Contents  on 8 January '18

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 '18

No objects reported inside ten LD

There are no confirmed minor objects traveling inside ten lunar distances (LD) of our planet today. Three are known to be arriving in the near future

Approaching (sorted by 10-LD bubble entry date)
Earth passage I D ~Size Distance today  Inside ten LD Notes
4.6   LD Jan. 23* 2018 AJ 39 m  20.0 from 21.3 LD Jan. 16 - 30 EPU +/- 1.90 hours*
3.7   LD Feb. 24* 2017 DR109 10 m  93.8 from 96.5 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 272 m  78.56 from 79.96 LD Feb. 28 - March 13 radar/NHATS target
* EPU = Earth passage uncertainty

This report was generated at 2048 UTC with follow-up in today's DOU MPEC for departed 2017 XS plus astrometry from early December for 2006 XY and 496817 1989 VB, and from March for 2017 FD3.

Reading:  A science paper today presents results from McDonald Observatory imaging and spectroscopy of comet C/2016 R2 (Panstarrs), which has been a recent object of discussion on the Comets Mailing List. Another paper posted today reports "on the results of a systematic search for associated asteroid families for all active asteroids known to date" and comparing Main Belt comets with disrupted asteroids.



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. 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 8 January '18

The MPC's NEO Confirmation Page has 39 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 39 objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 40 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 '18

Minor Planet Electronic Circulars

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


<< DOU on 8 Jan. '18 >>  MPEC 2018-A29 - "13:03 UT" - Daily Orbit Update


MPEC 2018-A28 - "12:42 UT" - 2016 AR130


MPEC 2018-A27 - "12:40 UT" - 2012 BV26


MPEC 2018-A26 - "00:04 UT" - Comet C/2017 AB5 (Panstarrs)

Observers  on 8 January '18

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPEC 2018-A29 -- 2017 YH5, 2017 UZ51, 2016 AG165
T08ATLAS Mauna Loa in Hawaii, 13 in MPEC 2018-A29 -- 2007 AG, 88188, 53110, 504928, 439908, 348314, 17182, 16657, 153349, 136849, 8567, 8037, 6053
160Castelmartini Obs. in Italy, 28 in MPEC 2018-A29 -- 2017 WS1, 2017 WL1, 2014 YC15, 2006 XY, 96590, 505667, 505178, 504680, 496817, 495858, 438897, 438430, 415029, 349928, 333888, 21374, 190208, 16657, 162472, 162011, 154589, 143992, 142040, 140158, 136849, 8037, 1864, 1627
703Catalina Sky Survey (CSS) in Arizona, 9 in MPEC 2018-A29 -- 497176, 338176, 333888, 189173, 142040, 100926, 6050, 2329, 2202
K88GINOP-KHK in Hungary, 1 in MPEC 2018-A26 -- C/2017 AB5
J95Great Shefford Obs. in England, 3 in MPECs 2018-A26 & 2018-A29 -- 2017 YN3, C/2017 AB5, 326354
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2018-A29 -- 2017 XQ61
474Mt. John Obs. in New Zealand, 2 in MPEC 2018-A29 -- 2017 YP3, 2015 OX78
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2018-A27 & 2018-A29 -- 2017 YC2, 2017 WE16, 2012 BV26, 96590, 505093, 459386, 438430, 348314, 267337, 17511, 137052, 6053
J43Oukaimeden Obs. in Morocco, 3 in MPEC 2018-A29 -- 85839, 153349, 143992
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPECs 2018-A26, 2018-A27, 2018-A28 & 2018-A29 -- C/2017 AB5, 2016 AR130, 2012 BV26, 2006 OD7, 2005 FL4, 1999 AF4, 455432, 228587, 225586, 189173, 177255, 138013, 1864
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-A26 -- C/2017 AB5
L11Sandvreten Obs., 3 in MPEC 2018-A29 -- 2017 VW13, 2017 VK1, 2017 VD2
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-A29 -- 2017 XD
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2018-A29 -- 2017 XS, 2017 UR7, 29075, 162273
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2018-A29 -- 2017 YT5, 2017 YO6, 2017 SV20, 2015 CV13, 216985
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2018-A29 -- 3122
I52Steward Obs. Mt. Lemmon Station in Arizona, 6 in MPECs 2018-A27, 2018-A28 & 2018-A29 -- 2017 YP5, 2017 YC2, 2017 WE16, 2016 AR130, 2012 BV26, 326354
926Tenagra II Obs. in Arizona, 3 in MPECs 2018-A26, 2018-A28 & 2018-A29 -- C/2017 AB5, 2016 AR130, 2005 GE60
Z52The Studios Obs., 2 in MPEC 2018-A29 -- 12711, 3122
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 5 in MPEC 2018-A29 -- 2017 FP2, 2017 FD3, 2017 DB109, 2017 BM31, 265482
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 January '18

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 YO6JPL Sentry18032085-209535.9253e-08-6.04-6.100JPL: Computed at 08:59 today Pacific time based on 22 observations spanning 12.786 days (2017-Dec-26.47691 to 2018-Jan-08.26315). Diameter approximately 0.120 km. from weighted mean H=22.30.
2017 YT5JPL Sentry1803R E M O V E DJPL: Risk listing removed at 1654 UTC today
2017 WE30NEODyS18032041-2103118.04e-08-10.05-10.160NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2017-11-26.266 to 2017-11-26.476."
2017 VW13JPL Sentry18032097-209715.384e-09-6.41-6.410JPL: Computed at 08:55 today Pacific time based on 253 observations spanning 53.762 days (2017-Nov-13.64011 to 2018-Jan-06.40207). Diameter approximately 0.250 km. from weighted mean H=20.64.

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 '18

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

2048Generated Traffic Report
1803Noted that JPL Sentry has updated its 2017 VW13 risk assessment - see above
Noted that NEODyS has posted 2017 WE30 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 YO6 risk assessment - see above
Noted that JPL Sentry has removed 2017 YT5 as an impact risk - see above
Grabbed MPEC 2018-A27 - 2012 BV26 - see above
Grabbed MPEC 2018-A28 - 2016 AR130 - see above
Grabbed MPEC 2018-A29 - Daily Orbit Update - see above
0026Grabbed MPEC 2018-A26 - Comet C/2017 AB5 (Panstarrs) - see above