Contents  on 31 January '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 31 January '18

Eight objects reported inside ten LD

There are eight minor planets reported within ten lunar distances (LD) of Earth today. Nearest is 2018 BQ6, which moves out from 3.67 to 4.67 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  5.61 to 6.09 LD Dec. 30 - Feb. 9 intruder, NHATS target, risk - DOU
3.07 LD Jan. 23 2018 BJ6 7 m  6.59 to 7.32 LD Jan. 12 - Feb. 4 NHATS target
3.40 LD yesterday 2018 BE6 44 m  4.15 to 7.08 LD Jan. 27 - Feb. 1 DOU
3.60 LD yesterday 2018 BQ6 12 m  3.67 to 4.67 LD Jan. 26 - Feb. 3
5.31 LD Feb. 4 2018 AH12 14 m  6.67 from 7.41 LD Jan. 28 - Feb. 12 NHATS target
6.7   LD Jan. 15* 2018 AV2 6 m  7.0 to 7.1 LD Nov. 10 - March 2 EPU +/- 9 mins.*, NHATS target, natural?
7.21 LD Jan. 28 2018 BS6 37 m  9.74 to 11.55 LD Jan. 25 - 31 exits ten LD
9.27 LD Jan. 27 2018 BQ 26 m  9.62 to 9.85 LD Jan. 22 - Feb. 1 NHATS target

This report was generated at 2054 UTC with follow-up in today's DOU MPEC for outbound 2018 BE6 and distant 208023 1999 AQ10 along with astrometry from earlier in the month for two intruders: outbound risk-listed 2018 BC and departed 2018 BF3.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
3.65 LD Feb. 5 2018 BP6 40 m  14.12 from 17.14 LD Feb. 2 - 8 risk
3.7   LD Feb. 24* 2017 DR109 10 m  40.3 from 42.2 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 267 m  46.99 from 48.29 LD Feb. 28 - March 13 radar/NHATS target
6.9   LD March 10* 2015 DK200 26 m  74.6 from 77.1 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. "Distant" is used here to describe an object that has approached Earth within ten LD since A/CC began these traffic reports eleven years ago but is not currently coming so close. 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 January '18

The MPC's NEO Confirmation Page has 32 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 32 objects listed. Of these, six 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 January '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.


<< DOU on 31 Jan. '18 >>  MPEC 2018-B167 - "13:16 UT" - Daily Orbit Update

Observers  on 31 January '18

Fourteen observers appear in today's MPEC.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 17 in MPEC 2018-B167 -- 2018 AQ2, 2008 DG17, 96590, 374851, 36284, 208023, 17511, 163696, 154347, 152931, 137062, 137052, 11066, 3122, 1981, 1866, 1864
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2018-B167 -- 2017 SR32, 333888
E94Gisborne Obs. in New Zealand, 1 in MPEC 2018-B167 -- 2018 BT6
585Kiev Comet Station in Ukraine, 1 in MPEC 2018-B167 -- 3200
168Kourovskaya Obs. in Russia, 1 in MPEC 2018-B167 -- 3200
K74Muensterschwarzach Obs. in Germany, 3 in MPEC 2018-B167 -- 333888, 154347, 3122
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2018-B167 -- 6053
Z80Northolt Branch Obs. in England, 2 in MPEC 2018-B167 -- 2018 BE6, 2018 AQ2
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2018-B167 -- 153349
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2018-B167 -- 2018 BJ3, 2016 BA39, 2011 BM24, 237805
204Schiaparelli Obs. in Italy, 4 in MPEC 2018-B167 -- 2018 BF3, 2018 BC, 2018 AM13, 2015 BS509
926Tenagra II Obs. in Arizona, 13 in MPEC 2018-B167 -- 2018 BH6, 2018 AQ2, 85990, 504928, 475967, 475354, 244977, 225586, 190208, 185853, 162011, 153349, 2202
Z52The Studios Obs., 2 in MPEC 2018-B167 -- 154347, 3122
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-B167 -- 2017 YE5, 2017 WN28
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 January '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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2018 BCJPL Sentry17002083-2109225.4274e-05-6.84-7.710JPL: Computed at 08:12 today Pacific time based on 59 observations spanning 3.2932 days (2018-Jan-17.21005 to 2018-Jan-20.503299). Diameter approximately 0.004 km. from weighted mean H=29.44.

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 31 January '18

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

2054Generated Traffic Report
1700Noted that JPL Sentry has updated its 2018 BC risk assessment - see above
Grabbed MPEC 2018-B167 - Daily Orbit Update - see above