Contents  on 29 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 29 November '17

Eleven objects reported inside ten LD

Eleven minor planets are reported inside ten lunar distances (LD) of Earth today. Nearest of these is 2017 WF16, which comes its closest to us this time around, reaching 3.72 LD at 0346 UTC.

Earth passage I D ~Size Distance Today  Notes
1.74 LD Nov. 262017 WH13 16 m  7.29 to 9.80 LD
2.02 LD Nov. 252017 VY13 18 m  7.61 to 9.90 LD DOU
3.18 LD Nov. 242017 VZ14 32 m  9.05 to 10.83 LD exits ten LD - DOU
3.67 LD Dec. 22008 WM61 15 m  4.50 from 5.18 LD NHATS target
3.72 LD today2017 WF16 6 m  3.72 LD Earth closest at 0346 UTC
4.45 LD yesterday2017 WD28 25 m  4.46 to 5.55 LD
6.39 LD tomorrow2017 WH2 46 m  6.62 from 8.43 LD
7.30 LD Nov. 272017 WC14 25 m  8.77 to 10.37 LD exits ten LD
7.37 LD today2017 WN15 36 m  7.37 LD Earth closest at 0403 UTC
7.78 LD yesterday2017 WK1 14 m  7.95 to 8.51 LD
8.73 LD Nov. 272017 WK15 15 m  9.05 to 9.46 LD DOU

This report was generated at 1742 UTC with follow-up in today's DOU MPEC for four objects in the active traffic tables above and below, and for departed 2017 VA15, 2017 VG1, and risk-listed 2017 WJ13.

Approaching (sorted by 10-LD bubble entry date)
9.45 LD Dec. 52017 WS13 40 m  < 10 LD Dec. 4 - DOU
3.35 LD Dec. 142006 XY 54 m  < 10 LD Dec. 5, NHATS target
3.44 LD Dec. 92017 WV12 24 m  < 10 LD Dec. 5
9.71 LD Dec. 142015 XX169 11 m  < 10 LD Dec. 12, NHATS target
3.8   LD Dec. 172017 VT14 100 m  < 10 LD Dec. 13, uncertainty +/- 40 mins., risk, comet nucleus?
7.6   LD Dec. 242017 WZ14 31 m  < 10 LD Dec. 18, uncertainty +/- 54 mins.
3.7   LD Feb. 242017 DR109 10 m  < 10 LD Feb. 18, uncertainty +/- 30 mins., NHATS target
3.7   LD March 72017 VR12 268 m  < 10 LD Feb. 28, uncertainty +/- 1.2667 hours



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 29 November '17

The MPC's NEO Confirmation Page has 46 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 46 objects listed. Of these, fifteen were "one nighters." So far The Tracking News has counted a total of 53 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 29 November '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.


MPEC 2017-W215 - "16:59 UT" - 2017 WH28


MPEC 2017-W214 - "16:56 UT" - 2017 WG28


<< DOU on 29 Nov. '17 >>  MPEC 2017-W213 - "13:08 UT" - Daily Orbit Update

Observers  on 29 November '17

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPECs 2017-W213, 2017-W214 & 2017-W215 -- 2017 WZ, 2017 WX, 2017 WT1, 2017 WP, 2017 WH28, 2017 WG28, 2017 VY13, 2017 VX14, 2017 VN15, 2017 VG1, 2017 VE13, 2017 PS25
160Castelmartini Obs. in Italy, 14 in MPEC 2017-W213 -- 2017 VZ14, 2017 VU, 2017 VM2, 2017 VA15, 2014 YC15, 2008 AX28, 1998 WP7, 505178, 496005, 495858, 21374, 154991, 140158, 8037
703Catalina Sky Survey (CSS) in Arizona, 10 in MPEC 2017-W213 -- 2012 VF82, 2010 SA12, 99907, 53110, 496818, 159399, 15817, 141670, 11405, 1627
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2017-W215 -- 2017 WH28
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPEC 2017-W213 -- 2017 WS13, 2017 VW14, 2017 VD2, 2017 VC2, 234145
006Fabra Obs. in Spain, 2 in MPEC 2017-W213 -- 163696, 140158
E10*program code "*" (19) via Faulkes Telescope South in New South Wales, 2 in MPEC 2017-W213 -- 2017 WJ13, 2012 VF82
J95Great Shefford Obs. in England, 1 in MPEC 2017-W215 -- 2017 WH28
C41MASTER-II Kislovodsk in Russia, 2 in MPEC 2017-W213 -- 190208, 11066
G96Mt. Lemmon Survey (MLS) in Arizona, 19 in MPECs 2017-W213 & 2017-W215 -- 2017 WV13, 2017 WH28, 2017 VV14, 2017 VK2, 2017 VK13, 2017 UX44, 2007 VW137, 2000 KN44, 505093, 500749, 496005, 267337, 162472, 143651, 141079, 138175, 137052, 10150, 4450
Z80Northolt Branch Obs. in England, 3 in MPEC 2017-W213 -- 2017 VM2, 504680, 140158
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2017-W213 & 2017-W214 -- 2017 WG28, 2014 YK9
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-W213 -- 2017 UZ4
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-W213 -- 2017 WD15
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-W214 -- 2017 WG28
V78Spirit Marsh Obs. in Minnesota, 2 in MPEC 2017-W213 -- 3200, 3122
I52Steward Obs. Mt. Lemmon Station in Arizona, 8 in MPECs 2017-W213 & 2017-W215 -- 2017 WX12, 2017 WP13, 2017 WK15, 2017 WH28, 2017 WG13, 2017 WF15, 2017 WF13, 2017 UG8
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-W213 -- 2014 YK9
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-W213 -- 2012 GA5
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2017-W213 -- 3200
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 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.
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 WE28NEODyS16002051-2104127.05e-04-3.91-3.910NEODyS: "Based on 24 optical observations (of which 5 are rejected as outliers) from 2017-11-27.127 to 2017-11-28.145."
2017 WY27NEODyS16002062-2116121.12e-06-7.73-8.050NEODyS: "Based on 32 optical observations (of which 5 are rejected as outliers) from 2017-11-26.240 to 2017-11-28.244."
2017 WJ13JPL Sentry16302063-206315.781e-07-5.11-5.110JPL: Computed at 08:26 today Pacific time based on 40 observations spanning 3.8985 days (2017-Nov-22.52676 to 2017-Nov-26.42524). Diameter approximately 0.100 km. from weighted mean H=22.66.
2017 UE43NEODyS16002045-211382.83e-08-7.35-7.470NEODyS: "Based on 40 optical observations (of which 5 are rejected as outliers) from 2017-10-28.365 to 2017-11-27.415."

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 29 November '17

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

1742Generated Traffic Report
1730Grabbed MPEC 2017-W215 - 2017 WH28 - see above
1700Grabbed MPEC 2017-W214 - 2017 WG28 - see above
1630Noted that JPL Sentry has updated its 2017 WJ13 risk assessment - see above
1600Noted that NEODyS has updated its 2017 UE43 risk assessment - see above
Noted that NEODyS has posted 2017 WE28 as an impact risk - see above
Noted that NEODyS has posted 2017 WY27 as an impact risk - see above
Grabbed MPEC 2017-W213 - Daily Orbit Update - see above