Contents on 20 December '12
- Traffic Report -- five objects
- IAU Minor Planet Center
- Observers -- fifteen observers
- Impact Risk Monitoring -- one object
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page (archive)
Of 476 risk-listed objects, 31 have had news in the last 31 days. Updated at 1552 UTC on 20 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 20 December '12
Five objects reported inside ten LD
Five objects are reported to be inside ten lunar distances (LD) of Earth today. Radar target 2012 XM55 enters Earth's Hill sphere, flying from 3.90 to 3.54 LD. Out further, radar target intruder 2012 XB112 is outbound from 5.17 to 6.10 LD and the other three exit the ten LD "bubble." 2012 XP134 passes from 8.75 to 10.71 LD, risk-listed 2012 XM16 from 9.68 to 12.48 LD, and intruder 2012 XL134 from 9.72 to 11.94 LD.
Coming our way next, 2012 XP55 arrives inside ten LD on December 26th.
This report was generated at 1553 UTC with follow-up in today's DOU MPEC for 2012 XM55.
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 20 December '12
The MPC's NEO Confirmation Page has 11 listings
When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eleven objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of sixteen 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 20 December '12
Minor Planet Electronic Circulars
As of last check at 2359 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2012-Y10 time-stamped "06:04 UT" - Daily Orbit Update - see below
- MPEC 2012-Y11 time-stamped "15:28 UT" - 2012 YN1 - see below
- MPEC 2012-Y12 time-stamped "15:35 UT" - 2012 YO1
MPEC 2012-Y12 - "15:35 UT" - 2012 YO1
- K12Y01O 2012 YO1 (H=21.3 ~186m) from LINEAR (Dec. 18.06-12p5), Ceccano Obs. (Dec. 19.82p3), Volta Obs. (Dec. 19.86-87p5), Schiaparelli Obs. (Dec. 19.91-92p5), and Desert Moon Obs. (Dec. 20.16-18p5)
MPEC 2012-Y11 - "15:28 UT" - 2012 YN1
- K12Y01N 2012 YN1 (small asteroid, H=23.6 ~65m) from ESA Optical Ground Station (ESA OGS) (Dec. 16.99-02p4), Magdalena Ridge Obs. (MRO) (Dec. 18.23-25p4), Schiaparelli Obs. (Dec. 19.15-18p3), and the Spacewatch 1.8m telescope (Dec. 20.48-49p3)
- Observations of risk-listed objects
- K12XD3E 2012 XE133 (small asteroid, arc=8 days, H=23.5 ~68m) from Spacewatch 1.8m (Dec. 20.18p3)
- 99942 99942 Apophis (2004 MN4) (PMD, radar support) from Majdanak Obs. (Dec. 14.00-07p46)
- Observations of close-passing objects
- K12X55M 2012 XM55 (arc=12 days, H=27.9 ~9m, radar support) from Schiaparelli Obs. (Dec. 20.00-02p2)
- Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
- K12XD3C 2012 XC133 (arc=8 days, H=22.3 ~117m) from Spacewatch 1.8m (Dec. 20.23-24p3)
- K12XD2Z 2012 XZ132 (arc=11 days, H=24.6 ~41m) from Spacewatch 1.8m (Dec. 20.22p3)
- K02X40Q 2002 XQ40 (arc=4 opp, H=22.4 ~112m) from program code "`" (30) using the Palomar Digitized Sky Survey (Palomar DSS) (1954 Dec. 22.37p2)
- K12V05A 2012 VA5 (Q=4.184 AU, arc=46 days, H=21.8 ~148m) from Astronomical Research Obs. Westfield (Dec. 19.03-04p3)
- Observations of other asteroidal objects
- K12XE5M 2012 XM145 (arc=6 days, H=20.4 ~282m) from ARO Westfield (Dec. 19.04-06p3)
- K12XD3A 2012 XA133 (arc=9 days, H=20.8 ~234m) from Spacewatch 1.8m (Dec. 20.20p3)
- K12XB2F 2012 XF112 (Q=5.241 AU, arc=10 days, H=19.8 ~371m) from Wishing Star Obs. (Dec. 20.18-21p3)
- K12X93Q 2012 XQ93 (arc=10 days, H=21.5 ~170m) from LINEAR (Dec. 18.19-23p4)
- K12X55J 2012 XJ55 (arc=88 days, H=21.7 ~155m) from ARO Westfield (Dec. 19.07-08p3)
- K12X55H 2012 XH55 (arc=13 days, H=19.0 ~537m) from Spacewatch 1.8m (Dec. 20.21p3)
- K12X55C 2012 XC55 (arc=12 days, H=19.4 ~446m) from LINEAR (Dec. 18.39-45p5)
- K12X17E 2012 XE17 (arc=14 days, H=20.1 ~323m) from ARO Westfield (Dec. 19.05-06p5)
- K12X16G 2012 XG16 (arc=16 days, H=21.5 ~170m) from Spacewatch 1.8m (Dec. 20.18-19p2)
- K12W03P 2012 WP3 (arc=2 opp, H=17.5 ~1.07 km) from LINEAR (Dec. 18.26-32p5)
- K12V37F 2012 VF37 (Q=4.060 AU, arc=42 days, H=21.0 ~214m) from ARO Westfield (Dec. 19.09-10p6)
- K12UD6S 2012 US136 (i=51.8°, q=0.380 AU, Q=8.223 AU, arc=59 days, H=15.9 ~2.24 km) from ARO Westfield (Dec. 18.99-01p5)
- K12TE6J 2012 TJ146 (Q=4.420 AU, arc=69 days, H=20.6 ~257m) from ARO Westfield (Dec. 19.02-03p5)
- K12T78Q 2012 TQ78 (arc=74 days, H=19.5 ~426m) from ARO Westfield (Dec. 19.02-03p3)
- K12S51F 2012 SF51 (Q=4.223 AU, arc=7 opp, H=15.4 ~2.82 km, q=0.781 AU) from the Sloan Digital Sky Survey (SDSS) (2004 Oct. 10.25p4)
- K12J17T 2012 JT17 (Q=4.004 AU, arc=218 days, H=18.5 ~676m) from ARO Westfield (Dec. 19.00-01p3)
- K08Y28Z 2008 YZ28 (Q=4.049 AU, arc=2 opp, H=19.9 ~355m) from LINEAR (Dec. 18.33-38p5)
- Y5705 345705 2006 VB14 from ARO Westfield (Dec. 19.09-10p6)
- X1509 331509 1999 YA from LINEAR (Dec. 18.27-32p5)
- S5110 285110 1995 MA1 from LINEAR (Dec. 18.07-12p5)
- R7127 277127 2005 GW119 from Oukaimeden Obs. (Dec. 17.96-02p4 & 18.96-01p4)
- L4869 214869 2007 PA8 from LINEAR (Dec. 18.46-52p5)
- K3471 203471 2002 AU4 from LINEAR (Dec. 18.34-39p5)
- D8937 138937 2001 BK16 from Geyserland Obs. (Dec. 19.40-41p2)
- 11405 11405 1999 CV3 from LINEAR (Dec. 18.33-39p5)
- 06569 6569 Ondaatje (1993 MO) from LINEAR (Dec. 18.14-19p5)
Observers on 20 December '12
Fifteen observers appear in today's MPECs.
|Code||Observer / observatory|
|H21||Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2012-Y10 -- 2012 XM145, 2012 XJ55, 2012 XE17, 2012 VF37, 2012 VA5, 2012 US136, 2012 TQ78, 2012 TJ146, 2012 JT17, 345705|
|470||Ceccano Obs. in Italy, 1 in MPEC 2012-Y12 -- 2012 YO1|
|448||Desert Moon Obs. in New Mexico, 1 in MPEC 2012-Y12 -- 2012 YO1|
|J04||ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2012-Y11 -- 2012 YN1|
|E89||Geyserland Obs. in New Zealand, 1 in MPEC 2012-Y10 -- 138937|
|704||LINEAR in New Mexico, 11 in MPECs 2012-Y10 & 2012-Y12 -- 2012 YO1, 2012 XQ93, 2012 XC55, 2012 WP3, 2008 YZ28, 331509, 285110, 214869, 203471, 11405, 6569|
|H01||Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2012-Y11 -- 2012 YN1|
|188||Majdanak Obs. in Uzbekistan, 1 in MPEC 2012-Y10 -- 99942|
|J43||Oukaimeden Obs. in Morocco, 1 in MPEC 2012-Y10 -- 277127|
|261`||program code "`" (30) using the Palomar Digitized Sky Survey in southern California, 1 in MPEC 2012-Y10 -- 2002 XQ40|
|204||Schiaparelli Obs. in Italy, 3 in MPECs 2012-Y10, 2012-Y11 & 2012-Y12 -- 2012 YO1, 2012 YN1, 2012 XM55|
|645||Sloan Digital Sky Survey in New Mexico, 1 in MPEC 2012-Y10 -- 2012 SF51|
|291||Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2012-Y10 & 2012-Y11 -- 2012 YN1, 2012 XZ132, 2012 XH55, 2012 XG16, 2012 XE133, 2012 XC133, 2012 XA133|
|C44||Volta Obs. in Italy, 1 in MPEC 2012-Y12 -- 2012 YO1|
|I15||Wishing Star Obs. in Rhode Island, 1 in MPEC 2012-Y10 -- 2012 XF112|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 20 December '12
Notes for Today's Latest Risk Assessments
|2012 XE133||JPL Sentry||1551||2083-2091||3||4.6e-08||-6.85||-7.18||0||JPL: "Analysis based on 71 observations spanning 7.7455 days (2012-Dec-12.43361 to 2012-Dec-20.17914)." Diameter approximately 0.067 km. from mean, weighted H=23.5.|
|NEODyS||1551||2083-2093||3||1.61e-08||-7.30||-7.58||0||NEODyS: "Based on 71 optical observations (of which 0 are rejected as outliers) from 2012-12-12.434 to 2012-12-20.180."|
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 20 December '12
Times are UTC for when items were noted or added by The Tracking News.
|1553||Generated Traffic Report|
|1551||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
Grabbed MPEC 2012-Y10 - Daily Orbit Update - see above
Grabbed MPEC 2012-Y11 - 2012 YN1 - see above
Grabbed MPEC 2012-Y12 - 2012 YO1 - see above