Contents  on 6 December '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 6 December '18

Eleven objects reported inside ten LD

Eleven Solar-System small bodies are reported within ten lunar distances (LD) of our home world today. Nearest, and still inside Earth's SOI, risk-listed intruder 2018 WV1 moves out from 1.96 to 2.39 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
0.09 LD Dec. 2 2018 WV1 3 m  1.96 to 2.39 LD Nov. 8 - Dec. 25 intruder, NHATS target, inside Earth SOI, risk - DOU
0.52 LD Nov. 30 2018 WG2 3 m  7.64 to 9.10 LD Nov. 23 - tomorrow intruder, NHATS target, risk
1.18 LD Nov. 25 2018 WH1 7 m  9.29 to 10.19 LD Nov. 15 - today Moon buzzer, NHATS target, exits ten LD, risk
2.06 LD Dec. 3 2018 XB 7 m  3.91 to 5.13 LD Nov. 26 - Dec. 10 NHATS target
2.62 LD Dec. 15 2018 VO9 14 m  5.91 from 6.47 LD Nov. 29 - Dec. 31 NHATS target, risk
3.42 LD Dec. 4 2018 WD2 21 m  3.91 to 4.96 LD Nov. 29 - Dec. 10
3.77 LD tomorrow 2018 XG 16 m  3.82 from 4.61 LD Dec. 2 - 11 DOU
3.92 LD Dec. 2 2018 TG6 12 m  4.03 to 4.10 LD Oct. 30 - Jan. 5 NHATS target
4.1   LD Dec. 9* 2013 VX4 62 m  5.7 from 6.9 LD Dec. 3 - 15 EPU +/- 2.35 days*
4.82 LD tomorrow 2018 WX1 52 m  4.88 from 5.57 LD Dec. 3 - 11 NHATS target - DOU
8.21 LD Nov. 25 2018 VT7 9 m  9.67 to 9.94 LD Nov. 15 - tomorrow NHATS target
* EPU = Earth passage uncertainty

This report was generated at 2010 UTC with radar observation of approaching behemoth 163899 2003 SD220 and with follow-up in today's DOU MPEC for inbound objects 2018 XG and 2018 WX1, outbound risk-listed intruder 2018 WV1, and departed risk-listed 2018 XA, plus astrometry from early and mid-November for 2018 WT1, 2018 WM1, 2018 VA2, 2018 UQ1, and risk-listed intruder 2018 WJ.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
7.84 LD Dec. 10 2001 XG1 74 m  12.57 from 15.21 LD Dec. 8 - 12
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  21.94 from 23.20 LD Dec. 17 - 26 radar/NHATS target - radar
7.3   LD Jan. 9* 2013 YM2 19 m  33.1 from 34.0 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. Object temporal distances are derived by A/CC from JPL Horizons data. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

Radar Astrometry  on 6 December '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 1700 UTC when the database was dated 6 Dec.

NEOCP Activity  on 6 December '18

The MPC's NEO Confirmation Page has 30 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 30 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 43 listings on the NEOCP today.

New MPECs  on 6 December '18

Minor Planet Electronic Circulars

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


MPEC 2018-X51 - "22:01 UT" - 2018 XR


MPEC 2018-X50 - "18:36 UT" - 2013 BT18


MPEC 2018-X49 - "16:53 UT" - Comet P/2005 GF8 = 2018 X1 (LONEOS)


<< DOU on 6 Dec. '18 >>  MPEC 2018-X48 - "13:06 UT" - Daily Orbit Update


MPEC 2018-X47 - "03:31 UT" - 2018 XO


MPEC 2018-X46 - "03:27 UT" - 2018 XN


MPEC 2018-X45 - "02:19 UT" - 2009 XV1

Observers  on 6 December '18

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 4 in MPECs 2018-X48, 2018-X50 & 2018-X51 -- 2018 XR, 2018 QN1, 2013 BT18, 2009 SV17
T08ATLAS Mauna Loa in Hawaii, 2 in MPECs 2018-X45 & 2018-X50 -- 2013 BT18, 2009 XV1
160Castelmartini Obs. in Italy, 3 in MPEC 2018-X48 -- 2003 NW1, 345705, 154656
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPEC 2018-X48 -- 2018 WC2, 2018 VF1
K51Celado Obs. in Italy, 4 in MPEC 2018-X48 -- 2018 WW1, 2018 WT1, 2018 WS1, 2018 WM1
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-X51 -- 2018 XR
W84%program code "%" (14) via DECam in Chile, 1 in MPEC 2018-X48 -- 2016 JT38
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 7 in MPECs 2018-X45, 2018-X46, 2018-X47, 2018-X48, 2018-X49 & 2018-X51 -- 2018 XR, 2018 XO, 2018 XN, 2018 XH, P/2018 X1, 2018 WV1, 2009 XV1
157Frasso Sabino Obs. in Italy, 3 in MPEC 2018-X48 -- 2018 WR1, 2018 TP2, 446938
X31Galilei Obs., 1 in MPEC 2018-X45 -- 2009 XV1
K88GINOP-KHK in Hungary, 2 in MPECs 2018-X46 & 2018-X51 -- 2018 XR, 2018 XN
E94Gisborne Obs. in New Zealand, 1 in MPEC 2018-X45 -- 2009 XV1
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 163899
K73Gravina Obs. in Italy, 1 in MPEC 2018-X48 -- 433
J95Great Shefford Obs. in England, 3 in MPECs 2018-X45 & 2018-X48 -- 2018 XG, 2018 WX1, 2009 XV1
K38M57 Obs. in Italy, 1 in MPEC 2018-X51 -- 2018 XR
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2018-X46, 2018-X47 & 2018-X48 -- 2018 XO, 2018 XN, 2018 VQ8
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2018-X48 -- 2018 VS9
474Mt. John Obs. in New Zealand, 1 in MPEC 2018-X50 -- 2013 BT18
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2018-X46 & 2018-X47 -- 2018 XO, 2018 XN
0895N.V. Maigurova via Nikolaev Obs. in Ukraine, 8 in MPEC 2018-X48 -- 2018 VA2, 2018 UR2, 2018 UQ1, 2018 TT1, 2018 TQ2, 88263, 455550, 442742
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-X51 -- 2018 XR
J69North Obs. in England, 1 in MPEC 2018-X48 -- 2018 WV1
I41Palomar Transient Factory (PTF) in southern California, 12 in MPEC 2018-X48 -- 2018 VZ9, 2012 GS5, 523628, 454177, 42286, 325769, 275611, 265661, 17274, 141079, 13553, 1943
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2018-X48 & 2018-X50 -- 2015 JV, 2013 BT18
K63Pascoli Obs. in Italy, 2 in MPECs 2018-X45 & 2018-X51 -- 2018 XR, 2009 XV1
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2018-X48 -- 2018 VK10
L04ROASTERR-1 in Romania, 2 in MPECs 2018-X45 & 2018-X51 -- 2018 XR, 2009 XV1
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2018-X45, 2018-X46 & 2018-X51 -- 2018 XR, 2018 XN, 2009 XV1
C95SATINO-1 in France, 1 in MPEC 2018-X48 -- 2005 WF57
204Schiaparelli Obs. in Italy, 3 in MPECs 2018-X45, 2018-X46 & 2018-X51 -- 2018 XR, 2018 XN, 2009 XV1
033Schwarzschild Obs. in Germany, 3 in MPECs 2018-X46, 2018-X47 & 2018-X51 -- 2018 XR, 2018 XO, 2018 XN
587Sormano Obs. in Italy, 2 in MPECs 2018-X45 & 2018-X46 -- 2018 XN, 2009 XV1
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2018-X48 -- 2007 WF55, 2003 NW1
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2018-X48 -- 2018 VG3, 2014 AY28, 354182
I52Steward Obs. Mt. Lemmon Station in Arizona, 6 in MPECs 2018-X45, 2018-X46, 2018-X47, 2018-X48 & 2018-X51 -- 2018 XR, 2018 XO, 2018 XN, 2018 XD, 2018 WP2, 2009 XV1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-X48 -- 2018 XA
L01Visnjan Obs., 5 in MPECs 2018-X45, 2018-X46, 2018-X47, 2018-X48 & 2018-X51 -- 2018 XR, 2018 XO, 2018 XN, 2018 WJ, 2009 XV1
C51WISE in Earth polar orbit, 4 in MPEC 2018-X48 -- 2007 NL1, 329395, 194268, 162741
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 December '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 XAJPL Sentry17002099-209925.343e-07-5.70-5.870JPL: Computed at 07:49 today Pacific time based on 86 observations spanning 4.1713 days (2018-Dec-01.34686 to 2018-Dec-05.518193). Diameter approximately 0.067 km. from weighted mean H=23.51.
2018 WJJPL Sentry17002045-207241.19994e-06-6.80-7.160JPL: Computed at 07:39 today Pacific time based on 81 observations spanning 2.6420 days (2018-Nov-17.26735 to 2018-Nov-19.909366). Diameter approximately 0.010 km. from weighted mean H=27.65.
2016 JT38JPL Sentry17002103-210311.370e-07-4.61-4.610JPL: Computed at 07:29 today Pacific time based on 18 observations spanning 8.9923 days (2016-Apr-26.3141 to 2016-May-05.30645). Diameter approximately 0.320 km. from weighted mean H=20.13.

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 6 December '18

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

2236Grabbed MPEC 2018-X51 - 2018 XR - see above
2010Generated Traffic Report
1900Grabbed MPEC 2018-X50 - 2013 BT18 - see above
1703Grabbed MPEC 2018-X49 - Comet P/2005 GF8 = 2018 X1 (LONEOS) - see above
1700Noted that JPL Sentry has updated its 2016 JT38 risk assessment - see above
Noted that JPL Sentry has updated its 2018 WJ risk assessment - see above
Noted that JPL Sentry has updated its 2018 XA risk assessment - see above
Grabbed MPEC 2018-X48 - Daily Orbit Update - see above
Noted Radar Astrometry database update - see above
0408Grabbed MPEC 2018-X45 - 2009 XV1 - see above
Grabbed MPEC 2018-X46 - 2018 XN - see above
Grabbed MPEC 2018-X47 - 2018 XO - see above