Contents  on 17 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 17 April '13

Four objects reported inside ten LD

There are four asteroids reported to be within ten lunar distances (LD) of our planet today. 2013 GH23 is inbound from 8.25 to 6.65 LD, 2013 GH66 is outbound from 4.08 to 4.21 LD and 2013 GJ69 from 8.05 to 8.70 LD, while risk-listed 2010 GM23 may be leaving ten LD without having been detected on this passage.

No other objects are known to be coming this close until late July.

This report was generated at 1407 UTC with today's DOU MPEC carrying the first follow-up for departed risk-listed 2013 FU13, adding 16.310 days to its 0.909-day discovery arc.



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 17 April '13

The MPC's NEO Confirmation Page has 22 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 22 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 26 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 17 April '13

Minor Planet Electronic Circulars

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


MPEC 2013-H15 - "20:42 UT" - 2013 GF84


MPEC 2013-H14 - "20:37 UT" - 2013 HA


MPEC 2013-H13 - "18:24 UT" - 2013 GE84


MPEC 2013-H12 - "15:08 UT" - 2012 OP


<< DOU on 17 Apr. '13 >>  MPEC 2013-H11 - "06:03 UT" - Daily Orbit Update

Observers  on 17 April '13

A total of 29 observers appear in today's MPECs.

CodeObserver / observatory
493Calar Alto Obs. in Spain, 1 in MPEC 2013-H13 -- 2013 GE84
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2013-H11 & 2013-H14 -- 2013 HA, 2013 FY13, 2013 EL28, 2009 UM3, 137175, 4034, 1981
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2013-H13 -- 2013 GE84
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2013-H11 -- 2013 FD11
113Drebach Obs. in Germany, 1 in MPEC 2013-H13 -- 2013 GE84
006Fabra Obs. in Spain, 2 in MPEC 2013-H11 -- 7888, 1036
157Frasso Sabino Obs. in Italy, 2 in MPEC 2013-H11 -- 2008 ED69, 2003 EO16
C73Galati Obs. in Romania, 3 in MPECs 2013-H11, 2013-H13 & 2013-H14 -- 2013 HA, 2013 GE84, 2013 GA80
J95Great Shefford Obs. in England, 1 in MPEC 2013-H13 -- 2013 GE84
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2013-H13 -- 2013 GE84
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2013-H11 -- 2013 GJ35
5682David Tholen's team on Mauna Kea in Hawaii, 3 in MPECs 2013-H11 & 2013-H15 -- 2013 GJ35, 2013 GF84, 2013 FU13
711McDonald Obs. in Texas, 5 in MPECs 2013-H11 & 2013-H13 -- 2013 GY7, 2013 GS66, 2013 GE84, 2013 EY27, 2012 XF112
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2013-H13 -- 2013 GE84
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2013-H11 & 2013-H14 -- 2013 HA, 2013 FQ10, 358453, 154347, 152889, 141495
A24New Millennium Obs. in Italy, 1 in MPEC 2013-H13 -- 2013 GE84
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2013-H11 & 2013-H13 -- 2013 GE84, 137911, 4015
D03Rantiga Obs., 1 in MPEC 2013-H14 -- 2013 HA
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2013-H13 -- 2013 GE84
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2013-H11 -- 2013 GV79
204Schiaparelli Obs. in Italy, 2 in MPECs 2013-H12 & 2013-H13 -- 2013 GE84, 2012 OP
E12Siding Spring Survey in New South Wales, 1 in MPEC 2013-H11 -- 2013 GK69
J84South Obs. in England, 1 in MPEC 2013-H11 -- 2013 GV79
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2013-H11 -- 2011 WU95, 354952
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2013-H13 -- 2013 GE84
G56Walnut Creek Obs. in northern California, 3 in MPECs 2013-H11, 2013-H13 & 2013-H14 -- 2013 HA, 2013 GE84, 2001 GQ2
C75Whitestar Obs., 1 in MPEC 2013-H11 -- 3752
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 2 in MPECs 2013-H12 & 2013-H14 -- 2013 HA, 2012 OP
Q621program code 1 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-H12 -- 2012 OP
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2013 GJ35JPL Sentry1404R E M O V E DJPL: Risk listing removed at 0950 UTC.
NEODyS1404R E M O V E D-
2013 FU13JPL Sentry14042072-2112111.4e-04-5.23-5.320JPL: "Analysis based on 21 observations spanning 17.219 days (2013-Mar-24.34961 to 2013-Apr-10.568711)." Diameter approximately 0.012 km. from mean, weighted H=27.2.
NEODyS14042081-210671.89e-04-5.08-5.090NEODyS: "Based on 21 optical observations (of which 1 are rejected as outliers) from 2013-03-24.350 to 2013-04-10.569."

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 17 April '13

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

2129Grabbed MPEC 2013-H14 - 2013 HA - see above
Grabbed MPEC 2013-H15 - 2013 GF84 - see above
1909Grabbed MPEC 2013-H13 - 2013 GE84 - see above
1511Grabbed MPEC 2013-H12 - 2012 OP - see above
1407Generated Traffic Report
1404Noted that JPL Sentry has updated its 2013 FU13 risk assessment - see above
Noted that NEODyS has updated its 2013 FU13 risk assessment - see above
Noted that JPL Sentry has removed 2013 GJ35 as an impact risk - see above
Noted that NEODyS has removed 2013 GJ35 as an impact risk - see above
Grabbed MPEC 2013-H11 - Daily Orbit Update - see above