Contents  on 1 April '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 April '13

Two objects reported inside ten LD

There are two asteroids reported to be within ten lunar distances (LD) of Earth today. Radar target 2013 FB8 is outbound from 4.83 to 5.89 LD and risk-listed 2013 EL89 from 6.16 to 7.64 LD. On approach next, risk-listed 2010 GM23 arrives inside ten LD on April 10th.

This report was generated at 1403 UTC.

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.

Radar Astrometry  on 1 April '13

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 2238 UTC when the database was dated 1 April

NEOCP Activity  on 1 April '13

The MPC's NEO Confirmation Page has 7 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven objects listed. Of these, three were "one nighters." So far The Tracking News has counted a total of nine listings on the NEOCP today.

New MPECs  on 1 April '13

Minor Planet Electronic Circulars

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

MPEC 2013-G03 - "23:45 UT" - 2006 GX2

MPEC 2013-G02 - "15:37 UT" - Comet C/2013 F3 (McNaught)

<< DOU on 1 Apr. '13 >>  MPEC 2013-G01 - "06:02 UT" - Daily Orbit Update

Observers  on 1 April '13

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 7 in MPEC 2013-G01 -- 2013 ET9, 2009 SN98, 1999 GR6, 276732, 8176, 7358, 6047
924Cegep de Trois-Rivieres Obs. in Quebec, 1 in MPEC 2013-G01 -- 99942
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPEC 2013-G01 -- 2013 FY13, 2013 FQ10, 2013 EW27, 2013 EJ89, 2013 CL89, 2013 AU27, 2002 XZ38
I48El Catalejo Obs. in Argentina, 1 in MPEC 2013-G02 -- C/2013 F3
203GiaGa Obs. in Italy, 1 in MPEC 2013-G01 -- 2009 SC15
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2013 FB8
J95Great Shefford Obs. in England, 1 in MPEC 2013-G03 -- 2006 GX2
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2013-G01 & 2013-G02 -- C/2013 F3, 2013 EV89, 2009 HU2, 216689, 719
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-G01 -- 2013 EM89
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2013-G01 & 2013-G02 -- 2013 FY13, C/2013 F3, 2012 MR4
J84South Obs. in England, 1 in MPEC 2013-G01 -- 2008 SE85
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2013-G01 -- 2013 FZ7, 2013 FX13, 2013 FQ10, 2013 FA8, 2013 ER89, 2013 EH89, 2009 JR5
I42Westport Obs. in Massachusetts, 2 in MPEC 2013-G01 -- 2013 EV108, 2013 ET9
718Wiggins Obs. in Utah, 2 in MPEC 2013-G01 -- 2013 EV108, 2013 EO126
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-G02 -- C/2013 F3
Q62"program code '"' (11) via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-G02 -- C/2013 F3
Q621program code 1 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-G02 -- C/2013 F3
Q622program code 2 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-G02 -- C/2013 F3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 April '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
2008 UV99JPL Sentry04112019-2110319.8e-08-3.86-4.080JPL: "Analysis based on 22 observations spanning .90541 days (2008-Oct-31.11917 to 2008-Nov-01.02458)." Diameter approximately 0.400 km. from mean, weighted H=19.6.

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 April '13

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

2359Grabbed MPEC 2013-G03 - 2006 GX2 - see above
2238Noted Radar Astrometry database update - see above
1834Grabbed MPEC 2013-G02 - Comet C/2013 F3 (McNaught) - see above
1403Generated Traffic Report
1359Grabbed MPEC 2013-G01 - Daily Orbit Update - see above
0411Noted that JPL Sentry has updated its 2008 UV99 risk assessment - see above