Contents  on 13 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 13 April '13

Five objects reported inside ten LD

Five objects are reported to be within ten lunar distances (LD) of our home planet today. Within Earth's Hill sphere, unrecovered risk-listed 2010 GM23 may be coming its closest to the planet this time around, reaching perhaps 3.9 LD around 2259 UT (uncertainty: +/- 2.260 days). Out further, 2013 GH66 is inbound from 4.12 to 4.02 LD and newly announced 2013 GJ69 from 9.40 to 8.51 LD, while 2013 GT66 comes its closest to Earth on this passage, reaching 7.09 LD at 0153 UT, and 2013 GB55 leaves ten LD, traveling from 9.82 to 10.04 LD.

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

This report was generated at 1651 UTC with new discovery 2013 GJ69 (MPEC) and in today's DOU MPEC the first follow-up for 2013 GH23.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. 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 13 April '13

The MPC's NEO Confirmation Page has 28 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 28 objects listed. Of these, sixteen were "one nighters." So far The Tracking News has counted a total of 53 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 13 April '13

Minor Planet Electronic Circulars

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

MPEC 2013-G71 - "13:57 UT" - 2013 GK69

MPEC 2013-G70 - "13:54 UT" - 2013 GJ69

MPEC 2013-G69 - "13:50 UT" - 2013 GH69

MPEC 2013-G68 - "13:46 UT" - 2013 GG69

MPEC 2013-G67 - "13:42 UT" - 2013 GF69

<< DOU on 13 Apr. '13 >>  MPEC 2013-G66 - "06:03 UT" - Daily Orbit Update

MPEC 2013-G65 - "02:16 UT" - 2013 GY68

MPEC 2013-G64 - "02:13 UT" - 2013 GX68

MPEC 2013-G63 - "02:09 UT" - 2013 GW68

MPEC 2013-G62 - "02:05 UT" - 2013 GV68

MPEC 2013-G61 - "02:01 UT" - 2013 GU68

Observers  on 13 April '13

A total of 35 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 2 in MPECs 2013-G62 & 2013-G71 -- 2013 GV68, 2013 GK69
C77Bernezzo Obs. in Italy, 1 in MPEC 2013-G62 -- 2013 GV68
B88Bigmuskie Obs. in Italy, 1 in MPEC 2013-G66 -- 99942
300Bisei Spaceguard Center in Japan, 1 in MPEC 2013-G65 -- 2013 GY68
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2013-G63, 2013-G65 & 2013-G66 -- 2013 GY68, 2013 GW68, 2013 EV108, 2002 GS
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPECs 2013-G66 & 2013-G71 -- 2013 GX68, 2013 GU38, 2013 GR38, 2013 GQ38, 2013 GK69, 2013 GC55, 2013 ES89
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2013-G66 -- 2013 EO126
I39Cruz del Sur Obs. in Argentina, 2 in MPECs 2013-G62 & 2013-G71 -- 2013 GV68, 2013 GK69
958Dax Obs. in France, 1 in MPEC 2013-G66 -- 2013 GV68
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 6 in MPECs 2013-G61, 2013-G62, 2013-G63, 2013-G64, 2013-G65 & 2013-G69 -- 2013 GY68, 2013 GX68, 2013 GW68, 2013 GV68, 2013 GU68, 2013 GH69
006Fabra Obs. in Spain, 1 in MPEC 2013-G66 -- 7888
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2013-G65 -- 2013 GY68
F658David Tholen's team in Hawaii via Faulkes Telescope North in Hawaii, 1 in MPEC 2013-G66 -- 99942
J95Great Shefford Obs. in England, 1 in MPEC 2013-G70 -- 2013 GJ69
C43Hoyerswerda Obs. in Germany, 2 in MPECs 2013-G63 & 2013-G70 -- 2013 GW68, 2013 GJ69
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2013-G62 -- 2013 GV68
695]Mark Trueblood via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2013-G66 -- 2013 EK28
W85LCOGT Cerro Tololo A in Chile, 3 in MPECs 2013-G61, 2013-G67 & 2013-G68 -- 2013 GU68, 2013 GG69, 2013 GF69
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-G66 -- 2013 GH23
711McDonald Obs. in Texas, 2 in MPECs 2013-G67 & 2013-G68 -- 2013 GG69, 2013 GF69
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2013-G63, 2013-G64, 2013-G66, 2013-G69 & 2013-G70 -- 2013 GX68, 2013 GW68, 2013 GJ69, 2013 GH69, 356285
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-G66 -- 2007 CN26
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2013-G61, 2013-G66, 2013-G67, 2013-G68 & 2013-G69 -- 2013 GU68, 2013 GH69, 2013 GG69, 2013 GF69, 2010 LF14, 163001
A53Peschiera del Garda Obs. in Italy, 2 in MPEC 2013-G66 -- 2013 EV108, 2013 EO126
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2013-G66 -- 2013 EV108, 2012 XY6, 2011 SD173, 2009 UM3, 2009 SQ104
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2013-G66 -- 68278, 5693
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2013-G63 -- 2013 GW68
233San Vito Obs. in Italy, 3 in MPEC 2013-G66 -- 2009 UM3, 3752, 1036
H36Sandlot Obs. in Kansas, 6 in MPECs 2013-G62, 2013-G63, 2013-G64, 2013-G65, 2013-G66 & 2013-G70 -- 2013 GY68, 2013 GX68, 2013 GW68, 2013 GV68, 2013 GJ69, 2013 GF23
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2013-G71 -- 2013 GK69
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPECs 2013-G66 & 2013-G71 -- 2013 GK69, 2013 GJ35, 2013 GJ, 2012 QO10
G401program code 1 via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-G66 -- 274855
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-G62 -- 2013 GV68
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2013-G62, 2013-G66 & 2013-G68 -- 2013 GV68, 2013 GS38, 2013 GM3, 2013 GL8, 2013 GG69, 2013 BF18
926Tenagra II Obs. in Arizona, 3 in MPEC 2013-G66 -- 2007 TY18, 68063, 354952
718Wiggins Obs. in Utah, 2 in MPEC 2013-G66 -- 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 13 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 GG69JPL Sentry16112021-2111521.1e-07-3.76-4.460JPL: "Analysis based on 15 observations spanning 2.9415 days (2013-Apr-10.43133 to 2013-Apr-13.3728)." Diameter approximately 0.544 km. from mean, weighted H=19.0.
2013 GF69JPL Sentry16112016-21121146.9e-07-3.03-3.180JPL: "Analysis based on 10 observations spanning 2.9367 days (2013-Apr-10.42368 to 2013-Apr-13.36041)." Diameter approximately 0.401 km. from mean, weighted H=19.6.
2013 GL8JPL Sentry1523R E M O V E DJPL: Risk listing removed at 0954 UTC.
2013 GM3JPL Sentry15232028-21121941.5e-04-4.62-5.400JPL: "Analysis based on 47 observations spanning 8.8958 days (2013-Apr-03.32112 to 2013-Apr-12.21697)." Diameter approximately 0.019 km. from mean, weighted H=26.2.

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 13 April '13

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

1651Generated Traffic Report
1611Noted that JPL Sentry has posted 2013 GF69 as an impact risk - see above
Noted that JPL Sentry has posted 2013 GG69 as an impact risk - see above
1523Noted that JPL Sentry has removed 2013 GL8 as an impact risk - see above
Noted that JPL Sentry has updated its 2013 GM3 risk assessment - see above
Grabbed MPEC 2013-G66 - Daily Orbit Update - see above
Grabbed MPEC 2013-G67 - 2013 GF69 - see above
Grabbed MPEC 2013-G68 - 2013 GG69 - see above
Grabbed MPEC 2013-G69 - 2013 GH69 - see above
Grabbed MPEC 2013-G70 - 2013 GJ69 - see above
Grabbed MPEC 2013-G71 - 2013 GK69 - see above
0333Grabbed MPEC 2013-G61 - 2013 GU68 - see above
Grabbed MPEC 2013-G62 - 2013 GV68 - see above
Grabbed MPEC 2013-G63 - 2013 GW68 - see above
Grabbed MPEC 2013-G64 - 2013 GX68 - see above
Grabbed MPEC 2013-G65 - 2013 GY68 - see above