Contents  on 18 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 18 April '13

Three objects reported inside ten LD

Three objects are reported to be within ten lunar distances (LD) of Earth today. 2013 GH23 is inbound from 6.65 to 5.64 LD while 2013 GH66 is outbound from 4.21 to 4.39 LD and 2013 GJ69 from 8.70 to 9.65 LD.

No other objects are known to be coming inside ten LD until late July.

This report was updated at 2032 UTC with newly discovered and already departed 2013 HO (MPEC). Today's first traffic report was generated at 1504 UTC.



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 18 April '13

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of 30 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 18 April '13

Minor Planet Electronic Circulars

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


MPEC 2013-H20 - "17:11 UT" - 2013 HQ


MPEC 2013-H19 - "17:07 UT" - 2013 HR


MPEC 2013-H18 - "17:04 UT" - 2013 HO


MPEC 2013-H17 - "16:58 UT" - 2013 GH84


<< DOU on 18 Apr. '13 >>  MPEC 2013-H16 - "06:03 UT" - Daily Orbit Update

Observers  on 18 April '13

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
300Bisei Spaceguard Center in Japan, 3 in MPECs 2013-H16, 2013-H18 & 2013-H20 -- 2013 HQ, 2013 HO, 2013 GE84
493Calar Alto Obs. in Spain, 1 in MPEC 2013-H17 -- 2013 GH84
160Castelmartini Obs. in Italy, 4 in MPECs 2013-H16 & 2013-H18 -- 2013 HO, 2013 EO126, 2009 SC15, 214869
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2013-H16, 2013-H18 & 2013-H20 -- 2013 HQ, 2013 HO, 2013 EO126, 275974
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 22 in MPECs 2013-H16, 2013-H17 & 2013-H18 -- 2013 HO, 2013 GZ73, 2013 GX79, 2013 GU79, 2013 GU38, 2013 GS66, 2013 GQ38, 2013 GK69, 2013 GH84, 2013 GH69, 2013 GG69, 2013 GF69, 2013 GC55, 2013 FZ7, 2013 EW27, 2013 EW108, 2013 EV89, 2013 ER89, 2013 CW35, 2012 YN6, 2012 UW68, 2005 GO22
G58Chabot Obs. in northern California, 2 in MPECs 2013-H16 & 2013-H18 -- 2013 HO, 2013 GQ38
113Drebach Obs. in Germany, 2 in MPECs 2013-H18 & 2013-H20 -- 2013 HQ, 2013 HO
151Eschenberg Obs. in Switzerland, 2 in MPEC 2013-H16 -- 2013 FY13, 2002 GS
C73Galati Obs. in Romania, 1 in MPEC 2013-H18 -- 2013 HO
695]Mark Trueblood via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2013-H16 -- 2013 GM3
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2013-H16 -- 2013 GJ35
W87LCOGT Cerro Tololo C in Chile, 2 in MPECs 2013-H16 & 2013-H19 -- 2013 HR, 2013 GF84
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2013-H17 & 2013-H19 -- 2013 HR, 2013 GH84
711McDonald Obs. in Texas, 3 in MPECs 2013-H16 & 2013-H17 -- 2013 GV68, 2013 GH84, 2013 EK28
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-H20 -- 2013 HQ
A13Naef Obs. in Switzerland, 1 in MPEC 2013-H16 -- 2013 GV68
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-H16 -- 139289
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2013-H16, 2013-H17 & 2013-H19 -- 2013 HR, 2013 GV68, 2013 GH84, 2011 WU95, 2008 JP14, 210012, 143637, 141531, 136874
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2013-H18 & 2013-H20 -- 2013 HQ, 2013 HO
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2013-H16 -- 2013 GK69, 2013 GJ35
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2013-H16 & 2013-H17 -- 2013 GY7, 2013 GU66, 2013 GU38, 2013 GT38, 2013 GR38, 2013 GQ38, 2013 GH84, 2013 GH69, 2013 GG69, 2013 GD34, 2013 FZ7, 2005 JO3
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2013-H18 -- 2013 HO
I76Tesla Obs. in Spain, 1 in MPEC 2013-H16 -- 2013 FY13
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2013-H16 -- 2013 GR38, 2013 GK69, 2013 FY13
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 HRJPL Sentry19452033-2090103.7e-07-5.73-5.960JPL: "Analysis based on 12 observations spanning .99957 days (2013-Apr-16.50903 to 2013-Apr-17.5086)." Diameter approximately 0.061 km. from mean, weighted H=23.7.
NEODyS19452033-209084.94e-07-5.65-5.780NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2013-04-16.510 to 2013-04-17.509."
2013 GZ73JPL Sentry1501207712.3e-10-6.98-6.980JPL: "Analysis based on 36 observations spanning 5.7832 days (2013-Apr-11.4116 to 2013-Apr-17.19482)." Diameter approximately 0.510 km. from mean, weighted H=19.1.
2013 GG69NEODyS17252030-2094105.46e-08-3.88-4.070NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2013-04-10.432 to 2013-04-18.224."
JPL Sentry15012030-2111201.1e-07-3.65-3.920JPL: "Analysis based on 21 observations spanning 7.7923 days (2013-Apr-10.43133 to 2013-Apr-18.2236)." Diameter approximately 0.597 km. from mean, weighted H=18.8.
2013 GF69NEODyS17252030-2112341.76e-07-4.14-4.490NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2013-04-10.424 to 2013-04-17.251."
JPL Sentry15012030-2112551.2e-06-3.24-3.660JPL: "Analysis based on 15 observations spanning 6.8266 days (2013-Apr-10.42368 to 2013-Apr-17.25027)." Diameter approximately 0.410 km. from mean, weighted H=19.6.
2013 GM3NEODyS19452033-2090986.84e-05-4.95-5.740NEODyS: "Based on 53 optical observations (of which 2 are rejected as outliers) from 2013-04-03.322 to 2013-04-13.303."
JPL Sentry15012028-21131771.6e-04-4.57-5.250JPL: "Analysis based on 53 observations spanning 9.9806 days (2013-Apr-03.32112 to 2013-Apr-13.30177)." Diameter approximately 0.019 km. from mean, weighted H=26.3.

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 18 April '13

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

2032Updated Traffic Report
1945Noted that NEODyS has updated its 2013 GM3 risk assessment - see above
Noted that JPL Sentry has posted 2013 HR as an impact risk - see above
Noted that NEODyS has posted 2013 HR as an impact risk - see above
1725Noted that NEODyS has updated its 2013 GF69 risk assessment - see above
Noted that NEODyS has updated its 2013 GG69 risk assessment - see above
Grabbed MPEC 2013-H17 - 2013 GH84 - see above
Grabbed MPEC 2013-H18 - 2013 HO - see above
Grabbed MPEC 2013-H19 - 2013 HR - see above
Grabbed MPEC 2013-H20 - 2013 HQ - see above
1501Noted that JPL Sentry has updated its 2013 GF69 risk assessment - see above
Noted that JPL Sentry has updated its 2013 GG69 risk assessment - see above
Noted that JPL Sentry has updated its 2013 GM3 risk assessment - see above
Noted that JPL Sentry has updated its 2013 GZ73 risk assessment - see above
Grabbed MPEC 2013-H16 - Daily Orbit Update - see above