Contents  on 23 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 23 November '17

Nine objects reported inside ten LD

Nine asteroidal objects are known to be less than ten lunar distances (LD) from our planet today. Nearest are 2017 VZ14, inbound from 4.23 to 3.31 LD, risk-listed intruder 2017 WW1 outbound from 3.38 to 6.17 LD, and 2017 WV1 heading out from 3.86 to 5.21 LD.

Earth passage I D ~Size Distance Today  Notes
0.37 LD Nov. 212017 WW1 4 m  3.38 to 6.17 LD intruder, risk
1.98 LD Nov. 202017 WB1 10 m  5.10 to 7.07 LD
2.02 LD Nov. 252017 VY13 17 m  4.87 from 7.08 LD DOU
2.58 LD Nov. 212017 WV1 7 m  3.86 to 5.21 LD
2.94 LD Nov. 202017 WC 22 m  5.72 to 7.23 LD radar target
3.01 LD Nov. 182017 WU1 15 m  7.93 to 9.50 LD
3.18 LD tomorrow2017 VZ14 35 m  3.31 from 4.23 LD DOU
6.16 LD Nov. 182017 VN2 11 m  7.78 to 8.49 LD risk
8.04 LD yesterday2017 VA15 33 m  8.05 to 8.27 LD

This report was generated at 1918 UTC with follow-up in today's DOU MPEC for three objects in the active traffic tables (above and below), and for five departed objects: 2017 VG1, 171576 1999 VP11, 496817 1989 VB, and including risk-listed objects 2017 VJ and intruder 2017 VL2.

Approaching (sorted by 10-LD bubble entry date)
3.8   LD Dec. 32008 WM61 15 m  < 10 LD tomorrow, uncertainty +/- 2.985 days, NHATS target
7.76 LD Nov. 282017 WK1 14 m  < 10 LD tomorrow
6.38 LD Nov. 302017 WH2 47 m  < 10 LD Nov. 28
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? - 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



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 23 November '17

The MPC's NEO Confirmation Page has 126 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 126 objects listed. Of these, 33 were "one nighters." So far The Tracking News has counted a total of 128 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 23 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 23 Nov. '17 >>  MPEC 2017-W109 - "13:07 UT" - Daily Orbit Update

Observers  on 23 November '17

A total of 24 observers appear in today's MPEC.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-W109 -- 2012 VF82
T05ATLAS Haleakala in Hawaii, 17 in MPEC 2017-W109 -- 2017 VY13, 2017 VM2, 2017 UZ42, 2012 VF82, 505178, 504680, 500749, 496817, 495858, 415029, 21374, 163696, 162273, 140158, 8037, 2212, 1980
T08ATLAS Mauna Loa in Hawaii, 15 in MPEC 2017-W109 -- 2017 VD2, 99907, 53110, 496818, 483560, 444193, 411201, 171576, 164121, 15817, 136923, 11405, 6050, 3361, 2202
160Castelmartini Obs. in Italy, 4 in MPEC 2017-W109 -- 2017 VU, 2017 SO17, 495858, 140158
703Catalina Sky Survey (CSS) in Arizona, 24 in MPEC 2017-W109 -- 2017 UE43, 2017 QL18, 2014 YC15, 2010 VT11, 96590, 85839, 85628, 505178, 505093, 504680, 500749, 496005, 495858, 415029, 323300, 303933, 20086, 19764, 162472, 154991, 136839, 8037, 3200, 2212
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPEC 2017-W109 -- 2017 VL2, 2017 UX42, 2017 SL12, 2017 SB14, 2017 OS68
D08Ghezz Obs. in Switzerland, 2 in MPEC 2017-W109 -- 162273, 144898
A17Guidestar Obs. in Germany, 6 in MPEC 2017-W109 -- 2017 WS1, 2017 VW13, 2017 VU14, 2017 VN15, 2017 VM2, 2017 UE45
246KLENOT in the Czech Republic, 14 in MPEC 2017-W109 -- 2017 WT1, 2017 WS1, 2017 VZ14, 2017 VY13, 2017 VW13, 2017 VU14, 2017 VU, 2017 VN15, 2017 VM2, 2017 VM13, 2017 VK1, 2017 UZ42, 2017 UZ4, 2012 VF82
130Lumezzane Obs. in Italy, 8 in MPEC 2017-W109 -- 2017 VU, 2017 QQ32, 2017 QL18, 2012 VF82, 2008 AX28, 506074, 457768, 140158
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-W109 -- 2017 QJ18
G96Mt. Lemmon Survey (MLS) in Arizona, 18 in MPEC 2017-W109 -- 2017 WV, 2017 VG1, 2017 HY50, 2014 WG365, 2000 KN44, 53319, 506074, 504392, 499307, 498068, 433960, 265187, 177651, 143992, 138175, 137052, 10150, 8201
C47Nonndorf Obs. in Austria, 1 in MPEC 2017-W109 -- 2017 VZ14
G34Oberfrauendorf Obs. in Germany, 2 in MPEC 2017-W109 -- 457768, 17182
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2017-W109 -- 505178, 142563
F51Pan-STARRS 1 (PS1) in Hawaii, 31 in MPEC 2017-W109 -- 2017 WV, 2017 VS14, 2017 VK2, 2017 VK13, 2017 VA2, 2017 UX4, 2017 UV5, 2017 TU6, 2017 QQ32, 2017 QL18, 2017 OQ68, 2017 HY50, 2014 PG51, 2005 YN3, 2004 SS, 2000 WL10, 85839, 505667, 504392, 433960, 417201, 381906, 35432, 329291, 311066, 174881, 140039, 112221, 9950, 8201, 2212
W98Polonia Obs. in Chile, 1 in MPEC 2017-W109 -- 140158
691Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2017-W109 -- 2017 WG2, 2017 VV, 2017 VJ, 2017 VD14, 2017 UY5, 2017 UY42, 2017 UX5, 2017 TN6, 2012 VF82, 2004 XP14, 1997 GC32
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2017-W109 -- 2017 VT14, 2017 UR4, 2017 UQ51, 2015 XK351, 2005 TU50, 1999 JE1
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-W109 -- 3122
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-W109 -- 2012 VF82
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-W109 -- 395207
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2017-W109 -- 3200
C51WISE in Earth polar orbit, 3 in MPEC 2017-W109 -- 505169, 154268, 6053
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 VT14JPL Sentry16302024-206731.1465904e-06-4.05-4.050JPL: Computed at 08:26 today Pacific time based on 32 observations spanning 9.3311 days (2017-Nov-13.76517 to 2017-Nov-23.09632). Diameter approximately 0.100 km. from weighted mean H=22.63.
2017 VW13JPL Sentry17012085-209733.05194e-07-4.63-4.670JPL: Computed at 08:34 today Pacific time based on 120 observations spanning 9.5190 days (2017-Nov-13.64011 to 2017-Nov-23.15909). Diameter approximately 0.260 km. from weighted mean H=20.61.
NEODyS1600209727.53e-07-4.24-4.240NEODyS: "Based on 109 optical observations (of which 6 are rejected as outliers) from 2017-11-13.641 to 2017-11-21.425."
2017 VL2JPL Sentry16302087-2115570.0001277979357-4.75-5.340JPL: Computed at 08:07 today Pacific time based on 51 observations spanning 11.868 days (2017-Nov-10.47521 to 2017-Nov-22.34325). Diameter approximately 0.021 km. from weighted mean H=26.09.
2017 VJJPL Sentry16302094-2117228.086712e-06-5.17-5.470JPL: Computed at 08:04 today Pacific time based on 46 observations spanning 17.809 days (2017-Nov-05.41077 to 2017-Nov-23.21978). Diameter approximately 0.041 km. from weighted mean H=24.59.
NEODyS16002094-2117336.68e-07-6.27-6.830NEODyS: "Based on 43 optical observations (of which 1 are rejected as outliers) from 2017-11-05.412 to 2017-11-22.291."
2017 UE43JPL Sentry16002045-211381.32645e-05-4.58-5.020JPL: Computed at 07:53 today Pacific time based on 33 observations spanning 25.119 days (2017-Oct-28.36401 to 2017-Nov-22.4826). Diameter approximately 0.058 km. from weighted mean H=23.82.

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 23 November '17

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

1918Generated Traffic Report
1701Noted that JPL Sentry has updated its 2017 VW13 risk assessment - see above
1630Noted that JPL Sentry has updated its 2017 VJ risk assessment - see above
Noted that JPL Sentry has updated its 2017 VL2 risk assessment - see above
Noted that JPL Sentry has updated its 2017 VT14 risk assessment - see above
1600Noted that JPL Sentry has updated its 2017 UE43 risk assessment - see above
Noted that NEODyS has updated its 2017 VJ risk assessment - see above
Noted that NEODyS has updated its 2017 VW13 risk assessment - see above
Grabbed MPEC 2017-W109 - Daily Orbit Update - see above