Contents  on 27 November '18

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 27 November '18

Five objects reported inside ten LD

Five minor objects are reported to be less than ten lunar distances (LD) from our home world today. The nearest of these, 2018 TG6, is inbound from 4.23 to 4.13 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
0.65 LD Nov. 13 2018 WA1 3 m  8.51 to 9.13 LD Oct. 29 - Nov. 29 intruder, NHATS target, risk
3.92 LD Dec. 2 2018 TG6 12 m  4.13 from 4.23 LD Oct. 30 - Jan. 5 NHATS target - DOU
4.52 LD Nov. 24 2018 WD 47 m  9.12 to 11.86 LD Nov. 21 - 27 exits ten LD
7.4   LD today* 2008 WD14 89 m  7.4 LD Nov. 23 - 30 EPU +/- 2.04 days*, Earth closest at 0014 UTC
8.21 LD Nov. 25 2018 VT7 9 m  8.23 to 8.29 LD Nov. 15 - Dec. 7 NHATS target
* EPU = Earth passage uncertainty

This report was generated at 1940 UTC with the recovery of distant 418094 2007 WV4 in today's DOU MPEC along with follow-up for approaching 2018 VO9, inbound 2018 TG6, and departed 2008 WS62, plus astrometry from late October for 2018 TF3.
        Among observations of comet 46P/Wirtanen (MPEC) reported today is the first posting of MPEC astrometry from Canada's NEO Surveillance Satellite (NEOSSat). About the size of a large suitcase, this spacecraft has had problems since its launch into Earth orbit in early 2013.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
2.62 LD Dec. 15 2018 VO9 14 m  11.05 from 11.62 LD Nov. 29 - Dec. 31 NHATS target, risk - DOU
4.1   LD Dec. 9* 2013 VX4 62 m  17.7 from 19.1 LD Dec. 3 - 15 EPU +/- 2.35 days*
7.84 LD Dec. 10 2001 XG1 74 m  39.92 from 43.20 LD Dec. 8 - 12
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  33.23 from 34.47 LD Dec. 17 - 26 radar/NHATS target
7.3   LD Jan. 9* 2013 YM2 19 m  41.3 from 42.1 LD Jan. 2 - 16 EPU +/- 1.25 days*, NHATS target



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. "Distant" is used here to describe an object that has come within ten LD since A/CC began these traffic reports (2007) but is not presently so close. Object temporal 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 27 November '18

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 2003 UTC when the database was dated 27 Nov.

NEOCP Activity  on 27 November '18

The MPC's NEO Confirmation Page has 28 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 28 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 31 listings on the NEOCP today.

New MPECs  on 27 November '18

Minor Planet Electronic Circulars

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


MPEC 2018-W64 - "21:53 UT" - 2008 WD14


MPEC 2018-W63 - "21:16 UT" - 2018 DF2


MPEC 2018-W62 - "21:10 UT" - 2016 NN39


MPEC 2018-W61 - "21:00 UT" - 2005 EZ


MPEC 2018-W60 - "19:45 UT" - Requirements for the New MPC Observation Acceptance Pipeline


MPEC 2018-W59 - "18:12 UT" - Comet 46P/Wirtanen


<< DOU on 27 Nov. '18 >>  MPEC 2018-W58 - "13:06 UT" - Daily Orbit Update


MPEC 2018-W57 - "12:00 UT" - 2018 WC1


MPEC 2018-W56 - "11:57 UT" - 2018 WB1


MPEC 2018-W55 - "04:30 UT" - 2015 BY518


MPEC 2018-W54 - "04:28 UT" - 2014 XW40

Observers  on 27 November '18

A total of 40 observers appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 1 in MPEC 2018-W59 -- 46P
J24Altamira Obs. in the Canary Islands, 1 in MPEC 2018-W59 -- 46P
251Arecibo in Puerto Rico, 1 in radar -- 2001 SP263
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPECs 2018-W56 & 2018-W58 -- 2018 WB1, 2018 UG3, 2018 LX15, 2013 NT11, 1998 QQ, 97725, 369296, 8013
T05ATLAS Haleakala in Hawaii, 15 in MPECs 2018-W58 & 2018-W64 -- 2009 TK8, 2008 WD14, 86324, 65706, 523824, 523604, 457260, 454177, 450779, 345705, 20460, 16816, 3552, 3200, 1620
T08ATLAS Mauna Loa in Hawaii, 18 in MPECs 2018-W58 & 2018-W59 -- 2009 WB105, 523815, 523628, 518735, 518635, 455550, 438429, 427643, 414903, 256412, 20790, 18109, 17274, 153591, 13553, 12538, 5143, 46P
Q68Blue Mountains Obs. in New South Wales, 1 in MPEC 2018-W59 -- 46P
W96Campo Catino Austral Obs. in Chile, 1 in MPEC 2018-W59 -- 46P
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2018-W61, 2018-W62 & 2018-W63 -- 2018 DF2, 2016 NN39, 2005 EZ
A77Chante-Perdrix Obs. in France, 1 in MPEC 2018-W59 -- 46P
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-W59 -- 46P
N55Corona Borealis Obs. in Tibet, 1 in MPEC 2018-W59 -- 46P
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-W59 -- 46P
Q626Erik Bryssinck in Belgium via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-W59 -- 46P
Q67JBL Obs., 1 in MPEC 2018-W59 -- 46P
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPECs 2018-W56 & 2018-W57 -- 2018 WC1, 2018 WB1
L12Koksijde Obs., 1 in MPEC 2018-W59 -- 46P
D95Kurihara Obs. in Japan, 1 in MPEC 2018-W59 -- 46P
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2018-W59 -- 46P
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2018-W56, 2018-W57 & 2018-W59 -- 2018 WC1, 2018 WB1, 46P
213Montcabre Obs. in Spain, 1 in MPEC 2018-W59 -- 46P
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2018-W56 & 2018-W57 -- 2018 WC1, 2018 WB1
C53NEOSSat in Earth orbit, 1 in MPEC 2018-W59 -- 46P
J69North Obs. in England, 1 in MPEC 2018-W58 -- 2018 QN1
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2018-W58 -- 2018 TF3
I41Palomar Transient Factory (PTF) in southern California, 6 in MPEC 2018-W58 -- 2018 VT8, 2013 VD13, 275611, 152931, 11311, 1863
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2018-W54, 2018-W55 & 2018-W64 -- 2015 BY518, 2014 XW40, 2008 WD14
F52Pan-STARRS 2 (PS2) in Hawaii, 6 in MPEC 2018-W58 -- 2011 KN9, 337252, 20826, 16834, 162168, 3691
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2018-W56 -- 2018 WB1
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2018-W58 -- 2010 GT7
G39ROAD in Chile, 1 in MPEC 2018-W59 -- 46P
C95SATINO-1 in France, 1 in MPEC 2018-W58 -- 2010 AK
W88!program code "!" (10) via Slooh.com Chile Obs. in Chile, 2 in MPECs 2018-W58 & 2018-W59 -- 12538, 46P
W88%program code "%" (14) via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-W59 -- 46P
W883B. Lutkenhoner in Germany via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-W59 -- 46P
691Spacewatch 0.9m telescope in Arizona, 29 in MPEC 2018-W58 -- 2018 WB, 2018 VZ1, 2018 VX6, 2018 VX, 2018 VW6, 2018 VW1, 2018 VS9, 2018 VN5, 2018 VM3, 2018 VA9, 2018 UY, 2018 UN1, 2018 TY2, 2018 TX4, 2018 TL2, 2018 TK2, 2018 TC3, 2018 RU5, 2018 RP8, 2017 NK, 2016 OP5, 2016 CX264, 2011 WM46, 2010 GT7, 2009 WB105, 2008 WS62, 2003 NW1, 2002 GA, 1998 YF10
291Spacewatch 1.8m telescope in Arizona, 12 in MPEC 2018-W58 -- 2018 VV, 2018 VU6, 2018 VO9, 2018 VK10, 2018 VA5, 2018 UM1, 2018 UJ1, 2018 TO6, 2018 TG6, 2018 SN, 2018 LK2, 2018 LB1
I52Steward Obs. Mt. Lemmon Station in Arizona, 47 in MPECs 2018-W56, 2018-W57 & 2018-W58 -- 2018 WW, 2018 WP, 2018 WO, 2018 WM, 2018 WC1, 2018 WB1, 2018 WB, 2018 VZ8, 2018 VZ3, 2018 VZ1, 2018 VX8, 2018 VX, 2018 VW5, 2018 VV1, 2018 VT8, 2018 VT3, 2018 VS9, 2018 VS, 2018 VQ3, 2018 VP9, 2018 VN3, 2018 VM3, 2018 VK5, 2018 VK10, 2018 VJ5, 2018 VH2, 2018 VH1, 2018 VG8, 2018 VG10, 2018 VF3, 2018 VE4, 2018 VC5, 2018 VB9, 2018 VB4, 2018 VA9, 2018 UZ, 2018 UG3, 2018 TS5, 2018 SN, 2018 RU5, 2018 QN1, 2018 PL9, 2018 PJ22, 2018 PE22, 2018 NR, 2018 LQ15, 2015 ME54
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2018-W59 -- 46P
I81Tarbatness Obs. in Scotland, 1 in MPEC 2018-W59 -- 46P
W33Transit Dreams Obs., 1 in MPEC 2018-W59 -- 46P
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-W59 -- 46P
C51WISE in Earth polar orbit, 5 in MPEC 2018-W58 -- 2018 TC3, 2018 PL9, 2003 AO4, 418094, 138937
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 November '18

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 and NEODyS listings is 100 years, and both post impact solutions beyond that for some 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
2018 VO9JPL Sentry16302102-2110190.00021862931-5.04-5.510JPL: Computed at 07:43 today Pacific time based on 19 observations spanning 17.841 days (2018-Nov-09.26967 to 2018-Nov-27.11065). Diameter approximately 0.014 km. from weighted mean H=26.85.

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 27 November '18

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

2203Grabbed MPEC 2018-W64 - 2008 WD14 - see above
2136Grabbed MPEC 2018-W62 - 2016 NN39 - see above
Grabbed MPEC 2018-W63 - 2018 DF2 - see above
2105Grabbed MPEC 2018-W61 - 2005 EZ - see above
2003Grabbed MPEC 2018-W60 - Requirements for the New MPC Observation Acceptance Pipeline - see above
Noted Radar Astrometry database update - see above
1940Generated Traffic Report
1836Grabbed MPEC 2018-W59 - Comet 46P/Wirtanen - see above
1630Noted that JPL Sentry has updated its 2018 VO9 risk assessment - see above
Grabbed MPEC 2018-W56 - 2018 WB1 - see above
Grabbed MPEC 2018-W57 - 2018 WC1 - see above
Grabbed MPEC 2018-W58 - Daily Orbit Update - see above
0440Grabbed MPEC 2018-W54 - 2014 XW40 - see above
Grabbed MPEC 2018-W55 - 2015 BY518 - see above