Contents  on 3 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 3 December '18

Ten objects reported inside ten LD

There are ten asteroids reported to be less than ten lunar distances (LD) from Earth today. The closest is risk-listed intruder 2018 WV1, which leaves the Earth-Moon system as it cruises outward from 0.57 to 1.07 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 yesterday 2018 WV1 3 m  0.57 to 1.07 LD Nov. 8 - Dec. 25 intruder today, NHATS target, inside Earth SOI, risk - DOU
0.52 LD Nov. 30 2018 WG2 3 m  3.28 to 4.73 LD Nov. 23 - Dec. 7 intruder, NHATS target, risk
1.18 LD Nov. 25 2018 WH1 7 m  6.59 to 7.48 LD Nov. 15 - Dec. 6 Moon buzzer, NHATS target, risk - DOU
2.62 LD Dec. 15 2018 VO9 14 m  7.60 from 8.17 LD Nov. 29 - Dec. 31 NHATS target, risk - DOU
2.76 LD Dec. 1 2018 WF2 7 m  4.71 to 6.95 LD Nov. 27 - Dec. 5
3.42 LD tomorrow 2018 WD2 21 m  3.74 from 4.69 LD Nov. 29 - Dec. 10 DOU
3.92 LD yesterday 2018 TG6 12 m  3.92 to 3.94 LD Oct. 30 - Jan. 5 NHATS target
4.1   LD Dec. 9* 2013 VX4 62 m  9.4 from 10.7 LD today - Dec. 15 EPU +/- 2.35 days*, enters ten LD
4.82 LD Dec. 7 2018 WX1 55 m  8.36 from 10.09 LD today - Dec. 11 NHATS target, enters ten LD
8.21 LD Nov. 25 2018 VT7 9 m  8.99 to 9.20 LD Nov. 15 - Dec. 7 NHATS target
* EPU = Earth passage uncertainty

This report was generated at 2012 UTC with follow-up in today's DOU MPEC for inbound 2018 WD2 and departed 2008 WD14 along with five risk-listed objects: inbound 2018 VO9, outbound objects 2018 WH1 and intruder 2018 WV1, and departed 2018 XA and intruder 2018 WE1.

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  21.00 from 24.03 LD Dec. 8 - 12
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  25.72 from 26.98 LD Dec. 17 - 26 radar/NHATS target
7.3   LD Jan. 9* 2013 YM2 19 m  35.9 from 36.8 LD Jan. 2 - 16 EPU +/- 1.25 days*, NHATS target


<< Reading:  NASA/Goddard reports that the OSIRIS-REx spacecraft has finished approaching its target, risk-listed 101955 Bennu (1999 RQ36).



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.

NEOCP Activity  on 3 December '18

The MPC's NEO Confirmation Page has 43 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 43 objects listed. Of these, 27 were "one nighters." So far The Tracking News has counted a total of 47 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 3 December '18

Minor Planet Electronic Circulars

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


<< DOU on 3 Dec. '18 >>  MPEC 2018-X24 - "13:05 UT" - Daily Orbit Update


MPEC 2018-X23 - "03:52 UT" - Comet C/2018 W2 (Africano)

Observers  on 3 December '18

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 10 in MPEC 2018-X24 -- 2018 XA, 2018 WD2, 2018 VX6, 2018 VN3, 2018 TS, 2018 TC3, 2018 RL, 2015 WY1, 2010 GT7, 523811
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2018-X24 -- 2009 SV17, 2008 WD14
160Castelmartini Obs. in Italy, 20 in MPEC 2018-X24 -- 96315, 523811, 523604, 518735, 457260, 454100, 442742, 424482, 18736, 16834, 162004, 159495, 141498, 141079, 140928, 138852, 137084, 3691, 3200, 2061
703Catalina Sky Survey in Arizona, 1 in MPEC 2018-X23 -- C/2018 W2
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPEC 2018-X24 -- 2018 VF4, 2018 TR2, 2018 RW7, 2018 RB8, 2018 PX19, 2018 NS1, 2018 LZ5, 2018 LR15, 2018 KV
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-X23 -- C/2018 W2
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 8 in MPEC 2018-X24 -- 2018 XA, 2018 WV1, 2018 WP2, 2018 WP, 2018 WO2, 2018 WE1, 2018 VO9, 2001 WF49
157Frasso Sabino Obs. in Italy, 1 in MPEC 2018-X23 -- C/2018 W2
K73Gravina Obs. in Italy, 1 in MPEC 2018-X24 -- 433
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-X23 -- C/2018 W2
C94MASTER-II Tunka in Russia, 1 in MPEC 2018-X24 -- 3552
474Mt. John Obs. in New Zealand, 2 in MPEC 2018-X24 -- 2018 VG10, 2018 KV
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2018-X23 -- C/2018 W2
C95SATINO-1 in France, 1 in MPEC 2018-X24 -- 2011 AA37
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-X23 -- C/2018 W2
L06Sormano2 Obs. in Italy, 1 in MPEC 2018-X23 -- C/2018 W2
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-X24 -- 2018 WH1
W34Squirrel Valley Obs. in North Carolina, 3 in MPEC 2018-X24 -- 2018 XA, 457260, 217796
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-X24 -- 2018 SR2
L01Visnjan Obs., 1 in MPEC 2018-X23 -- C/2018 W2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 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 Sentry17302099-209929.975e-07-5.40-5.560JPL: Computed at 06:58 today Pacific time based on 43 observations spanning 2.0948 days (2018-Dec-01.34686 to 2018-Dec-03.44167). Diameter approximately 0.069 km. from weighted mean H=23.46.
2018 WV1JPL Sentry2003R E M O V E DJPL #2 for the day: Risk listing removed at 1936 UTC today
2018 WH1JPL Sentry17302076-2112171.201502e-05-7.02-7.900JPL: Computed at 07:11 today Pacific time based on 55 observations spanning 5.9656 days (2018-Nov-27.25828 to 2018-Dec-03.22386). Diameter approximately 0.007 km. from weighted mean H=28.45.
2018 WE1JPL Sentry17302063-207441.2971e-06-6.34-6.670JPL: Computed at 07:04 today Pacific time based on 56 observations spanning 6.4622 days (2018-Nov-26.46885 to 2018-Dec-02.931009). Diameter approximately 0.022 km. from weighted mean H=25.94.
2018 WPNEODyS1730R E M O V E D-
2018 VO9JPL Sentry17302102-211087.693565e-05-5.56-5.840JPL: Computed at 07:02 today Pacific time based on 26 observations spanning 23.598 days (2018-Nov-09.26967 to 2018-Dec-02.867348). Diameter approximately 0.014 km. from weighted mean H=26.99.

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 3 December '18

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

2012Generated Traffic Report
2003Noted that JPL Sentry has removed 2018 WV1 as an impact risk - see above
1730Noted that JPL Sentry has updated its 2018 VO9 risk assessment - see above
Noted that JPL Sentry has updated its 2018 WE1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 WH1 risk assessment - see above
Noted that NEODyS has removed 2018 WP as an impact risk - see above
Noted that JPL Sentry has updated its 2018 WV1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 XA risk assessment - see above
Grabbed MPEC 2018-X24 - Daily Orbit Update - see above
0520Grabbed MPEC 2018-X23 - Comet C/2018 W2 (Africano) - see above