Contents  on 1 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 1 April '12

Ten objects reported inside ten LD

Ten visitors are reported to be within ten lunar distances (LD) of our planet today. Intruder 2012 EG5 (risk-listed radar target) is inside the Earth-Moon system for much of the day. Out further, 2012 FH58 is inbound from 7.31 to 5.52 LD, risk-listed 2012 FA57 from 8.11 to 6.08 LD, and 2012 FW35 comes its closest to Earth this time around, reaching 8.3 LD at about 1801 UTC with an uncertainty of 1.53 hours. Intruder 2012 FS35 is headed away from 4.18 to 4.94 LD, 2012 FV23 from 7.03 to 7.61 LD, and 2012 FT35 from 7.35 to 8.30 LD. Coming inside ten LD are newly discovered 2012 FQ62, traveling from 10.67 to 6.98 LD, and 2012 FS52, passing from 11.27 to 9.43 LD, while 2012 FM35 leaves ten LD, moving from 9.45 to 10.14 LD.

Next up is returning 2007 HV4, which arrives inside ten LD on April 14th.

This report was updated at 1518 and slightly revised at 1837 UTC with follow-up in today's DOU MPEC for 2012 FH58, 2012 FA57, 2012 FS52, 2012 FM35, 2012 EG5, and 2012 DA14. Today's first traffic report was posted at 0556 UTC with new discovery 2012 FQ62 (MPEC).


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 1 April '12

The MPC's NEO Confirmation Page has 19 listings

When last checked at 1911 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nineteen objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 37 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 1 April '12

Minor Planet Electronic Circulars

As of last check at 1911 UTC, there have been nine MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2012-G09 - "15:58 UT" - 2012 FU62


MPEC 2012-G08 - "15:56 UT" - 2012 FT62


<< DOU on 1 Apr. '12 >>  MPEC 2012-G07 - "06:03 UT" - Daily Orbit Update


MPEC 2012-G06 - "03:16 UT" - 2012 FS62


MPEC 2012-G05 - "03:13 UT" - 2012 FR62


MPEC 2012-G04 - "03:11 UT" - 2012 FQ62


MPEC 2012-G03 - "03:09 UT" - 2012 FP62


MPEC 2012-G02 - "03:07 UT" - 2012 FO62


MPEC 2012-G01 - "03:05 UT" - 2012 FN62

Observers  on 1 April '12

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 3 in MPEC 2012-G07 -- 2012 AA11, 317643, 141018
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPEC 2012-G07 -- 2012 FZ23, 2012 FR35, 2012 FQ52, 2012 FQ35, 2012 FP52, 2012 FO52, 2012 FM35, 2012 FH58, 2012 FH38, 2012 FG58, 2012 FB57, 2012 FA57, 2012 ES14, 2012 EA2, 2012 DF61, 2012 BZ76, 2012 AA11, 2011 SL102
B88Bigmuskie Obs. in Italy, 3 in MPEC 2012-G07 -- 2012 AA11, 2011 SL102, 2004 QJ7
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2012-G02, 2012-G03 & 2012-G07 -- 2012 FS52, 2012 FP62, 2012 FO62
I39Cruz del Sur Obs. in Argentina, 3 in MPEC 2012-G07 -- 2004 FF29, 86667, 3122
448Desert Moon Obs. in New Mexico, 6 in MPEC 2012-G07 -- 2012 FN52, 2012 FK35, 2012 FJ, 2012 EL5, 319988, 267221
I19El Gato Gris Obs. in Argentina, 2 in MPECs 2012-G02 & 2012-G03 -- 2012 FP62, 2012 FO62
A27Eridanus Obs. in Germany, 1 in MPEC 2012-G07 -- 2012 AA11
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 3 in MPECs 2012-G03, 2012-G06 & 2012-G07 -- 2012 FS62, 2012 FP62, 2012 EG5
J95Great Shefford Obs. in England, 4 in MPECs 2012-G01, 2012-G04 & 2012-G07 -- 2012 FQ62, 2012 FN62, 2012 EG5, 2004 FF29
A17Guidestar Obs. in Germany, 3 in MPEC 2012-G07 -- 2012 FN52, 2012 FG58, 53110
704LINEAR in New Mexico, 2 in MPEC 2012-G07 -- 2012 FS52, 2012 DO
A14Les Engarouines Obs. in France, 2 in MPEC 2012-G07 -- 275558, 163000
844Los Molinos Obs. in Uruguay, 1 in MPEC 2012-G07 -- 2012 FY23
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2012-G02 -- 2012 FO62
5682David Tholen's team on Mauna Kea in Hawaii, 4 in MPECs 2012-G02, 2012-G04, 2012-G08 & 2012-G09 -- 2012 FU62, 2012 FT62, 2012 FQ62, 2012 FO62
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2012-G01, 2012-G05, 2012-G06, 2012-G07 & 2012-G09 -- 2012 FU62, 2012 FS62, 2012 FR62, 2012 FN62, 2004 FF29
A13Naef Obs. in Switzerland, 1 in MPEC 2012-G07 -- 302830
A24New Millennium Obs. in Italy, 1 in MPEC 2012-G07 -- 2012 EG5
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2012-G02, 2012-G04, 2012-G06, 2012-G07, 2012-G08 & 2012-G09 -- 2012 FU62, 2012 FT62, 2012 FS62, 2012 FQ62, 2012 FO62, 208565
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2012-G07 -- 2012 ES14, 2012 DX75, 2012 DO, 2011 YV15
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-G02 -- 2012 FO62
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2012-G03 -- 2012 FP62
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2012-G07 -- 2012 FZ23, 2011 YU62
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-G03 -- 2012 FP62
291Spacewatch 1.8m telescope in Arizona, 18 in MPECs 2012-G01, 2012-G03, 2012-G05, 2012-G07, 2012-G08 & 2012-G09 -- 2012 FV35, 2012 FU62, 2012 FT62, 2012 FR62, 2012 FR52, 2012 FP62, 2012 FN62, 2012 FL35, 2012 FG58, 2012 FD1, 2012 FA57, 2012 FA14, 2012 ET14, 2012 EC, 2012 DH61, 2012 DA14, 2012 CL29, 2010 CN1
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2012-G01, 2012-G03 & 2012-G04 -- 2012 FQ62, 2012 FP62, 2012 FN62
926Tenagra II Obs. in Arizona, 2 in MPECs 2012-G02 & 2012-G06 -- 2012 FS62, 2012 FO62
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 April '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 1911 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
2012 FA57JPL Sentry15142051-211132.8e-08-8.15-8.410JPL: "Analysis based on 29 observations spanning 2.9637 days (2012-Mar-28.18963 to 2012-Mar-31.1533)." Diameter approximately 0.022 km. from mean, weighted H=25.9.
NEODyS15142051-208448.58e-08-7.52-7.620NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2012-03-28.190 to 2012-03-31.154."
2012 EG5JPL Sentry1514R E M O V E DJPL: Risk listing removed at 0856 UTC.
2012 ECJPL Sentry1514R E M O V E DJPL: Risk listing removed at 0853 UTC.
2012 DA14JPL Sentry15142020-2057923.1e-04-3.06-3.610JPL: "Analysis based on 168 observations spanning 37.408 days (2012-Feb-23.03431 to 2012-Mar-31.44248)." Diameter approximately 0.045 km. from mean, weighted H=24.4.
NEODyS15142020-20892375.45e-04-2.93-3.590NEODyS: "Based on 171 optical observations (of which 4 are rejected as outliers) from 2012-02-23.029 to 2012-03-31.443."

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 1 April '12

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

1634Grabbed MPEC 2012-G08 - 2012 FT62 - see above
Grabbed MPEC 2012-G09 - 2012 FU62 - see above
1518Updated Traffic Report
1514Noted that JPL Sentry has updated its 2012 DA14 risk assessment - see above
Noted that NEODyS has updated its 2012 DA14 risk assessment - see above
Noted that JPL Sentry has removed 2012 EC as an impact risk - see above
Noted that JPL Sentry has removed 2012 EG5 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 FA57 risk assessment - see above
Noted that NEODyS has updated its 2012 FA57 risk assessment - see above
Grabbed MPEC 2012-G07 - Daily Orbit Update - see above
0339Grabbed MPEC 2012-G04 - 2012 FQ62 - see above
Grabbed MPEC 2012-G05 - 2012 FR62 - see above
Grabbed MPEC 2012-G06 - 2012 FS62 - see above
0310Grabbed MPEC 2012-G01 - 2012 FN62 - see above
Grabbed MPEC 2012-G02 - 2012 FO62 - see above
Grabbed MPEC 2012-G03 - 2012 FP62 - see above