Contents  on 8 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 8 January '17

Five objects reported inside ten LD

Five asteroidal objects are known to be traveling within ten lunar distances (LD) of our home world today. The nearest is within Earth's SOI (sphere of gravitational influence): risk-listed 2017 AS4 comes its closest to Earth this time around, reaching 1.46 LD at 1704 UTC, and its closest to the Moon -- 2.14 LD at 1345 UTC. NHATS target 2017 AZ3 exits the SOI, passing from 1.72 to 2.75 LD, and a new discovery, intruder 2017 AG13, enters Earth's SOI, coming in from 5.41 to 1.95 LD on its way to zooming safely through the Earth-Moon system tomorrow.

The other two objects are further out and moving away: newly announced 2017 AF13 is outbound from 4.23 to 5.52 LD and NHATS target 2016 YR from 9.27 to 9.58 LD.

Coming towards us next, latest discovery 2017 AJ13 enters ten LD on January 11th.

Earth passage I D ~Size Distance Today  Notes
0.54 LD tomorrow2017 AG13 20 m  1.95 from 5.41 LD NEW, enters Earth SOI, intruder tomorrow - MPEC
1.29 LD yesterday2017 AZ3 3 m  1.72 to 2.75 LD NHATS target, exits Earth SOI
1.46 LD today2017 AS4 16 m  1.46 LD enters Earth SOI, Earth closest at 1704 UTC, Moon closest 2.14 LD at 1345 UTC
2.81 LD Jan. 62017 AF13 17 m  4.23 to 5.52 LD NEW - MPEC
7.16 LD Dec. 272016 YR 12 m  9.27 to 9.58 LD NHATS target
Approaching
6.71 LD Jan. 142017 AJ13 50 m  < 10 LD Jan. 11, NEW - MPEC
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
9.46 LD Jan. 182016 YC8 41 m  < 10 LD Jan. 16, NHATS target - DOU

This report was updated at 2348 UTC with the discoveries of approaching 2017 AJ13 (MPEC) and departed 2017 AK13 (MPEC), which passed Earth at 8.76 LD on January 3rd. Today's first traffic report was generated at 2030 UTC with new discoveries 2017 AG13 (MPEC) and 2017 AF13 (MPEC), and with follow-up in today's DOU MPEC for approaching objects 2013 FK and risk-listed NHATS target 2016 YC8, and for departed objects 2017 AG5 and 2017 AE3.



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 8 January '17

The MPC's NEO Confirmation Page has 78 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 78 objects listed. Of these, 34 were "one nighters." So far The Tracking News has counted a total of 93 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 8 January '17

Minor Planet Electronic Circulars

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


MPEC 2017-A63 - "21:49 UT" - 2017 AM13


MPEC 2017-A62 - "21:46 UT" - 2017 AL13


MPEC 2017-A61 - "21:42 UT" - 2017 AK13


MPEC 2017-A60 - "21:34 UT" - 2017 AJ13


MPEC 2017-A59 - "21:31 UT" - 2017 AH13


MPEC 2017-A58 - "15:14 UT" - 2017 AG13


MPEC 2017-A57 - "15:11 UT" - 2017 AF13


MPEC 2017-A56 - "15:08 UT" - 2017 AE13


MPEC 2017-A55 - "14:54 UT" - 1994 BB


<< DOU on 8 Jan. '17 >>  MPEC 2017-A54 - "13:05 UT" - Daily Orbit Update

Observers  on 8 January '17

A total of 36 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-A60 -- 2017 AJ13
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2017-A54, 2017-A59, 2017-A60, 2017-A61 & 2017-A62 -- 2017 AL13, 2017 AK13, 2017 AJ13, 2017 AH13, 2016 WV
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-A61 -- 2017 AK13
B96Brixiis Obs. in Belgium, 1 in MPEC 2017-A54 -- 326683
Z84Calar Alto Schmidt in Spain, 2 in MPECs 2017-A57 & 2017-A61 -- 2017 AK13, 2017 AF13
G36CASADO in Spain, 5 in MPEC 2017-A54 -- 2016 NQ32, 42286, 140928, 3691, 1862
160Castelmartini Obs. in Italy, 3 in MPECs 2017-A57, 2017-A60 & 2017-A61 -- 2017 AK13, 2017 AJ13, 2017 AF13
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2017-A54 & 2017-A58 -- 2017 AG13, 2017 AF5, 2016 YU10, 2016 YN4, 2016 UE101, 2016 PR8, 2016 LM8, 349507, 347813, 262623, 203471, 138925
K51Celado Obs. in Italy, 3 in MPECs 2017-A60, 2017-A61 & 2017-A62 -- 2017 AL13, 2017 AK13, 2017 AJ13
K65Cesena Obs. in Italy, 3 in MPECs 2017-A54 & 2017-A58 -- 2017 AG13, 2016 VY5, 2016 UE101
958Dax Obs. in France, 4 in MPECs 2017-A57, 2017-A58, 2017-A60 & 2017-A61 -- 2017 AK13, 2017 AJ13, 2017 AG13, 2017 AF13
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2017-A54, 2017-A60 & 2017-A61 -- 2017 AK13, 2017 AJ13, 2016 YC8
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-A54 -- 2016 UE101
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A57 -- 2017 AF13
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 13 in MPEC 2017-A54 -- 2017 AV3, 2016 YC8, 2016 WJ8, 2016 UU4, 2016 UN5, 2016 UB42, 2016 TJ18, 2016 SG45, 2016 HV3, 2015 VO66, 2015 VL142, 2003 QH5, 2001 PT9
K38M57 Obs. in Italy, 1 in MPEC 2017-A54 -- 2017 AR4
G96Mt. Lemmon Survey (MLS) in Arizona, 44 in MPECs 2017-A54, 2017-A55, 2017-A57, 2017-A58, 2017-A60, 2017-A61, 2017-A62 & 2017-A63 -- 2017 AM13, 2017 AL13, 2017 AK13, 2017 AJ13, 2017 AG13, 2017 AF3, 2017 AF13, 2017 AE3, 2016 YQ8, 2016 XT1, 2016 WL8, 2016 UN36, 2016 TD18, 2016 RO1, 2015 VL142, 2014 KZ45, 2014 AD17, 2013 FK, 2011 QP96, 2010 NT1, 2006 OS5, 2006 OH15, 2001 AO2, 1998 YM4, 1994 BB, 99935, 474554, 404108, 388838, 38091, 275611, 202683, 18109, 168378, 162882, 154007, 152667, 13651, 9172, 5828, 5626, 4503, 4183, 3271
C23Olmen Obs. in Belgium, 1 in MPEC 2017-A54 -- 2102
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2017-A54, 2017-A56, 2017-A59 & 2017-A63 -- 2017 AM13, 2017 AH13, 2017 AE13, 248083
B49Paus Obs. in Spain, 1 in MPEC 2017-A58 -- 2017 AG13
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 12 in MPEC 2017-A54 -- 2017 AG5, 2017 AE3, 2016 NL15, 2008 UL90, 2006 UM, 96590, 85804, 378610, 4179, 3352, 2102, 433
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2017-A55 -- 1994 BB
W25RMS Obs., 1 in MPEC 2017-A58 -- 2017 AG13
619Sabadell Obs. in Spain, 1 in MPEC 2017-A54 -- 2102
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2017-A61 -- 2017 AK13
204Schiaparelli Obs. in Italy, 5 in MPECs 2017-A57, 2017-A58, 2017-A60, 2017-A61 & 2017-A62 -- 2017 AL13, 2017 AK13, 2017 AJ13, 2017 AG13, 2017 AF13
Y00SONEAR in Brazil, 1 in MPEC 2017-A57 -- 2017 AF13
587Sormano Obs. in Italy, 1 in MPEC 2017-A61 -- 2017 AK13
691Spacewatch 0.9m telescope in Arizona, 10 in MPECs 2017-A54, 2017-A57, 2017-A59, 2017-A60, 2017-A61 & 2017-A62 -- 2017 AL13, 2017 AK13, 2017 AJ13, 2017 AH13, 2017 AF3, 2017 AF13, 2016 YW7, 2016 YH8, 2015 BN509, 477491
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2017-A54, 2017-A56 & 2017-A59 -- 2017 AH13, 2017 AE13, 2016 VV3, 2015 XY378, 2012 RG3, 2007 CA19, 2006 QT89
I93St. Pardon de Conques Obs. in France, 6 in MPECs 2017-A57, 2017-A58, 2017-A60, 2017-A61, 2017-A62 & 2017-A63 -- 2017 AM13, 2017 AL13, 2017 AK13, 2017 AJ13, 2017 AG13, 2017 AF13
I52Steward Obs. Mt. Lemmon Station in Arizona, 10 in MPECs 2017-A54, 2017-A55, 2017-A57, 2017-A58, 2017-A60, 2017-A61, 2017-A62 & 2017-A63 -- 2017 AT4, 2017 AR4, 2017 AM13, 2017 AL13, 2017 AK13, 2017 AJ13, 2017 AG13, 2017 AF13, 2016 YU10, 1994 BB
926Tenagra II Obs. in Arizona, 3 in MPECs 2017-A55, 2017-A56 & 2017-A59 -- 2017 AH13, 2017 AE13, 1994 BB
Z52The Studios Obs., 6 in MPEC 2017-A54 -- 96590, 85804, 5836, 5653, 4179, 2102
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-A54 -- 2016 YJ4
C44Volta Obs. in Italy, 2 in MPECs 2017-A58 & 2017-A61 -- 2017 AK13, 2017 AG13
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 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
2017 AS4NEODyS1644207119.34e-09-8.62-8.620NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2017-01-05.235 to 2017-01-07.410."
2016 YC8NEODyS2028R E M O V E D-

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 8 January '17

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

2348Updated Traffic Report
2159Grabbed MPEC 2017-A60 - 2017 AJ13 - see above
Grabbed MPEC 2017-A61 - 2017 AK13 - see above
Grabbed MPEC 2017-A62 - 2017 AL13 - see above
Grabbed MPEC 2017-A63 - 2017 AM13 - see above
2136Grabbed MPEC 2017-A59 - 2017 AH13 - see above
2028Noted that NEODyS has removed 2016 YC8 as an impact risk - see above
1644Noted that NEODyS has posted 2017 AS4 as an impact risk - see above
Grabbed MPEC 2017-A54 - Daily Orbit Update - see above
Grabbed MPEC 2017-A55 - 1994 BB - see above
Grabbed MPEC 2017-A56 - 2017 AE13 - see above
Grabbed MPEC 2017-A57 - 2017 AF13 - see above
Grabbed MPEC 2017-A58 - 2017 AG13 - see above