sentry has updated its 2013 FW13 risk assessment - see above
Grabbed MPEC 2013-F55 - Daily Orbit Update - see above