Contents  on 4 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 4 January '17

One object reported inside ten LD

There is one asteroid reported moving inside ten lunar distances (LD) of our planet today. NHATS target 2016 YR heads out from 8.18 to 8.43 LD. Next up, risk-listed NHATS target 2016 YC8 comes inside ten LD on January 15th.

This report was generated at 1840 UTC with follow-up in today's DOU MPEC for 2016 YC8 and departed 2016 YF.



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 4 January '17

The MPC's NEO Confirmation Page has 103 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 103 objects listed. Of these, 65 were "one nighters." So far The Tracking News has counted a total of 116 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 4 January '17

Minor Planet Electronic Circulars

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


MPEC 2017-A16 - "22:48 UT" - 2017 AF3


MPEC 2017-A15 - "22:45 UT" - 2017 AE3


MPEC 2017-A14 - "22:41 UT" - 2017 AD3


MPEC 2017-A13 - "22:24 UT" - Comet 71P/Clark


<< DOU on 4 Jan. '17 >>  MPEC 2017-A12 - "13:06 UT" - Daily Orbit Update

Observers  on 4 January '17

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 1 in MPEC 2017-A13 -- 71P
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-A15 -- 2017 AE3
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2017-A15 -- 2017 AE3
T05ATLAS Haleakala in Hawaii, 21 in MPECs 2017-A12 & 2017-A15 -- 2017 AE3, 2009 BB11, 90075, 475665, 468583, 413002, 363814, 35396, 138846, 12538, 11398, 7088, 5836, 5693, 5131, 4179, 3352, 3103, 2102, 1627, 433
300Bisei Spaceguard Center in Japan, 1 in MPEC 2017-A15 -- 2017 AE3
W96Campo Catino Austral Obs. in Chile, 1 in MPEC 2017-A13 -- 71P
160Castelmartini Obs. in Italy, 5 in MPECs 2017-A12 & 2017-A15 -- 2017 AE3, 414960, 357024, 24445, 1627
107Cavezzo Obs. in Italy, 2 in MPEC 2017-A12 -- 2016 NL15, 4179
K65Cesena Obs. in Italy, 1 in MPEC 2017-A15 -- 2017 AE3
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-A15 -- 2017 AE3
J95Great Shefford Obs. in England, 2 in MPECs 2017-A15 & 2017-A16 -- 2017 AF3, 2017 AE3
Q60ISON Siding Spring Obs. in New South Wales, 2 in MPEC 2017-A12 -- 5131, 3838
Q622Marian Urbanik in Slovakia via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A15 -- 2017 AE3
Q625Cristovao Jacques in Brazil via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A15 -- 2017 AE3
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2017-A12 & 2017-A15 -- 2017 AE3, 480004
K92LCOGT Sutherland B in South Africa, 1 in MPEC 2017-A14 -- 2017 AD3
K30Luscherz Obs. in Switzerland, 1 in MPEC 2017-A12 -- 2016 PZ66
K38M57 Obs. in Italy, 2 in MPECs 2017-A12 & 2017-A15 -- 2017 AE3, 2016 UE101
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPECs 2017-A14 & 2017-A16 -- 2017 AF3, 2017 AD3
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-A14 -- 2017 AD3
J69North Obs. in England, 1 in MPEC 2017-A15 -- 2017 AE3
Z80Northolt Branch Obs. in England, 4 in MPEC 2017-A12 -- 2016 YN4, 2016 VY5, 2014 EW24, 2008 UL90
F51Pan-STARRS 1 (PS1) in Hawaii, 24 in MPECs 2017-A12, 2017-A14 & 2017-A16 -- 2017 AF3, 2017 AD3, 2016 YP4, 2016 YF11, 2016 XA21, 2016 UU80, 2015 BN509, 2014 UU34, 2013 VC13, 2013 AX52, 2008 BP16, 2002 AN11, 97725, 54789, 54401, 38086, 331990, 276397, 259221, 23606, 220909, 154269, 144411, 10150
B49Paus Obs. in Spain, 1 in MPEC 2017-A15 -- 2017 AE3
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2017-A12 -- 2016 XD1
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-A15 -- 2017 AE3
Q11Shinshiro Obs., 3 in MPEC 2017-A12 -- 5693, 5653, 1036
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-A13 -- 71P
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2017-A12 & 2017-A15 -- 2017 AE3, 2016 YC8, 2003 CR1
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2017-A15 -- 2017 AE3
I52Steward Obs. Mt. Lemmon Station in Arizona, 7 in MPEC 2017-A12 -- 2016 YZ, 2016 YV8, 2016 YR8, 2016 YF, 2016 YB8, 2013 YT2, 2013 BM76
926Tenagra II Obs. in Arizona, 5 in MPECs 2017-A12, 2017-A14 & 2017-A15 -- 2017 AE3, 2017 AD3, 2016 YU8, 2016 YF11, 2016 YB8
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-A12 -- 2016 YM4, 2016 TZ17
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2016 YC8NEODyS19302045-211522.12e-09-8.84-8.910NEODyS: "Based on 64 optical observations (of which 0 are rejected as outliers) from 2016-12-27.359 to 2017-01-04.470."
2016 YM4NEODyS19302089-209821.65e-08-6.48-6.760NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2016-12-24.192 to 2017-01-04.399."
JPL Sentry1700211214.2e-10-8.15-8.150JPL: "Analysis based on 41 observations spanning 11.206 days (2016-Dec-24.19147 to 2017-Jan-04.39788)." Diameter approximately 0.120 km. from mean, weighted H=22.3.

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 4 January '17

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

2300Grabbed MPEC 2017-A13 - Comet 71P/Clark - see above
Grabbed MPEC 2017-A14 - 2017 AD3 - see above
Grabbed MPEC 2017-A15 - 2017 AE3 - see above
Grabbed MPEC 2017-A16 - 2017 AF3 - see above
1930Noted that NEODyS has updated its 2016 YC8 risk assessment - see above
Noted that NEODyS has updated its 2016 YM4 risk assessment - see above
1840Generated Traffic Report
1700Noted that JPL Sentry has updated its 2016 YM4 risk assessment - see above
Grabbed MPEC 2017-A12 - Daily Orbit Update - see above