Contents  on 17 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 17 January '17

Two objects reported inside ten LD

There are two asteroids reported flying within ten lunar distances (LD) of our home world today. 2017 AJ13 leaves our ten-LD traffic reporting sphere, traveling out from 9.06 to 10.80 LD, and NHATS target 2016 YC8 is inbound from 9.64 to 9.48 LD.

This report was generated at 2154 UTC with the discovery announced late yesterday of already departed 2017 AP19 (MPEC), which flew past us at 3.35 LD on January 6th, and with follow-up in today's DOU MPEC for departed NHATS target 2017 AG5.

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.

NEOCP Activity  on 17 January '17

The MPC's NEO Confirmation Page has 34 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 34 objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of 41 listings on the NEOCP today.

New MPECs  on 17 January '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2017-B07 - "14:35 UT" - 2017 AT19

<< DOU on 17 Jan. '17 >>  MPEC 2017-B06 - "13:02 UT" - Daily Orbit Update

MPEC 2017-B05 - "00:00 UT" - 2017 AQ19

Observers  on 17 January '17

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 6 in MPEC 2017-B06 -- 96590, 452389, 378610, 4179, 3200, 1627
160Castelmartini Obs. in Italy, 5 in MPEC 2017-B06 -- 481904, 470510, 378610, 7088, 1620
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2017-B05, 2017-B06 & 2017-B07 -- 2017 AT19, 2017 AQ19, 2016 YF8, 2016 PZ66
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-B05 -- 2017 AQ19
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 8 in MPEC 2017-B06 -- 2017 AK3, 2016 YW7, 2016 YB11, 2016 XG18, 2016 XC24, 2016 WP, 2016 VL3, 2016 EE156
W86LCOGT Cerro Tololo B in Chile, 2 in MPECs 2017-B05 & 2017-B06 -- 2017 AQ19, 192559
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2017-B06 -- 192559
K92LCOGT Sutherland B in South Africa, 1 in MPEC 2017-B06 -- 2011 SR12
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-B05 -- 2017 AQ19
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-B07 -- 2017 AT19
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-B06 -- 96590
F51Pan-STARRS 1 (PS1) in Hawaii, 14 in MPECs 2017-B05 & 2017-B06 -- 2017 AQ19, 2017 AG5, 2016 RU, 2015 BY310, 2015 BA92, 2011 SR12, 470594, 467609, 454094, 385343, 355046, 232382, 171576, 138175
D29Purple Mtn. Obs. Xuyi Station in China, 8 in MPEC 2017-B06 -- 2016 XD1, 2014 AD17, 480984, 229007, 22753, 163249, 5836, 3352
G40%program code "%" (14) via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-B06 -- 2016 YT8
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-B07 -- 2017 AT19
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-B07 -- 2017 AT19
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-B07 -- 2017 AT19
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-B06 -- 2016 TT19, 2016 NQ32
C51WISE in Earth polar orbit, 6 in MPEC 2017-B06 -- 2016 SH45, 2016 QC84, 480004, 370307, 20460, 3352
I15Wishing Star Obs. in Rhode Island, 4 in MPEC 2017-B06 -- 2016 XD1, 2016 QN11, 378610, 155140
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 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
2017 AK3JPL Sentry16402048-208121.3e-07-6.80-7.010JPL: "Analysis based on 15 observations spanning 14.963 days (2017-Jan-02.46805 to 2017-Jan-17.43152)." Diameter approximately 0.040 km. from mean, weighted H=24.7.

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 17 January '17

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

2154Generated Traffic Report
1640Noted that JPL Sentry has updated its 2017 AK3 risk assessment - see above
Grabbed MPEC 2017-B06 - Daily Orbit Update - see above
Grabbed MPEC 2017-B07 - 2017 AT19 - see above
0038Grabbed MPEC 2017-B05 - 2017 AQ19 - see above