Contents on 22 December '12
- Traffic Report -- three objects
- IAU Minor Planet Center
- Observers -- thirteen observers
- Impact Risk Monitoring -- two objects
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page (archive)
Of 475 risk-listed objects, 30 have had news in the last 31 days. Updated at 1659 UTC on 22 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 17 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 22 December '12
Three objects reported inside ten LD
There are three objects reported within ten lunar distances (LD) of our planet today. Inside Earth's Hill sphere, radar target 2012 XM55 is inbound from 3.26 to 3.10 LD. Further away, radar target intruder 2012 XB112 is outbound from 7.04 to 7.99 LD and risk-listed 2012 YR1 from 7.65 to 9.02 LD.
Coming to the neighborhood next, 2012 YS1 arrives inside ten LD tomorrow and 2012 XP55 arrives on December 26th.
This report was generated at 1659 UTC with follow-up in today's DOU MPEC for 2012 XP55 and departed objects 2012 XK134, 2012 XT111, and 2012 XL16.
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 22 December '12
The MPC's NEO Confirmation Page has 33 listings
When last checked at 2352 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 33 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 34 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 22 December '12
Minor Planet Electronic Circulars
As of last check at 2352 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
- K12XD4K 2012 XK134 (small asteroid, arc=8 days, H=26.4 ~18m, close passer) from Magdalena Ridge Obs. (MRO) (Dec. 21.25-28p5)
- K12XD3E 2012 XE133 (small asteroid, arc=9 days, H=23.5 ~68m) from ESA Optical Ground Station (ESA OGS) (Dec. 15.07p3) and MRO (Dec. 21.24-27p4)
- Observations of recently (no longer) risk-listed objects
- K12XD4M 2012 XM134 (small asteroid, Q=5.749 AU, arc=5 days, H=22.6 ~102m) from ESA OGS (Dec. 16.86p3)
- K12XD3F 2012 XF133 (small asteroid, arc=6 days, H=22.1 ~129m) from ESA OGS (Dec. 15.05-07p3)
- Observations of close-passing objects
- K12XB1T 2012 XT111 (arc=7 days, H=25.4 ~28m) from ESA OGS (Dec. 14.06-07p2 & 16.91-92p2)
- K12X55P 2012 XP55 (arc=13 days, H=23.9 ~56m) from the Catalina Sky Survey (CSS) (Dec. 21.25-27p3)
- K12X16L 2012 XL16 (arc=11 days, H=25.4 ~28m) from ESA OGS (Dec. 16.87-88p3)
- Observation campaigns (radar support, potential mission destinations)
- J94X00D 1994 XD (Q=4.072 AU, arc=2 opp, H=19.1 ~513m, radar) from Kourovskaya Obs. (Dec. 13.98p2 & 14.03p2)
- 04179 4179 Toutatis (1989 AC) (radar) from Vicksburg Obs. (Dec. 13.04p4), Kourovskaya Obs. (Dec. 13.84-87p3), Wickede Obs. (Dec. 19.85-89p5), and Pear Tree Obs. (Dec. 21.10-13p3)
-- Planetary radar schedules: Arecibo & Goldstone
- Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
- K12XD3C 2012 XC133 (arc=8 days, H=22.3 ~117m) from ESA OGS (Dec. 16.88-89p3)
- K12XB1R 2012 XR111 (arc=11 days, H=24.9 ~35m) from ESA OGS (Dec. 16.85p3) and the Spacewatch 1.8m telescope (Dec. 21.39-40p3)
- K12XB1Q 2012 XQ111 (arc=11 days, H=23.8 ~59m) from Spacewatch 1.8m (Dec. 21.34-36p3)
- K12XB1P 2012 XP111 (arc=11 days, H=23.6 ~65m) from ESA OGS (Dec. 16.90-91p3) and Spacewatch 1.8m (Dec. 21.40p2)
- K12X00G 2012 XG (arc=18 days, H=23.9 ~56m) from Spacewatch 1.8m (Dec. 21.29-31p3)
- K12W25C 2012 WC25 (arc=27 days, H=22.6 ~102m) from Spacewatch 1.8m (Dec. 21.37-38p3)
- K12XB1S 2012 XS111 (arc=11 days, H=22.0 ~135m) from Spacewatch 1.8m (Dec. 21.28p3)
- Observations of other asteroidal objects
- K12XD4R 2012 XR134 (arc=11 days, H=18.4 ~708m) from Spacewatch 1.8m (Dec. 21.24-26p3)
- K12XB2D 2012 XD112 (arc=11 days, H=21.1 ~204m) from Spacewatch 1.8m (Dec. 21.54p3)
- K12XB2C 2012 XC112 (arc=10 days, H=19.3 ~467m) from Vicksburg Obs. (Dec. 11.13-15p4)
- K12X93S 2012 XS93 (q=0.302 AU, arc=13 days, H=19.7 ~389m) from Spacewatch 1.8m (Dec. 21.53-54p3)
- K12W25B 2012 WB25 (arc=29 days, H=19.0 ~537m) from Spacewatch 1.8m (Dec. 21.36p3)
- K12T79A 2012 TA79 (arc=72 days, H=18.6 ~645m) from CSS (Dec. 21.28-30p4)
- K12Q49F 2012 QF49 (arc=2 opp, H=17.4 ~1.12 km) from Kourovskaya Obs. (Dec. 13.85p3)
- K12F62S 2012 FS62 (arc=2 opp, H=20.2 ~309m) from LINEAR (Dec. 21.43-49p4)
- K10Q02D 2010 QD2 (arc=4 opp, H=17.3 ~1.17 km) from ISON-NM Obs. (Dec. 21.46-51p3)
- K06O15F 2006 OF15 (arc=4 opp, H=18.4 ~708m) from the Mt. Lemmon Survey (MLS) (Dec. 21.50-52p8 at V=20.7-22.5)
- K04Y05C 2004 YC5 (arc=4 opp, H=18.1 ~812m) from LINEAR (Dec. 21.07-13p5)
- K01Y02M 2001 YM2 (arc=2 opp, H=19.5 ~426m) from Kourovskaya Obs. (Dec. 13.93p2 & 14.01-02p2) and MLS (Dec. 21.33-35p4)
- Y5705 345705 2006 VB14 from Kourovskaya Obs. (Dec. 13.88p2 & 13.92-93p2)
- R7127 277127 2005 GW119 from Kourovskaya Obs. (Dec. 13.91-94p4)
- J2563 192563 1998 WZ6 from Kourovskaya Obs. (Dec. 13.96p1 & 14.02-03p2) and El Maestrat Obs. (Dec. 21.80-84p8)
- J0161 190161 2005 TJ174 from MLS (Dec. 21.50-51p8)
- H7651 177651 2004 XM14 from LINEAR (Dec. 21.46-48p3)
- F9533 159533 2001 HH31 from CSS (Dec. 21.31-33p4)
- F3220 153220 2000 YN29 from MLS (Dec. 21.24-25p4)
- F2742 152742 1998 XE12 from CSS (Dec. 21.28-30p4)
- D7199 137199 1999 KX4 from MLS (Dec. 21.48-49p4)
- D7052 137052 Tjelvar (1998 VO33) from CSS (Dec. 21.25-27p4)
- 85490 85490 1997 SE5 from MLS (Dec. 21.43-45p4)
- 68548 68548 2001 XR31 from LINEAR (Dec. 21.35-36p2 & 21.41p1)
- 11405 11405 1999 CV3 from Pan-STARRS 1 (PS1) (Dec. 21.47-51p3)
- 05646 5646 1990 TR from El Maestrat Obs. (Dec. 21.77-79p5)
Observers on 22 December '12
Thirteen observers appear in today's MPEC.
|Code||Observer / observatory|
|703||Catalina Sky Survey (CSS) in Arizona, 5 in MPEC 2012-Y19 -- 2012 XP55, 2012 TA79, 159533, 152742, 137052|
|J04||ESA Optical Ground Station (ESA OGS) in the Canary Islands, 8 in MPEC 2012-Y19 -- 2012 XT111, 2012 XR111, 2012 XP111, 2012 XM134, 2012 XL16, 2012 XF133, 2012 XE133, 2012 XC133|
|J19||El Maestrat Obs. in Spain, 2 in MPEC 2012-Y19 -- 192563, 5646|
|H15||ISON-NM Obs. in New Mexico, 1 in MPEC 2012-Y19 -- 2010 QD2|
|168||Kourovskaya Obs. in Russia, 7 in MPEC 2012-Y19 -- 2012 QF49, 2001 YM2, 1994 XD, 345705, 277127, 192563, 4179|
|704||LINEAR in New Mexico, 4 in MPEC 2012-Y19 -- 2012 FS62, 2004 YC5, 68548, 177651|
|H01||Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPEC 2012-Y19 -- 2012 XK134, 2012 XE133|
|G96||Mt. Lemmon Survey (MLS) in Arizona, 6 in MPEC 2012-Y19 -- 2006 OF15, 2001 YM2, 85490, 190161, 153220, 137199|
|F51||Pan-STARRS 1 in Hawaii, 1 in MPEC 2012-Y19 -- 11405|
|H23||Pear Tree Obs. in Florida, 1 in MPEC 2012-Y19 -- 4179|
|291||Spacewatch 1.8m telescope in Arizona, 10 in MPEC 2012-Y19 -- 2012 XS93, 2012 XS111, 2012 XR134, 2012 XR111, 2012 XQ111, 2012 XP111, 2012 XG, 2012 XD112, 2012 WC25, 2012 WB25|
|H47||Vicksburg Obs. in Mississippi, 2 in MPEC 2012-Y19 -- 2012 XC112, 4179|
|G33||Wickede Obs., 1 in MPEC 2012-Y19 -- 4179|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 22 December '12
Notes for Today's Latest Risk Assessments
|2012 XK134||NEODyS||1656||2096-2096||1||1.5e-08||-8.92||-8.92||0||NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2012-12-13.147 to 2012-12-21.278."|
|2012 XE133||JPL Sentry||1656||2083-2104||5||7.7e-08||-6.62||-7.02||0||JPL: "Analysis based on 78 observations spanning 8.8349 days (2012-Dec-12.43361 to 2012-Dec-21.26854)." Diameter approximately 0.068 km. from mean, weighted H=23.5.|
|NEODyS||1656||2083-2091||2||2.42e-08||-7.11||-7.39||0||NEODyS: "Based on 78 optical observations (of which 0 are rejected as outliers) from 2012-12-12.434 to 2012-12-21.269."|
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 22 December '12
Times are UTC for when items were noted or added by The Tracking News.
|1659||Generated Traffic Report|
|1656||Noted that JPL Sentry has updated its 2012 XE133 risk assessment - see above|
Noted that NEODyS has updated its 2012 XE133 risk assessment - see above
Noted that NEODyS has updated its 2012 XK134 risk assessment - see above
Grabbed MPEC 2012-Y19 - Daily Orbit Update - see above