Contents  on 12 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 12 April '13

Four objects reported inside ten LD

There are four visitors reported to be within ten lunar distances (LD) of our planet today. New discovery 2013 GH66 is inbound from 4.27 to 4.12 LD, risk-listed 2010 GM23 from 7.0 to 4.8 LD* (maybe), and newly announced 2013 GT66 from 7.56 to 7.09 LD, while 2013 GB55 comes its closest to Earth this time around, reaching 9.81 LD at 2012 UTC.

Coming towards us next, risk-listed 2013 GH23 arrives inside ten LD on April 16th.

This report was generated at 1856 UTC with new discoveries 2013 GT66 (MPEC) and 2013 GH66 (MPEC), which has been inside our ten-LD reporting "bubble" since March 27th and doesn't leave until May 4th.



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. "LD*" indicates some passage uncertainty. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 12 April '13

The MPC's NEO Confirmation Page has 39 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 39 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 56 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 12 April '13

Minor Planet Electronic Circulars

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


MPEC 2013-G60 - "17:25 UT" - 2013 GU66


MPEC 2013-G59 - "14:56 UT" - 2013 GS66


MPEC 2013-G58 - "14:34 UT" - 2013 GT66


MPEC 2013-G57 - "14:31 UT" - 2013 GR66


MPEC 2013-G56 - "13:27 UT" - 2013 GH66


MPEC 2013-G55 - "12:31 UT" - 2010 KR10


<< DOU on 12 Apr. '13 >>  MPEC 2013-G54 - "06:03 UT" - Daily Orbit Update

Observers  on 12 April '13

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 3 in MPECs 2013-G58, 2013-G59 & 2013-G60 -- 2013 GU66, 2013 GT66, 2013 GS66
300Bisei Spaceguard Center in Japan, 2 in MPECs 2013-G57 & 2013-G58 -- 2013 GT66, 2013 GR66
703Catalina Sky Survey (CSS) in Arizona, 15 in MPECs 2013-G54, 2013-G58 & 2013-G59 -- 2013 GT66, 2013 GS66, 2013 GC34, 2013 FY13, 2011 WU95, 2010 GA24, 68216, 357028, 354952, 350513, 274855, 161998, 8567, 5693, 1917
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPECs 2013-G54, 2013-G57, 2013-G59 & 2013-G60 -- 2013 GU66, 2013 GU38, 2013 GS66, 2013 GR66, 2013 GQ38, 2013 GJ35, 152941, 3988
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 7 in MPECs 2013-G54, 2013-G55, 2013-G56, 2013-G57 & 2013-G59 -- 2013 GS66, 2013 GS38, 2013 GR66, 2013 GH66, 2012 TF53, 2010 KR10, 1988 TA
G32Elena Remote Obs., 1 in MPEC 2013-G54 -- 2013 GR38
006Fabra Obs. in Spain, 1 in MPEC 2013-G54 -- 7888
E89Geyserland Obs. in New Zealand, 2 in MPEC 2013-G54 -- 285263, 1036
J95Great Shefford Obs. in England, 2 in MPECs 2013-G56 & 2013-G58 -- 2013 GT66, 2013 GH66
695]Mark Trueblood via Kitt Peak Natl. Obs. (KPNO) in Arizona, 15 in MPEC 2013-G54 -- 2013 FZ7, 2013 FY13, 2013 FX13, 2013 FW13, 2013 FT13, 2013 FL9, 2013 FA8, 2013 EV108, 2013 EQ4, 2013 EO126, 2013 EL28, 2013 EC68, 2013 EA, 2013 AE69, 163364
W85LCOGT Cerro Tololo A in Chile, 2 in MPECs 2013-G54 & 2013-G60 -- 2013 GU66, 2013 GJ35
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2013-G54 -- 2013 GS38
K38M57 Obs., 1 in MPEC 2013-G54 -- 350988
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-G60 -- 2013 GU66
711McDonald Obs. in Texas, 1 in MPEC 2013-G59 -- 2013 GS66
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2013-G54 & 2013-G56 -- 2013 GH66, 243298, 153220
I41Palomar Transient Factory (PTF) in southern California, 5 in MPEC 2013-G54 -- 99935, 54686, 343158, 163696, 11311
F51Pan-STARRS 1 (PS1) in Hawaii, 14 in MPECs 2013-G54, 2013-G56, 2013-G57 & 2013-G60 -- 2013 GU66, 2013 GR66, 2013 GH66, 2013 FY13, 2013 FA8, 2012 QC8, 275976, 27346, 216689, 164201, 139289, 11405, 1917, 1866
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2013-G54 -- 2013 EV108, 2012 XY6, 2011 SD173, 2009 UM3, 2009 SQ104
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPEC 2013-G54 -- 354952, 206910, 7480, 4179
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2013-G54 -- 2013 GR38
V05Rusty Mtn. Obs., 1 in MPEC 2013-G59 -- 2013 GS66
461SZTE Asteroid Program in Hungary, 1 in MPEC 2013-G59 -- 2013 GS66
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2013-G59 -- 2013 GS66
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-G56, 2013-G58 & 2013-G60 -- 2013 GU66, 2013 GT66, 2013 GH66
E12Siding Spring Survey in New South Wales, 1 in MPEC 2013-G54 -- 2013 GJ35
G401program code 1 via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-G54 -- 3752
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-G54 -- 141531
291Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2013-G54, 2013-G56 & 2013-G57 -- 2013 GZ7, 2013 GY7, 2013 GV38, 2013 GS38, 2013 GR66, 2013 GR38, 2013 GO3, 2013 GL8, 2013 GH66, 2013 FW13, 2013 FQ10, 2013 FA8, 2013 EO126, 2013 EH89
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2013-G59 -- 2013 GS66
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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 GA55NEODyS14282070-2110201.03e-05-6.55-7.250NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2013-04-09.446 to 2013-04-11.173."
2013 GS38JPL Sentry1428R E M O V E DJPL: Risk listing removed at 0951 UTC.
2013 GJ35NEODyS14282015-2110301.18e-08-2.08-2.110NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2013-04-06.744 to 2013-04-11.672."
2013 GL8JPL Sentry1428208415.1e-09-4.90-4.900JPL: "Analysis based on 19 observations spanning 8.8959 days (2013-Apr-03.24377 to 2013-Apr-12.13964)." Diameter approximately 0.660 km. from mean, weighted H=18.6.

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 12 April '13

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

1856Generated Traffic Report
1812Grabbed MPEC 2013-G60 - 2013 GU66 - see above
1500Grabbed MPEC 2013-G57 - 2013 GR66 - see above
Grabbed MPEC 2013-G58 - 2013 GT66 - see above
Grabbed MPEC 2013-G59 - 2013 GS66 - see above
1428Noted that NEODyS has posted 2013 GA55 as an impact risk - see above
Noted that NEODyS has updated its 2013 GJ35 risk assessment - see above
Noted that JPL Sentry has updated its 2013 GL8 risk assessment - see above
Noted that JPL Sentry has removed 2013 GS38 as an impact risk - see above
Grabbed MPEC 2013-G54 - Daily Orbit Update - see above
Grabbed MPEC 2013-G55 - 2010 KR10 - see above
Grabbed MPEC 2013-G56 - 2013 GH66 - see above