Contents on 7 April '12
- Traffic Report -- three objects
- IAU Minor Planet Center
- Observers -- three observers
- Impact Risk Monitoring -- one object
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page (archive)
Of 454 risk-listed objects, 26 have had news in the last 31 days. Updated at 1500 UTC on 7 April.
- 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 7 April
- 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 7 April '12
Three objects reported inside ten LD
Three visitors are reported traveling inside ten lunar distances (LD) of Earth today. 2012 FA57 is outbound from 4.47 to 6.48 LD, 2012 FH58 from 7.70 to 9.68 LD, and intruder 2012 FS35 from 8.77 to 9.54 LD. Now approaching our neighborhood, risk-listed 2012 GD arrives inside ten LD tomorrow and 2007 HV4 comes inside on April 14th.
This report was posted at 1502 UTC with follow-up in today's DOU MPEC for 2012 GD.
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 7 April '12
The MPC's NEO Confirmation Page has 2 listings
When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two objects listed. 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 7 April '12
Minor Planet Electronic Circulars
As of last check at 2359 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- Observations of risk-listed objects
- K12G00D 2012 GD (small asteroid, arc=5 days, H=26.9 ~14m, close passer) from Astronomical Research Obs. Westfield (April 6.28-29p3)
- Observation campaigns (radar support, potential mission destinations)
- E1018 141018 2001 WC47 (PMD, radar) from Sandlot Obs. (April 6.21p1, 6.25p1 & 6.30p1)
-- Potential mission destinations list & ephemerides + NHATS -- Planetary radar schedules: Arecibo & Goldstone
- Observations of almost-small asteroids (21.7<H<=22.0)
- K12F58G 2012 FG58 (arc=9 days, H=21.8 ~148m) from ARO Westfield (April 6.32-33p3) and Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (April 6.41-42p3)
- K12F35R 2012 FR35 (arc=13 days, H=21.8 ~148m) from ARO Westfield (April 6.17-18p3)
- Observations of other asteroidal objects
- K12F62R 2012 FR62 (i=39.5°, arc=8 days, H=19.0 ~537m) from ARO Westfield (April 6.34-35p3)
- K12F57B 2012 FB57 (arc=9 days, H=19.5 ~426m) from ARO Westfield (April 6.08-09p3)
- K12F52N 2012 FN52 (arc=11 days, H=17.9 ~891m) from ARO Westfield (April 6.36-37p3)
- K12F00J 2012 FJ (i=40.1°, arc=21 days, H=18.9 ~562m) from ARO Westfield (April 6.37-38p3)
- K12A11A 2012 AA11 (arc=83 days, H=20.1 ~323m) from ARO Westfield (April 6.19-20p5)
- K11X03O 2011 XO3 (Q=5.385 AU, arc=127 days, H=16.6 ~1.62 km) from ARO Westfield (April 6.11-12p3)
- K11SA2L 2011 SL102 (arc=3 opp, H=18.2 ~776m) from ARO Westfield (April 6.16-17p3)
- K11Q48D 2011 QD48 (arc=2 opp, H=18.2 ~776m) from Holmes/CTIO (April 5.98-99p3) and ARO Westfield (April 6.10-11p4)
- K04Q07J 2004 QJ7 (arc=3 opp, H=18.5 ~676m) from ARO Westfield (April 6.10-12p3)
Observers on 7 April '12
Three observers appear in today's MPEC.
|Code||Observer / observatory|
|H21||Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2012-G24 -- 2012 GD, 2012 FR62, 2012 FR35, 2012 FN52, 2012 FJ, 2012 FG58, 2012 FB57, 2012 AA11, 2011 XO3, 2011 SL102, 2011 QD48, 2004 QJ7|
|807|||Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2012-G24 -- 2012 FG58, 2011 QD48|
|H36||Sandlot Obs. in Kansas, 1 in MPEC 2012-G24 -- 141018|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 7 April '12
Notes for Today's Latest Risk Assessments
|2012 GD||JPL Sentry||1500||2036||1||6.0e-10||-9.91||-9.91||0||JPL: "Analysis based on 17 observations spanning 4.9485 days (2012-Apr-01.34437 to 2012-Apr-06.292896)." Diameter approximately 0.014 km. from mean, weighted H=26.9.|
|NEODyS||1500||2067-2067||1||1.34e-10||-10.95||-10.95||0||NEODyS: "Based on 18 optical observations (of which 1 are rejected as outliers) from 2012-04-01.345 to 2012-04-06.294."|
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 7 April '12
Times are UTC for when items were noted or added by The Tracking News.
|1502||Generated Traffic Report|
|1500||Noted that JPL Sentry has updated its 2012 GD risk assessment - see above|
Noted that NEODyS has updated its 2012 GD risk assessment - see above
Grabbed MPEC 2012-G24 - Daily Orbit Update - see above