Contents  on 26 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 26 November '17

Ten objects reported inside ten LD

Ten visitors are known to be within ten lunar distances (LD) of our planet today. Nearest is 2017 WH13, which passed the Moon at 1.57 LD at 0249 UTC and Earth at 1.74 LD at 0544 UTC, and afterward leaves our sphere of gravitational influence, as does 2017 VY13 while moving away from 2.04 to 3.32 LD

Earth passage I D ~Size Distance Today  Notes
1.74 LD today2017 WH13 16 m  1.74 LD Moon closest 1.57 LD at 0249 UTC, Earth
closest at 0544 UTC, exits Earth SOI - DOU
2.02 LD yesterday2017 VY13 17 m  2.04 to 3.32 LD exits Earth SOI
2.58 LD Nov. 212017 WV1 7 m  8.25 to 9.83 LD
2.95 LD yesterday2017 WT12 12 m  3.11 to 5.19 LD
3.18 LD Nov. 242017 VZ14 32 m  4.27 to 5.70 LD DOU
3.67 LD Dec. 22008 WM61 15 m  6.82 from 7.72 LD NHATS target
6.91 LD yesterday2017 WZ13 18 m  7.00 to 7.80 LD
7.31 LD tomorrow2017 WC14 24 m  7.31 from 7.77 LD DOU
7.78 LD Nov. 282017 WK1 14 m  8.02 from 8.64 LD DOU
8.04 LD Nov. 222017 VA15 33 m  9.38 to 10.20 LD exits ten LD

This report was generated at 2010 UTC with follow-up in today's DOU MPEC for six objects in the active traffic tables here plus five departed objects: 2017 WB, 2017 VG1, 2017 VC, intruder 2017 WA14, and risk-listed 2017 WJ13.

Approaching (sorted by 10-LD bubble entry date)
6.38 LD Nov. 302017 WH2 47 m  < 10 LD Nov. 28 - DOU
9.44 LD Dec. 52017 WS13 39 m  < 10 LD Dec. 4 - DOU
3.4   LD Dec. 92017 WV12 25 m  < 10 LD Dec. 5, uncertainty +/- 1.4833 hours
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?
6.5   LD Dec. 202006 XY 54 m  < 10 LD Dec. 13, uncertainty +/- 2.430 days, NHATS target
3.7   LD Feb. 242017 DR109 10 m  < 10 LD Feb. 18, uncertainty +/- 30 mins., NHATS target
3.7   LD March 72017 VR12 275 m  < 10 LD Feb. 28, uncertainty +/- 2.1167 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 26 November '17

The MPC's NEO Confirmation Page has 92 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 92 objects listed. Of these, 28 were "one nighters." So far The Tracking News has counted a total of 107 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 26 November '17

Minor Planet Electronic Circulars

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


MPEC 2017-W163 - "19:11 UT" - 2013 TG5


<< DOU on 26 Nov. '17 >>  MPEC 2017-W162 - "13:05 UT" - Daily Orbit Update

Observers  on 26 November '17

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

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 8 in MPEC 2017-W162 -- 2004 VC17, 435302, 333888, 16834, 16657, 142040, 11066, 1036
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2017-W162 -- 475967, 10165
703Catalina Sky Survey (CSS) in Arizona, 10 in MPEC 2017-W162 -- 2017 SO17, 88188, 504025, 475967, 457768, 439908, 438897, 374851, 190208, 137062
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPEC 2017-W162 -- 2017 WY, 2017 WS13, 2017 WM2, 2017 WL13, 2017 WG1, 2017 QR17, 2017 QL35
K26Contern Obs. in Luxembourg, 2 in MPEC 2017-W162 -- 3200, 3122
J95Great Shefford Obs. in England, 2 in MPEC 2017-W162 -- 2017 WH13, 2017 WC14
C41MASTER-II Kislovodsk in Russia, 1 in MPEC 2017-W162 -- 137062
G96Mt. Lemmon Survey (MLS) in Arizona, 40 in MPEC 2017-W162 -- 2017 WW, 2017 WN1, 2017 WL2, 2017 WH2, 2017 WB, 2017 WA14, 2017 VV, 2017 VO15, 2017 VG15, 2017 UK2, 2017 SS19, 2017 QT35, 2017 QO17, 2016 UA42, 2012 XM145, 2012 WL4, 2009 TK8, 2008 SP7, 2008 KV28, 2004 XL29, 96744, 87024, 53319, 498068, 455956, 438430, 338176, 285567, 23714, 220839, 190166, 189058, 16834, 16657, 154988, 138911, 137799, 11500, 5189, 2201
J69North Obs. in England, 2 in MPEC 2017-W162 -- 2017 WK1, 2017 WC14
Z80Northolt Branch Obs. in England, 5 in MPEC 2017-W162 -- 2017 VM2, 2017 SO17, 1999 AF4, 163696, 3200
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-W162 -- 8037
I61Ourense Obs. in Spain, 1 in MPEC 2017-W162 -- 3200
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2017-W162 -- 189173
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 12 in MPEC 2017-W162 -- 2017 WL1, 2017 WJ13, 2017 VW13, 2017 VM2, 2017 VC, 2017 NL6, 2014 VU1, 2014 JC31, 2013 US3, 163696, 144898, 3200
D29Purple Mtn. Obs. Xuyi Station in China, 24 in MPEC 2017-W162 -- 2017 WJ13, 2017 SL2, 2015 BF4, 2014 JN57, 2010 VT11, 96631, 88264, 497176, 495891, 495858, 457768, 39572, 333888, 323300, 30825, 154991, 152742, 143651, 143404, 141079, 136849, 4486, 4450, 3671
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2017-W162 -- 2017 WH2, 2017 WG1, 2017 VG1, 2017 TN6, 2017 SV20, 2013 UP8, 2013 AA2
291Spacewatch 1.8m telescope in Arizona, 11 in MPEC 2017-W162 -- 2017 WG14, 2017 VS12, 2017 VJ13, 2017 TR1, 2017 TQ6, 2017 SE2, 2017 QM18, 2017 MB1, 2014 QK296, 2010 JF88, 2006 WY3
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-W162 -- 3200
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-W163 -- 2013 TG5
926Tenagra II Obs. in Arizona, 3 in MPECs 2017-W162 & 2017-W163 -- 2017 VZ14, 2015 BW510, 2013 TG5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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 WG14NEODyS2329203913.07e-11-10.05-10.050NEODyS: "Based on 12 optical observations (of which 1 are rejected as outliers) from 2017-11-21.256 to 2017-11-26.319."
2017 WJ13JPL Sentry17002063-206312.652e-07-5.45-5.450JPL: Computed at 08:30 today Pacific time based on 37 observations spanning 3.8985 days (2017-Nov-22.52676 to 2017-Nov-26.42524). Diameter approximately 0.099 km. from weighted mean H=22.66.
2017 VW13NEODyS2329209724.94e-07-4.43-4.440NEODyS: "Based on 135 optical observations (of which 6 are rejected as outliers) from 2017-11-13.641 to 2017-11-26.418."
JPL Sentry16302085-209723.443288e-07-4.59-4.590JPL: Computed at 07:52 today Pacific time based on 135 observations spanning 12.777 days (2017-Nov-13.64011 to 2017-Nov-26.41687). Diameter approximately 0.250 km. from weighted mean H=20.62.
2017 VJNEODyS01172094-2117233.71e-07-6.49-7.010NEODyS: "Based on 53 optical observations (of which 1 are rejected as outliers) from 2017-11-05.412 to 2017-11-24.358."
2017 UE43NEODyS01172045-2117131.48e-05-4.63-4.820NEODyS: "Based on 36 optical observations (of which 5 are rejected as outliers) from 2017-10-28.365 to 2017-11-25.423."

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 26 November '17

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

2329Noted that NEODyS has updated its 2017 VW13 risk assessment - see above
Noted that NEODyS has posted 2017 WG14 as an impact risk - see above
2010Generated Traffic Report
1948Grabbed MPEC 2017-W163 - 2013 TG5 - see above
1700Noted that JPL Sentry has updated its 2017 WJ13 risk assessment - see above
1630Noted that JPL Sentry has updated its 2017 VW13 risk assessment - see above
Grabbed MPEC 2017-W162 - Daily Orbit Update - see above
0117Noted that NEODyS has updated its 2017 UE43 risk assessment - see above
Noted that NEODyS has updated its 2017 VJ risk assessment - see above