Contents on 10 March '13
- Traffic Report -- three objects
- IAU Minor Planet Center
- Observers -- ten observers
- Impact Risk Monitoring -- three objects
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page (archive)
Of 480 risk-listed objects, 21 have had news in the last 31 days. Updated at 1627 UTC on 10 March.
- Ephemerides for risk-rated & nearby objects + potential mission destinations
- News image catalog
- News old archive & Small Objects Archive
- Object Links - mainly for radar targets & close passers - updated 20 Feb.
- Observing Campaigns
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 10 March '13
Three objects reported inside ten LD
Three asteroids are reported to be not just within a radius of ten lunar distances (LD) from Earth today but, as with yesterday and the day before, all three are inside Earth's Hill sphere. Radar target intruder 2013 EC20 comes its closest to the Moon this time around, 0.77 LD at 0536 UT, and exits the Earth-Moon system at 1031 UT. 2013 EN20 comes its closest to Earth on this passage, reaching 1.2 LD at about 1504 UTC (uncertainty: +/- 21 minutes). And radar target 2013 ET exits Earth's Hill sphere, passing from 2.86 to 4.72 LD.
Headed our way next, risk-listed radar target 2010 EO88 arrives inside ten LD on March 15th and risk-listed 2013 ES11 arrives on March 19th.
This report was generated at 1629 UTC with follow-up in today's DOU MPEC for 2013 ET and distant 136617 1994 CC.
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.
NEOCP Activity on 10 March '13
The MPC's NEO Confirmation Page has 12 listings
When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had twelve objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of eighteen 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 10 March '13
Minor Planet Electronic Circulars
As of last check at 2359 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2013-E43 time-stamped "06:05 UT" - Daily Orbit Update - see below
- MPEC 2013-E44 time-stamped "11:37 UT" - 2013 EK28 - see below
- MPEC 2013-E45 time-stamped "11:42 UT" - 2013 EL28
MPEC 2013-E45 - "11:42 UT" - 2013 EL28
- K13E28L 2013 EL28 (risk listed, H=22.0 ~135m) from Pan-STARRS 1 (PS1) (March 8.61-62p2), St. Pardon de Conques Obs. (March 9.97-99p3), and Schiaparelli Obs. (March 10.15-19p3)
MPEC 2013-E44 - "11:37 UT" - 2013 EK28
- K13E28K 2013 EK28 (small asteroid, H=23.1 ~81m) from PS1 (March 8.46-49p3) and Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (March 9.19-21p5 & 10.20-21p4)
- Observations of close-passing objects
- K13E00T 2013 ET (arc=6 days, H=23.1 ~81m, radar support) from Zonalunar Obs. (March 8.93p3)
- D6617 136617 1994 CC from PS1 (March 9.31-33p11 & 9.46-47p4)
- Observation campaigns (radar support, potential mission destinations)
- 68278 68278 2001 FC7 (PMD) from Naef Obs. (March 9.90-93p2)
-- Potential mission destinations list & ephemerides + NHATS -- Planetary radar schedules: Arecibo & Goldstone
- Observations of other asteroidal objects
- K13E28C 2013 EC28 (arc=3 days, H=20.6 ~257m) from Indian Hill North Obs. (March 9.12-15p2 & 9.19p1)
- K13E20M 2013 EM20 (arc=4 days, H=19.6 ~407m) from Holmes/CTIO (March 9.40-41p2)
- K13CC9X 2013 CX129 (arc=23 days, H=20.0 ~339m) from Naef Obs. (March 9.91-94p2)
- K12V93V 2012 VV93 (arc=116 days, H=17.4 ~1.12 km) from Holmes/CTIO (March 9.40-41p4)
- K12TE6J 2012 TJ146 (Q=4.423 AU, arc=149 days, H=20.6 ~257m) from PS1 (March 9.39-40p2)
- K12T53F 2012 TF53 (arc=152 days, H=21.2 ~195m) from Holmes/CTIO (March 9.40-41p4)
- J99H02A 1999 HA2 (Q=4.744 AU, arc=4 opp, H=17.8 ~933m) from Mirasteilas Obs. (March 10.12-13p3)
- R6732 276732 2004 EV9 from Andrushivka Obs. (March 5.95-98p3)
- D7199 137199 1999 KX4 from Mirasteilas Obs. (March 8.14-15p3)
- 02101 2101 Adonis (1936 CA) from Calar Alto Obs. (March 9.02-06p3)
Observers on 10 March '13
Ten observers appear in today's MPECs.
|Code||Observer / observatory|
|A50||Andrushivka Obs. in the Ukraine, 1 in MPEC 2013-E43 -- 276732|
|493||Calar Alto Obs. in Spain, 1 in MPEC 2013-E43 -- 2101|
|807|||Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2013-E43 & 2013-E44 -- 2013 EM20, 2013 EK28, 2012 VV93, 2012 TF53|
|H75||Indian Hill North Obs. in Ohio, 1 in MPEC 2013-E43 -- 2013 EC28|
|B67||Mirasteilas Obs. in Switzerland, 2 in MPEC 2013-E43 -- 1999 HA2, 137199|
|A13||Naef Obs. in Switzerland, 2 in MPEC 2013-E43 -- 2013 CX129, 68278|
|F51||Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2013-E43, 2013-E44 & 2013-E45 -- 2013 EL28, 2013 EK28, 2012 TJ146, 136617|
|204||Schiaparelli Obs. in Italy, 1 in MPEC 2013-E45 -- 2013 EL28|
|I93||St. Pardon de Conques Obs. in France, 1 in MPEC 2013-E45 -- 2013 EL28|
|J08||Zonalunar Obs. in Spain, 1 in MPEC 2013-E43 -- 2013 ET|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 10 March '13
Notes for Today's Latest Risk Assessments
|2013 EL28||JPL Sentry||1627||2018-2110||53||4.0e-08||-5.90||-6.03||0||JPL: "Analysis based on 8 observations spanning 1.5801 days (2013-Mar-08.60533 to 2013-Mar-10.1854)." Diameter approximately 0.110 km. from mean, weighted H=22.4.|
|2013 ED28||NEODyS||1627||2019-2040||12||8.05e-06||-2.69||-3.29||0||NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2013-03-07.218 to 2013-03-09.061."|
|JPL Sentry||0057||2019-2110||49||1.3e-05||-2.43||-2.86||0||JPL: "Analysis based on 21 observations spanning 1.8427 days (2013-Mar-07.21735 to 2013-Mar-09.060005)." Diameter approximately 0.172 km. from mean, weighted H=21.5.|
|2013 EV27||NEODyS||1627||2038-2102||11||1.46e-05||-5.56||-5.64||0||NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2013-03-05.417 to 2013-03-09.186."|
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 10 March '13
Times are UTC for when items were noted or added by The Tracking News.
|1629||Generated Traffic Report|
|1627||Noted that NEODyS has posted 2013 ED28 as an impact risk - see above|
Noted that JPL Sentry has posted 2013 EL28 as an impact risk - see above
Noted that NEODyS has posted 2013 EV27 as an impact risk - see above
Grabbed MPEC 2013-E43 - Daily Orbit Update - see above
Grabbed MPEC 2013-E44 - 2013 EK28 - see above
Grabbed MPEC 2013-E45 - 2013 EL28 - see above
|0057||Noted that JPL Sentry has posted 2013 ED28 as an impact risk - see above|