Contents  on 3 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 3 January '17

One object reported inside ten LD

Today just one small Solar-System body is known to be within ten lunar distances (LD) of Earth -- NHATS target 2016 YR, outbound from 7.96 to 8.18 LD. Meanwhile, risk-listed NHATS target 2016 YC8 is on its way to slip inside ten LD on January 15th.

This report was generated at 1954 UTC with first follow-up for departed risk-listed 2016 YD8 (5.50 days added to 1.56-day discovery arc) and distant 1995 CR (recovery arc extended from seven minutes to 4.13 days) in today's DOU MPEC along with follow-up for 2016 YC8 and departed NHATS target 2016 XR23.

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.

NEOCP Activity  on 3 January '17

The MPC's NEO Confirmation Page has 62 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 62 objects listed. Of these, 43 were "one nighters." So far The Tracking News has counted a total of 70 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 3 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 3 Jan. '17 >>  MPEC 2017-A11 - "13:06 UT" - Daily Orbit Update

MPEC 2017-A10 - "03:38 UT" - 2016 YF11

MPEC 2017-A09 - "03:35 UT" - 2012 VN6

Observers  on 3 January '17

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2017-A11 -- 2016 XS1, 2016 XR23, 2016 WO1, 2016 VY5, 2016 TY92, 2016 OK1, 2016 NV, 2016 NL15, 2006 UM, 433
T05ATLAS Haleakala in Hawaii, 11 in MPECs 2017-A10 & 2017-A11 -- 2016 YM, 2016 YF11, 2016 XW17, 87684, 54789, 434677, 385343, 248083, 186822, 1036, 887
300Bisei Spaceguard Center in Japan, 2 in MPECs 2017-A10 & 2017-A11 -- 2016 YF11, 2016 PZ66
160Castelmartini Obs. in Italy, 28 in MPEC 2017-A11 -- 2016 PR8, 2014 AD17, 2013 EW27, 96590, 90075, 475665, 468583, 414960, 413002, 357024, 35396, 262623, 203471, 159608, 152563, 138846, 13651, 12538, 11398, 5836, 5693, 5626, 5131, 3352, 3199, 3103, 2102, 1627
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPEC 2017-A11 -- 2016 WF9, 2016 UM41, 2016 TV17, 2016 NO16
J95Great Shefford Obs. in England, 4 in MPECs 2017-A10 & 2017-A11 -- 2016 YF11, 2016 YD8, 2016 YB8, 2016 YB11
Q622Marian Urbanik in Slovakia via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A11 -- 106589
130Lumezzane Obs. in Italy, 9 in MPEC 2017-A11 -- 2016 XD1, 2016 UE101, 2016 NV, 2014 ME19, 2005 TF, 468583, 378610, 357024, 345705
J69North Obs. in England, 2 in MPEC 2017-A11 -- 2016 YK, 2016 YC8
C23Olmen Obs. in Belgium, 1 in MPEC 2017-A11 -- 2102
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2017-A11 -- 34613, 153951
F51Pan-STARRS 1 (PS1) in Hawaii, 22 in MPEC 2017-A11 -- 2016 YX7, 2016 YU8, 2016 YJ3, 2016 UJ101, 2016 NQ32, 2009 BE77, 2003 LX5, 469722, 469356, 418900, 417581, 413002, 374038, 363814, 348314, 310842, 307070, 171839, 138175, 13553, 12711, 5189
D29Purple Mtn. Obs. Xuyi Station in China, 8 in MPEC 2017-A11 -- 97725, 54401, 468583, 413002, 275611, 226198, 154269, 5131
Q11Shinshiro Obs., 1 in MPEC 2017-A11 -- 96590
510Siegen Obs. in Germany, 2 in MPEC 2017-A11 -- 2102, 433
587Sormano Obs. in Italy, 1 in MPEC 2017-A11 -- 2016 YO3
G45Space Surveillance Telescope Atom Site in New Mexico, 1 in MPEC 2017-A10 -- 2016 YF11
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2017-A11 -- 2016 YD8, 2016 YC8, 1995 CR
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2017-A09 & 2017-A11 -- 2016 XG1, 2012 VN6
C51WISE in Earth polar orbit, 3 in MPEC 2017-A11 -- 2016 OK1, 2013 EW27, 2004 QD20
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 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
2016 YD8NEODyS2200R E M O V E D-
JPL Sentry1650R E M O V E DJPL: Risk listing removed at 1600 UTC.
2016 YC8NEODyS2231204513.84e-11-10.07-10.070NEODyS: "Based on 61 optical observations (of which 0 are rejected as outliers) from 2016-12-27.359 to 2017-01-03.342."

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 3 January '17

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

2231Noted that NEODyS has updated its 2016 YC8 risk assessment - see above
2200Noted that NEODyS has removed 2016 YD8 as an impact risk - see above
1954Generated Traffic Report
1650Noted that JPL Sentry has removed 2016 YD8 as an impact risk - see above
Grabbed MPEC 2017-A11 - Daily Orbit Update - see above
0451Grabbed MPEC 2017-A09 - 2012 VN6 - see above
Grabbed MPEC 2017-A10 - 2016 YF11 - see above