Contents  on 23 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 23 February '18

Eight objects reported inside ten LD

Eight asteroids are known to be less than ten lunar distances (LD) from our home world today. Closest is newly announced 2018 DR, which moves in from 4.00 to 2.86 LD, while 2017 DR109 is calculated from last year's observations to be inbound from 4.2 to 3.7 LD*, but with an uncertainty of plus-or-minus 30 minutes in this year's Earth passage.

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
0.26 LD Feb. 21 2018 DQ 5 m  6.99 to 11.68 LD Feb. 19 - 23 NEW, intruder, exits ten LD, risk - MPEC
2.25 LD Feb. 20 2018 DB 10 m  8.06 to 11.59 LD Feb. 18 - 23 exits ten LD, risk
2.29 LD Feb. 25 2018 DR 12 m  2.86 from 4.00 LD Feb. 18 - March 3 NEW - MPEC
3.7   LD tomorrow* 2017 DR109 10 m  3.7 from 4.2 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
4.2   LD Feb. 27* 2018 DT 13 m  4.6 from 4.8 LD Feb. 11 - March 15 NEW, EPU +/- 14 mins.* - MPEC
5.18 LD tomorrow 2018 CE14 26 m  5.39 from 6.42 LD Feb. 20 - 28 NHATS target - DOU
5.44 LD Feb. 27 2018 CU14 10 m  6.41 from 6.99 LD Feb. 19 - March 8 NHATS target - DOU
6.66 LD Jan. 15 2018 AV2 6 m  8.96 to 9.08 LD Nov. 10 - March 2 NHATS target, natural? - DOU

This report was updated at 2330 UTC with three more discoveries of nearby objects: 2018 DT (MPEC), 2018 DR (MPEC), and 2018 DQ (MPEC). Your first local flying rocks traffic report was generated at 1940 UTC with the recovery of distant 2017 DC36 (MPEC) and the discoveries of departed objects 2018 DN (MPEC), which went by at 6.36 LD on February 15th, and 2018 AU18 (MPEC), which passed us at 1.87 LD late on January 10th and buzzed the Moon at 0.93 LD early the next day. Today's DOU MPEC has follow-up for six objects, five of them in our active traffic tables (above and below) and all of them NHATS targets: approaching 2018 DC and 2017 VR12, inbound 2018 CU14 and 2018 CE14, outbound 2018 AV2, and departed 2018 BQ.

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 269 m  16.35 from 17.71 LD Feb. 28 - March 13 radar/NHATS target - DOU
9.27 LD March 3 2018 DC 38 m  16.98 from 18.57 LD March 1 - 5 NHATS target - DOU
6.9   LD March 10* 2015 DK200 26 m  26.7 from 28.5 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. 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 23 February '18

The MPC's NEO Confirmation Page has 52 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 52 objects listed. Of these, 36 were "one nighters." So far The Tracking News has counted a total of 60 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 23 February '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-D49 - "21:22 UT" - 2018 DT


MPEC 2018-D48 - "21:19 UT" - 2018 DS


MPEC 2018-D47 - "21:15 UT" - 2018 DR


MPEC 2018-D46 - "21:12 UT" - 2018 DP


MPEC 2018-D45 - "21:07 UT" - 2018 DQ


<< DOU on 23 Feb. '18 >>  MPEC 2018-D44 - "13:06 UT" - Daily Orbit Update


MPEC 2018-D43 - "12:27 UT" - 2017 DC36


MPEC 2018-D42 - "02:16 UT" - 2018 AU18


MPEC 2018-D41 - "02:13 UT" - 2018 DN

Observers  on 23 February '18

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 11 in MPECs 2018-D44 & 2018-D48 -- 2018 DS, 2018 CU1, 2018 CP14, 509935, 505667, 311554, 276033, 190208, 162011, 7977, 6053
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2018-D44 -- 2018 DM
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2018-D44, 2018-D47, 2018-D48 & 2018-D49 -- 2018 DT, 2018 DS, 2018 DR, 2018 CU1
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2018-D43, 2018-D44 & 2018-D46 -- 2018 DP, 2018 BV1, 2017 YW4, 2017 DC36
113Drebach Obs. in Germany, 1 in MPEC 2018-D49 -- 2018 DT
J95Great Shefford Obs. in England, 6 in MPECs 2018-D41, 2018-D44, 2018-D45, 2018-D47, 2018-D48 & 2018-D49 -- 2018 DT, 2018 DS, 2018 DR, 2018 DQ, 2018 DN, 2018 CE14
A17Guidestar Obs. in Germany, 9 in MPECs 2018-D44, 2018-D48 & 2018-D49 -- 2018 DT, 2018 DS, 2018 DG, 2018 CU1, 2018 CG2, 2018 BA7, 2016 CW31, 2015 FV118, 1999 SJ10
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 3 in MPECs 2018-D44 & 2018-D49 -- 2018 DT, 2018 CU1, 1981
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2018-D45, 2018-D47 & 2018-D48 -- 2018 DS, 2018 DR, 2018 DQ
G96Mt. Lemmon Survey (MLS) in Arizona, 14 in MPECs 2018-D42, 2018-D44, 2018-D45 & 2018-D46 -- 2018 DQ, 2018 DP, 2018 AU18, 2018 AG2, 2017 VH2, 2013 AA2, 2011 EC7, 1999 FN19, 457059, 456898, 358744, 232691, 144861, 8709
K74Muensterschwarzach Obs. in Germany, 2 in MPECs 2018-D44 & 2018-D49 -- 2018 DT, 2018 CZ2
644NEAT's Mt. Palomar telescope in southern California, 3 in MPEC 2018-D44 -- 323179, 276033, 11066
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2018-D44 -- 8037
J69North Obs. in England, 1 in MPEC 2018-D44 -- 2017 VR12
Z80Northolt Branch Obs. in England, 4 in MPEC 2018-D44 -- 2018 DA, 2018 CU1, 2017 VR12, 3752
J43Oukaimeden Obs. in Morocco, 3 in MPEC 2018-D44 -- 162038, 154652, 3102
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2018-D41 & 2018-D46 -- 2018 DP, 2018 DN
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2018-D49 -- 2018 DT
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2018-D44 -- 443103
C95SATINO-1 in France, 1 in MPEC 2018-D48 -- 2018 DS
033Schwarzschild Obs. in Germany, 4 in MPECs 2018-D41, 2018-D44, 2018-D46 & 2018-D48 -- 2018 DS, 2018 DP, 2018 DN, 2018 DA
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2018-D44 -- 2018 BP5, 2016 CW31
291Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2018-D44 & 2018-D46 -- 2018 DP, 2018 CZ2, 2018 CY, 2018 BQ, 2018 AV2, 2018 AJ12, 2018 AF4, 2017 YF7, 2017 VH2, 2017 SL33, 2014 WG365
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-D44 -- 162011, 1864
I52Steward Obs. Mt. Lemmon Station in Arizona, 36 in MPECs 2018-D43, 2018-D44, 2018-D45, 2018-D46, 2018-D47, 2018-D48 & 2018-D49 -- 2018 DT, 2018 DS, 2018 DR, 2018 DQ, 2018 DP, 2018 DL, 2018 DC, 2018 DA, 2018 CZ, 2018 CX13, 2018 CW13, 2018 CV1, 2018 CU14, 2018 CT2, 2018 CQ3, 2018 CP14, 2018 CO14, 2018 CK14, 2018 CH14, 2018 CG2, 2018 CE2, 2018 CA14, 2018 CA, 2018 BV, 2018 BS1, 2018 BP5, 2018 BO3, 2018 AO18, 2018 AJ12, 2018 AG2, 2017 YP4, 2017 YF7, 2017 YE5, 2017 SQ11, 2017 DC36, 2012 FN62
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2018-D48 -- 2018 DS
Z52The Studios Obs., 1 in MPEC 2018-D44 -- 137062
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-D44 -- 2014 GE35
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 February '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 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 DQJPL Sentry23262027-2114810.0001835397498-4.96-5.080JPL: Computed at 15:06 today Pacific time based on 17 observations spanning .77787 days (2018-Feb-22.45093 to 2018-Feb-23.2288). Diameter approximately 0.005 km. from weighted mean H=29.14.
2018 AU18JPL Sentry04212046-2104111.4390847e-06-7.02-7.220JPL: Computed at 19:53 Feb. 22nd Pacific time based on 15 observations spanning 4.9794 days (2018-Jan-15.37577 to 2018-Jan-20.35517). Diameter approximately 0.011 km. from weighted mean H=27.44.
2010 GZ60JPL Sentry1652R E M O V E DJPL: Risk listing removed at 1637 UTC today

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 23 February '18

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

2330Updated Traffic Report
2326Noted that JPL Sentry has posted 2018 DQ as an impact risk - see above
2236Grabbed MPEC 2018-D45 - 2018 DQ - see above
Grabbed MPEC 2018-D46 - 2018 DP - see above
Grabbed MPEC 2018-D47 - 2018 DR - see above
Grabbed MPEC 2018-D48 - 2018 DS - see above
Grabbed MPEC 2018-D49 - 2018 DT - see above
1652Noted that JPL Sentry has removed 2010 GZ60 as an impact risk - see above
Grabbed MPEC 2018-D43 - 2017 DC36 - see above
Grabbed MPEC 2018-D44 - Daily Orbit Update - see above
0421Noted that JPL Sentry has posted 2018 AU18 as an impact risk - see above
0305Grabbed MPEC 2018-D41 - 2018 DN - see above
Grabbed MPEC 2018-D42 - 2018 AU18 - see above