Contents  on 22 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 22 November '17

Eleven objects reported inside ten LD

There are eleven minor planets reported inside ten lunar distances (LD) of Earth today. Nearest is risk-listed intruder 2017 WW1, which moves out from 0.66 to 3.38 LD, passing the Moon at 0.94 LD at 0018 UTC.

Earth passage I D ~Size Distance Today  Notes
0.37 LD yesterday2017 WW1 4 m  0.66 to 3.38 LD intruder today, exits Earth SOI, Moon
closest 0.94 LD at 0018 UTC - DOU
1.25 LD Nov. 182017 VC14 7 m  9.91 to 12.40 LD exits ten LD, risk
1.86 LD Nov. 152017 VV12 9 m  9.41 to 10.83 LD exits ten LD, risk
1.98 LD Nov. 202017 WB1 10 m  3.28 to 5.10 LD DOU
2.02 LD Nov. 252017 VY13 17 m  7.08 from 9.36 LD DOU
2.58 LD yesterday2017 WV1 7 m  2.86 to 3.86 LD DOU
2.94 LD Nov. 202017 WC 22 m  4.35 to 5.72 LD radar target - radar, DOU
3.01 LD Nov. 182017 WU1 15 m  6.41 to 7.93 LD DOU
3.18 LD Nov. 242017 VZ14 35 m  4.24 from 5.66 LD
6.16 LD Nov. 182017 VN2 11 m  7.17 to 7.78 LD risk
8.04 LD today2017 VA15 33 m  8.04 LD Earth closest at 1558 UTC - DOU

This report was generated at 2114 UTC with radar follow-up for departed 444584 2006 UK and optical follow-up in today's DOU MPEC for ten objects in the active traffic tables above and below, including outbound 2017 WC, which had radar observation posted late yesterday, and follow-up for five departed objects: 2017 WB, 2017 VU12, 2017 VG1, 2017 VA, and risk-listed 2017 VJ.

Approaching (sorted by 10-LD bubble entry date)
3.8   LD Dec. 32008 WM61 15 m  < 10 LD Nov. 24, uncertainty +/- 2.985 days, NHATS target
7.76 LD Nov. 282017 WK1 14 m  < 10 LD Nov. 24
6.38 LD Nov. 302017 WH2 47 m  < 10 LD Nov. 28 - DOU
9.71 LD Dec. 142015 XX169 11 m  < 10 LD Dec. 12, NHATS target
3.8   LD Dec. 172017 VT14 98 m  < 10 LD Dec. 13, uncertainty +/- 48 mins., risk, comet nucleus? - DOU
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 276 m  < 10 LD Feb. 28, uncertainty +/- 2.9167 hours - DOU



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.

Radar Astrometry  on 22 November '17

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 0027 UTC when the database was dated 21 Nov.

NEOCP Activity  on 22 November '17

The MPC's NEO Confirmation Page has 116 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 116 objects listed. Of these, 52 were "one nighters." So far The Tracking News has counted a total of 134 listings on the NEOCP today.

New MPECs  on 22 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-W108 - "23:38 UT" - 2015 GF1


<< DOU on 22 Nov. '17 >>  MPEC 2017-W107 - "13:06 UT" - Daily Orbit Update


MPEC 2017-W106 - "12:41 UT" - 2010 XJ

Observers  on 22 November '17

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2017-W107 -- 2017 VV1, 2017 VU12, 2017 VU, 2017 VG1, 2017 VE13, 2017 UZ4, 2017 UX44, 2017 UC5, 2017 SO17, 310402
T05ATLAS Haleakala in Hawaii, 30 in MPEC 2017-W107 -- 2017 VN15, 2017 PS30, 96631, 90075, 85709, 68950, 65679, 53319, 504711, 497176, 497117, 435302, 338176, 333908, 333888, 265962, 16657, 163696, 162998, 159399, 154589, 142040, 138852, 11066, 10115, 100926, 8567, 7977, 5189, 1865
T08ATLAS Mauna Loa in Hawaii, 22 in MPEC 2017-W107 -- 2017 VA15, 2017 SL2, 2014 YC15, 1999 AF4, 53430, 504680, 496005, 457768, 39572, 374851, 22771, 190208, 17511, 17182, 162472, 153415, 138205, 137062, 12711, 111253, 10165, 3200
703Catalina Sky Survey (CSS) in Arizona, 14 in MPEC 2017-W107 -- 2017 VW13, 2017 VG1, 2017 UE45, 2017 SO17, 2015 MW103, 2011 XO3, 475967, 438897, 190208, 162472, 137062, 10165, 6053, 1580
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPECs 2017-W106 & 2017-W107 -- 2017 WZ, 2017 WY, 2017 WW, 2017 WV, 2017 WU, 2017 VU13, 2017 VH2, 2017 UV42, 2017 UA8, 2017 TA4, 2010 XJ
595Farra d'Isonzo Obs. in Italy, 2 in MPEC 2017-W107 -- 2017 WV1, 2017 WT1
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 444584
Q60ISON Siding Spring Obs. in New South Wales, 1 in MPEC 2017-W107 -- 2015 MW103
168Kourovskaya Obs. in Russia, 1 in MPEC 2017-W107 -- 2017 PL26
C41MASTER-II Kislovodsk in Russia, 3 in MPEC 2017-W107 -- 96631, 162998, 1627
474Mt. John Obs. in New Zealand, 6 in MPEC 2017-W107 -- 2017 WW1, 2017 WU1, 2017 WN1, 2017 WB1, 2017 WB, 2017 VU13
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPEC 2017-W107 -- 2017 VA, 2014 QW296, 505093, 459046, 39572, 323300, 322763, 297418, 177614, 152931, 141079, 137924
F51Pan-STARRS 1 (PS1) in Hawaii, 47 in MPECs 2017-W107 & 2017-W108 -- 2017 VX14, 2017 VX1, 2017 VB2, 2017 UR7, 2017 UH44, 2017 UF52, 2017 UF5, 2017 TW4, 2017 TW3, 2017 QQ32, 2017 PS30, 2017 KS31, 2017 FJ90, 2017 CW1, 2015 WA2, 2015 VO66, 2015 MW103, 2015 KJ57, 2015 GF1, 2014 YP15, 2011 WD39, 2007 VL8, 2003 SJ154, 85709, 500749, 499490, 495858, 459451, 456536, 455432, 391211, 388468, 374851, 354101, 351370, 351278, 306523, 242708, 216707, 21374, 172718, 162385, 137125, 8034, 7336, 2062, 1865
Z38Picoto Obs., 3 in MPEC 2017-W107 -- 88188, 17511, 12711
D29Purple Mtn. Obs. Xuyi Station in China, 7 in MPEC 2017-W107 -- 504680, 457768, 438897, 374851, 162472, 138205, 137062
L04ROASTERR-1 in Romania, 1 in MPEC 2017-W107 -- 2017 WC
V83Rolling Hills Obs. in Missouri, 1 in MPEC 2017-W107 -- 3122
K14Sencelles Obs. in Spain, 1 in MPEC 2017-W107 -- 3122
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-W107 -- 2017 VW13
691Spacewatch 0.9m telescope in Arizona, 17 in MPEC 2017-W107 -- 2017 WV, 2017 WP1, 2017 WH2, 2017 WG2, 2017 VY13, 2017 VT14, 2017 VK13, 2017 VG1, 2017 VD14, 2017 VB2, 2017 UY42, 2017 TH6, 2017 SV20, 2017 SS19, 2014 XJ3, 2006 VW2, 303933
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2017-W107 -- 2017 VV, 2017 VJ, 2017 TS3
V78Spirit Marsh Obs. in Minnesota, 2 in MPEC 2017-W107 -- 3200, 3122
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPEC 2017-W107 -- 2017 WC, 2017 VR12
926Tenagra II Obs. in Arizona, 2 in MPEC 2017-W107 -- 2017 WE, 2017 VD13
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-W107 -- 2010 TE193, 2010 JM151
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-W107 -- 2010 TE193
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 WW1JPL Sentry17012055-205514.000e-08-9.52-9.520JPL: Computed at 08:41 today Pacific time based on 30 observations spanning 1.2287 days (2017-Nov-20.31298 to 2017-Nov-21.541722). Diameter approximately 0.004 km. from weighted mean H=29.71.
2017 VH15NEODyS16022023-211553.33e-10-6.11-6.740NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2017-11-02.598 to 2017-11-03.350."
2017 VT14NEODyS1602R E M O V E D-
JPL Sentry16312057-206722.3062e-07-5.59-5.600JPL: Computed at 08:22 today Pacific time based on 30 observations spanning 8.4524 days (2017-Nov-13.76517 to 2017-Nov-22.21758). Diameter approximately 0.098 km. from weighted mean H=22.70.
2017 VW13JPL Sentry17012085-209733.19638e-07-4.61-4.670JPL: Computed at 08:34 today Pacific time based on 109 observations spanning 7.7837 days (2017-Nov-13.64011 to 2017-Nov-21.42385). Diameter approximately 0.260 km. from weighted mean H=20.61.
2017 VJJPL Sentry16312094-2117351.9737862e-05-4.76-5.190JPL: Computed at 08:06 today Pacific time based on 43 observations spanning 16.879 days (2017-Nov-05.41077 to 2017-Nov-22.29). Diameter approximately 0.041 km. from weighted mean H=24.59.
2017 UG52NEODyS16022047-210322.08e-10-6.73-6.760NEODyS: "Based on 7 optical observations (of which 0 are rejected as outliers) from 2017-10-28.608 to 2017-10-29.582."
2017 UE52NEODyS16022020-2117361.04e-08-5.97-6.10NEODyS: "Based on 5 optical observations (of which 0 are rejected as outliers) from 2017-10-28.572 to 2017-10-30.358."
2017 UC52NEODyS16022067-211151.44e-07-6.44-6.520NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2017-10-28.510 to 2017-10-29.530."

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 22 November '17

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

2358Grabbed MPEC 2017-W108 - 2015 GF1 - see above
2114Generated Traffic Report
1701Noted that JPL Sentry has updated its 2017 VW13 risk assessment - see above
Noted that JPL Sentry has updated its 2017 WW1 risk assessment - see above
1631Noted that JPL Sentry has updated its 2017 VJ risk assessment - see above
Noted that JPL Sentry has updated its 2017 VT14 risk assessment - see above
1602Noted that NEODyS has posted 2017 UC52 as an impact risk - see above
Noted that NEODyS has posted 2017 UE52 as an impact risk - see above
Noted that NEODyS has posted 2017 UG52 as an impact risk - see above
Noted that NEODyS has posted 2017 VH15 as an impact risk - see above
Noted that NEODyS has removed 2017 VT14 as an impact risk - see above
Grabbed MPEC 2017-W106 - 2010 XJ - see above
Grabbed MPEC 2017-W107 - Daily Orbit Update - see above
0027Noted Radar Astrometry database update - see above