Contents  on 2 February '18

Asteroid/Comet Connection (A/CC) Resources:

The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection.

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 2 February '18

Six objects reported inside ten LD

There are six transient natural objects reported within ten lunar distances (LD) of Earth today. Nearest is 2018 AH12, inbound from 6.05 to 5.60 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  6.56 to 7.03 LD Dec. 30 - Feb. 9 intruder, NHATS target, risk
3.07 LD Jan. 23 2018 BJ6 7 m  8.06 to 8.82 LD Jan. 12 - Feb. 4 NHATS target
3.61 LD Jan. 30 2018 BQ6 11 m  6.37 to 8.35 LD Jan. 26 - tomorrow risk - DOU
3.65 LD Feb. 5 2018 BP6 40 m  8.30 from 11.16 LD today - Feb. 8 enters ten LD, risk - DOU
5.31 LD Feb. 4 2018 AH12 14 m  5.60 from 6.05 LD Jan. 28 - Feb. 12 NHATS target - DOU
6.7   LD Jan. 15* 2018 AV2 6 m  7.1 to 7.2 LD Nov. 10 - March 2 EPU +/- 9 mins.*, NHATS target, natural?

This report was generated at 1751 UTC with first follow-up for inbound risk-listed 2018 BP6 in today's DOU MPEC along with additional observation of outbound risk-listed 2018 BQ6 and continuing follow-up for inbound 2018 AH12 and departed objects 2018 BE6 and 2018 AJ.

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  36.6 from 38.4 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 267 m  44.39 from 45.69 LD Feb. 28 - March 13 radar/NHATS target
6.9   LD March 10* 2015 DK200 26 m  69.9 from 72.2 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 2 February '18

The MPC's NEO Confirmation Page has 30 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 30 objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of 31 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 2 February '18

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2018-C04 - "14:44 UT" - 2014 YW34

MPEC 2018-C03 - "14:42 UT" - 2010 XP69

<< DOU on 2 Feb. '18 >>  MPEC 2018-C02 - "13:03 UT" - Daily Orbit Update

Observers  on 2 February '18

Seven observers appear in today's MPECs.

CodeObserver / observatory
160Castelmartini Obs. in Italy, 4 in MPEC 2018-C02 -- 2018 BT1, 2018 AJ, 190208, 143992
X31Galilei Obs., 1 in MPEC 2018-C02 -- 505657
J95Great Shefford Obs. in England, 2 in MPEC 2018-C02 -- 2018 BP6, 2018 AQ2
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-C02 -- 2018 BP6
926Tenagra II Obs. in Arizona, 20 in MPEC 2018-C02 -- 2018 BQ6, 2018 BJ5, 2018 BH5, 2018 BE6, 2018 BD6, 2018 AQ2, 2018 AH12, 2017 YS8, 2003 MD7, 85990, 504928, 475967, 475354, 385580, 262623, 225586, 185853, 153349, 140039, 6053
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2018-C02, 2018-C03 & 2018-C04 -- 2014 YW34, 2010 XP69
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2018-C03 -- 2010 XP69
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 February '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the NASA/JPL Sentry and NEODyS CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2018 BQ6NEODyS16102059-207831.69e-08-8.97-9.20NEODyS: "Based on 34 optical observations (of which 3 are rejected as outliers) from 2018-01-27.354 to 2018-01-30.522."
2018 BP6JPL Sentry16102074-207413.778e-08-7.21-7.210JPL: Computed at 07:54 today Pacific time based on 46 observations spanning 5.6997 days (2018-Jan-27.35282 to 2018-Feb-02.052479). Diameter approximately 0.040 km. from weighted mean H=24.61.
NEODyS16102070-207941.33e-07-6.69-7.030NEODyS: "Based on 46 optical observations (of which 3 are rejected as outliers) from 2018-01-27.354 to 2018-02-02.053."
2018 BD6JPL Sentry1610R E M O V E DJPL: Risk listing removed at 1551 UTC today

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale (next 100 years)

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 2 February '18

Times are UTC for when items were noted or added by The Tracking News.

1751Generated Traffic Report
1610Noted that JPL Sentry has removed 2018 BD6 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 BP6 risk assessment - see above
Noted that NEODyS has updated its 2018 BP6 risk assessment - see above
Noted that NEODyS has posted 2018 BQ6 as an impact risk - see above
Grabbed MPEC 2018-C02 - Daily Orbit Update - see above
Grabbed MPEC 2018-C03 - 2010 XP69 - see above
Grabbed MPEC 2018-C04 - 2014 YW34 - see above