Contents  on 2 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 2 November '17

Eight objects reported inside ten LD

There are eight Solar-System small bodies reported moving within ten lunar distances (LD) of our planet today. Nearest is 2017 UD43, which heads away from 4.70 to 5.23 LD.

Earth passage I D ~Size Distance Today  Notes
0.15 LD Oct. 282017 UL6 1 m  7.35 to 8.98 LD intruder, risk
0.59 LD Oct. 302017 UK8 8 m  8.75 to 11.89 LD intruder, exits ten LD
1.16 LD Oct. 302017 UL8 8 m  6.80 to 9.12 LD
4.54 LD Nov. 52017 UJ43 9 m  6.07 from 7.26 LD risk
4.68 LD yesterday2017 UD43 7 m  4.70 to 5.23 LD
5.49 LD Oct. 302017 UJ6 17 m  7.75 to 9.71 LD
6.58 LD Oct. 312017 UO43 9 m  7.04 to 7.59 LD
7.05 LD Nov. 52017 US7 13 m  8.34 from 9.54 LD
8.66 LD Nov. 17444584 2006 UK 309 m  < 10 LD Nov. 16

This report was generated at 1840 UTC with follow-up in today's DOU MPEC for departed objects 171576 1999 VP11 and risk-listed 2017 UP43 and 2017 UO7 (first follow-up), as well as for distant 2003 UV11 .

Reading:  The NASA/JPL Solar System Dynamics group has advised on the Horizons news page, for those trying to calculate the path of interstellar small body A/2017 U1 while outside the Kuiper Belt, that the parameter used by Horizons for the center of mass (the barycenter) of the Solar System does not include the Kuiper Belt, which is uncertain but "estimated to be 20-200 times greater than the mass of the main-belt."

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 an object that has come within ten LD since A/CC began these traffic reports (2007) but is not now 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 2 November '17

The MPC's NEO Confirmation Page has 81 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 81 objects listed. Of these, 33 were "one nighters."

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 2 November '17

Minor Planet Electronic Circulars

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

<< DOU on 2 Nov. '17 >>  MPEC 2017-V05 - "12:07 UT" - Daily Orbit Update

Observers  on 2 November '17

Nineteen observers appear in today's MPEC.

CodeObserver / observatory
C97Al-Fulaij Obs., 4 in MPEC 2017-V05 -- 2003 UV11, 500749, 8037, 3361
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2017-V05 -- 2017 UT2, 2017 UT, 2017 UO7, 2017 UO, 2017 UJ5, 2017 UG6, 2017 TR1, 2017 TC4, 2017 SS19, 2017 SL2, 2017 RR15
T05ATLAS Haleakala in Hawaii, 6 in MPEC 2017-V05 -- 2017 SO17, 87311, 53319, 21374, 141670, 7977
T08ATLAS Mauna Loa in Hawaii, 8 in MPEC 2017-V05 -- 2014 YC15, 1998 WP7, 496005, 190208, 17511, 138205, 3200, 1580
160Castelmartini Obs. in Italy, 7 in MPEC 2017-V05 -- 2017 UL44, 2017 SL2, 2014 UR116, 497176, 457768, 333908, 11500
K51Celado Obs. in Italy, 4 in MPEC 2017-V05 -- 2017 UP43, 2017 UF43, 250458, 154589
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2017-V05 -- 2017 UQ4, 2017 TS3
006Fabra Obs. in Spain, 4 in MPEC 2017-V05 -- 190208, 171576, 3361, 1865
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-V05 -- 2017 UL44
J95Great Shefford Obs. in England, 2 in MPEC 2017-V05 -- 2017 UP43, 2017 UL44
Z43Landehen Obs., 1 in MPEC 2017-V05 -- 3122
130Lumezzane Obs. in Italy, 4 in MPEC 2017-V05 -- 2017 SQ11, 2015 BF4, 2014 UR116, 1999 AF4
J69North Obs. in England, 3 in MPEC 2017-V05 -- 2014 YC15, 500749, 496816
557Ondrejov Obs. in the Czech Republic, 2 in MPEC 2017-V05 -- 65679, 3361
D29Purple Mtn. Obs. Xuyi Station in China, 5 in MPEC 2017-V05 -- 2017 TK1, 2009 SP171, 2009 EO2, 85839, 2212
L04ROASTERR-1 in Romania, 1 in MPEC 2017-V05 -- 2017 OQ68
G40!M. Kumrucu-Lohmiller in Massachusetts via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-V05 -- 496817
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-V05 -- 2015 XR128
C51WISE in Earth polar orbit, 1 in MPEC 2017-V05 -- 87684
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 November '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.





Notes for Today's Latest Risk Assessments
2017 UP43JPL Sentry16422110-211666.71047e-06-6.25-6.560JPL: Computed at 08:05 today Pacific time based on 34 observations spanning 3.5248 days (2017-Oct-29.48637 to 2017-Nov-02.01118). Diameter approximately 0.018 km. from weighted mean H=26.42.
NEODyS16422110-211661.94e-05-5.78-6.10NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2017-10-29.487 to 2017-11-02.012."
2017 UQ7NEODyS1642R 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 2 November '17

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

1840Generated Traffic Report
1642Noted that JPL Sentry has updated its 2017 UP43 risk assessment - see above
Noted that NEODyS has updated its 2017 UP43 risk assessment - see above
Noted that NEODyS has removed 2017 UQ7 as an impact risk - see above
Grabbed MPEC 2017-V05 - Daily Orbit Update - see above