Contents on 20 December '13
- Traffic Report -- one object
- IAU Minor Planet Center
- Observers -- eleven observers
- Impact Risk Monitoring -- three objects
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page (archive)
Of 526 risk-listed objects, 52 have had news in the last 31 days. Updated at 1804 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 - (discontinued)
- 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 '13
One object reported inside ten LD
There is one asteroid reported to be within ten lunar distances (LD) of Earth today. 2013 XH22 leaves our ten-LD reporting "bubble," passing from 6.80 to 11.03 LD.
Next "known" to be approaching is returning 2011 YD29, best calculated to arrive inside ten LD on December 23rd, but with an uncertainty of more than 17 hours.
This report was generated at 1536 UTC with follow-up in today's DOU MPEC for departed 2013 XY8.
Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. 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 '13
The MPC's NEO Confirmation Page has 9 listings
When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nine objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of fourteen 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 '13
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
- K13X22K 2013 XK22 (small asteroid, arc=6 days, H=24.1 ~51m) from Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Dec. 20.35p2)
- Observations of recently (no longer) risk-listed objects
- K13X08Y 2013 XY8 (small asteroid, arc=6 days, H=25.0 ~34m, close passer, radar support) from Sormano Obs. (Dec. 10.96p5)
- Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
- K13W44C 2013 WC44 (arc=24 days, H=22.2 ~123m) from Holmes/CTIO (Dec. 20.20-22p3)
- K13T06E 2013 TE6 (arc=77 days, H=21.8 ~148m) from Holmes/CTIO (Dec. 20.19-20p3)
- Observations of other asteroidal objects
- K13X04A 2013 XA4 (Q=4.258 AU, arc=24 days, H=21.5 ~170m) from Eridanus Obs. (Dec. 12.92-96p8)
- K13X03U 2013 XU3 (Q=4.292 AU, arc=17 days, H=21.0 ~214m) from Holmes/CTIO (Dec. 20.15-16p3)
- K13V13D 2013 VD13 (Q=4.459 AU, arc=41 days, H=17.7 ~977m) from Tony Evans via Slooh.com Canary Islands Obs. (Dec. 19.88-92p3)
- K13U04Q 2013 UQ4 (i=145.3°, Q=119.348 AU, arc=58 days, H=12.9 ~8.91 km, q=1.081 AU) from Holmes/CTIO (Dec. 20.09-11p6)
- K13U03R 2013 UR3 (Q=5.098 AU, arc=3 opp, H=17.0 ~1.35 km) from Castelmartini Obs. (Dec. 17.88p3)
- K13T80B 2013 TB80 (Q=4.358 AU, arc=71 days, H=17.5 ~1.07 km) from Purple Mtn. Obs. Xuyi Station (Dec. 19.50-54p3)
- K13S19K 2013 SK19 (arc=90 days, H=18.8 ~589m) from Holmes/CTIO (Dec. 20.17-18p3)
- K13S00F 2013 SF (arc=94 days, H=19.2 ~490m) from Holmes/CTIO (Dec. 20.34-35p3)
- K13Q17G 2013 QG17 (arc=114 days, H=20.4 ~282m) from Holmes/CTIO (Dec. 20.12-13p3)
- K13N23X 2013 NX23 (arc=158 days, H=18.7 ~616m) from Sopot Obs. (Dec. 20.15-16p4)
- K11S05G 2011 SG5 (arc=2 opp, H=18.4 ~708m) from Holmes/CTIO (Dec. 20.26-29p3)
- K11C04Q 2011 CQ4 (arc=3 opp, H=18.3 ~741m) from Astronomical Research Obs. Westfield (Dec. 19.10-11p5 & 19.18p3)
- K10X67Z 2010 XZ67 (arc=2 opp, H=19.6 ~407m) from New Millennium Obs. (Dec. 16.76p2 & 16.81p2) and Castelmartini Obs. (Dec. 17.78p3)
- K07M00G 2007 MG (arc=3 opp, H=20.9 ~224m) from David Tholen's team on Mauna Kea (Sept. 10.43p1 at R=23.1)
- c1906 381906 2010 CL19 from New Millennium Obs. (Dec. 16.77p2 & 16.81p1)
- b7097 377097 2002 WQ4 from ARO Westfield (Dec. 19.09p2)
- b6729 376729 1998 YB8 from ARO Westfield (Dec. 19.07-08p3)
- P1346 251346 2007 SJ from New Millennium Obs. (Dec. 16.77p2 & 16.81-82p2) and Castelmartini Obs. (Dec. 17.74-75p3)
- G3132 163132 2002 CU11 from Holmes/CTIO (Dec. 11.29-30p3 & 20.27-28p3)
- G2566 162566 2000 RJ34 from New Millennium Obs. (Dec. 16.76p2 & 16.80p2)
- 21088 21088 Chelyabinsk (1992 BL2) from New Millennium Obs. (Dec. 16.85-89p4)
- 16834 16834 1997 WU22 from ARO Westfield (Dec. 19.16-17p4)
- 09950 9950 ESA (1990 VB) from ARO Westfield (Dec. 19.12-14p6)
- 01627 1627 Ivar (1929 SH) from TUBITAK Natl. Obs. (TUG) (Aug. 29.03-07p59, 30.06-09p38, Oct. 28.82-84p23, 28.96-98p20, 29.75-78p29 & 30.76-79p30) and ARO Westfield (Dec. 19.05-07p5)
Observers on 20 December '13
Eleven observers appear in today's MPEC.
|Code||Observer / observatory|
|H21||Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2013-Y12 -- 2011 CQ4, 377097, 376729, 16834, 9950, 1627|
|160||Castelmartini Obs. in Italy, 3 in MPEC 2013-Y12 -- 2013 UR3, 2010 XZ67, 251346|
|807|||Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPEC 2013-Y12 -- 2013 XU3, 2013 XK22, 2013 WC44, 2013 UQ4, 2013 TE6, 2013 SK19, 2013 SF, 2013 QG17, 2011 SG5, 163132|
|A27||Eridanus Obs. in Germany, 1 in MPEC 2013-Y12 -- 2013 XA4|
|5682||David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-Y12 -- 2007 MG|
|A24||New Millennium Obs. in Italy, 5 in MPEC 2013-Y12 -- 2010 XZ67, 381906, 251346, 21088, 162566|
|D29||Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2013-Y12 -- 2013 TB80|
|G403||Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-Y12 -- 2013 VD13|
|K90||Sopot Obs., 1 in MPEC 2013-Y12 -- 2013 NX23|
|587||Sormano Obs. in Italy, 1 in MPEC 2013-Y12 -- 2013 XY8|
|A84||TUBITAK Natl. Obs. in Turkey, 1 in MPEC 2013-Y12 -- 1627|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 20 December '13
Notes for Today's Latest Risk Assessments
|2013 XK22||JPL Sentry||1802||2042-2110||24||7.2e-06||-4.86||-5.27||0||JPL: "Analysis based on 37 observations spanning 5.9210 days (2013-Dec-14.43128 to 2013-Dec-20.35231)." Diameter approximately 0.052 km. from mean, weighted H=24.1.|
|2013 WV44||JPL Sentry||1535||2015-2112||34||1.5e-08||-6.52||-6.83||0||JPL: "Analysis based on 12 observations spanning 1.9534 days (2013-Nov-27.3572 to 2013-Nov-29.310622)." Diameter approximately 0.078 km. from mean, weighted H=23.2.|
|2013 UR1||JPL Sentry||1535||2050||2||2.0e-06||-6.62||-6.67||0||JPL: "Analysis based on 25 observations spanning 7.0358 days (2013-Oct-23.38002 to 2013-Oct-30.415818)." Diameter approximately 0.009 km. from mean, weighted H=27.8.|
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 '13
Times are UTC for when items were noted or added by The Tracking News.
|1802||Noted that JPL Sentry has updated its 2013 XK22 risk assessment - see above|
|1536||Generated Traffic Report|
|1535||Noted that JPL Sentry has updated its 2013 UR1 risk assessment - see above|
Noted that JPL Sentry has updated its 2013 WV44 risk assessment - see above
Grabbed MPEC 2013-Y12 - Daily Orbit Update - see above