Contents  on 14 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 14 December '18

Seven objects reported inside ten LD

Seven asteroids are reported traveling within ten lunar distances (LD) of Earth today. The closest is risk-listed 2018 VO9, which moves inward from 2.78 to 2.64 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  5.25 to 5.65 LD Nov. 8 - Dec. 25 intruder, NHATS target
1.25 LD Dec. 10 2018 XX3 4 m  3.50 to 4.46 LD Nov. 30 - Dec. 20 NEW, risk - MPEC
2.42 LD Dec. 12 2018 XL1 14 m  3.41 to 4.49 LD Dec. 5 - 19 NHATS target
2.62 LD tomorrow 2018 VO9 14 m  2.64 from 2.78 LD Nov. 29 - Dec. 31 NHATS target, risk
3.92 LD Dec. 2 2018 TG6 12 m  5.03 to 5.21 LD Oct. 30 - Jan. 5 NHATS target
4.1   LD Dec. 9* 2013 VX4 62 m  7.6 to 8.8 LD Dec. 3 - 15 EPU +/- 7.06 days*
5.58 LD yesterday 2018 XJ1 18 m  5.68 to 6.11 LD Dec. 7 - 19
* EPU = Earth passage uncertainty

This report was generated at 1840 UTC with the discoveries of outbound risk-listed 2018 XX3 (MPEC) and already departed risk-listed 2018 XW3 (MPEC), which got by us at about 5.5 LD on December 9th.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  12.26 from 13.38 LD Dec. 17 - 26 radar/NHATS target
7.3   LD Jan. 9* 2013 YM2 19 m  25.7 from 26.6 LD Jan. 2 - 16 EPU +/- 3.75 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 14 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 2358 UTC when the database was dated 14 Dec.



Photometry and some astrometry is needed for upcoming radar targets. See Arecibo and Goldstone schedules.

NEOCP Activity  on 14 December '18

The MPC's NEO Confirmation Page has 71 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 71 objects listed. Of these, 34 were "one nighters." So far The Tracking News has counted a total of 86 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 14 December '18

Minor Planet Electronic Circulars

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


MPEC 2018-X115 - "16:37 UT" - 2018 XQ3


MPEC 2018-X114 - "15:40 UT" - 2018 XX3


MPEC 2018-X113 - "15:36 UT" - 2018 XW3


MPEC 2018-X112 - "15:32 UT" - 2018 XV3


MPEC 2018-X111 - "15:28 UT" - 2018 XU3


MPEC 2018-X110 - "15:24 UT" - 2018 XT3


MPEC 2018-X109 - "15:19 UT" - 2018 XR3


MPEC 2018-X108 - "15:14 UT" - 2018 XP3


<< DOU on 14 Dec. '18 >>  MPEC 2018-X107 - "13:05 UT" - Daily Orbit Update

Observers  on 14 December '18

Thirteen observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 46P
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2018-X109 & 2018-X112 -- 2018 XV3, 2018 XR3
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2018-X107 -- 2018 XB2, 2018 VB9
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2018-X107 -- 2018 QN1, 2010 GT7, 2009 XV1, 2003 NW1
703Catalina Sky Survey in Arizona, 1 in MPEC 2018-X107 -- 523824
734Farpoint Obs. in Kansas, 1 in MPEC 2018-X108 -- 2018 XP3
J95Great Shefford Obs. in England, 3 in MPECs 2018-X112, 2018-X113 & 2018-X114 -- 2018 XX3, 2018 XW3, 2018 XV3
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2018-X108, 2018-X109, 2018-X110, 2018-X111, 2018-X112 & 2018-X115 -- 2018 XV3, 2018 XU3, 2018 XT3, 2018 XR3, 2018 XQ3, 2018 XP3
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2018-X108, 2018-X109, 2018-X110, 2018-X111, 2018-X113, 2018-X114 & 2018-X115 -- 2018 XX3, 2018 XW3, 2018 XU3, 2018 XT3, 2018 XR3, 2018 XQ3, 2018 XP3
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPECs 2018-X107 & 2018-X112 -- 2018 XV3, 2018 XN, 2018 WU1, 2018 WP, 2018 TS, 2018 PE22, 2015 YU7, 2015 ME54, 2014 XR6, 1998 YF10, 267221, 162004
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-X108 -- 2018 XP3
I52Steward Obs. Mt. Lemmon Station in Arizona, 10 in MPECs 2018-X107, 2018-X108, 2018-X109, 2018-X110, 2018-X111, 2018-X112, 2018-X113, 2018-X114 & 2018-X115 -- 2018 XX3, 2018 XW3, 2018 XV3, 2018 XU3, 2018 XT3, 2018 XR3, 2018 XQ3, 2018 XP3, 2018 WM2, 1998 YF10
L01Visnjan Obs., 6 in MPECs 2018-X108, 2018-X109, 2018-X110, 2018-X111, 2018-X112 & 2018-X115 -- 2018 XV3, 2018 XU3, 2018 XT3, 2018 XR3, 2018 XQ3, 2018 XP3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 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 XX3JPL Sentry17302088-211841.828773e-06-8.37-8.570JPL: Computed at 09:06 today Pacific time based on 20 observations spanning 1.0087 days (2018-Dec-13.30812 to 2018-Dec-14.31686). Diameter approximately 0.004 km. from weighted mean H=29.64.
NEODyS17302086-211271.18e-06-8.55-8.620NEODyS: "Based on 21 optical observations (of which 1 are rejected as outliers) from 2018-12-13.309 to 2018-12-14.318."
2018 XW3JPL Sentry17302030-209643.7653e-07-6.76-6.880JPL: Computed at 09:01 today Pacific time based on 17 observations spanning 1.0291 days (2018-Dec-13.2296 to 2018-Dec-14.25868). Diameter approximately 0.019 km. from weighted mean H=26.29.
NEODyS17302030-204469.92e-07-6.15-6.350NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2018-12-13.230 to 2018-12-14.259."
2018 XG3NEODyS1730211111.66e-07-7.74-7.740NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2018-12-10.333 to 2018-12-12.871."
2018 XX2NEODyS17302088-211793.67e-07-7.13-7.490NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2018-12-10.539 to 2018-12-12.395."
2018 XQ2NEODyS17302053-21182167.41e-04-4.86-5.09-NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2018-12-10.243 to 2018-12-13.360."
2018 XF2NEODyS17302091-210434.04e-07-7.27-7.310NEODyS: "Based on 60 optical observations (of which 2 are rejected as outliers) from 2018-12-10.269 to 2018-12-13.324."
2018 XANEODyS1730209921.45e-08-7.33-7.510NEODyS: "Based on 116 optical observations (of which 0 are rejected as outliers) from 2018-12-01.348 to 2018-12-12.282."
2018 WA3NEODyS17302055-206021.09e-05-6.07-6.080NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2018-11-29.262 to 2018-12-08.433."
2018 WH1NEODyS17302067-2117272.88e-05-6.59-7.380NEODyS: "Based on 62 optical observations (of which 1 are rejected as outliers) from 2018-11-27.259 to 2018-12-09.276."
2018 WE1NEODyS17302063-2096123.1e-06-6.00-6.320NEODyS: "Based on 78 optical observations (of which 2 are rejected as outliers) from 2018-11-26.470 to 2018-12-09.482."
2018 VO9NEODyS17302106-211759.93e-07-7.40-7.650NEODyS: "Based on 44 optical observations (of which 0 are rejected as outliers) from 2018-11-09.270 to 2018-12-10.083."
2005 TM173JPL Sentry17302018-21161529.454221e-07-5.38-6.270JPL: Computed at 08:06 April 8th of 2017 Pacific time based on 6 observations spanning 1.9467 days (2005-Oct-09.20072 to 2005-Oct-11.14743). Diameter approximately 0.051 km. from weighted mean H=24.12.
NEODyS17302018-2112924.22e-07-5.87-6.670NEODyS: "Based on 6 optical observations (of which 0 are rejected as outliers) from 2005-10-09.201 to 2005-10-11.148."

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 14 December '18

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

2358Noted Radar Astrometry database update - see above
1840Generated Traffic Report
1730Noted that JPL Sentry has updated its 2005 TM173 risk assessment - see above
Noted that NEODyS has updated its 2005 TM173 risk assessment - see above
Noted that NEODyS has updated its 2018 VO9 risk assessment - see above
Noted that NEODyS has updated its 2018 WA3 risk assessment - see above
Noted that NEODyS has updated its 2018 WE1 risk assessment - see above
Noted that NEODyS has updated its 2018 WH1 risk assessment - see above
Noted that NEODyS has updated its 2018 XA risk assessment - see above
Noted that NEODyS has posted 2018 XF2 as an impact risk - see above
Noted that NEODyS has posted 2018 XG3 as an impact risk - see above
Noted that NEODyS has posted 2018 XQ2 as an impact risk - see above
Noted that JPL Sentry has posted 2018 XW3 as an impact risk - see above
Noted that NEODyS has posted 2018 XW3 as an impact risk - see above
Noted that NEODyS has posted 2018 XX2 as an impact risk - see above
Noted that JPL Sentry has posted 2018 XX3 as an impact risk - see above
Noted that NEODyS has posted 2018 XX3 as an impact risk - see above
Grabbed MPEC 2018-X107 - Daily Orbit Update - see above
Grabbed MPEC 2018-X108 - 2018 XP3 - see above
Grabbed MPEC 2018-X109 - 2018 XR3 - see above
Grabbed MPEC 2018-X110 - 2018 XT3 - see above
Grabbed MPEC 2018-X111 - 2018 XU3 - see above
Grabbed MPEC 2018-X112 - 2018 XV3 - see above
Grabbed MPEC 2018-X113 - 2018 XW3 - see above
Grabbed MPEC 2018-X114 - 2018 XX3 - see above
Grabbed MPEC 2018-X115 - 2018 XQ3 - see above