Contents  on 12 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 12 January '18

No objects reported inside ten LD

No minor objects are confirmed to be traveling within ten lunar distances (LD) of our planet today. Next known is 2018 AJ, which comes inside ten LD on or about January 16th.

This report was generated at 2139 UTC with follow-up for departed 2017 YW3 in today's DOU MPEC along with astrometry from December, October, and March for 23 other objects, including risk-listed 2017 YM1, first follow-up for objects 2017 YN1, risk-listed 2017 YD1, and Moon-buzzing 2017 YJ1, and additional observation for objects 2017 CF32, 2017 WJ16 (which lives mostly inside Earth's orbit), intruder 2017 UR2, and risk-listed 2017 TW5.

Reading:  Lawrence Berkeley National Lab has a news release telling about a new science paper on finding "[direct] evidence of complex prebiotic chemistry from a water-rich world in the outer solar system" in two meteorites, and proposing that these two may have both come to Earth from "plausibly" 1 Ceres via another body, "possibly" 6 Hebe, which would show that solar system dynamics "facilitated material exchanges between different asteroidal bodies in the early solar system."

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. "Moon buzzing" is used here to describe an object that recently passed the Moon at less than one Earth-Moon distance but did not intrude into the Earth-Moon system. 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 12 January '18

The MPC's NEO Confirmation Page has 76 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 76 objects listed. Of these, 36 were "one nighters." So far The Tracking News has counted a total of 80 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 12 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 12 Jan. '18 >>  MPEC 2018-A44 - "13:04 UT" - Daily Orbit Update

Observers  on 12 January '18

Seventeen observers appear in today's MPEC.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 9 in MPEC 2018-A44 -- 96189, 265196, 243566, 209924, 16834, 2329, 1865, 1685, 1036
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2018-A44 -- 2007 AG, 53110, 348314, 8037
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-A44 -- 2017 SL33
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 24 in MPEC 2018-A44 -- 2017 YZ1, 2017 YU3, 2017 YS3, 2017 YN6, 2017 YM1, 2017 YJ1, 2017 YD1, 2017 YC2, 2017 XZ1, 2017 WX13, 2017 WJ16, 2017 WE13, 2017 VW13, 2017 VV13, 2017 VV, 2017 VD14, 2017 UE43, 2014 PL51, 2014 BR8, 2012 GA5, 2010 XD11, 2009 WR25, 2006 YP, 216985
K91LCO Sutherland A in South Africa, 1 in MPEC 2018-A44 -- 2017 SL33
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-A44 -- 11405
711McDonald Obs. in Texas, 3 in MPEC 2018-A44 -- 2017 YU3, 2017 XC2, 2017 WU13
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPEC 2018-A44 -- 2017 RV1, 2014 BS32, 2011 AW55, 2004 VC17, 497176, 337069, 144898, 144861, 8201, 5189
204Schiaparelli Obs. in Italy, 31 in MPEC 2018-A44 -- 2017 YQ1, 2017 YN1, 2017 XV2, 2017 XS, 2017 XR60, 2017 XR2, 2017 XG62, 2017 XD, 2017 WZ14, 2017 VX1, 2017 VR12, 2017 VB, 2017 UU1, 2017 UR2, 2017 UQ2, 2017 UE, 2017 UD, 2017 TZ5, 2017 TX5, 2017 TW5, 2017 TV5, 2017 TU5, 2017 TQ5, 2017 TL4, 2017 TG4, 2017 TC4, 2017 SQ11, 2017 QQ32, 2017 QJ18, 2014 QW296, 2009 BL71
W885M. Kumrucu-Lohmiller in Massachusetts via Chile Obs. in Chile, 1 in MPEC 2018-A44 -- 2017 TS3
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-A44 -- 2017 SS19
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2018-A44 -- 2017 YT5, 2017 YO6, 2017 OP19, 2015 CV13
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2018-A44 -- 3122
I52Steward Obs. Mt. Lemmon Station in Arizona, 10 in MPEC 2018-A44 -- 2017 YW3, 2017 YU3, 2017 YK5, 2017 YJ7, 2017 YG1, 2017 YF7, 2017 YE5, 2017 YD, 2017 YC8, 2017 VV14
926Tenagra II Obs. in Arizona, 3 in MPEC 2018-A44 -- 2016 CW31, 2015 SY16, 2012 DG61
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPEC 2018-A44 -- 2017 YZ1, 2017 FB3, 2017 CF32, 2015 GG1
C51WISE in Earth polar orbit, 5 in MPEC 2018-A44 -- 2017 UR7, 2017 SL33, 413820, 345705, 333888
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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.





Notes for Today's Latest Risk Assessments
2017 YO6JPL Sentry1700R E M O V E DJPL: Risk listing removed at 1654 UTC today
2017 YZ1JPL Sentry17002047-204711.505e-06-3.31-3.310JPL: Computed at 08:55 today Pacific time based on 66 observations spanning 20.148 days (2017-Dec-20.42481 to 2018-Jan-09.572745). Diameter approximately 0.290 km. from weighted mean H=20.37.
2017 YM1JPL Sentry17002048-2103182.76354256e-05-4.82-5.010JPL: Computed at 08:45 today Pacific time based on 29 observations spanning 16.033 days (2017-Dec-20.40891 to 2018-Jan-05.44143). Diameter approximately 0.031 km. from weighted mean H=25.16.
2017 YD1JPL Sentry17002102-211733.589243e-06-8.33-8.430JPL: Computed at 08:57 today Pacific time based on 29 observations spanning 10.006 days (2017-Dec-20.24585 to 2017-Dec-30.25154). Diameter approximately 0.003 km. from weighted mean H=30.00.
2017 VW13JPL Sentry17002097-209714.429e-09-6.48-6.480JPL: Computed at 07:57 today Pacific time based on 262 observations spanning 53.762 days (2017-Nov-13.64011 to 2018-Jan-06.40207). Diameter approximately 0.250 km. from weighted mean H=20.62.
2017 UE43JPL Sentry1730R E M O V E DJPL: Risk listing removed at 1728 UTC today
NEODyS1700R E M O V E D-
2017 TW5JPL Sentry17002072-211554.85791e-06-6.28-6.360JPL: Computed at 07:56 today Pacific time based on 28 observations spanning 1.8593 days (2017-Oct-15.3166 to 2017-Oct-17.17594). Diameter approximately 0.013 km. from weighted mean H=27.06.
2010 DG77JPL Sentry17002019-21175727.3884034e-06-4.82-6.270JPL: Computed at 09:40 April 7th of 2017 Pacific time based on 10 observations spanning .59543 days (2010-Feb-19.17573 to 2010-Feb-19.77116). Diameter approximately 0.044 km. from weighted mean H=24.47.

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 12 January '18

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

2139Generated Traffic Report
1730Noted that JPL Sentry has removed 2017 UE43 as an impact risk - see above
1700Noted that JPL Sentry has updated its 2010 DG77 risk assessment - see above
Noted that JPL Sentry has updated its 2017 TW5 risk assessment - see above
Noted that NEODyS has removed 2017 UE43 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 VW13 risk assessment - see above
Noted that JPL Sentry has updated its 2017 YD1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 YM1 risk assessment - see above
Noted that JPL Sentry has removed 2017 YO6 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 YZ1 risk assessment - see above
Grabbed MPEC 2018-A44 - Daily Orbit Update - see above