Contents  on 10 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 10 April '13

One object reported inside ten LD

One object may be within ten lunar distances (LD) of Earth today. Risk-listed 2010 GM23 is calculated to come inside ten LD, traveling from 12.3 to 9.6 LD, but with an Earth passage uncertainty of 2.260 days.

Coming our way next, 2013 GH23 arrives inside ten LD on April 16th.

This report was generated at 1424 UTC with today's DOU MPEC reporting observation of intruder 2012 DA14 from February and 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. "LD*" indicates some passage uncertainty. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 10 April '13

The MPC's NEO Confirmation Page has 30 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 30 objects listed. Of these, 22 were "one nighters." So far The Tracking News has counted a total of 50 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 10 April '13

Minor Planet Electronic Circulars

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


MPEC 2013-G45 - "23:23 UT" - 2013 GW38


MPEC 2013-G44 - "23:20 UT" - 2013 GV38


MPEC 2013-G43 - "23:16 UT" - 2013 GU38


MPEC 2013-G42 - "23:12 UT" - 2013 GT38


MPEC 2013-G41 - "23:07 UT" - 2013 GS38


MPEC 2013-G40 - "22:29 UT" - 2013 GR38


MPEC 2013-G39 - "21:01 UT" - Comet C/2013 G2 (McNaught)


MPEC 2013-G38 - "17:28 UT" - 2013 GQ38


MPEC 2013-G37 - "16:11 UT" - 2010 LF14


MPEC 2013-G36 - "12:17 UT" - 2013 GJ35


<< DOU on 10 Apr. '13 >>  MPEC 2013-G35 - "06:03 UT" - Daily Orbit Update

Observers  on 10 April '13

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

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-G40 -- 2013 GR38
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2013-G35 -- 2013 EC28
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2013-G36, 2013-G38 & 2013-G43 -- 2013 GU38, 2013 GQ38, 2013 GJ35
I39Cruz del Sur Obs. in Argentina, 3 in MPECs 2013-G36, 2013-G39 & 2013-G40 -- 2013 GR38, 2013 GJ35, C/2013 G2
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPECs 2013-G42, 2013-G43 & 2013-G44 -- 2013 GV38, 2013 GU38, 2013 GT38
G32Elena Remote Obs., 1 in MPEC 2013-G40 -- 2013 GR38
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 2 in MPECs 2013-G39 & 2013-G45 -- 2013 GW38, C/2013 G2
168Kourovskaya Obs. in Russia, 1 in MPEC 2013-G35 -- 2012 DA14
W85LCOGT Cerro Tololo A in Chile, 2 in MPECs 2013-G39 & 2013-G40 -- 2013 GR38, C/2013 G2
W87LCOGT Cerro Tololo C in Chile, 2 in MPECs 2013-G36 & 2013-G43 -- 2013 GU38, 2013 GJ35
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2013-G44 & 2013-G45 -- 2013 GW38, 2013 GV38
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPECs 2013-G42 & 2013-G43 -- 2013 GU38, 2013 GT38
F51Pan-STARRS 1 (PS1) in Hawaii, 16 in MPECs 2013-G35, 2013-G37, 2013-G38, 2013-G40, 2013-G41, 2013-G42, 2013-G43, 2013-G44 & 2013-G45 -- 2013 GW38, 2013 GV38, 2013 GU38, 2013 GT38, 2013 GS38, 2013 GR38, 2013 GQ38, 2011 WU95, 2010 LF14, 2010 CR1, 350462, 333510, 277142, 141874, 8014, 1036
H23Pear Tree Obs. in Florida, 1 in MPEC 2013-G35 -- 2013 EV108
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2013-G35 -- 2013 FY13, 2013 EV89, 2013 EO126, 2009 UM3, 2005 TS15, 68216
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2013-G35 -- 2006 WQ1, 357058
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPECs 2013-G39 & 2013-G40 -- 2013 GR38, C/2013 G2
C48Sayn Solar Obs. in Russia, 1 in MPEC 2013-G35 -- 2013 GC34
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2013-G35, 2013-G36 & 2013-G39 -- 2013 GJ35, C/2013 G2, 2009 HF88
G401program code 1 via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPEC 2013-G35 -- 2013 EV108, 7888
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2013-G35, 2013-G37, 2013-G38, 2013-G41, 2013-G42, 2013-G43 & 2013-G44 -- 2013 GY7, 2013 GV38, 2013 GU38, 2013 GT38, 2013 GS38, 2013 GQ38, 2013 GM3, 2013 GL8, 2010 LF14
718Wiggins Obs. in Utah, 2 in MPEC 2013-G35 -- 2013 EV108, 2013 EO126
Q621program code 1 via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2013-G36 & 2013-G39 -- 2013 GJ35, C/2013 G2
Q622program code 2 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-G39 -- C/2013 G2
Q623program code 3 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-G39 -- C/2013 G2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 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 Sentry14192015-2106191.2e-08-2.48-2.550JPL: "Analysis based on 30 observations spanning 3.0599 days (2013-Apr-06.7433 to 2013-Apr-09.8032)." Diameter approximately 2.200 km. from mean, weighted H=15.9.
NEODyS14192015-2106331.58e-08-2.09-2.140NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2013-04-06.744 to 2013-04-09.804."
2013 GL8JPL Sentry1419208413.7e-09-5.05-5.050JPL: "Analysis based on 16 observations spanning 6.8895 days (2013-Apr-03.24377 to 2013-Apr-10.13324)." Diameter approximately 0.650 km. from mean, weighted H=18.6.
2013 GM3JPL Sentry14192027-21132271.4e-04-4.56-5.310JPL: "Analysis based on 39 observations spanning 6.8850 days (2013-Apr-03.32112 to 2013-Apr-10.20616)." Diameter approximately 0.020 km. from mean, weighted H=26.1.

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 10 April '13

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

2359Grabbed MPEC 2013-G45 - 2013 GW38 - see above
2322Grabbed MPEC 2013-G41 - 2013 GS38 - see above
Grabbed MPEC 2013-G42 - 2013 GT38 - see above
Grabbed MPEC 2013-G43 - 2013 GU38 - see above
Grabbed MPEC 2013-G44 - 2013 GV38 - see above
2238Grabbed MPEC 2013-G40 - 2013 GR38 - see above
2120Grabbed MPEC 2013-G39 - Comet C/2013 G2 (McNaught) - see above
1756Grabbed MPEC 2013-G37 - 2010 LF14 - see above
Grabbed MPEC 2013-G38 - 2013 GQ38 - see above
1424Generated Traffic Report
1419Noted that JPL Sentry has posted 2013 GJ35 as an impact risk - see above
Noted that NEODyS has posted 2013 GJ35 as an impact risk - see above
Noted that JPL Sentry has updated its 2013 GL8 risk assessment - see above
Noted that JPL Sentry has updated its 2013 GM3 risk assessment - see above
Grabbed MPEC 2013-G35 - Daily Orbit Update - see above
Grabbed MPEC 2013-G36 - 2013 GJ35 - see above