Contents on 15 February '13
- Traffic Report -- five objects
- IAU Minor Planet Center
- Observers -- fourteen observers
- Impact Risk Monitoring -- two objects
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page (archive)
Of 479 risk-listed objects, 24 have had news in the last 31 days. Updated at 1708 UTC on 15 Feb.
- 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 3 Feb.
- 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 15 February '13
Five objects reported inside ten LD
There are five visitors reported to be inside ten lunar distances (LD) of Earth today. Intruder 2012 DA14 (risk-listed radar target) spends most of the day inside the Earth-Moon system, coming in from 1.18 and going out to 0.30 LD, reaching 0.09 LD at 1925 UT.
Out further, radar target 2013 BV15 is outbound from 4.85 to 6.20 LD and radar target 2013 BS45 from 5.28 to 5.58 LD, while 2013 CE82 is inbound from 9.20 to 6.80 LD and 2013 CZ87 from 9.62 to 8.62 LD.
Next known to be approaching is risk-listed 2007 EO88, which arrives inside ten LD on March 15th.
World news: A tiny object entered Earth's atmosphere over the city of Chelyabinsk in Russia this morning local time, with the resulting shockwave causing structural damage and injuring around a thousand people according to news reports. NASA has issued a statement that this event is unrelated to 2012 DA14 and its close Earth passage today. See Phil Plait's blog and this update at Slate and Emily Lakdawalla's blog at The Planetary Society for info and links. Late addition: See Peter Brown's report reposted to the MPML with confirmation that this is probably the largest recorded such event since Tunguska in 1908.
This report was updated at 1925 UTC with discovery of recently departed 2013 CN118 (MPEC). Today's first traffic report was generated at 1709 UTC with follow-up for 2012 DA14 (MPEC). A DOU MPEC hasn't been posted yet today.
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 15 February '13
The MPC's NEO Confirmation Page has 62 listings
When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 62 objects listed. Of these, 41 were "one nighters." So far The Tracking News has counted a total of 73 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 15 February '13
Minor Planet Electronic Circulars
As of last check at 2359 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts. No Daily Orbit Update DOU MPEC has been posted yet, so visit the MPC Status Page for possible explanation.
- MPEC 2013-C72 time-stamped "14:26 UT" - 2012 DA14 - see below
- MPEC 2013-C73 time-stamped "16:13 UT" - 2013 CJ118 - see below
- MPEC 2013-C74 time-stamped "16:50 UT" - 2002 LY1 - see below
- MPEC 2013-C75 time-stamped "17:09 UT" - 2013 CL118 - see below
- MPEC 2013-C76 time-stamped "17:14 UT" - 2013 CM118 - see below
- MPEC 2013-C77 time-stamped "17:19 UT" - 2013 CN118
MPEC 2013-C77 - "17:19 UT" - 2013 CN118
- K13CB8N 2013 CN118 (Earth MOID=3.2 LD, i=3.2°, H=25.5 ~27m, close passer) from the Mt. Lemmon Survey (MLS) (Feb. 14.15-17p5, 14.33p3 & 15.18p5), Astronomical Research Obs. Westfield (Feb. 14.25-27p2), ESA Optical Ground Station (ESA OGS) (Feb. 14.88-89p3), and Great Shefford Obs. (Feb. 14.90-92p2)
MPEC 2013-C76 - "17:14 UT" - 2013 CM118
- K13CB8M 2013 CM118 (small asteroid, H=25.3 ~29m) from Pan-STARRS 1 (PS1) (Feb. 13.36-39p3), ARO Westfield (Feb. 14.25-27p3), and ESA OGS (Feb. 14.99p3)
MPEC 2013-C75 - "17:09 UT" - 2013 CL118
- K13CB8L 2013 CL118 (H=20.6 ~257m) from PS1 (Feb. 12.28-32p3), the Spacewatch 1.8m telescope (Feb. 13.15-16p3 & 14.11-12p3), McDonald Obs. (Feb. 14.27-29p3 at R=21.8-22.1), and ESA OGS (Feb. 14.87-88p3)
MPEC 2013-C74 - "16:50 UT" - 2002 LY1
- K02L01Y 2002 LY1 (borderline-small, Earth MOID=4.6 LD, i=2.9°, H=21.9 ~141m) from PS1 (Feb. 14.24-27p4), Great Shefford Obs. (Feb. 14.81-82p3), ESA OGS (Feb. 14.84p3), Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Feb. 15.02-03p3), and ARO Westfield (Feb. 15.05p2)
MPEC 2013-C73 - "16:13 UT" - 2013 CJ118
- K13CB8J 2013 CJ118 (Centaur, q=5.333 AU, Q=14.552 AU, H=14.5 ~4.26 km) from PS1 (Feb. 9.38-42p4) and ESA OGS (Feb. 11.97-98p3, 12.98-99p3 & 14.97-98p3)
MPEC 2013-C72 - "14:26 UT" - 2012 DA14
- K12D14A 2012 DA14 (risk listed, Q=0.992 AU, Earth MOID=0.0 LD, H=24.1 ~51m, close passer, radar support) from Holmes/CTIO (Feb. 14.06-07p5), Arcadia Obs. (Feb. 14.43-46p5, 14.51-52p2 & 15.44p7), Tim Lister via Faulkes Telescope South (Feb. 14.46-47p7), Kevin Hills via RAS Obs. Moorook (Feb. 14.58-60p7), Auger Obs. (Feb. 15.03-04p3), Cordoba Obs. Bosque Alegre Station (Feb. 15.06-07p3), and Murrumbateman Obs. (Feb. 15.49p4)
Observers on 15 February '13
Fourteen observers appear in today's MPECs.
|Code||Observer / observatory|
|E23||Arcadia Obs. in New South Wales, 1 in MPEC 2013-C72 -- 2012 DA14|
|H21||Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2013-C74, 2013-C76 & 2013-C77 -- 2013 CN118, 2013 CM118, 2002 LY1|
|I47||Auger Obs. in Argentina, 1 in MPEC 2013-C72 -- 2012 DA14|
|807|||Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2013-C72 & 2013-C74 -- 2012 DA14, 2002 LY1|
|821||Cordoba Obs. Bosque Alegre Station in Argentina, 1 in MPEC 2013-C72 -- 2012 DA14|
|J04||ESA Optical Ground Station (ESA OGS) in the Canary Islands, 5 in MPECs 2013-C73, 2013-C74, 2013-C75, 2013-C76 & 2013-C77 -- 2013 CN118, 2013 CM118, 2013 CL118, 2013 CJ118, 2002 LY1|
|E100||Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2013-C72 -- 2012 DA14|
|J95||Great Shefford Obs. in England, 2 in MPECs 2013-C74 & 2013-C77 -- 2013 CN118, 2002 LY1|
|711||McDonald Obs. in Texas, 1 in MPEC 2013-C75 -- 2013 CL118|
|G96||Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-C77 -- 2013 CN118|
|E07||Murrumbateman Obs. in New South Wales, 1 in MPEC 2013-C72 -- 2012 DA14|
|F51||Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2013-C73, 2013-C74, 2013-C75 & 2013-C76 -- 2013 CM118, 2013 CL118, 2013 CJ118, 2002 LY1|
|D90`||Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2013-C72 -- 2012 DA14|
|291||Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-C75 -- 2013 CL118|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 15 February '13
Notes for Today's Latest Risk Assessments
|2013 CY||JPL Sentry||0501||2069-2091||5||3.5e-06||-7.38||-7.84||0||JPL: "Analysis based on 69 observations spanning 11.951 days (2013-Feb-01.34874 to 2013-Feb-13.29949)." Diameter approximately 0.007 km. from mean, weighted H=28.3.|
|2012 DA14||JPL Sentry||1706||R E M O V E D||JPL: Risk listing removed at 1639 UTC.|
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 15 February '13
Times are UTC for when items were noted or added by The Tracking News.
|1925||Updated Traffic Report|
|1749||Grabbed MPEC 2013-C75 - 2013 CL118 - see above|
Grabbed MPEC 2013-C76 - 2013 CM118 - see above
Grabbed MPEC 2013-C77 - 2013 CN118 - see above
|1706||Noted that JPL Sentry has removed 2012 DA14 as an impact risk - see above|
Grabbed MPEC 2013-C72 - 2012 DA14 - see above
Grabbed MPEC 2013-C73 - 2013 CJ118 - see above
Grabbed MPEC 2013-C74 - 2002 LY1 - see above
|0501||Noted that JPL Sentry has updated its 2013 CY risk assessment - see above|