Contents  on 26 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 26 March '12

Eight objects reported inside ten LD

Eight objects are reported moving within ten lunar distances (LD) of our planet today. Intruder 2012 FS35 travels inside the Earth-Moon system at 0.65 to 0.31 LD and intruder 2012 FP35 is also within one LD of both Earth and Moon. Inside Earth's Hill sphere, risk-listed 2012 FT35 comes its closest to the Moon on this passage, reaching 2.26 LD at 0329 UTC, and 2012 FU23 exits Earth's Hill sphere, passing from 3.09 to 5.48 LD. Further out, 2012 FX35 is headed away from 4.51 to 5.37 LD and 2012 FM35 from 5.69 to 6.25 LD, while 2012 EL8 departs from inside ten LD, moving from 9.9 to 10.4 LD*, and 2012 FV23 is inbound from 8.87 to 8.01 LD.

Coming toward Earth next, intruder 2012 EG5 (risk-listed radar target) arrives inside ten LD tomorrow, 2012 FW35 on March 30th, and returning 2007 HV4 on April 14th.

This report was updated at 1607 UTC with follow-up in today's DOU MPEC for 2012 FS35, 2012 FP35, 2012 FM35, 2012 FV23, and 2012 EG5, as well as departed 2012 ER10, which had only a one-day observing arc until this recovery. Today's traffic report was first posted at 0139 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.

NEOCP Activity  on 26 March '12

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of 21 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 26 March '12

Minor Planet Electronic Circulars

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

MPEC 2012-F91 - "17:45 UT" - Comet P/2012 F5 (Gibbs)

MPEC 2012-F90 - "15:39 UT" - 2011 SB16

<< DOU on 26 Mar. '12 >>  MPEC 2012-F89 - "06:03 UT" - Daily Orbit Update

MPEC 2012-F88 - "01:10 UT" - Comet C/2012 F6 (Lemmon)

Observers  on 26 March '12

A total of 32 observers appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2012-F89 -- 2012 FQ35
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2012-F88 & 2012-F89 -- C/2012 F6, 2012 DN, 2012 DH61
B88Bigmuskie Obs. in Italy, 2 in MPEC 2012-F89 -- 2012 EG5, 2011 SL102
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-F89 -- 2012 FM35
703Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2012-F89 & 2012-F91 -- P/2012 F5, 2012 ES14, 2012 DO, 2010 LR33, 68267, 312942, 275976, 237805, 208565, 4055
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2012-F89 & 2012-F90 -- 2012 FZ23, 2012 FY23, 2012 BK11, 2011 SB16, 2003 QN47
C73Galati Obs. in Romania, 1 in MPEC 2012-F89 -- 2012 FQ35
372Geisei Obs. in Japan, 1 in MPEC 2012-F91 -- P/2012 F5
203GiaGa Obs. in Italy, 3 in MPEC 2012-F89 -- 2012 FQ35, 2012 CA55, 2012 AA11
J95Great Shefford Obs. in England, 4 in MPECs 2012-F88 & 2012-F89 -- 2012 FS35, 2012 FQ35, 2012 FP35, C/2012 F6
A17Guidestar Obs. in Germany, 1 in MPEC 2012-F89 -- 2012 FQ35
379Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2012-F89 -- 2012 DX75, 2012 DH4, 2012 AA11, 2011 YV15
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-F89 -- 2012 FZ23
B15Inastars Obs. in Germany, 1 in MPEC 2012-F89 -- 2012 EG5
246KLENOT in the Czech Republic, 1 in MPEC 2012-F89 -- 2012 FR35
704LINEAR in New Mexico, 9 in MPEC 2012-F89 -- 2012 FQ35, 2012 EM8, 2011 XO3, 312942, 275558, 189008, 163000, 9400, 4055
A14Les Engarouines Obs. in France, 1 in MPEC 2012-F89 -- 85236
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2012-F88 -- C/2012 F6
C10Maisoncelles Obs. in France, 1 in MPEC 2012-F91 -- P/2012 F5
B90Malina River Obs. in Italy, 1 in MPEC 2012-F91 -- P/2012 F5
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2012-F89 -- 2012 DF61, 2002 AW
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2012-F88 & 2012-F89 -- C/2012 F6, 2011 WV134, 2006 SW5, 2001 CK32, 174806, 138404, 137084, 12923
A13Naef Obs. in Switzerland, 3 in MPEC 2012-F89 -- 2012 DX75, 16912, 3352
H23Pear Tree Obs. in Florida, 2 in MPEC 2012-F89 -- 2012 DX75, 2012 BC20
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 14 in MPEC 2012-F89 -- 2012 FZ23, 2012 EL5, 2012 EG5, 2012 DX75, 2012 CA55, 2012 AA11, 2011 YV15, 2011 SL102, 2011 QD48, 2004 QJ7, 306595, 267221, 263976, 163243
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-F88 -- C/2012 F6
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-F89 -- 2012 FP35
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-F88 -- C/2012 F6
204Schiaparelli Obs. in Italy, 3 in MPECs 2012-F88 & 2012-F89 -- 2012 FV23, C/2012 F6, 2012 DG31
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2012-F89 -- 2012 FZ23, 2012 FS23
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2012-F89 -- 39557, 312942, 4055
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2012-F89 -- 2012 FQ1, 2012 FB1, 2012 ET14, 2012 ER10, 2012 EO10, 2012 EC, 2001 CK32
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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.





Notes for Today's Latest Risk Assessments
2012 FT35JPL Sentry0138210715.2e-09-10.81-10.80JPL: "Analysis based on 25 observations spanning 1.6568 days (2012-Mar-24.22216 to 2012-Mar-25.878915)." Diameter approximately 0.005 km. from mean, weighted H=29.2.
2012 FQ1JPL Sentry1606R E M O V E DJPL: Risk listing removed at 0850 UTC.
2012 EG5JPL Sentry1606210712.8e-07-6.59-6.590JPL: "Analysis based on 157 observations spanning 12.871 days (2012-Mar-13.30201 to 2012-Mar-26.1735)." Diameter approximately 0.047 km. from mean, weighted H=24.3.
2012 ECJPL Sentry16062083-209932.1e-06-5.41-5.620JPL: "Analysis based on 90 observations spanning 23.920 days (2012-Mar-01.3419 to 2012-Mar-25.26236)." Diameter approximately 0.067 km. from mean, weighted H=23.5.
NEODyS16062083-209021.18e-06-5.64-5.650NEODyS: "Based on 90 optical observations (of which 0 are rejected as outliers) from 2012-03-01.343 to 2012-03-25.263."

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 26 March '12

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

1817Grabbed MPEC 2012-F91 - Comet P/2012 F5 (Gibbs) - see above
1607Updated Traffic Report
1606Noted that JPL Sentry has updated its 2012 EC risk assessment - see above
Noted that NEODyS has updated its 2012 EC risk assessment - see above
Noted that JPL Sentry has updated its 2012 EG5 risk assessment - see above
Noted that JPL Sentry has removed 2012 FQ1 as an impact risk - see above
Grabbed MPEC 2012-F89 - Daily Orbit Update - see above
Grabbed MPEC 2012-F90 - 2011 SB16 - see above
0138Noted that JPL Sentry has posted 2012 FT35 as an impact risk - see above
Grabbed MPEC 2012-F88 - Comet C/2012 F6 (Lemmon) - see above