Contents  on 11 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 11 January '17

Five objects reported inside ten LD

Five asteroids are reported to be less than ten lunar distances (LD) from our planet today. Nearest are NHATS target 2017 AZ3, headed out from 5.16 to 6.41 LD, and intruder 2017 AG13, outbound from 5.17 to 8.67 LD. Much more distant, 2017 AJ13 enters our ten-LD reporting "bubble," sliding in from 10.67 to 8.93 LD, while risk-listed 2017 AS4 exits the bubble, flying off from 9.60 to 13.71 LD.

Earth passage I D ~Size Distance Today  Notes
0.54 LD Jan. 92017 AG13 21 m  5.17 to 8.67 LD intruder - DOU
1.29 LD Jan. 72017 AZ3 3 m  5.16 to 6.41 LD NHATS target
1.46 LD Jan. 82017 AS4 16 m  9.60 to 13.71 LD exits ten LD, risk - DOU
2.81 LD Jan. 62017 AF13 17 m  8.41 to 9.92 LD NHATS target
6.71 LD Jan. 142017 AJ13 50 m  8.93 from 10.67 LD enters ten LD
Approaching
7.10 LD Feb. 52013 FK 74 m  < 10 LD Feb. 2 - DOU
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 - DOU

This report was generated at 2214 UTC with follow-up in today's DOU MPEC for 2017 AG13, 2017 AS4, 2016 YC8, departed 2017 AO4, and distant 2007 XH16, plus astrometry from December for approaching 2013 FK and departed objects 2016 YS, 2016 YF, and 2016 XK18.



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. "Distant" is used here to describe an object that has come within ten LD since A/CC began these traffic reports (2007) but is not presently so close. 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 11 January '17

Radar observation of one object

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


Data update noted at 2358 UTC when the database was dated 11 Jan.

NEOCP Activity  on 11 January '17

The MPC's NEO Confirmation Page has 48 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 48 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 68 listings on the NEOCP today.

New MPECs  on 11 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 11 Jan. '17 >>  MPEC 2017-A76 - "13:06 UT" - Daily Orbit Update


MPEC 2017-A75 - "04:32 UT" - Comet C/2017 A3 (Elenin)


MPEC 2017-A74 - "04:08 UT" - 2017 AB17

Observers  on 11 January '17

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-A75 -- C/2017 A3
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPEC 2017-A76 -- 2017 AG13, 2016 YZ10, 2016 YV8, 2016 YT8
T05ATLAS Haleakala in Hawaii, 4 in MPEC 2017-A76 -- 54789, 21088, 1036, 887
I47Auger Obs. in Argentina, 1 in MPEC 2017-A75 -- C/2017 A3
W96Campo Catino Austral Obs. in Chile, 1 in MPEC 2017-A75 -- C/2017 A3
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-A75 -- C/2017 A3
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 85990
J95Great Shefford Obs. in England, 1 in MPEC 2017-A74 -- 2017 AB17
K78Iota Scorpii Obs., 1 in MPEC 2017-A76 -- 2016 PZ66
Q60ISON Siding Spring Obs. in New South Wales, 1 in MPEC 2017-A75 -- C/2017 A3
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A75 -- C/2017 A3
Q620Ernesto Guido in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A75 -- C/2017 A3
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A75 -- C/2017 A3
Q622Marian Urbanik in Slovakia via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A75 -- C/2017 A3
Q623Rolando Ligustri in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A75 -- C/2017 A3
Q626Erik Bryssinck in Belgium via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A75 -- C/2017 A3
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A75 -- C/2017 A3
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A75 -- C/2017 A3
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2017-A76 -- 192559
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2017-A76 -- 192559
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-A74 -- 2017 AB17
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPEC 2017-A76 -- 2016 YN, 477762, 285944, 229007, 163249
W98Polonia Obs. in Chile, 1 in MPEC 2017-A75 -- C/2017 A3
W25RMS Obs., 3 in MPEC 2017-A76 -- 85990, 275611, 138859
204Schiaparelli Obs. in Italy, 36 in MPEC 2017-A76 -- 2017 AS4, 2017 AR4, 2017 AQ4, 2017 AO4, 2017 AJ3, 2017 AF3, 2016 YZ10, 2016 YU8, 2016 YS8, 2016 YS, 2016 YQ, 2016 YO3, 2016 YO, 2016 YN, 2016 YM, 2016 YK, 2016 YF11, 2016 YF, 2016 YE11, 2016 YC8, 2016 XQ23, 2016 XK18, 2016 XH1, 2016 XD1, 2016 VH3, 2016 OK1, 2014 ME19, 2014 AD17, 2013 FK, 2012 YN1, 2012 SA22, 2012 LK9, 2007 XH16, 2003 YR70, 2001 AO2, 474549
W883B. Lutkenhoner in Germany via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-A75 -- C/2017 A3
W889program code 9 via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-A75 -- C/2017 A3
Y00SONEAR in Brazil, 1 in MPEC 2017-A75 -- C/2017 A3
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-A74 -- 2017 AB17
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-A74 -- 2017 AB17
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-A74 -- 2017 AB17
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-A76 -- 2016 XM23, 2016 TR54
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 NL56JPL Sentry04562019-21162251.3e-06-3.04-3.370JPL: "Analysis based on 6 observations spanning 2.7808 days (2016-Jul-12.44383 to 2016-Jul-15.2246)." Diameter approximately 0.188 km. from mean, weighted H=21.4.

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 11 January '17

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

2358Noted Radar Astrometry database update - see above
2214Generated Traffic Report
1542Grabbed MPEC 2017-A76 - Daily Orbit Update - see above
0456Noted that JPL Sentry has updated its 2016 NL56 risk assessment - see above
Grabbed MPEC 2017-A74 - 2017 AB17 - see above
Grabbed MPEC 2017-A75 - Comet C/2017 A3 (Elenin) - see above