Contents  on 13 January '17

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 13 January '17

Two objects reported inside ten LD

Today there are two asteroids reported within ten lunar distances (LD) of our home world. 2017 AJ13 is inbound from 7.56 to 6.80 LD and NHATS target 2017 AZ3 is outbound from 7.67 to 8.93 LD. Coming around next, NHATS target 2016 YC8 enters our ten-LD traffic reporting "bubble" on January 16th.

This report was generated at 1818 UTC with follow-up from late December in today's DOU MPEC for risk-listed 2016 WQ1, adding 22.13 days to its previous 11.90-day observing arc.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting on transient natural objects that approach the actually significant 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 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.

Radar Astrometry  on 13 January '17

Radar observation of two objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 2305 UTC when the database was dated 13 Jan.

Data update noted at 2358 UTC when the database was dated 13 Jan.

NEOCP Activity  on 13 January '17

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, thirteen were "one nighters." So far The Tracking News has counted a total of 54 listings on the NEOCP today.

New MPECs  on 13 January '17

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 2017-A80 - "14:15 UT" - 2011 SR12

<< DOU on 13 Jan. '17 >>  MPEC 2017-A79 - "13:10 UT" - Daily Orbit Update

Observers  on 13 January '17

Nine observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 2 in radar -- 2016 LX48, 433953
160Castelmartini Obs. in Italy, 8 in MPEC 2017-A79 -- 2014 AD17, 96590, 159608, 138846, 5836, 5131, 3352, 1627
Z45Cosmos Obs., 1 in MPEC 2017-A79 -- 85990
253Goldstone DSS-14 70m antenna in southern California, 2 in radar -- 2016 LX48, 433953
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A80 -- 2011 SR12
K92LCOGT Sutherland B in South Africa, 1 in MPEC 2017-A80 -- 2011 SR12
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2017-A79 & 2017-A80 -- 2016 AU8, 2015 YE18, 2011 SR12, 96590, 452389, 152563
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2017-A79 -- 5653
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-A79 -- 2016 WQ1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 January '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL 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 JPL NEO Program Sentry and NEODyS CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2016 WQ1JPL Sentry1712210318.4e-08-8.83-8.830JPL: "Analysis based on 58 observations spanning 34.037 days (2016-Nov-20.40832 to 2016-Dec-24.44531)." Diameter approximately 0.009 km. from mean, weighted H=27.9.
NEODyS17122046-211681.49e-07-8.57-9.050NEODyS: "Based on 60 optical observations (of which 1 are rejected as outliers) from 2016-11-20.409 to 2016-12-24.446."

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 13 January '17

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

2358Noted Radar Astrometry database update - see above
2305Noted Radar Astrometry database update - see above
1818Generated Traffic Report
1712Noted that JPL Sentry has updated its 2016 WQ1 risk assessment - see above
Noted that NEODyS has updated its 2016 WQ1 risk assessment - see above
Grabbed MPEC 2017-A79 - Daily Orbit Update - see above
Grabbed MPEC 2017-A80 - 2011 SR12 - see above