Contents  on 4 November '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 4 November '17

Four objects reported inside ten LD

Four transient natural objects are known to be less than ten lunar distances (LD) from Earth today. Nearest is risk-listed 2017 UJ43, inbound from 5.12 to 4.60 LD.

Earth passage I D ~Size Distance Today  Notes
4.54 LD tomorrow2017 UJ43 10 m  4.60 from 5.12 LD risk - DOU
4.68 LD Nov. 12017 UD43 7 m  6.36 to 7.84 LD
6.58 LD Oct. 312017 UO43 9 m  8.30 to 9.13 LD
7.05 LD tomorrow2017 US7 13 m  7.07 from 7.47 LD
8.66 LD Nov. 17444584 2006 UK 309 m  < 10 LD Nov. 16

This report was generated at 1910 UTC with additional observation of departed 2017 VA in today's DOU MPEC along with follow-up for inbound risk-listed 2017 UJ43 and departed 171576 1999 VP11.

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 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 4 November '17

The MPC's NEO Confirmation Page has 68 listings

When last checked at 2342 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 68 objects listed. Of these, 25 were "one nighters." So far The Tracking News has counted a total of 69 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 4 November '17

Minor Planet Electronic Circulars

As of last check at 2342 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 4 Nov. '17 >>  MPEC 2017-V14 - "12:09 UT" - Daily Orbit Update

Observers  on 4 November '17

Fifteen observers appear in today's MPEC.

CodeObserver / observatory
C97Al-Fulaij Obs., 4 in MPEC 2017-V14 -- 2017 UZ42, 496005, 333888, 154589
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2017-V14 -- 2017 MG3, 2017 ME7, 2017 MB4, 2017 KT34, 498550, 222165
T05ATLAS Haleakala in Hawaii, 6 in MPEC 2017-V14 -- 2014 YC15, 496005, 457768, 190208, 17511, 3200
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-V14 -- 21374
073Bucharest Obs. in Romania, 1 in MPEC 2017-V14 -- 99907
160Castelmartini Obs. in Italy, 5 in MPEC 2017-V14 -- 2017 QQ32, 90075, 497176, 162273, 8037
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-V14 -- 17511
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-V14 -- 2017 QQ32
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPEC 2017-V14 -- 2017 SH10, 2017 RL, 90075, 242211, 6611, 3200, 1580
D29Purple Mtn. Obs. Xuyi Station in China, 5 in MPEC 2017-V14 -- 90075, 497176, 497096, 154988, 144898
V83Rolling Hills Obs. in Missouri, 1 in MPEC 2017-V14 -- 171576
619Sabadell Obs. in Spain, 1 in MPEC 2017-V14 -- 171576
926Tenagra II Obs. in Arizona, 4 in MPEC 2017-V14 -- 2017 VA, 2017 UM44, 2017 UK6, 2017 UJ43
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-V14 -- 2016 CX31, 2012 KK18
C51WISE in Earth polar orbit, 3 in MPEC 2017-V14 -- 2010 WL, 496837, 7977
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 November '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2342 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.





Notes for Today's Latest Risk Assessments
2017 UA45NEODyS17082074-21171501.55e-04-4.76-5.030NEODyS: "Based on 13 optical observations (of which 1 are rejected as outliers) from 2017-10-27.475 to 2017-11-01.242."
2017 UJ43JPL Sentry17082050-2109294.9134735e-05-5.81-6.150JPL: Computed at 08:06 today Pacific time based on 21 observations spanning 5.8073 days (2017-Oct-28.50805 to 2017-Nov-03.31535). Diameter approximately 0.010 km. from weighted mean H=27.75.
NEODyS17082052-2110401.62e-05-6.36-6.420NEODyS: "Based on 21 optical observations (of which 3 are rejected as outliers) from 2017-10-28.509 to 2017-11-03.316."

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 4 November '17

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

1910Generated Traffic Report
1708Noted that NEODyS has posted 2017 UA45 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 UJ43 risk assessment - see above
Noted that NEODyS has updated its 2017 UJ43 risk assessment - see above
Grabbed MPEC 2017-V14 - Daily Orbit Update - see above