Contents on 14 July '17
- Traffic Report -- three objects
- IAU Minor Planet Center
- Observers -- fourteen observers
- Impact Risk Monitoring -- two objects
NOTE: These A/CC news pages will update less often for an extended period. All discoveries and observing credits will be reported, but we may miss some interim impact risk assessments and undercount NEOCP efforts, and there may be some gaps in our traffic reporting for Earth's Busy Neighborhood.
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page
Of 787 risk-listed objects, 29 have had news in the last 31 days. Updated at 1501 UTC on 14 July.
- Ephemerides for risk-listed objects & close passers
- News archive (old) & news image catalog (discontinued)
- Object Links - mainly for radar targets & close passers (mostly discontinued)
- Observing Campaigns (old)
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 14 July '17
Three objects reported inside ten LD
Three asteroidal objects are reported flying inside ten lunar distances (LD) of the planet today. Within Earth's SOI (sphere of gravitational influence), risk-listed 2017 NT5 comes its closest to Earth this time around, reaching 1.11 LD at 1616 UTC, and also its closest to the Moon -- 1.27 LD at 1347 UTC. Further away, 2017 MR8 is inbound from 3.71 to 3.30 LD and 2017 NK2 is outbound from 5.75 to 6.98 LD. On approach next, NHATS target 2017 BS5 enters the ten LD space on July 16th.
This report was generated at 1736 UTC with additional observation of 2017 NT5 in today's DOU MPEC. We also note astrometry for one more radar target posted late yesterday -- NHATS target 2016 WB8 from last December.
NASA/JPL has posted a news item on "Asteroid 2012 TC4 to Safely Pass Earth This October."
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.
NEOCP Activity on 14 July '17
The MPC's NEO Confirmation Page has 15 listings
When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fifteen 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 14 July '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-N74 time-stamped "02:33 UT" - 2015 BG311 - see below
- MPEC 2017-N75 time-stamped "11:59 UT" - Daily Orbit Update
- Observations of risk-listed objects
- K17N05T 2017 NT5 (small asteroid, arc=21 days, H=22.9 ~89m, close passer) from LCOGT Sutherland A (July 13.99-03p7)
- K17M01B 2017 MB1 (Q=4.155 AU, arc=24 days, H=18.7 ~616m) from ATLAS Mauna Loa (July 13.52-55p3)
- Observation campaigns (NHATS targets, radar support)
- g0210 420210 2011 HF (NHATS) from Pan-STARRS 1 (PS1) (July 13.59-60p3)
- J0166 190166 2005 UP156 (radar) from Astronomical Research Obs. Westfield (July 12.21-22p7) and Fabra Obs. (July 12.92-93p5)
- 11398 11398 1998 YP11 (radar) from ARO Westfield (July 10.23-24p5) and SONEAR (July 14.08p3)
- 06063 6063 Jason (1984 KB) (radar) from ARO Westfield (July 12.16p5)
-- NHATS target table & ephemerides -- Planetary radar schedules: Arecibo & Goldstone
- Observations of other objects
- K17N00H 2017 NH (arc=13 days, H=21.6 ~162m) from Castelmartini Obs. (July 12.85p3), Povegliano Veronese Obs. (July 13.85p4), and Chabot Obs. (July 14.20-21p5)
- K17M07N 2017 MN7 (arc=49 days, H=21.5 ~170m) from Chabot Obs. (July 14.23-24p3)
- K17K34R 2017 KR34 (arc=96 days, H=20.1 ~323m) from program code "*" (19) via Faulkes Telescope South (June 29.60-61p4)
- K17K05E 2017 KE5 (arc=60 days, H=21.3 ~186m) from ATLAS Haleakala (July 14.30-33p4)
- K17G06Q 2017 GQ6 (arc=98 days, H=18.9 ~562m) from ARO Westfield (July 12.31-32p3)
- K17B31M 2017 BM31 (arc=167 days, H=20.7 ~245m) from ARO Westfield (July 12.19-20p4), ATLAS Mauna Loa (July 13.43-44p3), and Povegliano Veronese Obs. (July 13.87p4)
- K15BV1G 2015 BG311 (Q=4.030 AU, arc=3 opp, H=18.0 ~851m) from Marc W. Buie via Cerro Tololo Inter-American Obs. (CTIO) (2001 May 22.19p1 & 2001 May 22.27p1)
- K08M01H 2008 MH1 (Q=4.270 AU, arc=2 opp, H=18.3 ~741m) from ARO Westfield (July 12.34p5)
- J89V00B 1989 VB (arc=4 opp, H=19.7 ~389m) from SONEAR (July 14.03-05p3)
- n6018 496018 2008 NU from ARO Westfield (July 12.35-36p4)
- a6733 366733 2004 BG121 from ARO Westfield (July 12.37-38p4)
- E2561 142561 2002 TX68 from ARO Westfield (July 12.28-29p5)
- D8846 138846 2000 VJ61 from ARO Westfield (July 12.15-16p7) and ATLAS Mauna Loa (July 13.41-43p4)
- D6818 136818 Selqet (1997 MW1) from ARO Westfield (July 12.18p4 & 12.24-25p5)
- A6589 106589 2000 WN107 from ARO Westfield (July 12.30-31p6) and ATLAS Mauna Loa (July 13.46-49p4)
- 66391 66391 1999 KW4 from ARO Westfield (July 12.12-13p4)
- 20460 20460 Robwhiteley (1999 LO28) from ARO Westfield (July 12.22-23p5) and Hoyerswerda Obs. (July 13.87-89p2)
- 07336 7336 Saunders (1989 RS1) from ATLAS Mauna Loa (July 13.48-51p4)
- 02329 2329 Orthos (1976 WA) from ARO Westfield (July 12.18-19p5)
- 01980 1980 Tezcatlipoca (1950 LA) from ARO Westfield (July 12.11-12p5)
MPEC 2017-N74 - "02:33 UT" - 2015 BG311
- K15BV1G 2015 BG311 (Q=4.030 AU, H=18.0 ~851m) from UH/Tholen NEO Follow-Up 2.24m Telescope (April 20.46p1 at G=23.8 & 21.49p1 at G=24.7)
Observers on 14 July '17
Fourteen observers appear in today's MPECs.
|Code||Observer / observatory|
|H21||Astronomical Research Obs. Westfield in Illinois, 16 in MPEC 2017-N75 -- 2017 GQ6, 2017 BM31, 2008 MH1, 66391, 496018, 366733, 20460, 190166, 142561, 138846, 136818, 11398, 106589, 6063, 2329, 1980|
|T05||ATLAS Haleakala in Hawaii, 1 in MPEC 2017-N75 -- 2017 KE5|
|T08||ATLAS Mauna Loa in Hawaii, 5 in MPEC 2017-N75 -- 2017 MB1, 2017 BM31, 138846, 106589, 7336|
|160||Castelmartini Obs. in Italy, 1 in MPEC 2017-N75 -- 2017 NH|
|8071||Marc W. Buie via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-N75 -- 2015 BG311|
|G58||Chabot Obs. in northern California, 2 in MPEC 2017-N75 -- 2017 NH, 2017 MN7|
|006||Fabra Obs. in Spain, 1 in MPEC 2017-N75 -- 190166|
|E10*||program code "*" (19) via Faulkes Telescope South in New South Wales, 1 in MPEC 2017-N75 -- 2017 KR34|
|C43||Hoyerswerda Obs. in Germany, 1 in MPEC 2017-N75 -- 20460|
|K91||LCOGT Sutherland A in South Africa, 1 in MPEC 2017-N75 -- 2017 NT5|
|F51||Pan-STARRS 1 in Hawaii, 1 in MPEC 2017-N75 -- 420210|
|A48||Povegliano Veronese Obs. in Italy, 2 in MPEC 2017-N75 -- 2017 NH, 2017 BM31|
|Y00||SONEAR in Brazil, 2 in MPEC 2017-N75 -- 1989 VB, 11398|
|T12||UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-N74 -- 2015 BG311|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 14 July '17
Notes for Today's Latest Risk Assessments
|2017 NT5||JPL Sentry||1501||2050-2115||7||8.89759e-07||-5.00||-5.43||0||JPL: Computed at 07:55 today Pacific time based on 68 observations spanning 20.566 days (2017-Jun-23.45994 to 2017-Jul-14.026395). Diameter approximately 0.091 km. from weighted mean H=22.86.|
|NEODyS||1322||2050-2117||12||9.09e-07||-5.05||-5.58||0||NEODyS: "Based on 61 optical observations (of which 0 are rejected as outliers) from 2017-06-23.461 to 2017-07-13.747."|
|2017 MB1||JPL Sentry||1501||R E M O V E D||JPL: Risk listing removed at 1453 UTC today.|
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 14 July '17
Times are UTC for when items were noted or added by The Tracking News.
|1736||Generated Traffic Report|
|1501||Noted that JPL Sentry has removed 2017 MB1 as an impact risk - see above|
Noted that JPL Sentry has updated its 2017 NT5 risk assessment - see above
|1322||Noted that NEODyS has posted 2017 NT5 as an impact risk - see above|
Grabbed MPEC 2017-N74 - 2015 BG311 - see above
Grabbed MPEC 2017-N75 - Daily Orbit Update - see above