Contents  on 27 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 27 January '18

Nine objects reported inside ten LD

Today nine planetesimals are reported within ten lunar distances (LD) of Earth. Nearest are 2018 BU1, which comes its closest to our planet on this passage, reaching 3.06 LD at 0459 UTC, and risk-listed intruder 2018 BC, outbound from 3.70 to 4.18 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 BX 5 m  8.95 to 10.20 LD Jan. 12 - 27 intruder, NHATS target, exits ten LD
0.73 LD Jan. 19 2018 BC 4 m  3.70 to 4.18 LD Dec. 30 - Feb. 9 intruder, NHATS target, risk
3.01 LD Jan. 24 2018 BA3 20 m  4.83 to 6.34 LD Jan. 19 - 30
3.06 LD today 2018 BU1 41 m  3.06 LD Jan. 23 - 30 Earth closest at 0459 UTC - DOU
4.65 LD Jan. 23 2018 AJ 42 m  6.35 to 7.25 LD Jan. 16 - 30 NHATS target - DOU
4.83 LD yesterday 2018 BM5 11 m  5.01 to 5.90 LD Jan. 22 - 30
6.7   LD Jan. 15* 2018 AV2 6 m  6.9 to 6.9 LD Nov. 10 - March 2 EPU +/- 9 mins.*, NHATS target, natural? - DOU
8.10 LD yesterday 2018 AL12 36 m  9.02 to 11.65 LD Jan. 24 - 27 exits ten LD
9.27 LD today 2018 BQ 26 m  9.27 LD Jan. 22 - Feb. 1 NHATS target, Earth closest at 1456 UTC

This report was generated at 1840 UTC with today's DOU MPEC posting first follow-up for departed objects 2018 BQ5 and 2018 BF5 along with continuing follow-up for passing 2018 BU1, outbound objects 2018 AV2 and 2018 AJ, and departed risk-listed 2018 BP3.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
5.31 LD Feb. 4 2018 AH12 14 m  10.10 from 11.09 LD tomorrow - Feb. 12 NHATS target
3.7   LD Feb. 24* 2017 DR109 10 m  48.1 from 50.1 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 269 m  52.16 from 53.45 LD Feb. 28 - March 13 radar/NHATS target
6.9   LD March 10* 2015 DK200 26 m  84.5 from 87.1 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. 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 27 January '18

The MPC's NEO Confirmation Page has 51 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 51 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 77 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 27 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.


MPEC 2018-B143 - "22:03 UT" - 2017 XO2


<< DOU on 27 Jan. '18 >>  MPEC 2018-B142 - "13:07 UT" - Daily Orbit Update

Observers  on 27 January '18

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2018-B142 -- 2018 AZ11, 2018 AK3, 2017 WK28, 2016 CA138, 2008 CA5, 159609
T05ATLAS Haleakala in Hawaii, 4 in MPEC 2018-B142 -- 96590, 475967, 17511, 1864
160Castelmartini Obs. in Italy, 7 in MPEC 2018-B142 -- 2018 BU1, 2018 AJ, 2009 QL8, 507366, 505667, 190208, 162011
703Catalina Sky Survey (CSS) in Arizona, 19 in MPEC 2018-B142 -- 2017 XH62, 2016 CL32, 2014 BS32, 2009 QL8, 2004 BB, 68278, 496861, 439908, 322763, 27346, 267221, 259802, 190208, 17511, 162011, 137925, 137805, 7977, 6053
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 20 in MPEC 2018-B142 -- 2018 BL3, 2018 BK3, 2018 BB, 2018 AN3, 2018 AL18, 2018 AH13, 2018 AG12, 2018 AE13, 2018 AD12, 2018 AC12, 2017 YU7, 2017 YQ3, 2017 YL6, 2017 YK8, 2017 YG7, 2017 YB8, 2017 YA2, 2017 XG62, 2017 WA13, 2017 UE45
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPEC 2018-B142 -- 2017 VO15, 2014 WG365, 2014 BS32, 2000 BL19, 262623, 177255, 17511, 174881, 143651, 6053, 1981
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2018-B142 -- 2003 CN17, 142348
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2018-B142 & 2018-B143 -- 2018 BL1, 2017 XO2, 2015 BN509, 2009 CS5, 190208
587Sormano Obs. in Italy, 1 in MPEC 2018-B142 -- 2018 BE5
691Spacewatch 0.9m telescope in Arizona, 18 in MPEC 2018-B142 -- 2018 BP1, 2018 BL1, 2018 BK3, 2018 BK1, 2018 BG3, 2018 BG1, 2018 AV2, 2018 AM13, 2018 AM12, 2018 AJ, 2018 AF3, 2017 YS8, 2017 YQ3, 2017 YM6, 2017 YF7, 2017 XB2, 2007 PV27, 2006 AL4
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2018-B142 -- 2018 BP3, 2018 BM3, 2018 BE3, 2013 OM9
I52Steward Obs. Mt. Lemmon Station in Arizona, 16 in MPEC 2018-B142 -- 2018 BZ2, 2018 BQ5, 2018 BQ1, 2018 BP5, 2018 BL3, 2018 BK5, 2018 BK3, 2018 BJ5, 2018 BJ3, 2018 BF5, 2018 AW, 2018 AM12, 2018 AJ12, 2018 AJ, 2018 AD4, 2017 YC8
926Tenagra II Obs. in Arizona, 10 in MPEC 2018-B142 -- 2011 EB7, 504928, 497094, 326354, 259802, 225586, 190208, 162011, 154652, 6053
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-B142 -- 2018 AE2
I15Wishing Star Obs. in Rhode Island, 4 in MPEC 2018-B142 -- 2018 AQ2, 36284, 228587, 154347
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 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 BP3JPL Sentry17052115-211522.0222e-07-8.92-9.100JPL: Computed at 08:46 today Pacific time based on 37 observations spanning 4.8172 days (2018-Jan-22.36003 to 2018-Jan-27.17728). Diameter approximately 0.006 km. from weighted mean H=28.73.

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 27 January '18

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

2206Grabbed MPEC 2018-B143 - 2017 XO2 - see above
1840Generated Traffic Report
1705Noted that JPL Sentry has updated its 2018 BP3 risk assessment - see above
1638Grabbed MPEC 2018-B142 - Daily Orbit Update - see above