Contents  on 14 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 14 April '13

Four objects reported inside ten LD

There are four asteroids reported within ten lunar distances (LD) of our planet today. Risk-listed 2010 GM23 may be exiting Earth's Hill sphere, flying from perhaps 3.9 to 4.9 LD*. Further away, 2013 GH66 is inbound from 4.02 to 3.98 LD and 2013 GJ69 from 8.51 to 7.95 LD, while 2013 GT66 is outbound from 7.43 to 8.48 LD.

Next known to be approaching is 2013 GH23, which arrives inside ten LD on April 16th.

This report was generated at 1504 UTC with today's DOU MPEC having follow-up for 2013 GH23, first follow-up for departed 2013 GD55, and observation of distant 2003 FY6.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. 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 14 April '13

The MPC's NEO Confirmation Page has 33 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 33 objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of 35 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 14 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-G74 - "14:25 UT" - 2008 KZ5

MPEC 2013-G73 - "13:52 UT" - Comet C/2013 G3 (Panstarrs)

<< DOU on 14 Apr. '13 >>  MPEC 2013-G72 - "06:03 UT" - Daily Orbit Update

Observers  on 14 April '13

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
C77Bernezzo Obs. in Italy, 2 in MPEC 2013-G72 -- 2013 FY13, 89958
B88Bigmuskie Obs. in Italy, 1 in MPEC 2013-G72 -- 2013 GS66
703Catalina Sky Survey in Arizona, 1 in MPEC 2013-G72 -- 2009 SC15
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2013-G72 -- 2013 GS66, 2013 GR38, 2013 GC55
850Cordell-Lorenz Obs. in Tennessee, 3 in MPEC 2013-G72 -- 2013 GV68, 2013 FY13, 2013 EO126
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 5 in MPECs 2013-G72, 2013-G73 & 2013-G74 -- C/2013 G3, 2012 HW1, 2008 KZ5, 2008 GB110, 350462
K36Ebersheim Obs., 2 in MPEC 2013-G72 -- 6047, 5828
006Fabra Obs. in Spain, 2 in MPEC 2013-G72 -- 7888, 1036
F658David Tholen's team in Hawaii via Faulkes Telescope North in Hawaii, 1 in MPEC 2013-G72 -- 2013 GH23
E102Ernesto Guido in Italy via Faulkes Telescope South in New South Wales, 1 in MPEC 2013-G73 -- C/2013 G3
E89Geyserland Obs. in New Zealand, 3 in MPEC 2013-G72 -- 96189, 285263, 1036
844Los Molinos Obs. in Uruguay, 3 in MPEC 2013-G72 -- 96189, 285263, 1036
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2013-G73 -- C/2013 G3
711McDonald Obs. in Texas, 1 in MPEC 2013-G73 -- C/2013 G3
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2013-G72 -- 2013 FY13
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2013-G72 -- 2013 GD55, 164206
A13Naef Obs. in Switzerland, 1 in MPEC 2013-G72 -- 2013 EA
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2013-G72 & 2013-G73 -- 2013 GR66, C/2013 G3, 2012 HW1, 2010 KR10, 2006 HB, 1988 TA, 65803, 243298, 154589, 3757
A53Peschiera del Garda Obs. in Italy, 3 in MPEC 2013-G72 -- 2013 FY13, 2013 EV108, 2013 EO126
H36Sandlot Obs. in Kansas, 3 in MPEC 2013-G72 -- 2013 GX68, 2013 GE55, 2013 GD55
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2013-G72 -- 2013 GF
204Schiaparelli Obs. in Italy, 12 in MPECs 2013-G72 & 2013-G73 -- 2013 GR38, 2013 GF23, C/2013 G3, 2013 FZ7, 2013 FX13, 2013 EW27, 2013 ES89, 2013 ER89, 2012 QO10, 2011 GQ61, 2007 EP88, 2003 FY6
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2013-G72 -- 2006 HB, 1988 TA, 329437
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2013-G72 & 2013-G73 -- 2013 GM8, 2013 GM3, 2013 GE55, C/2013 G3, 2013 BH18, 2010 KR10
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2013-G73 -- C/2013 G3
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-G72 -- 161998
718Wiggins Obs. in Utah, 2 in MPEC 2013-G72 -- 2013 EV108, 2013 EO126
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 April '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2320 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 GE55JPL Sentry1501R E M O V E DJPL: Risk listing removed at 0955 UTC.
2013 GM3JPL Sentry15012028-21121701.5e-04-4.60-5.290JPL: "Analysis based on 50 observations spanning 9.9806 days (2013-Apr-03.32112 to 2013-Apr-13.30177)." Diameter approximately 0.019 km. from mean, weighted H=26.2.

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 14 April '13

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

1504Generated Traffic Report
1501Noted that JPL Sentry has removed 2013 GE55 as an impact risk - see above
Noted that JPL Sentry has updated its 2013 GM3 risk assessment - see above
Grabbed MPEC 2013-G72 - Daily Orbit Update - see above
Grabbed MPEC 2013-G73 - Comet C/2013 G3 (Panstarrs) - see above
Grabbed MPEC 2013-G74 - 2008 KZ5 - see above