Contents  on 8 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 8 February '18

Ten objects reported inside ten LD

There are ten minor planets reported passing within ten lunar distances (LD) of Earth today. Nearest are intruder 2018 CB, which enters Earth's sphere of gravitational influence (SOI), flying in from 2.87 to 1.41 LD, and intruder 2018 CC, heading out from 2.78 to 5.11 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
0.18 LD tomorrow 2018 CB 22 m  1.41 from 2.87 LD Feb. 3 - 16 intruder, NHATS target, enters Earth SOI - DOU
0.49 LD Feb. 6 2018 CC 16 m  2.78 to 5.11 LD Feb. 2 - 11 intruder
0.73 LD Jan. 19 2018 BC 4 m  9.38 to 9.84 LD Dec. 30 - tomorrow intruder, NHATS target, risk
1.27 LD yesterday 2018 CN 18 m  3.83 to 8.17 LD Feb. 4 - 9
2.14 LD Feb. 6 2018 CM 9 m  3.48 to 5.34 LD Feb. 2 - 11 risk
2.34 LD Feb. 6 2018 CL 27 m  4.15 to 5.83 LD Feb. 1 - 11 NHATS target
3.66 LD Feb. 5 2018 BP6 41 m  8.77 to 11.64 LD Feb. 2 - 8 exits ten LD, risk
5.31 LD Feb. 4 2018 AH12 14 m  6.56 to 7.27 LD Jan. 28 - Feb. 12 NHATS target
5.65 LD Feb. 11 2018 CX 31 m  9.10 from 11.16 LD today - Feb. 15 enters ten LD - DOU
6.66 LD Jan. 15 2018 AV2 6 m  7.50 to 7.57 LD Nov. 10 - March 2 NHATS target, natural? - DOU

This report was generated at 1910 UTC with the discovery of already departed 2018 CA1 (DOU), which passed us at 7.83 LD on February 4th. Today's DOU MPEC also has first follow-up for departed risk-listed 2018 CK and continuing follow-up for inbound objects 2018 CX and intruder 2018 CB, plus slowly outbound 2018 AV2, departed 2018 CH, and distant objects 2014 EY24 and 450894 2008 BT18.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.5   LD Feb. 15* 2018 CB1 27 m  18.4 from 20.6 LD Feb. 13 - 16 EPU +/- 6 mins.*
3.7   LD Feb. 24* 2017 DR109 10 m  25.8 from 27.6 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
9.2   LD Feb. 20* 2018 CJ 63 m  40.5 from 44.0 LD Feb. 19 - 21 EPU +/- 6 mins.*
3.76 LD March 7 2017 VR12 267 m  36.52 from 37.84 LD Feb. 28 - March 13 radar/NHATS target
6.9   LD March 10* 2015 DK200 26 m  56.4 from 58.5 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
* EPU = Earth passage uncertainty


Reading:  The ESA Advanced Concepts Team has posted a science paper on how they selected 143 possible targets for the proposed low-thrust Cubesat M-Argo mission to near-Earth asteroids. Two other recent papers describe NEO surveys -- the now operational ATLAS (paper/home) and the coming LSST (paper/home) programs. What correlation is there between the Chicxulub impact, a global volcanism event, the Deccan Traps, and, yes, the demise of the dinosaurs? This subject is briefly explained in a news release from the University of Oregon and is explored in a paper available to the public.



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 come within ten LD since A/CC began these traffic reports (2007) but are not currently so close. Object temporal distances are derived by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 8 February '18

The MPC's NEO Confirmation Page has 63 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 63 objects listed. Of these, 24 were "one nighters." So far The Tracking News has counted a total of 65 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 8 February '18

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-C44 - "22:47 UT" - 2018 CB


MPEC 2018-C43 - "20:54 UT" - 2013 QH10


<< DOU on 8 Feb. '18 >>  MPEC 2018-C42 - "13:04 UT" - Daily Orbit Update

Observers  on 8 February '18

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2018-C42 -- 511684, 508912
T08ATLAS Mauna Loa in Hawaii, 16 in MPEC 2018-C42 -- 2017 XB2, 2008 DG17, 1999 AF4, 509353, 495848, 436325, 411201, 322763, 311554, 163691, 153349, 14402, 138013, 11405, 8567, 2329
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-C42 -- 2018 CB
703Catalina Sky Survey (CSS) in Arizona, 22 in MPEC 2018-C42 -- 2018 CX, 2018 CA1, 2018 CA, 2017 YP4, 2017 SO17, 2015 BS509, 508997, 459386, 455659, 374851, 36284, 337228, 307493, 259802, 194126, 185853, 154347, 152931, 101873, 1981, 1866, 1864
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-C42 -- 2018 BO1
113Drebach Obs. in Germany, 1 in MPEC 2018-C42 -- 2018 CA1
006Fabra Obs. in Spain, 3 in MPEC 2018-C42 -- 2017 SR32, 511684, 508912
595Farra d'Isonzo Obs. in Italy, 2 in MPEC 2018-C42 -- 2018 CB, 2018 CA1
J95Great Shefford Obs. in England, 1 in MPEC 2018-C42 -- 2018 CA1
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2018-C42 -- 2018 BT6
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-C42 -- 2016 CL32
Z43Landehen Obs., 1 in MPEC 2018-C42 -- 259802
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2018-C42 -- 2018 CA1
K95MASTER-II Sutherland in South Africa, 2 in MPEC 2018-C42 -- 143992, 6053
711McDonald Obs. in Texas, 6 in MPEC 2018-C42 -- 2018 CA1, 2018 BZ2, 2018 BY2, 2018 BP1, 2018 BP, 2017 YE5
G96Mt. Lemmon Survey (MLS) in Arizona, 13 in MPEC 2018-C42 -- 2018 CC1, 2018 CA, 2018 BJ5, 2018 AD4, 2015 BS509, 2014 EY24, 508912, 459386, 36284, 267337, 238063, 3122, 1864
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2018-C44 -- 2018 CB
Z80Northolt Branch Obs. in England, 3 in MPEC 2018-C42 -- 2018 CX, 2018 CB, 2017 SR32
C23Olmen Obs. in Belgium, 2 in MPEC 2018-C42 -- 1999 AF4, 511684
I41Palomar Transient Factory (PTF) in southern California, 15 in MPEC 2018-C42 -- 2017 QL33, 2016 CW31, 2015 RL82, 2004 CK39, 508871, 450894, 439908, 259802, 143992, 137078, 8567, 7977, 6053, 1981, 1864
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-C42 -- 2017 RZ17
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2018-C42 -- 9856
L04ROASTERR-1 in Romania, 1 in MPEC 2018-C42 -- 2018 CB
C95SATINO-1 in France, 1 in MPEC 2018-C42 -- 511684
691Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2018-C42 -- 2018 BV, 2018 BK1, 2018 BG5, 2017 YF7, 2017 XV2, 2017 XB2, 2017 TQ3, 2017 SL33, 2016 CW31, 2015 DP155, 2011 EB7
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2018-C42 -- 2018 BS, 2018 BR6, 2018 AV2, 2018 AM13, 2018 AF3, 2018 AB12, 2017 YD
I52Steward Obs. Mt. Lemmon Station in Arizona, 34 in MPECs 2018-C42 & 2018-C43 -- 2018 CK, 2018 CH, 2018 CB, 2018 CA1, 2018 CA, 2018 BY2, 2018 BV, 2018 BT6, 2018 BS1, 2018 BQ1, 2018 BP5, 2018 BO3, 2018 BL6, 2018 BL5, 2018 BL3, 2018 BL1, 2018 BJ5, 2018 BG5, 2018 BG1, 2018 BE3, 2018 BD3, 2018 BB7, 2018 BA7, 2018 AL13, 2018 AJ12, 2018 AH13, 2018 AD4, 2017 YQ3, 2017 UR7, 2017 TH6, 2015 MT59, 2013 QH10, 505657, 325395
926Tenagra II Obs. in Arizona, 2 in MPECs 2018-C43 & 2018-C44 -- 2018 CB, 2013 QH10
L01Visnjan Obs., 1 in MPEC 2018-C42 -- 2018 CA1
C51WISE in Earth polar orbit, 1 in MPEC 2018-C42 -- 12711
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 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 CKJPL Sentry17072066-207131.74516e-07-7.31-7.400JPL: Computed at 07:58 today Pacific time based on 22 observations spanning 3.8054 days (2018-Feb-04.42012 to 2018-Feb-08.22554). Diameter approximately 0.019 km. from weighted mean H=26.30.
2017 WT28JPL Sentry19002081-2117600.003655702011-4.37-4.470JPL: Computed at 10:29 today Pacific time based on 24 observations spanning 17.975 days (2017-Nov-28.29053 to 2017-Dec-16.265521). Diameter approximately 0.008 km. from weighted mean H=28.10.
2017 RZ17JPL Sentry17072019-2116452.81661e-08-4.07-4.270JPL: Computed at 08:24 today Pacific time based on 7 observations spanning .95897 days (2017-Sep-15.36641 to 2017-Sep-16.32538). Diameter approximately 0.371 km. from weighted mean H=19.80.

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 8 February '18

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

2301Grabbed MPEC 2018-C44 - 2018 CB - see above
2100Grabbed MPEC 2018-C43 - 2013 QH10 - see above
1910Generated Traffic Report
1900Noted that JPL Sentry has updated its 2017 WT28 risk assessment - see above
1707Noted that JPL Sentry has updated its 2017 RZ17 risk assessment - see above
Noted that JPL Sentry has updated its 2018 CK risk assessment - see above
Grabbed MPEC 2018-C42 - Daily Orbit Update - see above