Contents  on 17 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 17 February '18

Five objects reported inside ten LD

Five minor objects are reported within ten lunar distances (LD) of our planet today. Nearest is intruder 2018 CD3, which exits Earth's SOI (sphere of gravitational influence), slipping away from 2.17 to 3.76 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  2.17 to 3.76 LD Feb. 9 - 21 intruder, NHATS target, exits Earth SOI
2.05 LD Feb. 12 2018 CH2 8 m  8.87 to 10.84 LD Feb. 7 - 17 exits ten LD
2.23 LD Feb. 15 2018 CU2 9 m  4.25 to 6.02 LD Feb. 10 - 20
6.08 LD Feb. 19 2018 CP2 48 m  7.56 from 9.28 LD yesterday - Feb. 22
6.66 LD Jan. 15 2018 AV2 6 m  8.28 to 8.39 LD Nov. 10 - March 2 NHATS target, natural?

This report was generated at 2020 UTC with three belated discovery announcements in today's DOU MPEC. 2018 BG11 passed us at about 8.6 LD* on December 28th and 2018 AT18 at 4.47 LD on January 9th, while intruder 2018 BL11 came by at around 0.8 LD* (and the Moon at 0.7 LD*) on January 20th. The DOU also has follow-up for departed risk-listed 2018 CK and approaching 2017 VR12. And we note that we missed the discovery of another intruder. 2018 CN2 (MPEC) was announced late on February 10th and has not been reported observed since. It zipped by at 0.18 LD the day before, missing the Moon by 1.23 LD.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
3.7   LD Feb. 24* 2017 DR109 10 m  10.9 from 12.5 LD tomorrow - March 1 EPU +/- 30 mins.*, NHATS target
9.26 LD Feb. 20 2018 CJ 64 m  12.21 from 14.69 LD Feb. 19 - 21
5.17 LD Feb. 24 2018 CE14 25 m  16.11 from 18.32 LD Feb. 20 - 28 NHATS target
3.76 LD March 7 2017 VR12 273 m  24.48 from 25.83 LD Feb. 28 - March 13 radar/NHATS target - DOU
6.9   LD March 10* 2015 DK200 26 m  37.9 from 39.9 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 17 February '18

The MPC's NEO Confirmation Page has 32 listings

When last checked at 2323 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 32 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 39 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 17 February '18

Minor Planet Electronic Circulars

As of last check at 2323 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-D20 - "16:11 UT" - 2018 CP14


MPEC 2018-D19 - "16:07 UT" - 2018 CO14


<< DOU on 17 Feb. '18 >>  MPEC 2018-D18 - "13:04 UT" - Daily Orbit Update

Observers  on 17 February '18

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-D20 -- 2018 CP14
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2018-D20 -- 2018 CP14
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2018-D20 -- 2018 CP14
703Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2018-D18 -- 66400, 496981, 496816
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPEC 2018-D18 -- 2018 CL14, 2018 BL11
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPEC 2018-D18 -- 2018 CS3, 2018 CK, 2018 BV, 2018 BP5, 2018 BL3, 2018 AL13, 2017 YP5, 2017 WO28, 2017 UP2, 2017 UK2, 2017 TH6
K65Cesena Obs. in Italy, 1 in MPEC 2018-D20 -- 2018 CP14
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2018-D20 -- 2018 CP14
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-D18 -- 2018 CQ3
734Farpoint Obs. in Kansas, 1 in MPEC 2018-D18 -- 2018 BE11
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-D20 -- 2018 CP14
K83Forti Obs., 7 in MPEC 2018-D18 -- 333888, 311554, 276033, 190208, 137925, 6053, 1981
203GiaGa Obs. in Italy, 1 in MPEC 2018-D20 -- 2018 CP14
K88GINOP-KHK in Hungary, 1 in MPEC 2018-D20 -- 2018 CP14
J95Great Shefford Obs. in England, 1 in MPEC 2018-D20 -- 2018 CP14
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-D20 -- 2018 CP14
Z43Landehen Obs., 6 in MPEC 2018-D18 -- 2017 VR12, 2017 SR32, 508912, 190208, 7977, 6053
K38M57 Obs. in Italy, 1 in MPEC 2018-D20 -- 2018 CP14
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPEC 2018-D18 -- 2018 CL14, 2018 BL11, 2018 AT18
568_Marco Micheli on Mauna Kea in Hawaii, 4 in MPECs 2018-D18 & 2018-D19 -- 2018 CO14, 2018 BG11, 2018 BF11, 2018 BE11
932McCarthy Obs. in Connecticut, 1 in MPEC 2018-D20 -- 2018 CP14
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2018-D18 -- 2018 CL14, 2018 BL11, 2018 AT18
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-D20 -- 2018 CP14
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-D18 -- 496861
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2018-D18 & 2018-D19 -- 2018 CO14, 2018 BG11, 2018 BF11, 2018 BE11
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-D20 -- 2018 CP14
Y00SONEAR in Brazil, 1 in MPEC 2018-D18 -- 4947
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-D19 -- 2018 CO14
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPEC 2018-D18 -- 2018 BL11, 2018 AT18
L01Visnjan Obs., 2 in MPECs 2018-D19 & 2018-D20 -- 2018 CP14, 2018 CO14
C51WISE in Earth polar orbit, 1 in MPEC 2018-D18 -- 136839
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 February '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2323 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 CKNEODyS17412070-208846.61e-08-7.82-7.980NEODyS: "Based on 35 optical observations (of which 2 are rejected as outliers) from 2018-02-04.421 to 2018-02-16.261."
JPL Sentry17002070-207225.1417e-08-7.90-7.940JPL: Computed at 07:56 today Pacific time based on 35 observations spanning 11.840 days (2018-Feb-04.42012 to 2018-Feb-16.25993). Diameter approximately 0.018 km. from weighted mean H=26.39.
2018 BL11JPL Sentry17002091-2118406.50603484e-05-6.06-6.850JPL: Computed at 08:01 today Pacific time based on 20 observations spanning 1.1276 days (2018-Jan-24.2988 to 2018-Jan-25.42644). Diameter approximately 0.007 km. from weighted mean H=28.31.

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 17 February '18

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

2020Generated Traffic Report
1741Noted that NEODyS has updated its 2018 CK risk assessment - see above
1700Noted that JPL Sentry has posted 2018 BL11 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 CK risk assessment - see above
Grabbed MPEC 2018-D18 - Daily Orbit Update - see above
Grabbed MPEC 2018-D19 - 2018 CO14 - see above
Grabbed MPEC 2018-D20 - 2018 CP14 - see above