Contents on 31 October '18
- Traffic Report -- five objects
- IAU Minor Planet Center
- Observers -- nine observers
- Impact Risk Monitoring -- two objects
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page
Of 984 risk-listed objects, 50 have had news in the last 31 days. Updated at 1701 UTC on 31 Oct.
- 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 31 October '18
Five objects reported inside ten LD
There are five asteroidal objects known to be inside ten lunar distances (LD) of our planet today. Nearest is inbound 2018 UD3, which moves in from 4.76 to 3.27 LD.
|Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries|
|Earth passage||I D||~Size||Distance today||Inside ten LD||Notes|
|1.62 LD Nov. 2||2018 UD3||19 m||3.27 from 4.76 LD||Oct. 27 - Nov. 8||DOU|
|3.9 LD Dec. 2*||2018 TG6||11 m||9.5 from 9.8 LD||yesterday - Jan. 5||EPU +/- 8 mins.*, NHATS target, risk|
|5.37 LD yesterday||2018 UC||22 m||5.40 to 5.99 LD||Oct. 26 - Nov. 3||NHATS target|
|7.51 LD Oct. 29||475534 2006 TS7||195 m||9.68 to 12.66 LD||Oct. 27 - 31||exits ten LD|
|* EPU = Earth passage uncertainty|
This report was generated at 1910 UTC with follow-up in today's DOU MPEC for inbound 2018 UD3 and approaching objects 2018 UY1 and 2018 TF3.
Due to travel, time constraints, and delays in data source availability, more or less in that order of importance, we posted only a minimal report here on Saturday, October 27th, and no report for the following two days, finally catching up late yesterday. To see what asteroid observations were reported by whom on those days, see the respective DOU MPECs.
In view of such problems in data flow and processing, which are increasing but not usually so visible to our readers, this may be a good time to give first notice that we will be retiring this Web site sometime over the next twenty-three months, quite possibly sooner. While we don't expect to find a knowledgeable volunteer to assume the work and responsibilities, and make a fresh start at continuing what we've been doing here for sixteen-plus years, but we're certainly open to the possibility.
|Approaching - sorted by 10-LD bubble entry date|
|Earth passage||I D||~Size||Distance today||Inside ten LD||Notes|
|7.42 LD Nov. 4||2018 UY1||52 m||10.41 from 11.81 LD||Nov. 1 - 8||NHATS target - DOU|
|7.77 LD Nov. 5||2018 TF3||286 m||23.35 from 27.78 LD||Nov. 4 - 7||DOU|
|9.4 LD Nov. 13*||2018 UQ1||146 m||37.7 from 40.6 LD||Nov. 12 - 15||EPU +/- 9 mins.*|
|7.4 LD Nov. 27*||2008 WD14||89 m||53.3 from 55.1 LD||Nov. 23 - 30||EPU +/- 2.04 days*|
|4.1 LD Dec. 9*||2013 VX4||62 m||54.0 from 55.3 LD||Dec. 3 - 15||EPU +/- 2.35 days*|
|7.36 LD Dec. 22||163899 2003 SD220||1.17 km||62.76 from 63.64 LD||Dec. 17 - 26||NHATS target|
|7.3 LD Jan. 9*||2013 YM2||19 m||61.5 from 62.1 LD||Jan. 2 - 16||EPU +/- 1.25 days*, NHATS target|
Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's 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 temporal 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 31 October '18
The MPC's NEO Confirmation Page has 6 listings
When last checked at 2331 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six objects listed. Of these, two were "one nighters."
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 31 October '18
Minor Planet Electronic Circulars
As of last check at 2331 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
- K18U01M 2018 UM1 (small asteroid, arc=12 days, H=23.5 ~68m, NHATS target) from Great Shefford Obs. (Oct. 30.89-90p3)
- Observations of recently (no longer) risk-listed objects
- K18T03F 2018 TF3 (arc=25 days, H=20.4 ~282m, close passer) from roving observer (Oct. 31.32-34p3)
- Observations of close-passing objects
- K18U03D 2018 UD3 (arc=16 days, H=26.3 ~19m) from Great Shefford Obs. (Oct. 30.91-92p3)
- K18U01Y 2018 UY1 (arc=10 days, H=24.1 ~51m, NHATS target) from roving observer (Oct. 28.17-21p2, 29.14-16p3 & 31.24-26p3), Great Shefford Obs. (Oct. 30.97p4), Squirrel Valley Obs. (Oct. 31.03-05p3), and Wiggins Obs. (Oct. 31.37-38p6)
- Observation campaigns (NHATS targets, radar support)
- K18U03C 2018 UC3 (arc=3 days, H=25.4 ~28m, NHATS) from Great Shefford Obs. (Oct. 30.98-99p4)
- K18U01J 2018 UJ1 (arc=13 days, H=23.5 ~68m, NHATS) from Wiggins Obs. (Oct. 31.39-40p5)
-- NHATS target table
- Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
- K18U03A 2018 UA3 (arc=3 days, H=23.7 ~62m) from Great Shefford Obs. (Oct. 30.87-88p3)
- K18U02S 2018 US2 (Q=4.932 AU, arc=3 days, H=24.9 ~35m) from Steward Obs. Mt. Lemmon Station (Oct. 31.48p4)
- K18U02K 2018 UK2 (i=49.3°, arc=4 days, H=23.1 ~81m) from Great Shefford Obs. (Oct. 30.85-86p4)
- K18T02Q 2018 TQ2 (arc=26 days, H=21.8 ~148m) from Wiggins Obs. (Oct. 31.40-41p6)
- Observations of other objects
- K18U01A 2018 UA1 (Q=4.111 AU, arc=8 days, H=19.7 ~389m) from SATINO-1 (Oct. 20.81-83p4)
- K18T01T 2018 TT1 (Q=4.414 AU, arc=27 days, H=18.4 ~708m) from Wiggins Obs. (Oct. 31.42-43p6)
- K18R00L 2018 RL (arc=58 days, H=19.8 ~371m) from the Catalina Sky Survey (CSS) (Oct. 30.17-19p4) and Wiggins Obs. (Oct. 31.36-37p4)
- K18P22E 2018 PE22 (Q=4.419 AU, arc=82 days, H=21.0 ~214m) from Purple Mtn. Obs. Xuyi Station (Oct. 29.58-60p2)
- K18N00B 2018 NB (arc=2 opp, H=19.3 ~467m) from Xuyi Sta. (Oct. 29.57-60p3) and Squirrel Valley Obs. (Oct. 31.07-10p3)
- K15N02U 2015 NU2 (arc=2 opp, H=20.9 ~224m) from roving observer (Oct. 31.21-23p3) and Wiggins Obs. (Oct. 31.34-35p5)
- q3596 523596 2002 PH80 from Xuyi Sta. (Oct. 29.61-63p3)
- q3592 523592 2001 SK276 from the Mt. Lemmon Survey (MLS) (Oct. 30.16-17p4)
- j7260 457260 2008 RY24 from Xuyi Sta. (Oct. 30.80-83p3)
- i6791 446791 1998 SJ70 from Xuyi Sta. (Oct. 29.48-51p3)
- i3923 443923 2002 RU25 from MLS (Oct. 30.20-22p4) and CSS (Oct. 30.20-22p4)
- f4903 414903 2010 XT45 from Xuyi Sta. (Oct. 29.74-77p3)
- f3002 413002 1999 VG22 from Xuyi Sta. (Oct. 29.56-59p3)
- U8043 308043 2004 TH10 from CSS (Oct. 30.20-21p3)
- P0162 250162 2002 TY57 from Xuyi Sta. (Oct. 29.69-72p3)
- O4670 244670 2003 KN18 from Xuyi Sta. (Oct. 29.70-73p2)
- F5340 155340 2006 SK198 from Xuyi Sta. (Oct. 29.52-55p3)
- E0333 140333 2001 TD2 from Xuyi Sta. (Oct. 29.48-50p3)
- 65733 65733 1993 PC from CSS (Oct. 30.20-22p3)
- 17511 17511 1992 QN from Xuyi Sta. (Oct. 29.47-50p3)
- 12538 12538 1998 OH from Xuyi Sta. (Oct. 29.85-89p3)
- 09058 9058 1992 JB from Xuyi Sta. (Oct. 29.53-59p5)
- 05653 5653 Camarillo (1992 WD5) from Xuyi Sta. (Oct. 29.47-50p3)
- 01916 1916 Boreas (1953 RA) from Xuyi Sta. (Oct. 29.44-47p3)
Observers on 31 October '18
Nine observers appear in today's MPEC.
|Code||Observer / observatory|
|703||Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2018-U90 -- 2018 RL, 65733, 443923, 308043|
|J95||Great Shefford Obs. in England, 6 in MPEC 2018-U90 -- 2018 UY1, 2018 UM1, 2018 UK2, 2018 UD3, 2018 UC3, 2018 UA3|
|G96||Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2018-U90 -- 523592, 443923|
|D29||Purple Mtn. Obs. Xuyi Station in China, 16 in MPEC 2018-U90 -- 2018 PE22, 2018 NB, 523596, 457260, 446791, 414903, 413002, 250162, 244670, 17511, 155340, 140333, 12538, 9058, 5653, 1916|
|247||roving observer, 3 in MPEC 2018-U90 -- 2018 UY1, 2018 TF3, 2015 NU2|
|C95||SATINO-1 in France, 1 in MPEC 2018-U90 -- 2018 UA1|
|W34||Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-U90 -- 2018 UY1, 2018 NB|
|I52||Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2018-U90 -- 2018 US2|
|718||Wiggins Obs. in Utah, 6 in MPEC 2018-U90 -- 2018 UY1, 2018 UJ1, 2018 TT1, 2018 TQ2, 2018 RL, 2015 NU2|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 31 October '18
Notes for Today's Latest Risk Assessments
|2018 UM1||JPL Sentry||1700||2067-2116||20||5.415961e-05||-3.91||-4.31||0||JPL: Computed at 07:04 today Pacific time based on 91 observations spanning 11.758 days (2018-Oct-19.1455 to 2018-Oct-30.903047). Diameter approximately 0.070 km. from weighted mean H=23.42.|
|2014 HR197||JPL Sentry||1700||2019-2112||194||7.78473e-08||-7.25||-8.30||0||JPL: Computed at 10:48 April 9th of 2017 Pacific time based on 15 observations spanning .95899 days (2014-Apr-24.15618 to 2014-Apr-25.11517). Diameter approximately 0.014 km. from weighted mean H=26.93.|
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 31 October '18
Times are UTC for when items were noted or added by The Tracking News.
|1910||Generated Traffic Report|
|1700||Noted that JPL Sentry has updated its 2014 HR197 risk assessment - see above|
Noted that JPL Sentry has updated its 2018 UM1 risk assessment - see above
Grabbed MPEC 2018-U90 - Daily Orbit Update - see above