Contents on 27 December '12
- Traffic Report -- two objects
- IAU Minor Planet Center
- Observers -- five observers
- Impact Risk Monitoring -- one object
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page (archive)
Of 474 risk-listed objects, 26 have had news in the last 31 days. Updated at 1609 UTC on 27 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 27 December '12
Two objects reported inside ten LD
Two visitors are reported flying within ten lunar distances (LD) of our planet today. Radar target 2012 XM55 exits Earth's Hill sphere, traveling from 3.64 to 4.01 LD, and 2012 XP55 comes its closest to Earth on this passage, reaching 9.17 LD at 0945 UT.
No other object is known to come this close until intruder 2012 DA14, a risk-listed radar target, arrives inside ten LD on February 8th.
This report was generated at 1611 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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.
NEOCP Activity on 27 December '12
The MPC's NEO Confirmation Page has 22 listings
When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 22 objects listed. Of these, twelve were "one nighters."
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 27 December '12
Minor Planet Electronic Circulars
As of last check at 2359 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2012-Y32 time-stamped "06:03 UT" - Daily Orbit Update - see below
- MPEC 2012-Y33 time-stamped "20:35 UT" - 2004 UU1
MPEC 2012-Y33 - "20:35 UT" - 2004 UU1
- K04U01U 2004 UU1 (H=21.1 ~204m) from David Tholen's team on Mauna Kea (May 12.31-32p2 at R=23.4 & Dec. 14.21-22p3 at R=22.4-7)
- Observations of risk-listed objects
- K12Y01Q 2012 YQ1 (arc=6 days, H=20.9 ~224m) from Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Dec. 25.27-28p5)
- Observation campaigns (radar support, potential mission destinations)
- J94X00D 1994 XD (Q=4.072 AU, arc=2 opp, H=19.1 ~513m, radar) from New Millennium Obs. (Dec. 11.15p2 & 11.19p2)
-- Planetary radar schedules: Arecibo & Goldstone
- Observations of almost-small asteroids (21.7<H<=22.0)
- K12XB1S 2012 XS111 (arc=11 days, H=22.0 ~135m) from David Tholen's team via Faulkes Telescope North (Dec. 21.44p2)
- Observations of other asteroidal objects
- K12V37F 2012 VF37 (Q=4.061 AU, arc=44 days, H=21.0 ~214m) from New Millennium Obs. (Dec. 11.00-01p4 & 11.09p4)
- K12TL9A 2012 TA219 (Q=4.124 AU, arc=68 days, H=18.1 ~812m) from New Millennium Obs. (Dec. 10.92-97p6)
- K12T79A 2012 TA79 (arc=72 days, H=18.6 ~645m) from New Millennium Obs. (Dec. 11.07-12p4)
- K12S59A 2012 SA59 (Q=4.084 AU, arc=84 days, H=19.0 ~537m) from New Millennium Obs. (Dec. 11.01-10p6)
- K12H01J 2012 HJ1 (arc=2 opp, H=17.9 ~891m) from New Millennium Obs. (Dec. 11.03-11p6)
- K08X02E 2008 XE2 (arc=2 opp, H=19.2 ~490m) from New Millennium Obs. (Dec. 10.94-99p6)
- K01Y02M 2001 YM2 (arc=2 opp, H=19.5 ~426m) from New Millennium Obs. (Dec. 11.05p2 & 11.12p2)
- K00W63L 2000 WL63 (arc=3 opp, H=19.9 ~355m) from New Millennium Obs. (Dec. 11.14p2 & 11.18p2)
- X0825 330825 2008 XE3 from New Millennium Obs. (Dec. 10.95-99p6)
- W9338 329338 2001 JW2 from New Millennium Obs. (Dec. 10.95-99p6)
- R7127 277127 2005 GW119 from New Millennium Obs. (Dec. 11.06p2 & 11.13p2)
- P6412 256412 2007 BT2 from New Millennium Obs. (Dec. 10.96-00p6)
- M2165 222165 2000 AX93 from New Millennium Obs. (Dec. 11.12p2)
- I9173 189173 2002 XY4 from New Millennium Obs. (Dec. 11.17-21p5)
- F9533 159533 2001 HH31 from New Millennium Obs. (Dec. 11.18p4)
- F3958 153958 2002 AM31 from New Millennium Obs. (Dec. 11.15-20p5)
- F2742 152742 1998 XE12 from New Millennium Obs. (Dec. 11.08-10p3)
- E4411 144411 2004 EW9 from New Millennium Obs. (Dec. 4.94p4, 10.93p4 & 10.97-98p3)
- E1052 141052 2001 XR1 from New Millennium Obs. (Dec. 11.05-08p3 & 11.12p1)
- D7052 137052 Tjelvar (1998 VO33) from New Millennium Obs. (Dec. 11.01-04p3 & 11.10p2)
- D6793 136793 1997 AQ18 from program code "\" (26) via La Palma (Dec. 19.24-29p3)
- 68548 68548 2001 XR31 from New Millennium Obs. (Dec. 11.18p4)
- 17188 17188 1999 WC2 from New Millennium Obs. (Dec. 11.14-19p6)
- 17182 17182 1999 VU from New Millennium Obs. (Dec. 4.87p1 & 4.92p4)
- 05646 5646 1990 TR from New Millennium Obs. (Dec. 11.00p2 & 11.09p2)
- 03360 3360 Syrinx (1981 VA) from New Millennium Obs. (Dec. 11.01p2 & 11.09-10p2)
- 03200 3200 Phaethon (1983 TB) from New Millennium Obs. (Dec. 4.93p4, 10.92p4 & 10.96-97p4)
- 02212 2212 Hephaistos (1978 SB) from New Millennium Obs. (Dec. 11.06p1 & 11.13p4)
Observers on 27 December '12
Five observers appear in today's MPECs.
|Code||Observer / observatory|
|807|||Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2012-Y32 -- 2012 YQ1|
|F658||David Tholen's team in Hawaii via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-Y32 -- 2012 XS111|
|950\||program code "\" (26) via La Palma in the Canary Islands, 1 in MPEC 2012-Y32 -- 136793|
|5682||David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-Y33 -- 2004 UU1|
|A24||New Millennium Obs. in Italy, 28 in MPEC 2012-Y32 -- 2012 VF37, 2012 TA79, 2012 TA219, 2012 SA59, 2012 HJ1, 2008 XE2, 2001 YM2, 2000 WL63, 1994 XD, 68548, 330825, 329338, 277127, 256412, 222165, 189173, 17188, 17182, 159533, 153958, 152742, 144411, 141052, 137052, 5646, 3360, 3200, 2212|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 27 December '12
Notes for Today's Latest Risk Assessments
|2012 YQ1||JPL Sentry||1607||2106-2109||2||4.1e-07||-4.68||-4.76||0||JPL: "Analysis based on 39 observations spanning 6.0444 days (2012-Dec-19.23613 to 2012-Dec-25.28052)." Diameter approximately 0.230 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.
Chronology on 27 December '12
Times are UTC for when items were noted or added by The Tracking News.
|2104||Grabbed MPEC 2012-Y33 - 2004 UU1 - see above|
|1611||Generated Traffic Report|
|1607||Noted that JPL Sentry has updated its 2012 YQ1 risk assessment - see above|
Grabbed MPEC 2012-Y32 - Daily Orbit Update - see above