Contents  on 18 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 18 November '17

Eight objects reported inside ten LD

Today eight Solar-System small bodies are known to be less than ten lunar distances (LD) from our planet. Nearest is risk-listed 2017 VC14, which comes its closest to Earth this time around, reaching 1.25 LD at 0144 UTC, also its closest to the Moon -- 1.79 LD at 0907 UTC, and leaves Earth's SOI (sphere of gravitational influence).

Earth passage I D ~Size Distance Today  Notes
1.25 LD today2017 VC14 7 m  1.25 LD Earth closest at 0144 UTC, Moon closest
1.79 LD at 0907 UTC, exits Earth SOI, risk
1.86 LD Nov. 152017 VV12 9 m  3.91 to 5.23 LD risk - DOU
2.94 LD Nov. 202017 WC 22 m  3.50 from 4.65 LD DOU
2.97 LD Nov. 152017 VN13 9 m  5.22 to 6.95 LD
6.16 LD today2017 VN2 11 m  6.16 LD Earth closest at 1446 UTC, risk - DOU
7.36 LD Nov. 152017 WB 31 m  8.54 to 9.70 LD DOU
8.04 LD Nov. 222017 VA15 35 m  9.66 from 10.54 LD enters ten LD - DOU
8.66 LD yesterday444584 2006 UK 309 m  8.67 to 9.43 LD DOU

This report was generated at 2000 UTC with today's DOU MPEC announcing the discovery of long departed intruder 2017 UA52, which flew past us at about 0.51 LD on October 21st (uncertainty +/- 61 minutes) after buzzing the Moon the previous day at around 0.11 LD, inside the lunar SOI. If that passage held up after future observation, it would be the second closest to the Moon in the almost eleven years now that A/CC has been keeping track, and the second within the Moon's SOI in two months (after 2017 SS12 in late September).
        Today's DOU has first follow-up for inbound 2017 WC and 2017 VA15, approaching risk-listd 2017 VT14, and departed risk-listed intruder 2017 VF14, additional observation of outbound 2017 WB, and continuing follow-up for approaching 2017 VY13 and 2017 VR12 (no longer risk listed), outbound 444584 2006 UK, and risk-listed outbound 2017 VV12 and passing 2017 VN2, along with departed objects 2017 VU12, 2017 VG1, and 2017 VC.
        Today we have added to this reporting returning objects 2017 DR109 and 2006 XY. Yesterday we added 2015 XX169.

APPROACHING (sorted by 10-LD bubble entry date)
3.18 LD Nov. 242017 VZ14 36 m  < 10 LD tomorrow
2.02 LD Nov. 252017 VY13 17 m  < 10 LD Nov. 21 - DOU
3.8   LD Dec. 32008 WM61 15 m  < 10 LD Nov. 24, uncertainty +/- 2.985 days, NHATS target
9.71 LD Dec. 142015 XX169 11 m  < 10 LD Dec. 12, NHATS target
3.8   LD Dec. 172017 VT14 110 m  < 10 LD Dec. 13, uncertainty +/- 4.6000 hours, risk, comet? - 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 277 m  < 10 LD Feb. 28, uncertainty +/- 9.0667 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.

NEOCP Activity  on 18 November '17

The MPC's NEO Confirmation Page has 93 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 93 objects listed. Of these, 48 were "one nighters." So far The Tracking News has counted a total of 101 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 18 November '17

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 18 Nov. '17 >>  MPEC 2017-W48 - "13:05 UT" - Daily Orbit Update


MPEC 2017-W47 - "04:30 UT" - 2015 DC200

Observers  on 18 November '17

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2017-W48 -- 2017 WB, 2017 VQ14, 2017 VP14, 2017 VD15, 2017 UA52
T05ATLAS Haleakala in Hawaii, 28 in MPEC 2017-W48 -- 2017 VC2, 2017 UZ4, 2017 PS30, 2000 YG29, 99907, 96631, 90075, 87311, 87024, 86819, 65679, 53319, 504711, 497176, 435302, 333888, 265962, 242211, 21374, 16657, 163696, 162998, 154589, 142040, 100926, 5189, 1865, 1036
T08ATLAS Mauna Loa in Hawaii, 14 in MPEC 2017-W48 -- 2017 VW13, 2017 SL2, 2014 YC15, 504887, 496005, 475967, 457768, 190208, 17182, 162472, 137062, 10165, 3200, 1580
160Castelmartini Obs. in Italy, 11 in MPEC 2017-W48 -- 2017 VU, 2017 VM2, 2014 YC15, 1998 WP7, 505178, 504711, 500749, 496005, 21374, 159399, 5189
703Catalina Sky Survey (CSS) in Arizona, 18 in MPEC 2017-W48 -- 2017 VG1, 2017 VA15, 2017 UE45, 2011 XO3, 88188, 504025, 475967, 374851, 22771, 190208, 17511, 17182, 162472, 137062, 111253, 10165, 1864, 1580
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2017-W48 -- 2017 UA52
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPEC 2017-W48 -- 2017 VV1, 2017 UZ42, 2017 ST16, 2017 SS19, 2017 SN17, 2017 RE16, 2017 HW1
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2017-W48 -- 2017 VR12
006Fabra Obs. in Spain, 2 in MPEC 2017-W48 -- 444584, 1980
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2017-W48 -- 504887
B15Inastars Obs. in Germany, 2 in MPEC 2017-W48 -- 2017 WC, 504887
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2017-W48 -- 2017 UF52
246KLENOT in the Czech Republic, 1 in MPEC 2017-W48 -- 2017 UZ42
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2017-W47 & 2017-W48 -- 2017 UF52, 2017 UA52, 2015 DC200
G96Mt. Lemmon Survey (MLS) in Arizona, 31 in MPEC 2017-W48 -- 2017 UZ42, 2017 UX44, 2017 UR4, 2017 UA52, 2017 TX3, 2017 SO14, 2015 XK1, 2015 MW103, 2013 YY13, 2012 VF82, 99248, 96631, 90075, 86819, 503892, 499998, 476187, 455956, 420302, 338176, 285567, 265962, 222073, 20429, 16834, 162694, 142040, 136745, 11500, 8567, 6611
G34Oberfrauendorf Obs. in Germany, 3 in MPEC 2017-W48 -- 2017 VM2, 2017 VC, 2017 SO17
F51Pan-STARRS 1 (PS1) in Hawaii, 39 in MPEC 2017-W48 -- 2017 VY13, 2017 VU12, 2017 VH15, 2017 VE15, 2017 VD14, 2017 UZ51, 2017 UZ42, 2017 UG52, 2017 UF52, 2017 UE52, 2017 UD52, 2017 UC52, 2017 UC5, 2016 UA42, 2015 XK1, 2015 TM237, 2014 XJ3, 2014 PG51, 2014 GM1, 2012 VF82, 2011 VV5, 2010 VT11, 2008 WQ63, 2002 AL14, 85184, 504392, 499998, 471956, 415715, 354332, 350536, 33342, 303933, 226514, 162186, 154991, 138971, 5189, 1627
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-W48 -- 504887
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-W48 -- 504887
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-W48 -- 2017 VG1
033Schwarzschild Obs. in Germany, 3 in MPEC 2017-W48 -- 2017 WC, 2017 VA13, 504887
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-W48 -- 496005
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2017-W48 -- 2017 VO14, 2017 VF14, 2017 UZ4, 2017 UC52, 2015 MW103, 226514
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2017-W47 & 2017-W48 -- 2017 VT14, 2017 VG13, 2017 VD14, 2017 UE52, 2015 DC200
I52Steward Obs. Mt. Lemmon Station in Arizona, 3 in MPEC 2017-W48 -- 2017 VR12, 2017 VN2, 2017 UA52
926Tenagra II Obs. in Arizona, 4 in MPECs 2017-W47 & 2017-W48 -- 2017 VV12, 2017 VH15, 2015 DC200, 504887
Z52The Studios Obs., 1 in MPEC 2017-W48 -- 1980
W33Transit Dreams Obs., 6 in MPEC 2017-W48 -- 2017 VM2, 17511, 17182, 8037, 3361, 3200
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-W48 -- 2005 TB15
K41Vegaquattro Obs. in Italy, 1 in MPEC 2017-W48 -- 2017 VM2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 November '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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 Sentry17002024-210127.926286e-06-3.04-3.040JPL: Computed at 08:31 today Pacific time based on 21 observations spanning 4.3175 days (2017-Nov-13.76517 to 2017-Nov-18.08266). Diameter approximately 0.110 km. from weighted mean H=22.38.
NEODyS17002024-210642.15e-05-2.63-2.680NEODyS: "Based on 18 optical observations (of which 1 are rejected as outliers) from 2017-11-13.766 to 2017-11-16.840."
2017 VF14JPL Sentry17002080-209478.8707e-07-7.84-8.250JPL: Computed at 08:46 today Pacific time based on 27 observations spanning 3.1402 days (2017-Nov-15.33557 to 2017-Nov-18.47578). Diameter approximately 0.007 km. from weighted mean H=28.39.
2017 VC14NEODyS17002064-211265.09e-08-9.18-9.60NEODyS: "Based on 37 optical observations (of which 8 are rejected as outliers) from 2017-11-15.247 to 2017-11-17.025."
2017 VW13JPL Sentry17002085-209733.38e-07-4.58-4.680JPL: Computed at 08:39 today Pacific time based on 89 observations spanning 3.9901 days (2017-Nov-13.64011 to 2017-Nov-17.63022). Diameter approximately 0.260 km. from weighted mean H=20.61.
NEODyS1700209725.68e-07-4.36-4.370NEODyS: "Based on 80 optical observations (of which 2 are rejected as outliers) from 2017-11-13.641 to 2017-11-17.444."
2017 VV12JPL Sentry17002062-2116104.38365e-06-7.07-7.330JPL: Computed at 08:00 today Pacific time based on 79 observations spanning 3.3231 days (2017-Nov-14.21186 to 2017-Nov-17.53494). Diameter approximately 0.009 km. from weighted mean H=28.00.
NEODyS17002062-2116136.49e-06-6.84-6.970NEODyS: "Based on 74 optical observations (of which 15 are rejected as outliers) from 2017-11-14.202 to 2017-11-17.145."
2017 VR12JPL Sentry1700R E M O V E DJPL: Risk listing removed at 1610 UTC today
NEODyS1700R E M O V E D-
2017 VL2NEODyS17002087-2115472.21e-05-5.52-5.610NEODyS: "Based on 34 optical observations (of which 1 are rejected as outliers) from 2017-11-10.476 to 2017-11-17.116."
2017 VJNEODyS17002094-2117413.1e-06-5.55-6.130NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2017-11-05.412 to 2017-11-16.909."
2017 UC52JPL Sentry17002046-2116434.005366e-07-5.93-6.520JPL: Computed at 07:56 today Pacific time based on 11 observations spanning 1.0204 days (2017-Oct-28.5087 to 2017-Oct-29.52911). Diameter approximately 0.048 km. from weighted mean H=24.27.
2017 UR51NEODyS17002043-2117173.17e-06-4.28-4.740NEODyS: "Based on 33 optical observations (of which 1 are rejected as outliers) from 2017-10-30.522 to 2017-11-17.179."
2017 UA45NEODyS17002074-2117753.93e-05-5.35-5.810NEODyS: "Based on 30 optical observations (of which 9 are rejected as outliers) from 2017-10-27.475 to 2017-11-16.892."
2017 UE43NEODyS17002045-2117151.76e-05-4.53-4.840NEODyS: "Based on 27 optical observations (of which 2 are rejected as outliers) from 2017-10-28.365 to 2017-11-16.985."

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 18 November '17

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

2000Generated Traffic Report
1700Noted that NEODyS has updated its 2017 UA45 risk assessment - see above
Noted that JPL Sentry has posted 2017 UC52 as an impact risk - see above
Noted that NEODyS has updated its 2017 UE43 risk assessment - see above
Noted that NEODyS has updated its 2017 UR51 risk assessment - see above
Noted that NEODyS has updated its 2017 VC14 risk assessment - see above
Noted that JPL Sentry has updated its 2017 VF14 risk assessment - see above
Noted that NEODyS has updated its 2017 VJ risk assessment - see above
Noted that NEODyS has updated its 2017 VL2 risk assessment - see above
Noted that JPL Sentry has removed 2017 VR12 as an impact risk - see above
Noted that NEODyS has removed 2017 VR12 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 VT14 risk assessment - see above
Noted that NEODyS has posted 2017 VT14 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 VV12 risk assessment - see above
Noted that NEODyS has updated its 2017 VV12 risk assessment - see above
Noted that JPL Sentry has updated its 2017 VW13 risk assessment - see above
Noted that NEODyS has updated its 2017 VW13 risk assessment - see above
Grabbed MPEC 2017-W48 - Daily Orbit Update - see above
0534Grabbed MPEC 2017-W47 - 2015 DC200 - see above