Contents  on 11 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 11 February '18

Nine objects reported inside ten LD

Nine planetesimals are reported within ten lunar distances (LD) of our planet today. Closest is intruder 2018 CB, which is outbound from 1.60 to 3.05 LD and out of Earth's sphere of gravitational influence.

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 Feb. 9 2018 CB 22 m  1.60 to 3.05 LD Feb. 3 - 16 intruder, NHATS target, exits Earth SOI
0.49 LD Feb. 6 2018 CC 17 m  9.81 to 12.16 LD Feb. 2 - 11 intruder, NHATS target, exits ten LD
2.04 LD tomorrow 2018 CH2 8 m  2.54 from 4.08 LD Feb. 7 - 17
2.14 LD Feb. 6 2018 CM 9 m  9.43 to 11.53 LD Feb. 2 - 11 exits ten LD, risk
2.34 LD Feb. 6 2018 CL 27 m  9.46 to 11.32 LD Feb. 1 - 11 NHATS target, exits ten LD
5.31 LD Feb. 4 2018 AH12 14 m  8.94 to 9.86 LD Jan. 28 - tomorrow NHATS target
5.65 LD today 2018 CX 31 m  5.65 LD Feb. 8 - 15 Earth closest at 2103 UTC
6.50 LD today 2018 CB2 35 m  6.50 LD Feb. 9 - 13 Earth closest at 1224 UTC
6.66 LD Jan. 15 2018 AV2 6 m  7.73 to 7.81 LD Nov. 10 - March 2 NHATS target, natural?

This report was generated at 1916 UTC with the discovery announced late yesterday of approaching 2018 CP2 (MPEC), and with follow-up in today's DOU MPEC for approaching 2017 VR12 and distant 450894 2008 BT18, plus astrometry from last month for 2018 AJ.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.59 LD Feb. 15 2018 CB1 28 m  12.57 from 14.37 LD Feb. 14 - 16
6.08 LD Feb. 19 2018 CP2 46 m  20.62 from 23.08 LD Feb. 16 - 22 NEW - MPEC
3.7   LD Feb. 24* 2017 DR109 10 m  20.7 from 22.4 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
9.26 LD Feb. 20 2018 CJ 63 m  30.30 from 33.68 LD Feb. 19 - 21
3.76 LD March 7 2017 VR12 267 m  32.54 from 33.87 LD Feb. 28 - March 13 radar/NHATS target - DOU
6.9   LD March 10* 2015 DK200 26 m  50.0 from 52.1 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. "Distant" is used here to describe objects that have approached Earth within ten LD since A/CC began these traffic reports eleven years ago but are not presently coming 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 11 February '18

The MPC's NEO Confirmation Page has 82 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 82 objects listed. Of these, 36 were "one nighters." So far The Tracking News has counted a total of 86 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 11 February '18

Minor Planet Electronic Circulars

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


<< DOU on 11 Feb. '18 >>  MPEC 2018-C78 - "13:06 UT" - Daily Orbit Update


MPEC 2018-C77 - "02:12 UT" - Comet P/2018 C1 (Lemmon-Read)

Observers  on 11 February '18

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
T08ATLAS Mauna Loa in Hawaii, 10 in MPEC 2018-C78 -- 2010 CR1, 2007 PV27, 96189, 66251, 507366, 265187, 174050, 141484, 1685, 1036
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-C77 -- P/2018 C1
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2018-C77 & 2018-C78 -- P/2018 C1, 2018 BJ7
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-C78 -- 2017 UA1
V16Dark Sky New Mexico Obs. in New Mexico, 1 in MPEC 2018-C78 -- 505657
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-C77 -- P/2018 C1
203GiaGa Obs. in Italy, 1 in MPEC 2018-C77 -- P/2018 C1
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-C77 -- P/2018 C1
K38M57 Obs. in Italy, 3 in MPEC 2018-C78 -- 2017 VR12, 2007 LU19, 505657
G96Mt. Lemmon Survey (MLS) in Arizona, 26 in MPECs 2018-C77 & 2018-C78 -- P/2018 C1, 2018 BQ1, 2018 BL5, 2018 BJ7, 2018 BH6, 2018 BG5, 2018 BE3, 2017 XV2, 2017 UR7, 2016 CA138, 2012 DG61, 2000 YG29, 88213, 511808, 511243, 509520, 496861, 457768, 446791, 39572, 27346, 258325, 154300, 152680, 12711, 6053
I41Palomar Transient Factory (PTF) in southern California, 14 in MPECs 2018-C77 & 2018-C78 -- P/2018 C1, 2017 QL33, 2015 RL82, 508861, 505667, 496861, 450894, 439908, 259802, 190208, 143992, 6053, 1981, 1866
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPECs 2018-C77 & 2018-C78 -- P/2018 C1, 2018 AJ12, 2015 DP155, 2013 QH10, 509935, 505667, 496816, 142348
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2018-C78 -- 2005 CV38, 96315, 68278
204Schiaparelli Obs. in Italy, 5 in MPEC 2018-C78 -- 2018 BT6, 2018 AJ, 2016 BA39, 2008 OC9, 504928
W88"program code '"' (11) via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-C78 -- 2018 BT6
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2018-C77 & 2018-C78 -- P/2018 C1, 2018 AL13, 2017 XV2, 2017 WE2, 509569
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-C77 -- P/2018 C1
I52Steward Obs. Mt. Lemmon Station in Arizona, 7 in MPECs 2018-C77 & 2018-C78 -- 2018 CC1, P/2018 C1, 2018 BT6, 2018 BP, 2018 BJ5, 2018 BA7, 2017 YM6
Z52The Studios Obs., 2 in MPEC 2018-C78 -- 154347, 3122
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-C78 -- 2017 WL16
C51WISE in Earth polar orbit, 2 in MPEC 2018-C78 -- 509353, 25916
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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
2008 EL68JPL Sentry19002018-21136123.32743089e-05-5.25-6.010JPL: Computed at 11:57 April 9th of 2017 Pacific time based on 8 observations spanning .07124 days (2008-Mar-06.40768 to 2008-Mar-06.47892). Diameter approximately 0.009 km. from weighted mean H=27.92.

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 11 February '18

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

1916Generated Traffic Report
1900Noted that JPL Sentry has updated its 2008 EL68 risk assessment - see above
1630Grabbed MPEC 2018-C78 - Daily Orbit Update - see above
0240Grabbed MPEC 2018-C77 - Comet P/2018 C1 (Lemmon-Read) - see above