Contents  on 29 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 29 January '18

Ten objects reported inside ten LD

There are ten minor objects reported flying inside ten lunar distances (LD) of Earth today. Nearest is 2018 BE6, which slides in from 6.27 to 3.69 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  4.66 to 5.14 LD Dec. 30 - Feb. 9 intruder, NHATS target, risk
3.01 LD Jan. 24 2018 BA3 20 m  7.96 to 9.64 LD Jan. 19 - 30
3.06 LD Jan. 27 2018 BU1 41 m  5.48 to 7.72 LD Jan. 23 - 30
3.07 LD Jan. 23 2018 BJ6 7 m  5.19 to 5.87 LD Jan. 12 - Feb. 4 NHATS target
3.40 LD tomorrow 2018 BE6 43 m  3.69 from 6.27 LD Jan. 27 - Feb. 1 DOU
4.65 LD Jan. 23 2018 AJ 42 m  8.24 to 9.28 LD Jan. 16 - 30 NHATS target
4.83 LD Jan. 26 2018 BM5 11 m  7.27 to 8.90 LD Jan. 22 - 30
5.31 LD Feb. 4 2018 AH12 14 m  8.24 from 9.14 LD yesterday - Feb. 12 NHATS target
6.7   LD Jan. 15* 2018 AV2 6 m  7.0 to 7.0 LD Nov. 10 - March 2 EPU +/- 9 mins.*, NHATS target, natural?
9.27 LD Jan. 27 2018 BQ 26 m  9.33 to 9.44 LD Jan. 22 - Feb. 1 NHATS target - DOU

This report was generated at 1840 UTC with first follow-up for inbound 2018 BE6 in today's DOU MPEC along with continuing follow-up for outbound 2018 BQ and departed objects 2018 BH3 and 2018 AA4, plus astrometry from two weeks ago for departed 2018 AG4.

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  44.1 from 46.1 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 269 m  49.58 from 50.87 LD Feb. 28 - March 13 radar/NHATS target
6.9   LD March 10* 2015 DK200 26 m  79.5 from 82.0 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 29 January '18

The MPC's NEO Confirmation Page has 36 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 36 objects listed. Of these, six were "one nighters." So far The Tracking News has counted a total of 40 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 29 January '18

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.


<< DOU on 29 Jan. '18 >>  MPEC 2018-B158 - "13:13 UT" - Daily Orbit Update


MPEC 2018-B157 - "12:45 UT" - 2014 QW432

Observers  on 29 January '18

Eleven observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2018-B158 -- 2018 BQ, 2018 BP, 2018 BH3, 2018 AW, 2018 AA4, 2017 YR1, 2017 UW42
160Castelmartini Obs. in Italy, 3 in MPEC 2018-B158 -- 2018 BE6, 53110, 348314
703Catalina Sky Survey (CSS) in Arizona, 21 in MPEC 2018-B158 -- 2016 BA39, 2008 DG17, 96590, 475967, 374851, 36284, 337228, 307493, 281365, 194126, 185853, 17511, 16657, 152931, 137805, 137052, 6455, 6053, 1981, 1866, 1864
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-B158 -- 2018 AG4
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-B158 -- 2018 BE6
G96Mt. Lemmon Survey (MLS) in Arizona, 16 in MPEC 2018-B158 -- 2014 VM, 2000 YG29, 504034, 504025, 459386, 36284, 361861, 325395, 275976, 242708, 172034, 162998, 162566, 101873, 1980, 1864
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-B158 -- 2017 TQ3
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2018-B158 -- 2018 BM3, 2017 VO15, 2014 YY43
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPEC 2018-B158 -- 2018 BP5, 25916
926Tenagra II Obs. in Arizona, 1 in MPEC 2018-B157 -- 2014 QW432
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-B158 -- 2018 AY, 2018 AT
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 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 BN6NEODyS17002073-2117652.19e-05-5.75-6.170NEODyS: "Based on 41 optical observations (of which 2 are rejected as outliers) from 2018-01-27.195 to 2018-01-28.327."
2018 BP3NEODyS1700211515.43e-07-8.48-8.480NEODyS: "Based on 41 optical observations (of which 1 are rejected as outliers) from 2018-01-22.361 to 2018-01-28.470."
2018 BPJPL Sentry17002068-206813.864e-10-7.40-7.400JPL: Computed at 07:58 today Pacific time based on 69 observations spanning 11.970 days (2018-Jan-16.15431 to 2018-Jan-28.12422). Diameter approximately 0.260 km. from weighted mean H=20.53.
2018 AB12NEODyS17002097-211527.16e-09-8.29-8.290NEODyS: "Based on 52 optical observations (of which 0 are rejected as outliers) from 2018-01-14.378 to 2018-01-28.306."
2018 AE4NEODyS1700211014.2e-08-7.42-7.420NEODyS: "Based on 66 optical observations (of which 5 are rejected as outliers) from 2018-01-13.463 to 2018-01-28.373."

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 29 January '18

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

1840Generated Traffic Report
1700Noted that NEODyS has reposted 2018 AB12 as an impact risk - see above
Noted that NEODyS has updated its 2018 AE4 risk assessment - see above
Noted that NEODyS has posted 2018 BN6 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 BP risk assessment - see above
Noted that NEODyS has reposted 2018 BP3 as an impact risk - see above
Grabbed MPEC 2018-B157 - 2014 QW432 - see above
Grabbed MPEC 2018-B158 - Daily Orbit Update - see above