Contents on 1 February '18
- Traffic Report -- seven objects
- IAU Minor Planet Center
- Observers -- five observers
- Impact Risk Monitoring -- three objects
Asteroid/Comet Connection (A/CC) Resources:
- Consolidated Risk Tables - the CRT page
Of 920 risk-listed objects, 54 have had news in the last 31 days. Updated at 1902 UTC on 1 Feb.
- 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 1 February '18
Seven objects reported inside ten LD
There are seven asteroids known to be less than ten lunar distances (LD) from our home world today. Nearest are 2018 BQ6, which is outbound from 4.67 to 6.37 LD, and 2018 AH12, inbound from 6.67 to 6.05 LD, while risk-listed intruder 2018 BC slips away from 6.09 to 6.56 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|
|0.73 LD Jan. 19||2018 BC||4 m||6.09 to 6.56 LD||Dec. 30 - Feb. 9||intruder, NHATS target, risk|
|3.07 LD Jan. 23||2018 BJ6||7 m||7.32 to 8.06 LD||Jan. 12 - Feb. 4||NHATS target|
|3.40 LD Jan. 30||2018 BE6||44 m||7.08 to 10.59 LD||Jan. 27 - today||exits ten LD|
|3.60 LD Jan. 30||2018 BQ6||12 m||4.67 to 6.37 LD||Jan. 26 - Feb. 3|
|5.31 LD Feb. 4||2018 AH12||14 m||6.05 from 6.67 LD||Jan. 28 - Feb. 12||NHATS target|
|6.7 LD Jan. 15*||2018 AV2||6 m||7.1 to 7.1 LD||Nov. 10 - March 2||EPU +/- 9 mins.*, NHATS target, natural?|
|9.27 LD Jan. 27||2018 BQ||26 m||9.85 to 10.13 LD||Jan. 22 - today||NHATS target, exits ten LD|
This report was generated at 1740 UTC with astrometry in today's DOU MPEC for departed 2018 BU1.
|Approaching Traffic - sorted by 10-LD bubble entry date|
|Earth passage||I D||~Size||Distance today||Inside ten LD||Notes|
|3.7 LD Feb. 24*||2017 DR109||10 m||38.4 from 40.3 LD||Feb. 18 - March 1||EPU +/- 30 mins.*, NHATS target|
|3.76 LD March 7||2017 VR12||267 m||45.69 from 46.99 LD||Feb. 28 - March 13||radar/NHATS target|
|6.9 LD March 10*||2015 DK200||26 m||72.2 from 74.6 LD||March 6 - 14||EPU +/- 23.45 hours*, NHATS target|
|* EPU = Earth passage uncertainty|
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 1 February '18
The MPC's NEO Confirmation Page has 31 listings
When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 31 objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of 32 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 1 February '18
Minor Planet Electronic Circulars
As of last check at 2358 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- Observations of recently (no longer) risk-listed objects
- K18A02E 2018 AE2 (arc=26 days, H=20.0 ~339m) from ATLAS Mauna Loa (Jan. 31.54-56p4)
- Observations of close-passing objects
- K18B01U 2018 BU1 (arc=8 days, H=24.6 ~41m) from Castelmartini Obs. (Jan. 21.89p3)
- Observations of other objects
- n6818 496818 1993 RA from Pan-STARRS 1 (PS1) (Jan. 31.34-36p3)
- l5967 475967 2007 JF22 from Northolt Branch Obs. (Jan. 31.94-95p4)
- c5580 385580 2004 XO14 from Castelmartini Obs. (Jan. 21.88-89p3)
- b0061 370061 2000 YO29 from PS1 (Jan. 31.29-31p3)
- X3888 333888 1998 ST4 from Castelmartini Obs. (Jan. 21.85p3)
- U2311 302311 2002 AA from Castelmartini Obs. (Jan. 21.90-91p3)
- J4126 194126 2001 SG276 from PS1 (Jan. 31.61-62p2 & 31.67p1)
- F4991 154991 Vinciguerra (2005 BX26) from PS1 (Jan. 31.28-32p4)
- F4347 154347 2002 XK4 from Northolt Branch Obs. (Jan. 31.90-91p6)
- F3349 153349 2001 PJ9 from Castelmartini Obs. (Jan. 21.88p3)
- D6849 136849 1998 CS1 from PS1 (Jan. 31.28-30p3)
- 68278 68278 2001 FC7 from Castelmartini Obs. (Jan. 21.93-94p3)
- 08567 8567 1996 HW1 from Castelmartini Obs. (Jan. 21.92p3)
- 07977 7977 1977 QQ5 from Castelmartini Obs. (Jan. 21.93p3)
- 01980 1980 Tezcatlipoca (1950 LA) from ATLAS Haleakala (Jan. 31.21-22p3)
Observers on 1 February '18
Five observers appear in today's MPEC.
|Code||Observer / observatory|
|T05||ATLAS Haleakala in Hawaii, 1 in MPEC 2018-C01 -- 1980|
|T08||ATLAS Mauna Loa in Hawaii, 1 in MPEC 2018-C01 -- 2018 AE2|
|160||Castelmartini Obs. in Italy, 8 in MPEC 2018-C01 -- 2018 BU1, 68278, 385580, 333888, 302311, 153349, 8567, 7977|
|Z80||Northolt Branch Obs. in England, 2 in MPEC 2018-C01 -- 475967, 154347|
|F51||Pan-STARRS 1 (PS1) in Hawaii, 5 in MPEC 2018-C01 -- 496818, 370061, 194126, 154991, 136849|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 1 February '18
Notes for Today's Latest Risk Assessments
|2018 BP6||NEODyS||1700||2070-2076||2||4.96e-08||-7.12||-7.17||0||NEODyS: "Based on 40 optical observations (of which 3 are rejected as outliers) from 2018-01-27.354 to 2018-01-30.119."|
|2018 BC||NEODyS||1700||2083-2113||26||6.64e-05||-6.76||-7.22||0||NEODyS: "Based on 59 optical observations (of which 1 are rejected as outliers) from 2018-01-17.211 to 2018-01-20.504."|
|2011 CF66||JPL Sentry||1902||2018-2117||835||1.42283399e-05||-6.00||-7.22||0||JPL: Computed at 03:11 April 7th of 2017 Pacific time based on 11 observations spanning .17761 days (2011-Feb-13.33976 to 2011-Feb-13.51737). Diameter approximately 0.009 km. from weighted mean H=27.83.|
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 1 February '18
Times are UTC for when items were noted or added by The Tracking News.
|1902||Noted that JPL Sentry has updated its 2011 CF66 risk assessment - see above|
|1740||Generated Traffic Report|
|1700||Noted that NEODyS has updated its 2018 BC risk assessment - see above|
Noted that NEODyS has posted 2018 BP6 as an impact risk - see above
Grabbed MPEC 2018-C01 - Daily Orbit Update - see above