Contents  on 10 January '17

Asteroid/Comet Connection (A/CC) Resources:

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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 '17

Five objects reported inside ten LD

There are five small Solar-System objects reported inside ten lunar distances (LD) of Earth today. Nearest is intruder 2017 AG13, which exits Earth's SOI as it moves away from 1.72 to 5.17 LD. Much further out, NHATS target 2016 YR leaves our ten-LD traffic reporting sphere, slipping off from 9.90 to 10.23 LD. Tomorrow 2017 AJ13 will enter the sphere.

Earth passage I D ~Size Distance Today  Notes
0.54 LD yesterday2017 AG13 21 m  1.72 to 5.17 LD exits Earth SOI, intruder - DOU
1.29 LD Jan. 72017 AZ3 3 m  3.93 to 5.16 LD NHATS target
1.46 LD Jan. 82017 AS4 16 m  5.54 to 9.60 LD risk
2.81 LD Jan. 62017 AF13 17 m  6.94 to 8.41 LD NHATS target - DOU
7.16 LD Dec. 272016 YR 12 m  9.90 to 10.23 LD NHATS target, exits ten LD
Approaching
6.71 LD Jan. 142017 AJ13 50 m  < 10 LD tomorrow - 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
9.46 LD Jan. 182016 YC8 41 m  < 10 LD Jan. 16, NHATS target

This report was generated at 1955 UTC with first follow-up for 2017 AF13 and additional observation of 2017 AJ13 in today's DOU MPEC, along with follow-up for 2017 AG13 and three departed objects: 2017 AK13, 2017 AO4, and 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 10 January '17

The MPC's NEO Confirmation Page has 68 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 68 objects listed. Of these, 31 were "one nighters." So far The Tracking News has counted a total of 74 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 '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-A73 - "14:15 UT" - 2013 GL8


<< DOU on 10 Jan. '17 >>  MPEC 2017-A72 - "13:06 UT" - Daily Orbit Update

Observers  on 10 January '17

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2017-A72 -- 2017 AL4, 2017 AG3, 2016 YL3, 2016 VP4, 2016 EE156, 2013 ET9, 2013 DQ9, 2013 AB53, 2003 WU153, 455659, 363790
T05ATLAS Haleakala in Hawaii, 8 in MPEC 2017-A72 -- 2016 YN4, 2005 TF, 89830, 347813, 275611, 262623, 203471, 5653
703Catalina Sky Survey (CSS) in Arizona, 14 in MPEC 2017-A72 -- 2016 VY3, 2015 ME54, 2014 AD17, 2011 WO41, 2009 BB11, 2003 LX5, 87684, 310842, 25916, 153951, 5693, 1862, 887, 433
Z45Cosmos Obs., 1 in MPEC 2017-A72 -- 2017 AG5
Q60ISON Siding Spring Obs. in New South Wales, 1 in MPEC 2017-A72 -- 1036
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2017-A72 -- 2016 PQ39
G96Mt. Lemmon Survey (MLS) in Arizona, 28 in MPECs 2017-A72 & 2017-A73 -- 2017 AG13, 2016 YZ10, 2016 YE11, 2016 LM8, 2013 GL8, 2012 BX13, 2011 BH10, 2010 AH30, 96315, 88213, 53319, 467609, 42286, 40329, 361532, 34613, 330825, 297418, 260141, 22753, 226554, 159923, 141498, 6456, 5879, 2329, 1943, 1864
566NEAT's GEODSS Haleakala telescope in Hawaii, 1 in MPEC 2017-A73 -- 2013 GL8
J69North Obs. in England, 2 in MPEC 2017-A72 -- 2017 AK13, 2017 AG5
Z80Northolt Branch Obs. in England, 3 in MPEC 2017-A72 -- 2017 AK13, 2017 AG5, 452389
Z48Northolt Branch Obs. 2 Shepherd's Bush in England, 3 in MPEC 2017-A72 -- 2017 AG5, 2006 UM, 2005 TF
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2017-A72 -- 2013 BK18
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2017-A72 & 2017-A73 -- 2013 GL8, 2011 BH10, 2010 NT1, 96590
W34Squirrel Valley Obs., 2 in MPEC 2017-A72 -- 2008 UL90, 1627
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPEC 2017-A72 -- 2017 AR4, 2017 AO4
926Tenagra II Obs. in Arizona, 6 in MPEC 2017-A72 -- 2017 AP13, 2017 AL13, 2017 AK13, 2017 AJ13, 2017 AG5, 2017 AF13
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 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 TB57NEODyS17212088-2116101.99e-06-6.72-7.270NEODyS: "Based on 118 optical observations (of which 2 are rejected as outliers) from 2016-09-12.527 to 2016-12-24.652."

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 '17

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

1955Generated Traffic Report
1721Noted that NEODyS has updated its 2016 TB57 risk assessment - see above
Grabbed MPEC 2017-A72 - Daily Orbit Update - see above
Grabbed MPEC 2017-A73 - 2013 GL8 - see above