Contents  on 17 April '12

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 17 April '12

Four objects reported inside ten LD

Four visitors are reported flying within ten lunar distances (LD) of Earth today. 2012 GW11 is inbound from 8.14 to 5.59 LD and unreported 2007 HV4 may be moving from 6.5 to 5.3 LD (with an Earth passage uncertainty of +/- 1.748 days), while radar target 2012 GP1 comes within ten LD, traveling from 10.04 to 9.61 LD, and 2012 GY11 departs from inside ten LD, passing from 9.85 to 10.62 LD.

Coming toward Earth next, newly discovered 2012 HE arrives inside ten LD on April 19th, 2012 HM, also newly announced, arrives on April 21st (uncertainty +/- 4.200 hours), and 1992 JD on April 30th (uncertainty +/- 4.600 hours).

This report was generated at 1736 UTC with two new discoveries: already departed 2012 HN (MPEC) and approaching 2012 HM (MPEC). Earlier today discovery 2012 HE was announced (MPEC) and there was follow-up in today's DOU MPEC for 2012 GP1 and departed 2012 FM35.

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 17 April '12

The MPC's NEO Confirmation Page has 41 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 41 objects listed. Of these, 32 were "one nighters." So far The Tracking News has counted a total of 61 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 17 April '12

Minor Planet Electronic Circulars

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

MPEC 2012-H17 - "18:14 UT" - Comet P/2012 G1 (Panstarrs)

MPEC 2012-H16 - "16:42 UT" - 2012 GV17

MPEC 2012-H15 - "14:46 UT" - 2012 HO

MPEC 2012-H14 - "14:44 UT" - 2012 HN

MPEC 2012-H13 - "14:42 UT" - 2012 HM

MPEC 2012-H12 - "14:40 UT" - 2012 HL

MPEC 2012-H11 - "14:38 UT" - 2012 HK

<< DOU on 17 Apr. '12 >>  MPEC 2012-H10 - "06:03 UT" - Daily Orbit Update

MPEC 2012-H09 - "00:26 UT" - 2012 HE

Observers  on 17 April '12

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-H10 -- 2012 GD2
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2012-H11, 2012-H12, 2012-H13, 2012-H15 & 2012-H16 -- 2012 HO, 2012 HM, 2012 HL, 2012 HK, 2012 GV17
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2012-H10 -- 2012 GP1
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-H09 -- 2012 HE
I77CEAMIG-REA in Brazil, 1 in MPEC 2012-H10 -- 2012 GD2
703Catalina Sky Survey (CSS) in Arizona, 9 in MPECs 2012-H09, 2012-H10, 2012-H11 & 2012-H12 -- 2012 HL, 2012 HK, 2012 HE, 2012 DO, 2012 AA11, 2011 YV15, 154144, 152667, 141531
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2012-H10, 2012-H11 & 2012-H12 -- 2012 HL, 2012 HK, 2012 FB57, 2011 XO3
822Cordoba Obs. in Argentina, 1 in MPEC 2012-H11 -- 2012 HK
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 3 in MPECs 2012-H11, 2012-H12 & 2012-H14 -- 2012 HN, 2012 HL, 2012 HK
F65$Ernesto Guido in Italy via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-H17 -- P/2012 G1
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 2 in MPECs 2012-H10 & 2012-H16 -- 2012 GV17, 2008 HW1
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-H17 -- P/2012 G1
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-H10 -- 1998 HE3
704LINEAR in New Mexico, 5 in MPECs 2012-H10 & 2012-H13 -- 2012 HM, 2012 GK, 2011 SL102, 317643, 1620
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2012-H11, 2012-H13, 2012-H15 & 2012-H16 -- 2012 HO, 2012 HM, 2012 HK, 2012 GV17
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-H10 -- 2012 GD5
900Moriyama Obs. in Japan, 2 in MPECs 2012-H11 & 2012-H13 -- 2012 HM, 2012 HK
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPECs 2012-H10, 2012-H14, 2012-H15, 2012-H16 & 2012-H17 -- 2012 HO, 2012 HN, 2012 GV17, P/2012 G1, 2012 FM52, 2012 DO, 89830, 163051, 153958, 143947, 143381, 141531, 137158
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-H17 -- P/2012 G1
I33SOAR in Chile, 1 in MPEC 2012-H17 -- P/2012 G1
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2012-H11 -- 2012 HK
H36Sandlot Obs. in Kansas, 2 in MPECs 2012-H11 & 2012-H12 -- 2012 HL, 2012 HK
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2012-H11 & 2012-H12 -- 2012 HL, 2012 HK
J84South Obs. in England, 1 in MPEC 2012-H10 -- 2012 GP1
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-H10 -- 1998 HE3
291Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2012-H10, 2012-H14, 2012-H15 & 2012-H17 -- 2012 HO, 2012 HN, 2012 GP1, P/2012 G1, 2012 FO62, 2012 FM35, 2012 EP5, 2012 DO8, 2012 CL29, 2011 MD5, 2010 SO16, 2009 QF31, 2003 GH21, 100926
I93St. Pardon de Conques Obs. in France, 5 in MPECs 2012-H09, 2012-H11, 2012-H12, 2012-H14 & 2012-H15 -- 2012 HO, 2012 HN, 2012 HL, 2012 HK, 2012 HE
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2012-H10 -- 2012 GD2, 2012 ES14, 141018
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 April '12

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
2012 GV17JPL Sentry19172031-21111467.1e-07-4.28-5.390JPL: "Analysis based on 12 observations spanning 2.8859 days (2012-Apr-14.34248 to 2012-Apr-17.22839)." Diameter approximately 0.195 km. from mean, weighted H=21.2.
2012 GA12NEODyS16232064-206419.19e-11-8.65-8.650NEODyS: "Based on 8 optical observations (of which 0 are rejected as outliers) from 2012-04-15.440 to 2012-04-16.568."

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 17 April '12

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

1917Noted that JPL Sentry has posted 2012 GV17 as an impact risk - see above
1832Grabbed MPEC 2012-H17 - Comet P/2012 G1 (Panstarrs) - see above
1736Generated Traffic Report
1652Grabbed MPEC 2012-H16 - 2012 GV17 - see above
1623Noted that NEODyS has posted 2012 GA12 as an impact risk - see above
Grabbed MPEC 2012-H10 - Daily Orbit Update - see above
Grabbed MPEC 2012-H11 - 2012 HK - see above
Grabbed MPEC 2012-H12 - 2012 HL - see above
Grabbed MPEC 2012-H13 - 2012 HM - see above
Grabbed MPEC 2012-H14 - 2012 HN - see above
Grabbed MPEC 2012-H15 - 2012 HO - see above
0101Grabbed MPEC 2012-H09 - 2012 HE - see above