Contents on 6 April '12
- Traffic Report -- four objects
- IAU Minor Planet Center
- Observers -- four observers
- Impact Risk Monitoring -- one object
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page (archive)
Of 455 risk-listed objects, 27 have had news in the last 31 days. Updated at 1636 UTC on 6 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 28 March
- 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 6 April '12
Four objects reported inside ten LD
Four objects are reported traveling inside ten lunar distances (LD) of Earth today. 2012 FA57 exits Earth's Hill sphere, moving from 2.53 to 4.47 LD. More distantly, 2012 FH58 is outbound from 5.87 to 7.70 LD and intruder 2012 FS35 from 8.00 to 8.77 LD, and radar target intruder 2012 EG5 departs from inside ten LD, passing from 8.68 to 10.56 LD.
Coming our way next, risk-listed 2012 GD arrives inside ten LD on April 8th and 2007 HV4 on April 14th.
This report was posted at 1636 UTC with follow-up from late March in today's DOU MPEC for 2012 FA57, 2012 FX35, 2012 FS35, and 2012 FP35.
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 6 April '12
The MPC's NEO Confirmation Page has 18 listings
When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen objects listed. Of these, three were "one nighters." So far The Tracking News has counted a total of 25 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 6 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
- K12F57A 2012 FA57 (small asteroid, Q=4.047 AU, arc=6 days, H=26.0 ~21m, close passer) from Schwarzschild Obs. (March 28.83-85p2)
- Observations of close-passing objects
- K12F35X 2012 FX35 (arc=4 days, H=25.8 ~23m, PMD candidate) from Schwarzschild Obs. (March 25.82-83p2)
- K12F35S 2012 FS35 (arc=1 day, H=30.2 ~3m) from Schwarzschild Obs. (March 25.79-81p2)
- K12F35P 2012 FP35 (arc=2 days, H=27.9 ~9m) from Schwarzschild Obs. (March 25.84p2)
- Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
- K12F35Q 2012 FQ35 (arc=9 days, H=23.6 ~65m) from Schwarzschild Obs. (March 24.77p2)
- K12F23T 2012 FT23 (arc=1 day, H=24.2 ~49m) from Schwarzschild Obs. (March 23.90-94p2)
- K12F00F 2012 FF (arc=1 day, H=24.0 ~54m) from Schwarzschild Obs. (March 16.95-99p2)
- K12E14V 2012 EV14 (arc=9 days, H=23.0 ~85m) from Schwarzschild Obs. (March 17.01-04p2)
- K12E10Q 2012 EQ10 (arc=11 days, H=25.9 ~22m) from Schwarzschild Obs. (March 15.99-01p2)
- K12F35R 2012 FR35 (arc=9 days, H=21.8 ~148m) from Schwarzschild Obs. (March 25.78-79p2)
- Observations of other asteroidal objects
- K12F44Z 2012 FZ44 (arc=8 days, H=20.6 ~257m) from Schwarzschild Obs. (March 26.87-88p2)
- K12F23Z 2012 FZ23 (i=75.5°, Q=4.099 AU, arc=13 days, H=18.2 ~776m) from Bigmuskie Obs. (April 5.80-83p3)
- K12E14S 2012 ES14 (Q=4.223 AU, arc=19 days, H=20.3 ~295m) from Schwarzschild Obs. (March 16.01-02p2)
- K12D75X 2012 DX75 (arc=34 days, H=20.3 ~295m) from Cordell-Lorenz Obs. (April 2.30-34p4)
- K11X01E 2011 XE1 (arc=124 days, H=18.2 ~776m) from Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (April 4.98-99p3)
- K11Q48D 2011 QD48 (arc=2 opp, H=18.2 ~776m) from Bigmuskie Obs. (April 5.85-86p3)
- K08Y30T 2008 YT30 (arc=3 opp, H=19.4 ~446m) from Holmes/CTIO (April 4.98p2)
- K08X03E 2008 XE3 (Q=4.045 AU, arc=4 opp, H=16.3 ~1.86 km) from Holmes/CTIO (April 5.41p2)
- K05B00C 2005 BC (arc=3 opp, H=17.9 ~891m) from Holmes/CTIO (April 5.40-42p3)
- K02Q07C 2002 QC7 (arc=3 opp, H=20.0 ~339m) from Holmes/CTIO (April 4.98-99p3)
- K01O14A 2001 OA14 (arc=6 opp, H=18.4 ~708m) from Holmes/CTIO (April 2.98-99p4 & 4.98p2)
Observers on 6 April '12
Four observers appear in today's MPEC.
|Code||Observer / observatory|
|B88||Bigmuskie Obs. in Italy, 2 in MPEC 2012-G23 -- 2012 FZ23, 2011 QD48|
|807|||Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2012-G23 -- 2011 XE1, 2008 YT30, 2008 XE3, 2005 BC, 2002 QC7, 2001 OA14|
|850||Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2012-G23 -- 2012 DX75|
|033||Schwarzschild Obs. in Germany, 12 in MPEC 2012-G23 -- 2012 FZ44, 2012 FX35, 2012 FT23, 2012 FS35, 2012 FR35, 2012 FQ35, 2012 FP35, 2012 FF, 2012 FA57, 2012 EV14, 2012 ES14, 2012 EQ10|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 6 April '12
Notes for Today's Latest Risk Assessments
|2012 FA57||JPL Sentry||1631||R E M O V E D||JPL: Risk listing removed at 0850 UTC.|
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.