Contents on 13 January '17
- Traffic Report -- two objects
- Radar Astrometry -- two objects
- IAU Minor Planet Center
- Observers -- nine observers
- Impact Risk Monitoring -- one object
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page
Of 743 risk-listed objects, 36 have had news in the last 31 days. Updated at 1712 UTC on 13 Jan.
- Ephemerides for risk-rated, nearby objects & NHATS targets
- News archive (old) & news image catalog (discontinued)
- Object Links - mainly for radar targets & close passers (mostly discontinued)
- Observing Campaigns (revised 8 April)
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. To keep track of what's new each day, watch the Chronology section.
Traffic Report on 13 January '17
Two objects reported inside ten LD
Today there are two asteroids reported within ten lunar distances (LD) of our home world. 2017 AJ13 is inbound from 7.56 to 6.80 LD and NHATS target 2017 AZ3 is outbound from 7.67 to 8.93 LD. Coming around next, NHATS target 2016 YC8 enters our ten-LD traffic reporting "bubble" on January 16th.
This report was generated at 1818 UTC with follow-up from late December in today's DOU MPEC for risk-listed 2016 WQ1, adding 22.13 days to its previous 11.90-day observing arc.
Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting on transient natural objects that approach the actually significant gravitational sphere of influence (SOI), which has a radius of about 2.41 LD from Earth's center. This puts a focus on some of the most important and very best NEO observation work, representative of the much larger NEO discovery and tracking effort. Object distances are derived by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.
Radar Astrometry on 13 January '17
Radar observation of two objects
Data update noted at 2305 UTC when the database was dated 13 Jan.
- 2016 LX48 from Arecibo (2016 Sept. 9.91 range, 10.96 range & 11.93 range) and Goldstone DSS-14 70m antenna (2016 Sept. 17.37 velocity, 17.38 range, 17.40 range & 19.33 range)
Data update noted at 2358 UTC when the database was dated 13 Jan.
- 433953 1997 XR2 (NHATS target) from DSS-14 (2016 Nov. 16.54 velocity, 16.56 range, 16.56 range, 16.58 range, 17.36 velocity & 17.37 range) and Arecibo (2016 Nov. 26.25 range & Dec. 6.22 range)
NEOCP Activity on 13 January '17
The MPC's NEO Confirmation Page has 51 listings
When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 51 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 54 listings on the NEOCP today.
New MPECs on 13 January '17
Minor Planet Electronic Circulars
As of last check at 2358 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2017-A79 time-stamped "13:10 UT" - Daily Orbit Update - see below
- MPEC 2017-A80 time-stamped "14:15 UT" - 2011 SR12
MPEC 2017-A80 - "14:15 UT" - 2011 SR12
- K11S12R 2011 SR12 (H=19.6 ~407m) from Pan-STARRS 1 (PS1) (Jan. 12.32-35p3), LCOGT Sutherland B (Jan. 12.80-82p5), and Sergio Foglia via iTelescope Obs. Siding Spring (Jan. 13.45-47p3)
- Observations of risk-listed objects
- K16W01Q 2016 WQ1 (small asteroid, arc=34 days, H=27.8 ~9m, close passer) from UH/Tholen NEO Follow-Up 2.24m Telescope (Dec. 24.45p1 at G=25.0)
- Observation campaigns (NHATS targets, radar support)
- K16A08U 2016 AU8 (arc=3 opp, H=19.9 ~355m, NHATS) from PS1 (Jan. 13.30-32p3)
- j2389 452389 2002 NW16 (NHATS) from PS1 (Jan. 13.29-32p3)
- F2563 152563 1992 BF (NHATS) from PS1 (Jan. 13.29-31p3)
- 85990 85990 1999 JV6 (NHATS, radar) from Cosmos Obs. (Jan. 12.82-83p6)
-- NHATS target table & ephemerides -- Planetary radar schedules: Arecibo & Goldstone
- Observations of other objects
- K15Y18E 2015 YE18 (arc=2 opp, H=17.7 ~977m) from PS1 (Jan. 12.44-47p3)
- K14A17D 2014 AD17 (arc=2 opp, H=20.2 ~309m) from Castelmartini Obs. (Jan. 10.00p3)
- F9608 159608 2002 AC2 from Castelmartini Obs. (Jan. 9.97-98p3)
- D8846 138846 2000 VJ61 from Castelmartini Obs. (Jan. 9.95p3)
- 96590 96590 1998 XB from Castelmartini Obs. (Jan. 9.90p3) and PS1 (Jan. 13.30-32p3)
- 05836 5836 1993 MF from Castelmartini Obs. (Jan. 9.91p3)
- 05653 5653 Camarillo (1992 WD5) from Purple Mtn. Obs. Xuyi Station (Jan. 12.56-59p3)
- 05131 5131 1990 BG from Castelmartini Obs. (Jan. 9.93-94p3)
- 03352 3352 McAuliffe (1981 CW) from Castelmartini Obs. (Jan. 9.90p3)
- 01627 1627 Ivar (1929 SH) from Castelmartini Obs. (Jan. 9.95-96p3)
Observers on 13 January '17
Nine observers appear in today's MPECs.
|Code||Observer / observatory|
|251||Arecibo in Puerto Rico, 2 in radar -- 2016 LX48, 433953|
|160||Castelmartini Obs. in Italy, 8 in MPEC 2017-A79 -- 2014 AD17, 96590, 159608, 138846, 5836, 5131, 3352, 1627|
|Z45||Cosmos Obs., 1 in MPEC 2017-A79 -- 85990|
|253||Goldstone DSS-14 70m antenna in southern California, 2 in radar -- 2016 LX48, 433953|
|Q62|||Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A80 -- 2011 SR12|
|K92||LCOGT Sutherland B in South Africa, 1 in MPEC 2017-A80 -- 2011 SR12|
|F51||Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2017-A79 & 2017-A80 -- 2016 AU8, 2015 YE18, 2011 SR12, 96590, 452389, 152563|
|D29||Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2017-A79 -- 5653|
|T12||UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-A79 -- 2016 WQ1|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 13 January '17
Notes for Today's Latest Risk Assessments
|2016 WQ1||JPL Sentry||1712||2103||1||8.4e-08||-8.83||-8.83||0||JPL: "Analysis based on 58 observations spanning 34.037 days (2016-Nov-20.40832 to 2016-Dec-24.44531)." Diameter approximately 0.009 km. from mean, weighted H=27.9.|
|NEODyS||1712||2046-2116||8||1.49e-07||-8.57||-9.05||0||NEODyS: "Based on 60 optical observations (of which 1 are rejected as outliers) from 2016-11-20.409 to 2016-12-24.446."|
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 13 January '17
Times are UTC for when items were noted or added by The Tracking News.
|2358||Noted Radar Astrometry database update - see above|
|2305||Noted Radar Astrometry database update - see above|
|1818||Generated Traffic Report|
|1712||Noted that JPL Sentry has updated its 2016 WQ1 risk assessment - see above|
Noted that NEODyS has updated its 2016 WQ1 risk assessment - see above
Grabbed MPEC 2017-A79 - Daily Orbit Update - see above
Grabbed MPEC 2017-A80 - 2011 SR12 - see above