Contents  on 31 December '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 31 December '17

Ten objects reported inside ten LD

There are ten transient natural objects known to be less than ten lunar distances (LD) from our planet today. Nearest is risk-listed intruder 2017 YE7, which exits Earth's SOI (sphere of gravitational influence), moving away from 1.42 to 5.76 LD.

Earth passage I D ~Size Distance today  Inside ten LD Notes
0.58 LD Dec. 28 2017 YZ4 8 m  5.00 to 7.10 LD Dec. 23 - Jan. 2 intruder, NHATS target
0.80 LD yesterday 2017 YE7 7 m  1.42 to 5.76 LD Dec. 28 - Jan. 1 intruder, exits Earth SOI, risk
1.77 LD Dec. 15 2017 YD1 3 m  9.99 to 10.64 LD Nov. 30 - today NHATS target, exits ten LD, risk
1.93 LD Dec. 24 2017 YS1 6 m  5.01 to 5.69 LD Dec. 11 - Jan. 7 NHATS target
2.24 LD Dec. 27 2017 YD2 6 m  7.59 to 9.39 LD Dec. 21 - Jan. 1 NHATS target, risk
2.88 LD Dec. 22 2017 YE 7 m  9.45 to 10.44 LD Dec. 13 - 31 NHATS target, exits ten LD
4.73 LD Jan. 3 2017 YD7 12 m  6.73 from 8.58 LD yesterday - Jan. 6
4.84 LD Dec. 19 2017 YW3 17 m  8.85 to 9.43 LD Dec. 5 - Jan. 1 NHATS target
6.03 LD Dec. 29 2017 YB6 10 m  8.12 to 10.18 LD Dec. 26 - 31 exits ten LD
7.74 LD yesterday 2017 YU1 20 m  7.83 to 8.26 LD Dec. 26 - Jan. 3 NHATS target
Approaching (sorted by 10-LD bubble entry date)
3.7   LD Feb. 24* 2017 DR109 10 m  112.9 from 115.7 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 272 m  88.68 from 90.18 LD Feb. 28 - March 13 radar/NHATS target
* EPU = Earth passage uncertainty

This report was generated at 1840 UTC with the recovery of distant 2007 WM3 (MPEC), last reported observed ten years ago to the month. Today's DOU MPEC has first follow-up for departed 2017 YR3 and continuing follow-up for departed 2017 YH1 and distant 208023 1999 AQ10, plus astrometry from March for 2017 FM2.



Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's 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 objects that have approached Earth within ten LD since A/CC began these traffic reports eleven years ago but are not presently coming so close. Object temporal 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 31 December '17

The MPC's NEO Confirmation Page has 72 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 72 objects listed. Of these, 27 were "one nighters." So far The Tracking News has counted a total of 78 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 31 December '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-Y165 - "23:53 UT" - Comet C/2017 T1 (Heinze)


MPEC 2017-Y164 - "23:09 UT" - 2012 QQ10


<< DOU on 31 Dec. '17 >>  MPEC 2017-Y163 - "13:04 UT" - Daily Orbit Update


MPEC 2017-Y162 - "04:14 UT" - 2016 AC65


MPEC 2017-Y161 - "04:12 UT" - 2007 WM3

Observers  on 31 December '17

A total of 56 observers appear in today's MPECs.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2017-Y163 -- 1036
349Ageo Obs. in Japan, 1 in MPEC 2017-Y165 -- C/2017 T1
T05ATLAS Haleakala in Hawaii, 4 in MPEC 2017-Y163 -- 435302, 385580, 294739, 1036
T08ATLAS Mauna Loa in Hawaii, 13 in MPECs 2017-Y163 & 2017-Y165 -- C/2017 T1, 2014 QW296, 507366, 504928, 439908, 262623, 190208, 172034, 162011, 153349, 143992, 8037, 1866
I47Auger Obs. in Argentina, 1 in MPEC 2017-Y165 -- C/2017 T1
B75Betelgeuse Station in Italy, 1 in MPEC 2017-Y165 -- C/2017 T1
C86Blanes Obs. in Spain, 1 in MPEC 2017-Y165 -- C/2017 T1
B96Brixiis Obs. in Belgium, 1 in MPEC 2017-Y165 -- C/2017 T1
215Buchloe Obs. in Germany, 1 in MPEC 2017-Y165 -- C/2017 T1
160Castelmartini Obs. in Italy, 7 in MPECs 2017-Y163 & 2017-Y165 -- C/2017 T1, 504887, 438430, 189173, 154988, 136849, 2368
703Catalina Sky Survey (CSS) in Arizona, 11 in MPEC 2017-Y163 -- 2017 YH1, 475967, 439908, 36284, 337228, 208023, 177255, 17182, 153349, 137052, 1864
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPEC 2017-Y163 -- 2017 YZ1, 2017 YX5, 2017 YW5, 2017 YV5, 2017 YT5, 2017 YT3, 2017 YP3, 2017 YB7
A77Chante-Perdrix Obs. in France, 1 in MPEC 2017-Y165 -- C/2017 T1
J01Cielo Profundo Obs. in Spain, 1 in MPEC 2017-Y165 -- C/2017 T1
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-Y165 -- C/2017 T1
0953S. Nazarov via Crimean Astrophysical Obs. in Ukraine, 1 in MPEC 2017-Y165 -- C/2017 T1
K97Freconrupt Obs., 1 in MPEC 2017-Y165 -- C/2017 T1
372Geisei Obs. in Japan, 1 in MPEC 2017-Y165 -- C/2017 T1
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2017-Y163 -- 2017 YR1
D88Hiratsuka Obs. in Japan, 1 in MPEC 2017-Y165 -- C/2017 T1
987Isle of Man Obs. on the Isle of Man, 1 in MPEC 2017-Y165 -- C/2017 T1
U695Hidetaka Sato in Japan via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-Y165 -- C/2017 T1
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-Y165 -- C/2017 T1
H06#M. Suzuki in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-Y165 -- C/2017 T1
585Kiev Comet Station in Ukraine, 1 in MPEC 2017-Y165 -- C/2017 T1
695@program code "@" (41) via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2017-Y165 -- C/2017 T1
D95Kurihara Obs. in Japan, 1 in MPEC 2017-Y165 -- C/2017 T1
130Lumezzane Obs. in Italy, 1 in MPEC 2017-Y165 -- C/2017 T1
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2017-Y163 -- 415029
A06Mataro Obs. in Spain, 1 in MPEC 2017-Y165 -- C/2017 T1
213Montcabre Obs. in Spain, 1 in MPEC 2017-Y165 -- C/2017 T1
G96Mt. Lemmon Survey (MLS) in Arizona, 26 in MPEC 2017-Y163 -- 2017 YP5, 2017 YG1, 2017 XO60, 2017 WX12, 2017 UW4, 2017 TO4, 2015 VO66, 2011 BM24, 2000 BL19, 459386, 455432, 417217, 36284, 307493, 267337, 238063, 225586, 208023, 203015, 194126, 177255, 152931, 138175, 137078, 6053, 1864
D81Nagano Obs. in Japan, 1 in MPEC 2017-Y165 -- C/2017 T1
C47Nonndorf Obs. in Austria, 1 in MPEC 2017-Y165 -- C/2017 T1
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-Y165 -- C/2017 T1
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2017-Y165 -- C/2017 T1
F51Pan-STARRS 1 (PS1) in Hawaii, 17 in MPEC 2017-Y163 -- 2017 YZ1, 2017 XD, 2017 OP19, 2015 AZ245, 85709, 55532, 348595, 345853, 338176, 241370, 232368, 17181, 163691, 155110, 142464, 141874, 4487
B49Paus Obs. in Spain, 1 in MPEC 2017-Y165 -- C/2017 T1
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2017-Y165 -- C/2017 T1
B70Sant Celoni Obs. in Spain, 1 in MPEC 2017-Y165 -- C/2017 T1
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2017-Y165 -- C/2017 T1
Q11Shinshiro Obs., 1 in MPEC 2017-Y165 -- C/2017 T1
G40(program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-Y165 -- C/2017 T1
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-Y165 -- C/2017 T1
W883B. Lutkenhoner in Germany via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-Y165 -- C/2017 T1
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-Y163 -- 2017 XD
L06Sormano2 Obs. in Italy, 1 in MPEC 2017-Y165 -- C/2017 T1
Q21Southern Utsunomiya in Japan, 1 in MPEC 2017-Y165 -- C/2017 T1
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2017-Y163 & 2017-Y165 -- 2017 YU3, 2017 XV2, C/2017 T1, 2016 CL32, 137199
A71Stixendorf Obs. in Austria, 1 in MPEC 2017-Y165 -- C/2017 T1
Q38Swan Hill Obs., 1 in MPEC 2017-Y165 -- C/2017 T1
461SZTE Asteroid Program in Hungary, 1 in MPEC 2017-Y165 -- C/2017 T1
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-Y165 -- C/2017 T1
I81Tarbatness Obs. in Scotland, 1 in MPEC 2017-Y165 -- C/2017 T1
926Tenagra II Obs. in Arizona, 4 in MPECs 2017-Y161, 2017-Y162 & 2017-Y163 -- 2017 YY5, 2017 YR3, 2016 AC65, 2007 WM3
C35Terrassa Obs. in Spain, 1 in MPEC 2017-Y165 -- C/2017 T1
W33Transit Dreams Obs., 1 in MPEC 2017-Y165 -- C/2017 T1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2017-Y163 & 2017-Y164 -- 2017 FM2, 2012 QQ10
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2017-Y165 -- C/2017 T1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 December '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS 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 NASA/JPL 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 YT5JPL Sentry16452021-202119.720e-10-4.46-4.460JPL: Computed at 07:51 today Pacific time based on 16 observations spanning 4.9479 days (2017-Dec-23.48994 to 2017-Dec-28.43782). Diameter approximately 0.610 km. from weighted mean H=18.72.
2017 YP5JPL Sentry1645R E M O V E DJPL: Risk listing removed at 1549 UTC today
2017 YZ1JPL Sentry16452047-2117251.84935333e-05-2.39-2.410JPL: Computed at 07:59 today Pacific time based on 37 observations spanning 10.808 days (2017-Dec-20.42481 to 2017-Dec-31.23287). Diameter approximately 0.250 km. from weighted mean H=20.69.

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 31 December '17

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

2358Grabbed MPEC 2017-Y165 - Comet C/2017 T1 (Heinze) - see above
2325Grabbed MPEC 2017-Y164 - 2012 QQ10 - see above
1856Generated Traffic Report
1645Noted that JPL Sentry has removed 2017 YP5 as an impact risk - see above
Noted that JPL Sentry has posted 2017 YT5 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 YZ1 risk assessment - see above
Grabbed MPEC 2017-Y163 - Daily Orbit Update - see above
0446Grabbed MPEC 2017-Y161 - 2007 WM3 - see above
Grabbed MPEC 2017-Y162 - 2016 AC65 - see above