Contents  on 16 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 16 April '13

Four objects reported inside ten LD

There are four objects reported inside ten lunar distances (LD) of Earth today. 2013 GH66 is slowly outbound from 4.01 to 4.08 LD, unobserved risk-listed 2010 GM23 may be headed away from 7.2 to 9.8 LD*, and 2013 GJ69 is departing, passing from 7.79 to 8.05 LD, while 2013 GH23 comes inside ten LD, moving from 10.16 to 8.25 LD.

No other objects are known to be coming this close until late July.

This report was generated at 1406 UTC with first follow-up in today's DOU MPEC for potential mission target 2013 GH66 plus continuing observations of 2013 GD55 and 2013 GH23.



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 16 April '13

The MPC's NEO Confirmation Page has 25 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 25 objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of 42 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 16 April '13

Minor Planet Electronic Circulars

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


MPEC 2013-H10 - "21:33 UT" - Comet C/2013 G7 (McNaught)


MPEC 2013-H09 - "20:35 UT" - 2013 GZ79


MPEC 2013-H08 - "20:29 UT" - 2013 GA80


MPEC 2013-H07 - "18:57 UT" - Comet C/2013 G6 (Lemmon)


MPEC 2013-H06 - "17:36 UT" - Comet C/2013 G5 (Catalina)


MPEC 2013-H05 - "16:18 UT" - Comet P/2013 G4 (Panstarrs)


<< DOU on 16 Apr. '13 >>  MPEC 2013-H04 - "06:03 UT" - Daily Orbit Update


MPEC 2013-H03 - "02:27 UT" - 2008 TF4


MPEC 2013-H02 - "02:23 UT" - 2008 HO3


MPEC 2013-H01 - "02:20 UT" - 2012 JG11

Observers  on 16 April '13

A total of 44 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 2 in MPECs 2013-H07 & 2013-H10 -- C/2013 G7, C/2013 G6
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2013-H04 -- 2013 GY7, 2013 GU38, 2013 GS66, 2013 GR38, 2013 GQ38, 2013 FC11
A81Balzaretto Obs. in Italy, 2 in MPEC 2013-H04 -- 2013 EV108, 2013 EO126
C77Bernezzo Obs. in Italy, 1 in MPEC 2013-H08 -- 2013 GA80
B88Bigmuskie Obs. in Italy, 1 in MPEC 2013-H04 -- 2013 GS66
300Bisei Spaceguard Center in Japan, 1 in MPEC 2013-H06 -- C/2013 G5
493Calar Alto Obs. in Spain, 5 in MPECs 2013-H01, 2013-H02, 2013-H03, 2013-H06 & 2013-H08 -- 2013 GA80, C/2013 G5, 2012 JG11, 2008 TF4, 2008 HO3
703Catalina Sky Survey (CSS) in Arizona, 9 in MPECs 2013-H04, 2013-H06, 2013-H08 & 2013-H09 -- 2013 GZ79, 2013 GA80, C/2013 G5, 2008 SE85, 99942, 274855, 27346, 143637, 1866
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2013-H05, 2013-H07, 2013-H08, 2013-H09 & 2013-H10 -- 2013 GZ79, 2013 GA80, C/2013 G7, C/2013 G6, P/2013 G4
106Crni Vrh Obs. in Slovenia, 2 in MPECs 2013-H07 & 2013-H10 -- C/2013 G7, C/2013 G6
I39Cruz del Sur Obs. in Argentina, 3 in MPECs 2013-H07, 2013-H08 & 2013-H10 -- 2013 GA80, C/2013 G7, C/2013 G6
958Dax Obs. in France, 1 in MPEC 2013-H10 -- C/2013 G7
113Drebach Obs. in Germany, 1 in MPEC 2013-H06 -- C/2013 G5
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 4 in MPECs 2013-H05, 2013-H06, 2013-H07 & 2013-H10 -- C/2013 G7, C/2013 G6, C/2013 G5, P/2013 G4
F65$Ernesto Guido in Italy via Faulkes Telescope North in Hawaii, 1 in MPEC 2013-H10 -- C/2013 G7
157Frasso Sabino Obs. in Italy, 6 in MPECs 2013-H04, 2013-H06, 2013-H07 & 2013-H10 -- 2013 GV68, C/2013 G7, C/2013 G6, C/2013 G5, 2013 EU9, 2013 EL28
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2013-H06 -- C/2013 G5
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2013-H05 -- P/2013 G4
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2013-H04 -- 2013 GH66
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2013-H05 -- P/2013 G4
711McDonald Obs. in Texas, 5 in MPECs 2013-H06, 2013-H07, 2013-H08, 2013-H09 & 2013-H10 -- 2013 GZ79, 2013 GA80, C/2013 G7, C/2013 G6, C/2013 G5
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2013-H09 -- 2013 GZ79
118Modra Obs. in Slovakia, 1 in MPEC 2013-H09 -- 2013 GZ79
C91Montevenere Obs., 1 in MPEC 2013-H06 -- C/2013 G5
G84Mt. Lemmon SkyCenter in Arizona, 1 in MPEC 2013-H10 -- C/2013 G7
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2013-H04, 2013-H06 & 2013-H07 -- C/2013 G6, C/2013 G5, 2010 GY6
A24New Millennium Obs. in Italy, 2 in MPECs 2013-H04 & 2013-H06 -- 2013 GS66, C/2013 G5
C47Nonndorf Obs. in Austria, 1 in MPEC 2013-H06 -- C/2013 G5
I41Palomar Transient Factory (PTF) in southern California, 4 in MPECs 2013-H04 & 2013-H09 -- 2013 GZ79, 2013 EM20, 2002 TY68, 354713
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2013-H03, 2013-H04 & 2013-H05 -- 2013 GD55, P/2013 G4, 2008 VN, 2008 TF4, 2008 GB110, 2007 HF44, 2005 GO22, 357622, 164201, 154229
A53Peschiera del Garda Obs. in Italy, 1 in MPEC 2013-H04 -- 2009 BL2
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2013-H04 -- 2013 GR38
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2013-H06 -- C/2013 G5
233San Vito Obs. in Italy, 3 in MPEC 2013-H04 -- 2013 EO126, 6047, 3752
204Schiaparelli Obs. in Italy, 4 in MPECs 2013-H06, 2013-H07, 2013-H08 & 2013-H09 -- 2013 GZ79, 2013 GA80, C/2013 G6, C/2013 G5
E12Siding Spring Survey in New South Wales, 1 in MPEC 2013-H10 -- C/2013 G7
G401program code 1 via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPEC 2013-H04 -- 2013 FY13, 4034
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2013-H04 -- 161998, 141495
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-H09 -- 2013 GZ79
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2013-H06 & 2013-H10 -- C/2013 G7, C/2013 G5
673!program code "!" (10) via Table Mtn. Obs. in southern California, 2 in MPECs 2013-H06 & 2013-H07 -- C/2013 G6, C/2013 G5
C75Whitestar Obs., 1 in MPEC 2013-H09 -- 2013 GZ79
H06iTelescope Obs. Mayhill in New Mexico, 2 in MPECs 2013-H08 & 2013-H10 -- 2013 GA80, C/2013 G7
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 4 in MPECs 2013-H05, 2013-H06, 2013-H07 & 2013-H10 -- C/2013 G7, C/2013 G6, C/2013 G5, P/2013 G4
Q621program code 1 via iTelescope Obs. Siding Spring in New South Wales, 4 in MPECs 2013-H04, 2013-H07 & 2013-H10 -- 2013 GH23, C/2013 G7, C/2013 G6, 99942
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 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 GG69NEODyS00562017-2111731.47e-07-3.56-4.480NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2013-04-10.432 to 2013-04-13.374."
2013 GF69NEODyS00562016-2112478.94e-07-3.09-3.360NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2013-04-10.424 to 2013-04-13.361."
2013 GM3NEODyS00562028-2090986.13e-05-4.97-5.740NEODyS: "Based on 50 optical observations (of which 2 are rejected as outliers) from 2013-04-03.322 to 2013-04-13.303."

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 16 April '13

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

2201Grabbed MPEC 2013-H10 - Comet C/2013 G7 (McNaught) - see above
2105Grabbed MPEC 2013-H08 - 2013 GA80 - see above
Grabbed MPEC 2013-H09 - 2013 GZ79 - see above
2026Grabbed MPEC 2013-H07 - Comet C/2013 G6 (Lemmon) - see above
1900Grabbed MPEC 2013-H06 - Comet C/2013 G5 (Catalina) - see above
1810Grabbed MPEC 2013-H05 - Comet P/2013 G4 (Panstarrs) - see above
1406Generated Traffic Report
1404Grabbed MPEC 2013-H04 - Daily Orbit Update - see above
0414Grabbed MPEC 2013-H01 - 2012 JG11 - see above
Grabbed MPEC 2013-H02 - 2008 HO3 - see above
Grabbed MPEC 2013-H03 - 2008 TF4 - see above
0056Noted that NEODyS has posted 2013 GF69 as an impact risk - see above
Noted that NEODyS has posted 2013 GG69 as an impact risk - see above
Noted that NEODyS has updated its 2013 GM3 risk assessment - see above