Contents  on 27 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 27 February '18

Ten objects reported inside ten LD

Ten transient natural objects are reported to be within ten lunar distances (LD) of our planet today. Nearest of these is intruder 2018 DU, which remains in Earth's sphere of gravitational influence as it moves away from 1.43 to 2.33 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
0.3   LD March 2* 2018 DV1 7 m  3.1 from 4.4 LD Feb. 22 - March 9 NEW, EPU +/- 29 mins.*, intruder, risk - MPEC
0.74 LD Feb. 25 2018 DU 8 m  1.43 to 2.33 LD Feb. 15 - March 7 intruder, NHATS target, inside Earth SOI
2.29 LD Feb. 25 2018 DR 11 m  3.76 to 5.09 LD Feb. 18 - March 3 NHATS target
3.7   LD Feb. 24* 2017 DR109 10 m  5.9 to 7.2 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.87 LD March 1 2018 DW1 15 m  4.75 from 6.72 LD Feb. 25 - March 4 NEW - MPEC
4.18 LD today 2018 DT 13 m  4.18 LD Feb. 11 - March 15 NHATS target, Earth closest at 0405 UTC
5.09 LD March 2 2018 DU1 9 m  6.18 from 7.08 LD Feb. 24 - March 8 NEW, risk - MPEC
5.18 LD Feb. 24 2018 CE14 26 m  7.45 to 9.24 LD Feb. 20 - 28 NHATS target
5.44 LD today 2018 CU14 10 m  5.44 LD Feb. 19 - March 8 NHATS target, Earth closest at 1056 UTC - DOU
6.66 LD Jan. 15 2018 AV2 6 m  9.47 to 9.60 LD Nov. 10 - March 2 NHATS target, natural? - DOU

This report was generated at 1920 UTC with the discoveries of five close passers, including three that are inbound and appear in the above active traffic table: 2018 DW1 (MPEC), risk-listed 2018 DU1 (MPEC), and intruder 2018 DV1 (MPEC), which is also risk listed. The other two have already departed: 2018 DD2 (MPEC) went past us at about 5.23 LD on February 17th and 2018 DC2 (MPEC) came by at 6.29 LD on the 20th. Today's DOU MPEC has follow-up for approaching objects 2018 DC and 2017 VR12, passing 2018 CU14, and distant objects 450894 2008 BT18 and 208023 1999 AQ10, plus astrometry from late January for outbound 2018 AV2 and departed risk-listed 2018 AT2 (3.53 days added to the 4.74-day observing arc).

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 272 m  10.99 from 12.32 LD tomorrow - March 13 radar/NHATS target - DOU
9.27 LD March 3 2018 DC 39 m  11.51 from 12.69 LD March 1 - 5 NHATS target - DOU
6.9   LD March 10* 2015 DK200 26 m  19.7 from 21.4 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
9.1   LD March 27* 2018 DH1 208 m  94.6 from 98.5 LD March 26 - 28 EPU +/- 8.45 hours*
* EPU = Earth passage uncertainty


Reading:  There has been some buzz on the Minor Planet Mailing List about a new science paper entitled, "Finding Long Lost Lexell's Comet: The Fate of the First Discovered Near-Earth Object." That's D/1770 L1 (Lexell).



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 objects that have approached Earth within ten LD since A/CC began these traffic reports in 2007 but are not presently 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 27 February '18

The MPC's NEO Confirmation Page has 45 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 45 objects listed. Of these, 22 were "one nighters." So far The Tracking News has counted a total of 64 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 27 February '18

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been eighteen MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-D88 - "17:16 UT" - P/2011 WG113 = 2017 U6 (Panstarrs)


MPEC 2018-D87 - "15:50 UT" - 2018 DF2


MPEC 2018-D86 - "15:46 UT" - 2018 DE2


MPEC 2018-D85 - "15:42 UT" - 2018 DC2


MPEC 2018-D84 - "15:33 UT" - 2018 DD2


MPEC 2018-D83 - "15:29 UT" - 2018 DB2


MPEC 2018-D82 - "15:18 UT" - 2018 DA2


MPEC 2018-D81 - "15:13 UT" - 2018 DZ1


MPEC 2018-D80 - "15:09 UT" - 2018 DY1


MPEC 2018-D79 - "15:05 UT" - 2018 DX1


MPEC 2018-D78 - "15:00 UT" - 2018 DW1


MPEC 2018-D77 - "14:51 UT" - 2018 DU1


MPEC 2018-D76 - "14:47 UT" - 2018 DT1


MPEC 2018-D75 - "14:43 UT" - 2018 DS1


MPEC 2018-D74 - "14:39 UT" - 2018 DV1


MPEC 2018-D73 - "14:35 UT" - 2018 DR1


<< DOU on 27 Feb. '18 >>  MPEC 2018-D72 - "13:05 UT" - Daily Orbit Update


MPEC 2018-D71 - "03:16 UT" - 2015 QL14

Observers  on 27 February '18

A total of 40 observers appear in today's MPECs.

CodeObserver / observatory
705$program code "$" (13) via Apache Point Obs. in New Mexico, 1 in MPEC 2018-D72 -- 2018 AV2
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2018-D72, 2018-D74 & 2018-D77 -- 2018 DV1, 2018 DU1, 2018 DB1, 2018 CG3, 2018 BZ6, 2018 BD6, 2015 TM178, 2013 LK25, 277039
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2018-D88 -- P/2017 U6
T08ATLAS Mauna Loa in Hawaii, 2 in MPECs 2018-D72 & 2018-D88 -- 2017 XB2, P/2017 U6
160Castelmartini Obs. in Italy, 1 in MPEC 2018-D88 -- P/2017 U6
703Catalina Sky Survey (CSS) in Arizona, 27 in MPECs 2018-D72, 2018-D76, 2018-D78 & 2018-D88 -- 2018 DW1, 2018 DT1, 2018 CZ2, 2018 CU1, P/2017 U6, 2017 SL33, 2016 CL32, 2010 FL, 85628, 511808, 511523, 509935, 505667, 496861, 450894, 443103, 40267, 38091, 265196, 25916, 172034, 163691, 154652, 142348, 12923, 8037, 1980
010!program code "!" (10) via Caussols Obs., 1 in MPEC 2018-D72 -- 2017 YN3
309'Martin Altmann in Germany via Cerro Paranal in Chile, 1 in MPEC 2018-D73 -- 2018 DR1
807.Scott Sheppard via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-D71 -- 2015 QL14
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 13 in MPECs 2018-D72, 2018-D80, 2018-D81, 2018-D82, 2018-D83 & 2018-D88 -- 2018 DZ1, 2018 DY1, 2018 DB2, 2018 DA2, 2018 CR2, 2018 CP3, 2018 CG14, 2018 CF14, 2018 AM12, 2018 AE2, 2017 TH6, 2017 QE18, P/2011 WG113
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-D76 -- 2018 DT1
K87Dettelbach Vineyard Obs. in Germany, 2 in MPEC 2018-D72 -- 2018 DG1, 2018 CX13
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2018-D88 -- P/2017 U6
K88GINOP-KHK in Hungary, 1 in MPEC 2018-D76 -- 2018 DT1
J95Great Shefford Obs. in England, 4 in MPECs 2018-D73, 2018-D77, 2018-D78 & 2018-D79 -- 2018 DX1, 2018 DW1, 2018 DU1, 2018 DR1
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2018-D72 -- 2018 CU1
H15ISON New Mexico Obs. in New Mexico, 2 in MPEC 2018-D72 -- 2017 VR12, 1036
Z43Landehen Obs., 2 in MPEC 2018-D72 -- 505657, 1981
304Las Campanas Obs. in Chile, 1 in MPEC 2018-D71 -- 2015 QL14
V37LCO Fort Davis in Texas, 1 in MPEC 2018-D72 -- 2018 CQ3
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2018-D77, 2018-D78, 2018-D79, 2018-D80 & 2018-D88 -- 2018 DY1, 2018 DX1, 2018 DW1, 2018 DU1, P/2017 U6
G96Mt. Lemmon Survey (MLS) in Arizona, 47 in MPECs 2018-D72, 2018-D73, 2018-D74, 2018-D75, 2018-D77, 2018-D78, 2018-D79, 2018-D80, 2018-D81, 2018-D82, 2018-D83, 2018-D84, 2018-D85, 2018-D86, 2018-D87 & 2018-D88 -- 2018 DZ1, 2018 DY1, 2018 DX1, 2018 DW1, 2018 DV1, 2018 DU1, 2018 DS1, 2018 DR1, 2018 DF2, 2018 DE2, 2018 DD2, 2018 DC2, 2018 DB2, 2018 DA2, 2018 CU1, 2018 CP3, 2017 WE2, 2017 UW42, P/2017 U6, 2014 RX30, 2013 QH10, 2010 FL, 2009 HB82, 86450, 509935, 508905, 505667, 496816, 465166, 450894, 422699, 411611, 368664, 31346, 248926, 214869, 208023, 162998, 152679, 143527, 137199, 136618, 9856, 8201, 7753, 4487, 1980
K74Muensterschwarzach Obs. in Germany, 3 in MPEC 2018-D72 -- 311554, 162882, 3752
644NEAT's Mt. Palomar telescope in southern California, 2 in MPEC 2018-D72 -- 85628, 15745
608NEAT's USAF Haleakala telescope in Hawaii, 4 in MPEC 2018-D72 -- 85628, 66251, 15745, 13553
Z80Northolt Branch Obs. in England, 3 in MPEC 2018-D72 -- 2017 VR12, 508871, 505657
C23Olmen Obs. in Belgium, 1 in MPEC 2018-D72 -- 2018 CU1
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2018-D72 -- 276033
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2018-D88 -- P/2017 U6
I41Palomar Transient Factory (PTF) in southern California, 5 in MPECs 2018-D72 & 2018-D88 -- P/2017 U6, 509935, 505667, 6053, 1864
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2018-D88 -- P/2017 U6, P/2011 WG113
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2018-D72 -- 443103
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-D76 -- 2018 DT1
033Schwarzschild Obs. in Germany, 10 in MPECs 2018-D75, 2018-D76, 2018-D77, 2018-D78, 2018-D79, 2018-D81, 2018-D83, 2018-D85, 2018-D86 & 2018-D87 -- 2018 DZ1, 2018 DX1, 2018 DW1, 2018 DU1, 2018 DT1, 2018 DS1, 2018 DF2, 2018 DE2, 2018 DC2, 2018 DB2
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-D88 -- P/2017 U6
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2018-D72 & 2018-D74 -- 2018 DV1, 2018 DA1, 2018 AZ, 2018 AF4, 2017 VO15, 2017 SW14, 2017 RY15, 2013 US3, 2009 CR5
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-D72 -- 136849
I52Steward Obs. Mt. Lemmon Station in Arizona, 26 in MPECs 2018-D72, 2018-D74, 2018-D75, 2018-D76, 2018-D77, 2018-D78, 2018-D79, 2018-D80, 2018-D81, 2018-D82, 2018-D83, 2018-D84, 2018-D85, 2018-D86, 2018-D87 & 2018-D88 -- 2018 DZ1, 2018 DY1, 2018 DX1, 2018 DW1, 2018 DV1, 2018 DU1, 2018 DT1, 2018 DS1, 2018 DS, 2018 DF2, 2018 DE2, 2018 DE1, 2018 DD2, 2018 DC2, 2018 DC, 2018 DB2, 2018 DA2, 2018 DA1, 2018 DA, 2018 CZ2, 2018 CU14, 2018 CP14, 2018 CG2, 2017 UH44, P/2017 U6, 2016 LM11
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-D72 -- 2018 AT2
L01Visnjan Obs., 2 in MPECs 2018-D76 & 2018-D87 -- 2018 DT1, 2018 DF2
C51WISE in Earth polar orbit, 2 in MPEC 2018-D72 -- 508767, 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 February '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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 Sentry18002093-211131.89743e-08-7.39-7.410JPL: Computed at 09:01 today Pacific time based on 21 observations spanning 2.1195 days (2018-Feb-25.24603 to 2018-Feb-27.36552). Diameter approximately 0.064 km. from weighted mean H=23.62.
2018 DV1JPL Sentry18002105-210511.861e-08-9.77-9.770JPL: Computed at 08:58 today Pacific time based on 22 observations spanning 1.0391 days (2018-Feb-26.26815 to 2018-Feb-27.30727). Diameter approximately 0.007 km. from weighted mean H=28.40.
2018 DU1JPL Sentry18002060-211032.07261e-07-8.28-8.390JPL: Computed at 09:03 today Pacific time based on 29 observations spanning 1.9963 days (2018-Feb-25.20469 to 2018-Feb-27.20097). Diameter approximately 0.009 km. from weighted mean H=27.79.
2018 DA1JPL Sentry16552047-208492.961185e-07-3.15-3.360JPL: Computed at 08:17 today Pacific time based on 41 observations spanning 8.9253 days (2018-Feb-18.49641 to 2018-Feb-27.42168). Diameter approximately 0.630 km. from weighted mean H=18.67.
2018 CA15NEODyS16552024-211682.04e-08-8.00-8.110NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2018-02-12.404 to 2018-02-13.349."
2018 AT2JPL Sentry16552115-211519.482e-08-8.77-8.770JPL: Computed at 07:57 today Pacific time based on 29 observations spanning 8.2707 days (2018-Jan-12.34078 to 2018-Jan-20.611519). Diameter approximately 0.010 km. from weighted mean H=27.74.
2015 HV182JPL Sentry16552018-21011921.976819e-07-4.55-5.620JPL: Computed at 13:25 April 6th of 2017 Pacific time based on 9 observations spanning .99953 days (2015-Apr-18.27618 to 2015-Apr-19.27571). Diameter approximately 0.157 km. from weighted mean H=21.70.
2008 JD33JPL Sentry16552019-21171592.556918e-07-7.72-8.730JPL: Computed at 23:43 April 6th of 2017 Pacific time based on 13 observations spanning .11183 days (2008-May-15.28689 to 2008-May-15.39872). Diameter approximately 0.009 km. from weighted mean H=28.05.

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 27 February '18

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

1920Generated Traffic Report
1800Noted that JPL Sentry has posted 2018 DU1 as an impact risk - see above
Noted that JPL Sentry has posted 2018 DV1 as an impact risk - see above
Noted that JPL Sentry has posted 2018 DY1 as an impact risk - see above
Grabbed MPEC 2018-D88 - P/2011 WG113 = 2017 U6 (Panstarrs) - see above
1655Noted that JPL Sentry has updated its 2008 JD33 risk assessment - see above
Noted that JPL Sentry has updated its 2015 HV182 risk assessment - see above
Noted that JPL Sentry has updated its 2018 AT2 risk assessment - see above
Noted that NEODyS has posted 2018 CA15 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 DA1 risk assessment - see above
Grabbed MPEC 2018-D72 - Daily Orbit Update - see above
Grabbed MPEC 2018-D73 - 2018 DR1 - see above
Grabbed MPEC 2018-D74 - 2018 DV1 - see above
Grabbed MPEC 2018-D75 - 2018 DS1 - see above
Grabbed MPEC 2018-D76 - 2018 DT1 - see above
Grabbed MPEC 2018-D77 - 2018 DU1 - see above
Grabbed MPEC 2018-D78 - 2018 DW1 - see above
Grabbed MPEC 2018-D79 - 2018 DX1 - see above
Grabbed MPEC 2018-D80 - 2018 DY1 - see above
Grabbed MPEC 2018-D81 - 2018 DZ1 - see above
Grabbed MPEC 2018-D82 - 2018 DA2 - see above
Grabbed MPEC 2018-D83 - 2018 DB2 - see above
Grabbed MPEC 2018-D84 - 2018 DD2 - see above
Grabbed MPEC 2018-D85 - 2018 DC2 - see above
Grabbed MPEC 2018-D86 - 2018 DE2 - see above
Grabbed MPEC 2018-D87 - 2018 DF2 - see above
0530Grabbed MPEC 2018-D71 - 2015 QL14 - see above