Contents on 24 December '12
- Traffic Report -- three objects
- IAU Minor Planet Center
- Observers -- ten observers
- Impact Risk Monitoring -- one object
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page (archive)
Of 475 risk-listed objects, 28 have had news in the last 31 days. Updated at 1602 UTC on 24 Dec.
- 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 23 Dec.
- 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 24 December '12
Three objects reported inside ten LD
There are three objects reported inside ten lunar distances (LD) of our planet today. Within Earth's Hill sphere, radar target 2012 XM55 is outbound from 3.05 to 3.13 LD. Further out, 2012 YS1 comes its closest to Earth on this passage, reaching 8.15 LD at 1142 UT, and radar target intruder 2012 XB112 is outbound from 8.94 to 9.90 LD.
Headed our way next, 2012 XP55 arrives inside ten LD on December 26th.
This report was generated at 1604 UTC with follow-up in today's DOU MPEC for 2012 XP55.
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 24 December '12
The MPC's NEO Confirmation Page has 55 listings
When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 55 objects listed. Of these, 39 were "one nighters." So far The Tracking News has counted a total of 61 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 24 December '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
- K12Y01Q 2012 YQ1 (arc=4 days, H=21.0 ~214m) from Elena Remote Obs. (Dec. 23.26p2)
- Observations of recently (no longer) risk-listed objects
- K12XD4T 2012 XT134 (i=60.2°, arc=11 days, H=18.8 ~589m) from Astronomical Research Obs. Westfield (Dec. 22.31-33p4)
- K12XD4M 2012 XM134 (small asteroid, Q=5.633 AU, arc=9 days, H=22.6 ~102m) from ARO Westfield (Dec. 22.25-27p4)
- K12X06Y 2012 XY6 (arc=19 days, H=19.0 ~537m) from ARO Westfield (Dec. 22.15-17p4)
- Observations of close-passing objects
- K12X55P 2012 XP55 (arc=14 days, H=23.9 ~56m) from ARO Westfield (Dec. 22.14-15p4)
- Observation campaigns (radar support, potential mission destinations)
- 04179 4179 Toutatis (1989 AC) (radar) from Bisei Spaceguard Center (Dec. 23.64-65p4)
-- Planetary radar schedules: Arecibo & Goldstone
- Observations of small asteroids (H>22.0)
- K12Y00K 2012 YK (arc=5 days, H=22.9 ~89m) from ARO Westfield (Dec. 22.11-12p4)
- K12XB1P 2012 XP111 (arc=12 days, H=23.5 ~68m) from ARO Westfield (Dec. 22.18-19p3)
- K12W10Q 2012 WQ10 (arc=23 days, H=22.5 ~107m) from David Tholen's team via Faulkes Telescope North (Dec. 15.26p2)
- K12V77K 2012 VK77 (arc=38 days, H=25.5 ~27m) from ARO Westfield (Dec. 22.32-35p3 at V=22.1-3)
- K12V06P 2012 VP6 (arc=40 days, H=24.2 ~49m) from David Tholen's team on Mauna Kea (Dec. 14.33-34p3 at R=23.2-7)
- Observations of other asteroidal objects
- K12Y01O 2012 YO1 (arc=4 days, H=21.3 ~186m) from ARO Westfield (Dec. 22.09-10p4)
- K12XB2C 2012 XC112 (arc=12 days, H=19.3 ~467m) from Pear Tree Obs. (Dec. 21.06-09p3), Tholen team/Faulkes North (Dec. 21.43p4), and ARO Westfield (Dec. 22.13-14p4)
- K12X93S 2012 XS93 (q=0.301 AU, arc=15 days, H=19.6 ~407m) from Pan-STARRS 1 (PS1) (Dec. 23.56-59p3)
- K12V37F 2012 VF37 (Q=4.060 AU, arc=44 days, H=21.0 ~214m) from Pear Tree Obs. (Dec. 21.02-05p3)
- K12Q49F 2012 QF49 (arc=2 opp, H=17.4 ~1.12 km) from Bisei (Dec. 23.50p5)
- K09B02D 2009 BD2 (arc=2 opp, H=17.6 ~1.02 km) from PS1 (Dec. 22.31-32p2)
- K07B08M 2007 BM8 (q=0.375 AU, arc=6 opp, H=18.3 ~741m) from PS1 (Dec. 22.51-52p2)
- K01Y02M 2001 YM2 (arc=2 opp, H=19.5 ~426m) from Rantiga Obs. (Dec. 16.80-83p4) and Bisei (Dec. 23.47-48p5)
- X7075 337075 1998 QC1 from PS1 (Dec. 23.63-64p3)
- X3358 333358 2001 WN1 from ARO Westfield (Dec. 22.17-18p4)
- X1509 331509 1999 YA from Los Molinos Obs. (Dec. 23.24-25p3)
- M2165 222165 2000 AX93 from PS1 (Dec. 22.29-30p2)
- I9173 189173 2002 XY4 from Los Molinos Obs. (Dec. 23.19-21p5)
- H7614 177614 2004 HK33 from PS1 (Dec. 23.57-61p4)
- G4216 164216 2004 OT11 from PS1 (Dec. 23.57p1 & 23.61p1)
- G3732 163732 2003 KP2 from Los Molinos Obs. (Dec. 23.00-01p4)
- G2825 162825 2001 BO61 from PS1 (Dec. 23.63-64p4)
- F9533 159533 2001 HH31 from PS1 (Dec. 22.51-52p2)
- E1354 141354 2002 AJ29 from PS1 (Dec. 22.37-39p2)
- D8937 138937 2001 BK16 from Los Molinos Obs. (Dec. 23.17-18p5)
- B2985 112985 2002 RS28 from PS1 (Dec. 22.31-32p2)
- 88213 88213 2001 AF2 from Los Molinos Obs. (Dec. 23.05-06p2)
- 68063 68063 2000 YJ66 from PS1 (Dec. 23.63-64p3)
- 26166 26166 1995 QN3 from PS1 (Dec. 23.63-64p4)
- 07350 7350 1993 VA from Vicksburg Obs. (Sept. 20.45-46p3)
- 05646 5646 1990 TR from Vicksburg Obs. (Sept. 20.46-47p3)
- 03838 3838 Epona (1986 WA) from ARO Westfield (Dec. 22.08-09p4)
- 01685 1685 Toro (1948 OA) from PS1 (Dec. 23.63-64p4)
Observers on 24 December '12
Ten observers appear in today's MPEC.
|Code||Observer / observatory|
|H21||Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2012-Y27 -- 2012 YO1, 2012 YK, 2012 XY6, 2012 XT134, 2012 XP55, 2012 XP111, 2012 XM134, 2012 XC112, 2012 VK77, 333358, 3838|
|300||Bisei Spaceguard Center in Japan, 3 in MPEC 2012-Y27 -- 2012 QF49, 2001 YM2, 4179|
|G32||Elena Remote Obs., 1 in MPEC 2012-Y27 -- 2012 YQ1|
|F658||David Tholen's team in Hawaii via Faulkes Telescope North in Hawaii, 2 in MPEC 2012-Y27 -- 2012 XC112, 2012 WQ10|
|844||Los Molinos Obs. in Uruguay, 5 in MPEC 2012-Y27 -- 88213, 331509, 189173, 163732, 138937|
|5682||David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-Y27 -- 2012 VP6|
|F51||Pan-STARRS 1 (PS1) in Hawaii, 14 in MPEC 2012-Y27 -- 2012 XS93, 2009 BD2, 2007 BM8, 68063, 337075, 26166, 222165, 177614, 164216, 162825, 159533, 141354, 112985, 1685|
|H23||Pear Tree Obs. in Florida, 2 in MPEC 2012-Y27 -- 2012 XC112, 2012 VF37|
|D03||Rantiga Obs., 1 in MPEC 2012-Y27 -- 2001 YM2|
|H47||Vicksburg Obs. in Mississippi, 2 in MPEC 2012-Y27 -- 7350, 5646|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 24 December '12
Notes for Today's Latest Risk Assessments
|2012 YQ1||JPL Sentry||1600||2106||1||3.3e-07||-4.78||-4.78||0||JPL: "Analysis based on 34 observations spanning 4.0260 days (2012-Dec-19.23613 to 2012-Dec-23.26216)." Diameter approximately 0.220 km. from mean, weighted H=20.9.|
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.