Contents  on 22 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 22 January '17

One object reported inside ten LD

One asteroid is reported to be within ten lunar distances (LD) of Earth today. Newly announced intruder 2017 BX is inbound from 5.30 to 3.68 LD.

Earth passage I D ~Size Distance Today  Notes
0.69 LD Jan. 252017 BX 8 m  3.68 from 5.29 LD intruder - MPEC, DOU
4.6   LD Feb. 162017 BW 75 m  < 10 LD Feb. 9, uncertainty +/- 6.2500 hours - DOU
7.10 LD Feb. 52013 FK 74 m  < 10 LD Feb. 2
9.1   LD Feb. 42005 VL1 13 m  < 10 LD Feb. 1, uncertainty +/- 15.0000 hours, NHATS target, risk

This report was updated at 1852 UTC with today's DOU MPEC carrying additional observation of 2017 BX and approaching 2017 BW, plus follow-up for departed NHATS target 2017 AG5 and astrometry from November for 2016 SJ35. Your first A/CC neighborhood asteroid traffic report was generated at 0548 UTC with the discoveries announced late yesterday of 2017 BX (MPEC) and already departed 2017 BY (MPEC), which flew by our planet at about 5.3 LD* on January 8th.

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. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 22 January '17

The MPC's NEO Confirmation Page has 55 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 55 objects listed. Of these, sixteen were "one nighters." So far The Tracking News has counted a total of 58 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 22 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.

<< DOU on 22 Jan. '17 >>  MPEC 2017-B41 - "13:02 UT" - Daily Orbit Update

MPEC 2017-B40 - "04:19 UT" - 2016 BJ81

MPEC 2017-B39 - "03:51 UT" - 2016 MH1

Observers  on 22 January '17

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 15 in MPEC 2017-B41 -- 2016 PR8, 2005 TF, 97725, 349507, 347813, 275611, 262623, 252558, 226198, 203471, 153201, 10115, 5653, 3691, 2102
V03Big Water Obs. in Utah, 1 in MPEC 2017-B41 -- 2016 XD1
160Castelmartini Obs. in Italy, 12 in MPEC 2017-B41 -- 96590, 85990, 85804, 66146, 452389, 378610, 347813, 5653, 4179, 3352, 887, 433
107Cavezzo Obs. in Italy, 4 in MPEC 2017-B41 -- 85990, 203471, 138846, 5693
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-B41 -- 2016 UW41
246KLENOT in the Czech Republic, 21 in MPEC 2017-B41 -- 2017 BW, 2017 BK, 2017 AZ13, 2017 AO13, 2017 AK3, 2017 AG5, 2017 AF5, 2016 YN4, 2016 WX9, 2016 VY3, 2016 QN11, 2016 PR8, 2016 LM8, 2015 ME54, 2014 AD17, 2012 BX13, 2011 WO41, 2006 OH15, 2005 TF, 96590, 481904
Z87Laver Obs. in England, 1 in MPEC 2017-B41 -- 4179
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-B41 -- 2017 BX
K38M57 Obs. in Italy, 1 in MPEC 2017-B41 -- 443103
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-B41 -- 5693
Z80Northolt Branch Obs. in England, 2 in MPEC 2017-B41 -- 2017 AF5, 2016 PR8
G34Oberfrauendorf Obs. in Germany, 3 in MPEC 2017-B41 -- 138846, 5693, 2102
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2017-B41 -- 433953, 1221
D29Purple Mtn. Obs. Xuyi Station in China, 19 in MPEC 2017-B41 -- 2017 AF5, 2016 YV8, 2016 YU8, 2016 VY3, 2016 UE101, 2016 PR8, 2015 ME54, 2014 EW24, 2011 WO41, 2010 CM44, 481904, 351545, 349507, 307070, 25916, 252558, 226198, 203471, 5693
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-B41 -- 2017 AP20
W885M. Kumrucu-Lohmiller in Massachusetts via Chile Obs. in Chile, 1 in MPEC 2017-B41 -- 2014 MP41
461SZTE Asteroid Program in Hungary, 1 in MPEC 2017-B40 -- 2016 BJ81
926Tenagra II Obs. in Arizona, 3 in MPECs 2017-B39 & 2017-B41 -- 2017 AR4, 2017 AD5, 2016 MH1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-B41 -- 2016 SJ35
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 AD5NEODyS1645207612.12e-09-8.37-8.370NEODyS: "Based on 79 optical observations (of which 0 are rejected as outliers) from 2017-01-04.494 to 2017-01-22.531."
2017 AK3JPL Sentry1645208118.4e-08-7.09-7.090JPL: "Analysis based on 23 observations spanning 19.485 days (2017-Jan-02.46805 to 2017-Jan-21.95354)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
NEODyS16452054-208261.68e-07-6.76-7.060NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2017-01-02.469 to 2017-01-21.954."
2016 SJ35JPL Sentry1645208614.9e-09-8.28-8.280JPL: "Analysis based on 74 observations spanning 42.600 days (2016-Sep-28.53568 to 2016-Nov-10.135427)." Diameter approximately 0.040 km. from mean, weighted H=24.6.

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 22 January '17

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

1852Updated Traffic Report
1645Noted that JPL Sentry has updated its 2016 SJ35 risk assessment - see above
Noted that NEODyS has posted 2017 AD5 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 AK3 risk assessment - see above
Noted that NEODyS has updated its 2017 AK3 risk assessment - see above
Grabbed MPEC 2017-B41 - Daily Orbit Update - see above
0510Grabbed MPEC 2017-B39 - 2016 MH1 - see above
Grabbed MPEC 2017-B40 - 2016 BJ81 - see above