Contents  on 6 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 6 April '13

No objects reported inside ten LD

There are no asteroids reported passing inside ten lunar distances (LD) of our planet today. Next up, risk-listed 2010 GM23 is calculated with major uncertainty to arrive within ten LD on April 10th.

This report was generated at 1546 UTC with observation in today's DOU MPEC 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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 6 April '13

The MPC's NEO Confirmation Page has 34 listings

When last checked at 2315 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 34 objects listed. Of these, 29 were "one nighters." So far The Tracking News has counted a total of 44 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 6 April '13

Minor Planet Electronic Circulars

As of last check at 2315 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-G21 - "15:34 UT" - 2013 GZ7

MPEC 2013-G20 - "15:31 UT" - 2013 GY7

<< DOU on 6 Apr. '13 >>  MPEC 2013-G19 - "06:02 UT" - Daily Orbit Update

Observers  on 6 April '13

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-G19 -- 2013 GN3
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2013-G19 & 2013-G21 -- 2013 GZ7, 2013 EW27, 2013 CN128
C77Bernezzo Obs. in Italy, 3 in MPEC 2013-G19 -- 2013 EV108, 2013 EO126, 5645
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPECs 2013-G19, 2013-G20 & 2013-G21 -- 2013 GZ7, 2013 GY7, 2013 GH, 2013 FD11, 2013 FC8, 2013 EZ108, 2013 EU9, 2013 BQ45, 2012 TV78, 2011 UW158, 2006 YF
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2013-G19 -- 2013 EO126
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2013-G19 -- 2013 GJ
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2013-G19 -- 2013 GF, 2013 FZ7
F65$Ernesto Guido in Italy via Faulkes Telescope North in Hawaii, 1 in MPEC 2013-G19 -- 2013 GN3
F658David Tholen's team in Hawaii via Faulkes Telescope North in Hawaii, 3 in MPEC 2013-G19 -- 2013 FD11, 2013 ER89, 99942
E102Ernesto Guido in Italy via Faulkes Telescope South in New South Wales, 1 in MPEC 2013-G20 -- 2013 GY7
J95Great Shefford Obs. in England, 2 in MPECs 2013-G19 & 2013-G20 -- 2013 GY7, 2013 GM3
D00ISON-Kislovodsk Obs., 1 in MPEC 2013-G19 -- 54686
W87LCOGT Cerro Tololo C in Chile, 2 in MPECs 2013-G19 & 2013-G20 -- 2013 GY7, 2013 GO3
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2013-G21 -- 2013 GZ7
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-G20 -- 2013 GY7
J93Mt. Tuffley Obs. in England, 3 in MPEC 2013-G19 -- 68216, 5645, 1036
I41Palomar Transient Factory (PTF) in southern California, 6 in MPECs 2013-G19 & 2013-G20 -- 2013 GY7, 2013 FQ10, 2013 EO126, 2010 RM42, 2009 SC15, 2002 GS
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2013-G19, 2013-G20 & 2013-G21 -- 2013 GZ7, 2013 GY7, 2012 RV16, 2012 QC8, 52340, 137199, 6050
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-G20 -- 2013 GY7
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2013-G19 -- 2013 GJ, 2013 FY13
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-G19 -- 2006 HB
I42Westport Obs. in Massachusetts, 2 in MPEC 2013-G19 -- 2013 EV108, 2013 EO126
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2013-G19 -- 2013 EO126, 2013 EA, 2009 UM3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 April '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2315 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 GM3JPL Sentry17002026-21136192.8e-03-2.60-2.600JPL #2 for the day: "Analysis based on 27 observations spanning 2.6253 days (2013-Apr-03.32112 to 2013-Apr-05.94644)." Diameter approximately 0.021 km. from mean, weighted H=26.0.
NEODyS15442026-20901341.65e-04-4.01-4.10NEODyS: "Based on 27 optical observations (of which 1 are rejected as outliers) from 2013-04-03.322 to 2013-04-05.947."
2013 EC20NEODyS15442077-210051.96e-06-8.04-8.170NEODyS: "Based on 59 optical observations (of which 0 are rejected as outliers) from 2013-03-07.217 to 2013-03-13.563."

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 6 April '13

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

1700Noted that JPL Sentry has updated its 2013 GM3 risk assessment - see above
1546Generated Traffic Report
1544Noted that NEODyS has updated its 2013 EC20 risk assessment - see above
Noted that NEODyS has posted 2013 GM3 as an impact risk - see above
Grabbed MPEC 2013-G19 - Daily Orbit Update - see above
Grabbed MPEC 2013-G20 - 2013 GY7 - see above
Grabbed MPEC 2013-G21 - 2013 GZ7 - see above
0037Noted that JPL Sentry has posted 2013 GM3 as an impact risk - see above