Contents  on 29 March '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 29 March '12

Seven objects reported inside ten LD

There are seven objects reported to be within ten lunar distances (LD) of our planet today. Within Earth's Hill sphere, intruder 2012 FS35 is moving away from 1.88 to 2.65 LD. Further out, intruder 2012 EG5 (risk-listed radar target) is inbound from 6.43 to 4.56 LD and 2012 FV23 from 6.84 to 6.62 LD, while 2012 FT35 is outbound from 4.55 to 5.47 LD, 2012 FX35 from 7.47 to 8.62 LD, and 2012 FM35 from 7.47 to 8.12 LD, and intruder 2012 FP35 departs from inside ten LD, passing from 8.71 to 11.86 LD.

On approach, 2012 FW35 and risk-listed 2012 FA57 arrive inside ten LD tomorrow, 2012 FS52 on April 1st, and 2007 HV4 on April 14th.

This report was updated at 2359 UTC with follow-up in radar for 2012 EO8 and, earlier, follow-up in today's DOU MPEC for 2012 FA57, 2012 FX35, 2012 FM35, and 2012 EG5. This report was previously updated at 1424 UTC.


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.

Radar Astrometry  on 29 March '12

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2310 UTC when the database was dated 29 March

NEOCP Activity  on 29 March '12

The MPC's NEO Confirmation Page has 31 listings

When last checked at 2334 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 31 objects listed. Of these, 20 were "one nighters."

New MPECs  on 29 March '12

Minor Planet Electronic Circulars

There was one MPEC posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 29 Mar. '12 >>  MPEC 2012-F105 - "06:03 UT" - Daily Orbit Update

Observers  on 29 March '12

A total of 34 observers appeared in this day's MPEC.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2012-F105 -- 2012 FZ23
251Arecibo in Puerto Rico, 1 in radar -- 2012 EO8
B88Bigmuskie Obs. in Italy, 1 in MPEC 2012-F105 -- 171819
300Bisei Spaceguard Center in Japan, 2 in MPEC 2012-F105 -- 2012 FQ52, 2012 FP52
G43Buenaventura Suarez Obs., 1 in MPEC 2012-F105 -- 2009 WD106
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2012-F105 -- 2012 DZ32, 2004 FF29, 85628, 85275, 155336, 1862
C13Como Obs. in Italy, 1 in MPEC 2012-F105 -- 2006 VY13
850Cordell-Lorenz Obs. in Tennessee, 2 in MPEC 2012-F105 -- 2012 EG5, 2012 DX75
I39Cruz del Sur Obs. in Argentina, 4 in MPEC 2012-F105 -- 312473, 11066, 7341, 5836
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 4 in MPEC 2012-F105 -- 2012 FZ23, 2012 FP52, 2011 XO3, 20826
151Eschenberg Obs. in Switzerland, 1 in MPEC 2012-F105 -- 2012 EG5
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2012-F105 -- 2012 DX75, 2012 AA11, 2011 YV15
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-F105 -- 2012 FZ23
B15Inastars Obs. in Germany, 1 in MPEC 2012-F105 -- 2012 EG5
046Klet Obs. in the Czech Republic, 1 in MPEC 2012-F105 -- 2012 EG5
704LINEAR in New Mexico, 3 in MPEC 2012-F105 -- 2012 AA11, 89959, 317643
J38La Vara Obs. in Spain, 1 in MPEC 2012-F105 -- 2012 EG5
130Lumezzane Obs. in Italy, 5 in MPEC 2012-F105 -- 312942, 267221, 238063, 6053, 5620
C91Montevenere Obs., 1 in MPEC 2012-F105 -- 2012 EG5
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPEC 2012-F105 -- 2012 EM8, 2011 QF14, 2008 SQ, 2002 AW, 163000, 162422
A13Naef Obs. in Switzerland, 3 in MPEC 2012-F105 -- 2012 AN23, 234341, 5587
A24New Millennium Obs. in Italy, 19 in MPEC 2012-F105 -- 2012 FA57, 2012 EL5, 2012 DX75, 2011 YV15, 2011 SL102, 2004 QJ7, 68267, 318050, 317643, 306595, 263976, 238063, 21277, 154555, 9400, 6455, 5620, 5587, 3352
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPEC 2012-F105 -- 2012 FR35, 2010 CN1, 1994 NK, 302311, 21277, 189008, 186822, 171819, 138205, 100926
H23Pear Tree Obs. in Florida, 1 in MPEC 2012-F105 -- 2012 DX75
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2012-F105 -- 2012 ES14, 2012 EG5, 2012 DX75, 2012 AA11, 2011 YV15
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-F105 -- 2012 EG5
H36Sandlot Obs. in Kansas, 3 in MPEC 2012-F105 -- 2012 FX35, 2012 FM35, 2011 GB55
204Schiaparelli Obs. in Italy, 7 in MPEC 2012-F105 -- 2012 FX35, 2012 FQ35, 2008 EY5, 2001 HA8, 1999 JO8, 1995 DW1, 1994 NK
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPEC 2012-F105 -- 2012 FY23, 2012 FD23, 2012 DO, 11066
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2012-F105 -- 2012 FM35, 2012 DX32, 189008, 16657, 136618, 3102
291Spacewatch 1.8m telescope in Arizona, 15 in MPEC 2012-F105 -- 2012 FW23, 2012 FJ15, 2012 EZ11, 2012 ER14, 2012 EP5, 2012 DY32, 2012 DQ32, 2012 CP2, 2012 CL19, 2011 YB40, 2011 WS2, 2010 SO16, 2009 WG54, 2009 QY33, 2004 HH33
I76Tesla Obs., 2 in MPEC 2012-F105 -- 2012 EG5, 2012 AA11
C92Valdicerro Obs. in Italy, 1 in MPEC 2012-F105 -- 2012 FB57
718Wiggins Obs. in Utah, 1 in MPEC 2012-F105 -- 2012 EG5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 March '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2347 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 Sentry14242029-2075142.8e-06-5.96-6.550JPL: "Analysis based on 20 observations spanning .74581 days (2012-Mar-28.18963 to 2012-Mar-28.93544)." Diameter approximately 0.022 km. from mean, weighted H=25.9.
NEODyS14242044-209093.02e-06-5.94-6.450NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2012-03-28.190 to 2012-03-28.936."
2012 EG5JPL Sentry1424210726.6e-07-6.21-6.460JPL: "Analysis based on 267 observations spanning 15.843 days (2012-Mar-13.30201 to 2012-Mar-29.14498)." Diameter approximately 0.048 km. from mean, weighted H=24.3.

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 29 March '12

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

2359Updated Traffic Report
2310Noted Radar Astrometry database update - see above
1424Noted that JPL Sentry has updated its 2012 EG5 risk assessment - see above
Noted that JPL Sentry has updated its 2012 FA57 risk assessment - see above
Noted that NEODyS has posted 2012 FA57 as an impact risk - see above
Grabbed MPEC 2012-F105 - Daily Orbit Update - see above