Contents  on 10 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 10 January '18

No objects reported inside ten LD

Although some tentative possibilities appear on NASA/JPL's Scout NEOCP Hazard Assessment page, there currently are no formally announced transient natural objects within ten lunar distances (LD) of our home world today. What we do know is that 2018 AJ will come inside ten LD on or about January 16th.

This report was generated at 1822 UTC with follow-up in today's DOU MPEC for departed 2006 XY.

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 10 January '18

The MPC's NEO Confirmation Page has 50 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 50 objects listed. Of these, 31 were "one nighters." So far The Tracking News has counted a total of 51 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 10 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 10 Jan. '18 >>  MPEC 2018-A38 - "13:36 UT" - Daily Orbit Update

Observers  on 10 January '18

Four observers appear in today's MPEC.

CodeObserver / observatory
T08ATLAS Mauna Loa in Hawaii, 9 in MPEC 2018-A38 -- 68950, 399611, 311554, 294739, 209924, 16834, 11405, 2329, 1036
C23Olmen Obs. in Belgium, 1 in MPEC 2018-A38 -- 1999 AF4
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPEC 2018-A38 -- 2017 XR60, 2015 BW510, 2014 JN57, 2006 XY, 96590, 88188, 495960, 331792, 329520, 241370, 137052, 6053
W33Transit Dreams Obs., 6 in MPEC 2018-A38 -- 2017 YP4, 1999 AF4, 96590, 190208, 153349, 7977
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 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 YO6NEODyS1646R E M O V E D-
2017 FD3NEODyS16462053-206323.59e-08-8.65-8.680NEODyS: "Based on 37 optical observations (of which 1 are rejected as outliers) from 2017-03-19.440 to 2017-04-01.417."
2010 DG77JPL Sentry19002018-21175747.3890985e-06-4.78-5.930JPL: 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.
2005 NX55NEODyS16462019-21081873.52e-08-5.36-6.450NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2005-07-11.164 to 2005-07-12.298."

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 10 January '18

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

1900Noted that JPL Sentry has updated its 2010 DG77 risk assessment - see above
1822Generated Traffic Report
1646Noted that NEODyS has updated its 2005 NX55 risk assessment - see above
Noted that NEODyS has updated its 2017 FD3 risk assessment - see above
Noted that NEODyS has removed 2017 YO6 as an impact risk - see above
Grabbed MPEC 2018-A38 - Daily Orbit Update - see above