Contents  on 8 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 8 April '13

No objects reported inside ten LD

No objects are reported traveling within ten lunar distances (LD) of our planet today. Approaching next, risk-listed 2010 GM23 is calculated with major uncertainty to arrive inside ten LD on April 10th, and newly announced 2013 GH23 is preliminarily calculated to arrive on April 16th.

This report was updated at 2349 UTC with new discovery 2013 GH23 (MPEC). Today's first traffic report was generated at 1446 UTC with follow-up in today's DOU MPEC for departed objects 2013 FK, 2013 FD8, and 2013 FB8.

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 8 April '13

The MPC's NEO Confirmation Page has 26 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 26 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 43 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 8 April '13

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-G30 - "21:47 UT" - 2013 GH23

MPEC 2013-G29 - "21:44 UT" - 2013 GF23

MPEC 2013-G28 - "20:13 UT" - 2005 TS15

MPEC 2013-G27 - "18:56 UT" - 1996 TP6

MPEC 2013-G26 - "18:36 UT" - 2005 JO3

<< DOU on 8 Apr. '13 >>  MPEC 2013-G25 - "06:02 UT" - Daily Orbit Update

Observers  on 8 April '13

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-G29 -- 2013 GF23
703Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2013-G25 -- 206910, 163693, 4179
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 22 in MPECs 2013-G25, 2013-G27 & 2013-G29 -- 2013 GZ7, 2013 GY7, 2013 GN3, 2013 GJ, 2013 GH, 2013 GF23, 2013 FY13, 2013 FQ10, 2013 FK, 2013 EW108, 2013 EN126, 2013 CW35, 2012 UW68, 2012 TF53, 2010 OS22, 2009 FG1, 2007 TD71, 2006 HB, 2006 AO4, 2005 EJ94, 1996 TP6, 1991 FB
113Drebach Obs. in Germany, 1 in MPEC 2013-G29 -- 2013 GF23
006Fabra Obs. in Spain, 2 in MPEC 2013-G25 -- 11405, 4179
J95Great Shefford Obs. in England, 3 in MPECs 2013-G26, 2013-G27 & 2013-G28 -- 2005 TS15, 2005 JO3, 1996 TP6
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2013-G25 -- 359592
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2013-G30 -- 2013 GH23
844Los Molinos Obs. in Uruguay, 1 in MPEC 2013-G25 -- 4957
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2013-G26 -- 2005 JO3
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2013-G25 & 2013-G29 -- 2013 GF23, 2007 FD, 162063, 159923, 137078
675}program code "}" (33) via Mt. Palomar in southern California, 1 in MPEC 2013-G27 -- 1996 TP6
A13Naef Obs. in Switzerland, 1 in MPEC 2013-G25 -- 274855
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2013-G25 -- 2013 FA8
I41Palomar Transient Factory (PTF) in southern California, 2 in MPECs 2013-G26 & 2013-G27 -- 2005 JO3, 1996 TP6
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPECs 2013-G25 & 2013-G30 -- 2013 GH23, 2013 FZ7, 2013 DZ, 2012 LK9, 2008 HW1, 2002 JR9, 40267, 337075, 185853, 162900, 152964
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-G29 -- 2013 GF23
204Schiaparelli Obs. in Italy, 12 in MPEC 2013-G25 -- 2013 FZ7, 2013 FY7, 2013 FD8, 2013 FC8, 2013 FB8, 2013 ER41, 2013 EP89, 2013 EO126, 2013 EK89, 358744, 358453, 357028
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2013-G25 -- 2013 GJ, 2013 FY13, 2006 AO4
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2013-G25 -- 2012 RV16, 141531
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2013-G25 & 2013-G30 -- 2013 GM3, 2013 GH23, 2013 FZ7, 2012 XF55, 2009 SQ104
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2013-G25 -- 2013 EO126
718Wiggins Obs. in Utah, 2 in MPEC 2013-G25 -- 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 8 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
2013 GM3JPL Sentry14452026-20741519.0e-05-4.66-5.370JPL: "Analysis based on 34 observations spanning 3.9733 days (2013-Apr-03.32112 to 2013-Apr-07.29446)." Diameter approximately 0.021 km. from mean, weighted H=26.1.
NEODyS14452028-20901066.08e-05-4.91-5.690NEODyS: "Based on 34 optical observations (of which 2 are rejected as outliers) from 2013-04-03.322 to 2013-04-07.295."

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 8 April '13

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

2349Updated Traffic Report
2209Grabbed MPEC 2013-G29 - 2013 GF23 - see above
Grabbed MPEC 2013-G30 - 2013 GH23 - see above
2020Grabbed MPEC 2013-G28 - 2005 TS15 - see above
1909Grabbed MPEC 2013-G26 - 2005 JO3 - see above
Grabbed MPEC 2013-G27 - 1996 TP6 - see above
1445Noted that JPL Sentry has updated its 2013 GM3 risk assessment - see above
Noted that NEODyS has updated its 2013 GM3 risk assessment - see above
Grabbed MPEC 2013-G25 - Daily Orbit Update - see above