Contents  on 30 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 30 March '12

Eight objects reported inside ten LD

There are eight asteroids reported passing within ten lunar distances (LD) of Earth today. Inside Earth's Hill sphere, intruder 2012 FS35 travels from 2.65 to 3.42 LD, and intruder 2012 EG5 (risk-listed radar target) enters Earth's Hill sphere, flying from 4.56 to 2.71 LD. Further away, 2012 FV23 comes its closest to Earth on this passage, reaching 6.61 LD at 0633 UTC. 2012 FT35 is outbound from 5.47 to 6.41 LD, 2012 FM35 from 8.12 to 8.78 LD, and 2012 FX35 from 8.62 to 9.81 LD. 2012 FW35 is calcuated to enter the ten LD "bubble," passing from 11.3 to 9.6 LD*, and also newly announced 2012 FH58, traveling from 11.4 to 9.3 LD*.

With new observations and a new orbit solution, risk-listed 2012 FA57, which previously was reported to come inside ten LD today, arrives instead tomorrow. 2012 FS52 arrives inside ten LD on April 1st and 2007 HV4 on April 14th.

This report was updated at 2033 UTC with new discovery 2012 FH58 (MPEC) and, earlier, follow-up in today's DOU MPEC for 2012 FA57, 2012 FS52, 2012 FP35, 2012 FM35, 2012 FV23, 2012 EP10, 2012 EG5, and 2012 DA14. Today's traffic report was first posted at 1343 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. "LD*" indicates some passage uncertainty. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

Radar Astrometry  on 30 March '12

Radar observation of three objects

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


Data update noted at 0131 UTC when the database was dated 29 March


Data update noted at 2302 UTC when the database was dated 30 March


Data update noted at 2359 UTC when the database was dated 30 March

NEOCP Activity  on 30 March '12

The MPC's NEO Confirmation Page has 25 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 25 objects listed. Of these, twelve were "one nighters." The Tracking News counted a total of 35 listings on the NEOCP on this day.

New MPECs  on 30 March '12

Minor Planet Electronic Circulars

There were seven MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2012-F112 - "18:32 UT" - 2012 FJ58


MPEC 2012-F111 - "18:30 UT" - 2012 FH58


MPEC 2012-F110 - "18:28 UT" - 2012 FG58


MPEC 2012-F109 - "18:17 UT" - 2004 LV31 and 2004 LW31


MPEC 2012-F108 - "17:36 UT" - 2012 FE58


MPEC 2012-F107 - "17:34 UT" - 2012 FD58


<< DOU on 30 Mar. '12 >>  MPEC 2012-F106 - "06:03 UT" - Daily Orbit Update

Observers  on 30 March '12

A total of 31 observers appeared in this day's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 3 in radar -- 2012 FZ23, 2012 BT23, 2010 SV3
H21Astronomical Research Obs. Westfield in Illinois, 29 in MPEC 2012-F106 -- 2012 FZ23, 2012 FZ13, 2012 FU35, 2012 FS52, 2012 FS23, 2012 FR52, 2012 FR35, 2012 FQ52, 2012 FP52, 2012 FO35, 2012 FN35, 2012 FM35, 2012 FJ15, 2012 FC1, 2012 FA14, 2012 ES14, 2012 EO5, 2012 EM8, 2012 EL5, 2012 DX75, 2012 DW30, 2012 DP8, 2012 DA14, 2012 CP36, 2012 CC17, 2012 BZ76, 2011 YV15, 2011 XE1, 2010 FC6
B88Bigmuskie Obs. in Italy, 2 in MPEC 2012-F106 -- 2012 FO52, 2012 EG5
300Bisei Spaceguard Center in Japan, 14 in MPEC 2012-F106 -- 2011 YV15, 2011 YJ28, 2011 YA, 2011 SR69, 2011 SL102, 2008 WZ13, 32906, 21088, 20826, 16816, 163696, 3103, 1866, 433
I99Blanquita Obs. in Spain, 2 in MPEC 2012-F106 -- 2012 EG5, 2012 AA11
160Castelmartini Obs. in Italy, 5 in MPEC 2012-F106 -- 2012 DH4, 2012 BJ134, 2012 AA11, 263976, 141018
703Catalina Sky Survey (CSS) in Arizona, 5 in MPEC 2012-F106 -- 2012 EG5, 86667, 68348, 212546, 7977
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPEC 2012-F106 -- 2012 FY23, 2012 FS23, 2012 FO52, 2012 FD23
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2012-F106 -- 2012 DX75
A27Eridanus Obs. in Germany, 1 in MPEC 2012-F106 -- 2012 DH4
C76Estels Obs., 1 in MPEC 2012-F106 -- 2012 DO
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-F110 -- 2012 FG58
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-F108 -- 2012 FE58
046Klet Obs. in the Czech Republic, 6 in MPEC 2012-F106 -- 2012 FQ35, 2012 FJ, 2012 ES14, 2012 EL5, 2012 DX75, 2012 AA11
168Kourovskaya Obs. in Russia, 13 in MPEC 2012-F106 -- 2012 CD29, 2012 BJ134, 2012 BC20, 2011 YV15, 2011 WV134, 2011 SL102, 2010 SV3, 2009 AV, 2004 QJ7, 263976, 141018, 3103, 1620
704LINEAR in New Mexico, 7 in MPEC 2012-F106 -- 2012 ES14, 2011 YV15, 86667, 32906, 267221, 155334, 5587
C01Lohrmann Obs. in Germany, 3 in MPEC 2012-F106 -- 2012 EG5, 2012 DX75, 2012 AA11
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2012-F107, 2012-F108 & 2012-F110 -- 2012 FG58, 2012 FE58, 2012 FD58
568!program code "!" (10) on Mauna Kea in Hawaii, 2 in MPEC 2012-F109 -- 2004 LW31, 2004 LV31
5682David Tholen's team on Mauna Kea in Hawaii, 4 in MPECs 2012-F106 & 2012-F110 -- 2012 FR52, 2012 FG58, 2012 ES10, 2012 EP10
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2012-F106, 2012-F107, 2012-F111 & 2012-F112 -- 2012 FJ58, 2012 FH58, 2012 FD58, 2012 EU14, 2012 CK2, 2003 EO16, 41429, 32906, 317255, 312942, 190491
A24New Millennium Obs. in Italy, 34 in MPEC 2012-F106 -- 2012 EL5, 2012 EG5, 2012 DX75, 2011 YV15, 2011 SL102, 2004 QJ7, 2002 EM6, 1998 KN3, 68267, 318050, 317643, 312942, 306595, 275558, 267221, 263976, 24475, 238063, 21277, 163000, 162038, 154555, 152667, 141018, 136618, 9400, 6455, 6050, 5620, 5587, 4055, 3352, 3103, 1862
716Palmer Divide Obs. in Colorado, 1 in MPEC 2012-F106 -- 2012 AA11
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2012-F106 & 2012-F110 -- 2012 FG58, 2012 DX75, 234341, 3352
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 12 in MPEC 2012-F106 -- 2012 FQ35, 2012 ES14, 2012 EG5, 2012 DX75, 2012 AA11, 2011 YV15, 2004 QJ7, 89959, 317643, 306595, 263976, 163243
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-F106 -- 2012 FV23
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-F108 -- 2012 FE58
510Siegen Obs. in Germany, 4 in MPEC 2012-F106 -- 2012 FP35, 2012 EG5, 3352, 1036
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2012-F106 -- 18109, 180186, 162581, 136874
291Spacewatch 1.8m telescope in Arizona, 17 in MPECs 2012-F106 & 2012-F107 -- 2012 FS23, 2012 FD58, 2012 FA57, 2012 FA14, 2012 EZ11, 2012 EC, 2012 DY32, 2012 DV32, 2012 DQ32, 2012 DG61, 2012 DE61, 2012 CP36, 2012 CL2, 2012 AC13, 2011 YB40, 2011 WS2, 2009 WG54
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-F110 -- 2012 FG58
I76Tesla Obs., 2 in MPEC 2012-F106 -- 2012 EG5, 2012 AA11
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 March '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.
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 Sentry13412047-211159.2e-08-7.63-7.910JPL: "Analysis based on 23 observations spanning 1.9923 days (2012-Mar-28.18963 to 2012-Mar-30.18189)." Diameter approximately 0.023 km. from mean, weighted H=25.9.
NEODyS13412075-207633.07e-07-7.12-7.30NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2012-03-28.190 to 2012-03-30.183."
2012 ES10JPL Sentry13412054-206461.3e-06-4.88-5.180JPL: "Analysis based on 33 observations spanning 12.944 days (2012-Mar-15.36929 to 2012-Mar-28.313591)." Diameter approximately 0.061 km. from mean, weighted H=23.7.
2012 EP10JPL Sentry13412063-2111449.2e-05-6.48-6.760JPL: "Analysis based on 31 observations spanning 13.030 days (2012-Mar-15.27159 to 2012-Mar-28.301474)." Diameter approximately 0.005 km. from mean, weighted H=29.2.
2012 EG5JPL Sentry1341210725.9e-07-6.27-6.550JPL: "Analysis based on 326 observations spanning 16.861 days (2012-Mar-13.30201 to 2012-Mar-30.16329)." Diameter approximately 0.047 km. from mean, weighted H=24.3.
2012 ECJPL Sentry1341209918.1e-08-6.82-6.820JPL: "Analysis based on 96 observations spanning 28.868 days (2012-Mar-01.3419 to 2012-Mar-30.2103)." Diameter approximately 0.069 km. from mean, weighted H=23.4.
NEODyS1341R E M O V E D-
2012 DA14JPL Sentry13412020-2057933.1e-04-3.07-3.630JPL: "Analysis based on 165 observations spanning 35.266 days (2012-Feb-23.03431 to 2012-Mar-29.300732)." Diameter approximately 0.045 km. from mean, weighted H=24.4.
NEODyS13412020-20902405.37e-04-2.94-3.60NEODyS: "Based on 168 optical observations (of which 4 are rejected as outliers) from 2012-02-23.029 to 2012-03-29.301."

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 30 March '12

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

2359Noted Radar Astrometry database update - see above
2302Noted Radar Astrometry database update - see above
2033Updated Traffic Report
1834Grabbed MPEC 2012-F107 - 2012 FD58 - see above
Grabbed MPEC 2012-F108 - 2012 FE58 - see above
Grabbed MPEC 2012-F109 - 2004 LV31 and 2004 LW31 - see above
Grabbed MPEC 2012-F110 - 2012 FG58 - see above
Grabbed MPEC 2012-F111 - 2012 FH58 - see above
Grabbed MPEC 2012-F112 - 2012 FJ58 - see above
1341Noted 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 updated its 2012 EC risk assessment - see above
Noted that NEODyS has removed 2012 EC as an impact risk - see above
Noted that JPL Sentry has updated its 2012 EG5 risk assessment - see above
Noted that JPL Sentry has updated its 2012 EP10 risk assessment - see above
Noted that JPL Sentry has updated its 2012 ES10 risk assessment - 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-F106 - Daily Orbit Update - see above
0131Noted Radar Astrometry database update - see above