Contents  on 1 May '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 May '13

One object reported inside ten LD

One object is reported to be inside a radius of ten lunar distances (LD) from Earth today. 2013 GH66 is heading out from 8.44 to 8.84 LD. No other objects are known to come within that radius until late July.

This report was generated at 1523 UTC with observation of distant 68216 2001 CV26 in today's DOU MPEC.

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 1 May '13

The MPC's NEO Confirmation Page has 4 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of twelve 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 1 May '13

Minor Planet Electronic Circulars

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

MPEC 2013-J04 - "16:49 UT" - 2013 HJ19

MPEC 2013-J03 - "16:46 UT" - 2013 HH19

MPEC 2013-J02 - "16:42 UT" - 2013 HG19

<< DOU on 1 May '13 >>  MPEC 2013-J01 - "06:02 UT" - Daily Orbit Update

Observers  on 1 May '13

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2013-J01 & 2013-J02 -- 2013 HN11, 2013 HG19, 2013 GZ79, 2013 GQ38, 2013 GF, 2012 XY6
160Castelmartini Obs. in Italy, 1 in MPEC 2013-J01 -- 2013 GA80
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2013-J01 & 2013-J04 -- 2013 HJ19, 2012 TF53, 2011 WU95, 2010 GY6, 99942, 68216, 354952, 214869, 210012, 152952, 141531, 11284, 1917
448Desert Moon Obs. in New Mexico, 6 in MPEC 2013-J01 -- 2013 HO11, 2013 GY68, 2013 GU79, 2012 TF53, 2012 QO10, 108519
J95Great Shefford Obs. in England, 4 in MPECs 2013-J01, 2013-J02, 2013-J03 & 2013-J04 -- 2013 HJ19, 2013 HH19, 2013 HG19, 2013 GK69
J37Huelva Obs. in Spain, 1 in MPEC 2013-J01 -- 360191
K91MPC code K91, 1 in MPEC 2013-J02 -- 2013 HG19
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2013-J02, 2013-J03 & 2013-J04 -- 2013 HJ19, 2013 HH19, 2013 HG19
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-J01 -- 2005 PY16
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2013-J01, 2013-J02, 2013-J03 & 2013-J04 -- 2013 HJ19, 2013 HH19, 2013 HG19, 2012 QC8, 2011 WU95, 2006 HB
C39Nijmegen Obs., 6 in MPEC 2013-J01 -- 2013 FY13, 2009 BL2, 8176, 7888, 4034, 1866
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2013-J01 -- 351545, 175706, 140039, 137126
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2013-J01 -- 6050
H36Sandlot Obs. in Kansas, 2 in MPECs 2013-J03 & 2013-J04 -- 2013 HJ19, 2013 HH19
E12Siding Spring Survey (SSS) in New South Wales, 5 in MPECs 2013-J01, 2013-J02, 2013-J03 & 2013-J04 -- 2013 HT15, 2013 HJ19, 2013 HH19, 2013 HG19, 2007 YX1
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-J01 -- 7977
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2013-J01 -- 2013 HS11, 2013 HR11, 2013 GZ73, 2013 GY73, 2013 GU79, 2004 BG121
718Wiggins Obs. in Utah, 1 in MPEC 2013-J01 -- 2013 GR38
I15Wishing Star Obs. in Rhode Island, 5 in MPEC 2013-J01 -- 2013 HP11, 2013 HO11, 2013 GR38, 2013 FY13, 137170
Q621program code 1 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-J03 -- 2013 HH19
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 May '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
99942 Apophis (2004 MN4)JPL Sentry19162060-2105125.7e-06-3.19-3.320JPL: "Analysis based on 13 radar delay, 7 Doppler, and 3987 optical observations spanning 3318.0 days (2004-Mar-15.126289 to 2013-Apr-15.15729)." Diameter approximately 0.330 km. from mean, weighted H=19.7.
NEODyS19162060-2105125.71e-06-3.19-3.320NEODyS: "Based on 3987 optical observations (of which 0 are rejected as outliers) from 2004-03-15.126 to 2013-04-15.157 and also on twenty radar data points on 2005-01-27, 2005-01-29, 2005-01-30, 2005-08-07, 2006-05-06, 2012-12-21, 2012-12-22, 2013-01-03, 2013-01-05, 2013-01-06, 2013-01-09, 2013-01-10, 2013-01-14, 2013-01-16, 2013-02-18, 2013-02-20 and 2013-03-15."

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 May '13

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

1916Noted that JPL Sentry has updated its 99942 Apophis (2004 MN4) risk assessment - see above
Noted that NEODyS has updated its 99942 Apophis (2004 MN4) risk assessment - see above
1725Grabbed MPEC 2013-J02 - 2013 HG19 - see above
Grabbed MPEC 2013-J03 - 2013 HH19 - see above
Grabbed MPEC 2013-J04 - 2013 HJ19 - see above
1523Generated Traffic Report
1516Grabbed MPEC 2013-J01 - Daily Orbit Update - see above