Contents  on 21 February '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 21 February '18

Eight objects reported inside ten LD

There are eight asteroidal objects reported to be less than ten lunar distances (LD) from our planet today. Closest is risk-listed 2018 DB, which exits Earth's sphere of gravitational influence as it moves away from 2.30 to 4.68 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
0.92 LD Feb. 15 2018 CD3 6 m  8.72 to 10.39 LD Feb. 9 - 21 intruder, NHATS target, exits ten LD
2.25 LD yesterday 2018 DB 10 m  2.30 to 4.68 LD Feb. 18 - 23 exits Earth SOI, risk
3.7   LD Feb. 24* 2017 DR109 10 m  5.2 from 6.5 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
5.18 LD Feb. 24 2018 CE14 26 m  7.99 from 9.85 LD yesterday - Feb. 28 NHATS target - DOU
5.43 LD Feb. 27 2018 CU14 10 m  7.65 from 8.38 LD Feb. 18 - March 8 NHATS target - DOU
6.08 LD Feb. 19 2018 CP2 48 m  6.83 to 8.29 LD Feb. 16 - 22
6.66 LD Jan. 15 2018 AV2 6 m  8.72 to 8.84 LD Nov. 10 - March 2 NHATS target, natural?
9.26 LD yesterday 2018 CJ 64 m  9.56 to 10.93 LD Feb. 19 - 21 exits ten LD

This report was generated at 1921 UTC with first follow-up in today's DOU MPEC for inbound objects 2018 CU14 and 2018 CE14 along with continuing follow-up for approaching 2017 VR12 and departed objects 2018 CH and 2018 BQ, plus astrometry from January for distant 2014 EY24.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
3.76 LD March 7 2017 VR12 273 m  19.06 from 20.42 LD Feb. 28 - March 13 radar/NHATS target - DOU
9.3   LD March 3* 2018 DC 40 m  20.2 from 21.9 LD March 1 - 5 EPU +/- 32 mins.*, NHATS target
6.9   LD March 10* 2015 DK200 26 m  30.4 from 32.2 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
* EPU = Earth passage uncertainty



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 approached Earth within ten LD since A/CC began these traffic reports eleven years ago but is not currently coming so close. 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 21 February '18

The MPC's NEO Confirmation Page has 21 listings

When last checked at 1931 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 21 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 25 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 21 February '18

Minor Planet Electronic Circulars

As of last check at 1931 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 21 Feb. '18 >>  MPEC 2018-D36 - "13:04 UT" - Daily Orbit Update


MPEC 2018-D35 - "12:00 UT" - 2017 FE90


MPEC 2018-D34 - "11:58 UT" - 2016 CO247


MPEC 2018-D33 - "11:50 UT" - 2018 DJ

Observers  on 21 February '18

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 4 in MPEC 2018-D36 -- 276033, 162882, 12711, 3122
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2018-D36 -- 2018 CH, 2018 BS, 2018 AX, 2018 AP18, 2018 AF12, 2018 AB12, 2017 YD8, 2017 XL2, 2017 VK2, 2014 VL6, 2014 EY24, 2014 AR46, 2008 CA5
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2018-D36 -- 2017 SR32, 2007 LU19
703Catalina Sky Survey in Arizona, 1 in MPEC 2018-D36 -- 53110
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPEC 2018-D36 -- 2018 CC14, 2018 CB14, 2018 CA14, 2018 BZ2, 2018 BQ, 2018 AX3, 2018 AL18, 2017 YL6
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-D36 -- 2018 CE14
B15Inastars Obs. in Germany, 1 in MPEC 2018-D33 -- 2018 DJ
Z43Landehen Obs., 1 in MPEC 2018-D36 -- 2017 VR12
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2018-D36 -- 323179, 140039, 8567
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2018-D36 -- 142348
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2018-D36 -- 162882
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2018-D33 & 2018-D36 -- 2018 DJ, 2018 CH14, 2003 UO12, 508861, 276033, 257744, 190208
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2018-D33 -- 2018 DJ
C48Sayn Solar Obs. in Russia, 1 in MPEC 2018-D36 -- 7977
033Schwarzschild Obs. in Germany, 6 in MPECs 2018-D33 & 2018-D36 -- 2018 DJ, 2018 DG, 2018 CU14, 2018 CE14, 2017 SO17, 2017 RY15
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2018-D33 & 2018-D36 -- 2018 DJ, 2016 SA, 2010 LM14
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2018-D35 & 2018-D36 -- 2018 AE3, 2017 FE90
T09UH/Tholen NEO Follow-Up Subaru Telescope in Hawaii, 1 in MPEC 2018-D34 -- 2016 CO247
C51WISE in Earth polar orbit, 1 in MPEC 2018-D36 -- 2010 GZ60
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 February '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 1931 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
2018 AB12NEODyS1740210313.68e-09-8.51-8.510NEODyS: "Based on 68 optical observations (of which 0 are rejected as outliers) from 2018-01-14.378 to 2018-02-13.384."

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 21 February '18

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

1921Generated Traffic Report
1740Noted that NEODyS has updated its 2018 AB12 risk assessment - see above
Grabbed MPEC 2018-D33 - 2018 DJ - see above
Grabbed MPEC 2018-D34 - 2016 CO247 - see above
Grabbed MPEC 2018-D35 - 2017 FE90 - see above
Grabbed MPEC 2018-D36 - Daily Orbit Update - see above