Contents  on 6 March '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 March '18

Nine objects reported inside ten LD

Nine asteroidal objects are reported inside ten lunar distances (LD) of Earth today. Nearest are 2018 DC4, outbound from 3.48 to 3.83 LD, and 2017 VR12, inbound from 4.20 to 3.79 LD. Much further away, 2015 DK200 is calculated to enter our ten-LD traffic reporting "bubble," but with an Earth passage uncertainty of plus-or-minus a day.

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
0.29 LD March 2 2018 DV1 7 m  5.15 to 6.51 LD Feb. 22 - March 9 intruder, NHATS target
0.74 LD Feb. 25 2018 DU 8 m  8.10 to 9.07 LD Feb. 15 - tomorrow intruder, NHATS target
3.32 LD March 4 2018 DC4 11 m  3.48 to 3.83 LD Feb. 22 - March 15 NHATS target
3.76 LD tomorrow 2017 VR12 257 m  3.79 from 4.20 LD Feb. 28 - March 13 radar/NHATS target - DOU
4.18 LD Feb. 27 2018 DT 13 m  5.77 to 6.18 LD Feb. 11 - March 15 NHATS target - DOU
5.09 LD March 2 2018 DU1 9 m  7.10 to 8.15 LD Feb. 24 - March 8 NHATS target, risk
5.28 LD March 11 2018 DY3 20 m  9.09 from 10.61 LD today - March 15 NHATS target, enters ten LD - DOU
5.44 LD Feb. 27 2018 CU14 10 m  8.40 to 9.17 LD Feb. 19 - March 8 NHATS target
6.9   LD March 10* 2015 DK200 26 m  9.0 from 10.3 LD today - March 14 EPU +/- 23.45 hours*, NHATS target, enters ten LD

This report was generated at 1922 UTC with first follow-up for inbound 2018 DY3 in today's DOU MPEC along with continuing follow-up for departed 2018 BQ, outbound 2018 DT, approaching 2018 DH1, and inbound 2017 VR12, for which there is also first radar follow-up.

Approaching Traffic
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.2   LD March 27* 2018 DH1 214 m  69.4 from 73.0 LD March 26 - 28 EPU +/- 25 mins.* - DOU
* 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. 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 March '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 0025 UTC when the database was dated 5 March

NEOCP Activity  on 6 March '18

The MPC's NEO Confirmation Page has 29 listings

When last checked at 2342 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 29 objects listed. Of these, 20 were "one nighters." So far The Tracking News has counted a total of 30 listings on the NEOCP today.

New MPECs  on 6 March '18

Minor Planet Electronic Circulars

As of last check at 2342 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 6 Mar. '18 >>  MPEC 2018-E20 - "13:02 UT" - Daily Orbit Update

Observers  on 6 March '18

A total of 23 observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2018-E20 -- 2018 AG
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2018-E20 -- 2012 DG61, 88213, 509520, 27346, 237805, 3122, 1981, 1864
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 17 in MPEC 2018-E20 -- 2018 DT1, 2018 DL, 2018 DH1, 2018 DE2, 2018 DA2, 2018 CZ13, 2018 CY13, 2018 CP3, 2018 CH14, 2018 CD14, 2018 BQ, 2018 BP5, 2018 BO3, 2018 BK3, 2018 AP12, 2017 YA6, 2017 TV4
K88GINOP-KHK in Hungary, 1 in MPEC 2018-E20 -- 2018 DD4
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2017 VR12
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 4 in MPEC 2018-E20 -- 2018 AB12, 2017 RL, 2013 AW60, 2011 WN15
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2018-E20 -- 234145
K28MPC code K28, 1 in MPEC 2018-E20 -- 2017 VR12
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPEC 2018-E20 -- 2017 SO17, 455594, 228587, 185853, 137062, 1580
566NEAT's GEODSS Haleakala telescope in Hawaii, 1 in MPEC 2018-E20 -- 96315
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2018-E20 -- 138013
608NEAT's USAF Haleakala telescope in Hawaii, 2 in MPEC 2018-E20 -- 96315, 138013
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPEC 2018-E20 -- 2018 DK3, 2018 DJ, 2017 XV2, 2016 CJ195, 509569, 496816, 463360, 435404, 385497, 212546, 163692, 152680, 142348
D29Purple Mtn. Obs. Xuyi Station in China, 8 in MPEC 2018-E20 -- 509520, 322763, 185853, 162011, 152931, 7977, 6053, 1866
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-E20 -- 2018 CU1
Y00SONEAR in Brazil, 1 in MPEC 2018-E20 -- 3552
Q21Southern Utsunomiya in Japan, 1 in MPEC 2018-E20 -- 2018 BL1
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2018-E20 -- 2018 DX1, 2018 CY, 2018 BQ, 2015 DP155, 1999 FN19, 267940
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2018-E20 -- 2018 DY1, 2017 UY4, 2002 JW15
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-E20 -- 2018 DH1
I52Steward Obs. Mt. Lemmon Station in Arizona, 31 in MPEC 2018-E20 -- 2018 DZ1, 2018 DY3, 2018 DY1, 2018 DX3, 2018 DX1, 2018 DT1, 2018 DT, 2018 DK1, 2018 DJ, 2018 DH1, 2018 DG1, 2018 DD4, 2018 DB2, 2018 DB1, 2018 DA4, 2018 DA2, 2018 CZ13, 2018 CY, 2018 CU1, 2018 CT2, 2018 CP3, 2018 CP14, 2018 CG2, 2018 CE2, 2018 CE1, 2018 BO3, 2018 BB7, 2018 BA7, 2017 XQ2, 2015 FQ117, 137062
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-E20 -- 2017 YT4, 192559
C51WISE in Earth polar orbit, 2 in MPEC 2018-E20 -- 508997, 496837
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 March '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2342 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 DY1JPL Sentry1714R E M O V E DJPL: Risk listing removed at 1552 UTC today
2018 AB12NEODyS1714R E M O V E D-
2016 NL56JPL Sentry08372023-21182597.179225e-07-3.65-4.470JPL: Computed at 20:13 March 5th Pacific time based on 6 observations spanning 2.7820 days (2016-Jul-12.443828 to 2016-Jul-15.225848). Diameter approximately 0.265 km. from weighted mean H=20.61.

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 March '18

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

1922Generated Traffic Report
1714Noted that NEODyS has removed 2018 AB12 as an impact risk - see above
Noted that JPL Sentry has removed 2018 DY1 as an impact risk - see above
Grabbed MPEC 2018-E20 - Daily Orbit Update - see above
0837Noted that JPL Sentry has updated its 2016 NL56 risk assessment - see above
0025Noted Radar Astrometry database update - see above