Contents  on 6 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 6 February '18

Nine objects reported inside ten LD

Nine minor objects are known to be inside ten lunar distances (LD) of Earth today. Nearest is intruder 2018 CC, which enters the Earth-Moon system coming in from 2.04 LD, passing the Moon at 1.50 LD at 1911 UTC and our planet at 0.49 LD at 2010 UTC, ending the day at 0.62 LD. And the next nearest three objects are all in Earth's sphere of gravitational influence (SOI) and all newly announced. 2018 CN enters Earth's SOI, inbound from 5.46 to 1.53 LD. Risk-listed 2018 CM gets its closest to us on this passage, reaching 2.14 LD at 1718 UTC on its way to pass the Moon by 1.26 LD at 2223 UTC. And 2018 CL comes its closest to Earth this time around -- 2.34 LD at 0507 UTC.

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
0.2   LD Feb. 9* 2018 CB 22 m  4.3 from 5.8 LD Feb. 3 - 16 EPU +/- 5 mins.*, intruder, NHATS target - DOU, MPEC
0.49 LD today 2018 CC 16 m  0.49 LD Feb. 2 - 11 intruder today, NHATS target, Moon closest 1.50 LD
at 1912 UTC, Earth closest at 2010 UTC - DOU
0.73 LD Jan. 19 2018 BC 4 m  8.44 to 8.91 LD Dec. 30 - Feb. 9 intruder, NHATS target, risk
1.27 LD tomorrow 2018 CN 18 m  1.53 from 5.46 LD Feb. 4 - 9 NEW, enters Earth SOI - MPEC
2.14 LD today 2018 CM 9 m  2.14 LD Feb. 2 - 11 NEW, Earth closest at 1718 UTC, Moon closest
1.26 LD at 2223 UTC, risk - MPEC
2.34 LD today 2018 CL 28 m  2.34 LD Feb. 1 - 11 NEW, Earth closest at 0507 UTC - MPEC
3.66 LD yesterday 2018 BP6 41 m  4.08 to 6.10 LD Feb. 2 - 8 risk - DOU
5.31 LD Feb. 4 2018 AH12 14 m  5.55 to 5.97 LD Jan. 28 - Feb. 12 NHATS target
6.7   LD Jan. 15* 2018 AV2 6 m  7.4 to 7.4 LD Nov. 10 - March 2 EPU +/- 5 mins.*, NHATS target, natural? - DOU

This report was updated at 2303 UTC with a follow-up MPEC for 2018 CB and to note that this object is no longer listed as an impact risk.
        Previously this report was updated at 1758 UTC with today's DOU MPEC posting prediscovery and follow-up observation of passing intruder 2018 CC adding 14.80 days to its 1.01-day observation arc, and with follow-up for inbound intruder 2018 CB and outbound objects 2018 AV2 and risk-listed 2018 BP6.
        Your early neighborhood asteroid traffic report was generated at 0520 UTC with six new discoveries. Of the three announced late yesterday, 2018 CJ (MPEC) is on approach (see traffic table below) and the other two have already departed from our ten-LD traffic reporting zone: 2018 CK (MPEC) went by at about 1.8 LD on January 30th (+/- 40 minutes uncertainty) and 2018 CH (MPEC) at 4.63 LD the same day. See the above traffic table and written report for details about the three new objects posted early today: 2018 CN (MPEC), 2018 CM (MPEC), and 2018 CL (MPEC).

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  29.3 from 31.1 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
9.2   LD Feb. 20* 2018 CJ 63 m  47.5 from 51.1 LD Feb. 19 - 21 NEW, EPU +/- 6 mins.* - MPEC
3.76 LD March 7 2017 VR12 267 m  39.16 from 40.47 LD Feb. 28 - March 13 radar/NHATS target
6.9   LD March 10* 2015 DK200 26 m  60.8 from 63.0 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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 6 February '18

The MPC's NEO Confirmation Page has 51 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 51 objects listed. Of these, fifteen were "one nighters." So far The Tracking News has counted a total of 59 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 6 February '18

Minor Planet Electronic Circulars

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


MPEC 2018-C25 - "20:23 UT" - 2018 CB


<< DOU on 6 Feb. '18 >>  MPEC 2018-C24 - "13:04 UT" - Daily Orbit Update


MPEC 2018-C23 - "01:23 UT" - 2018 CL


MPEC 2018-C22 - "01:10 UT" - 2018 CM


MPEC 2018-C21 - "00:53 UT" - 2018 CN

Observers  on 6 February '18

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2018-C24 -- 2018 CC, 2018 BS1, 2018 BP5, 2018 BO3, 2018 BJ5, 2018 BG5, 2018 BG1, 2018 AD4, 2017 XB2, 2017 VH2
T08ATLAS Mauna Loa in Hawaii, 8 in MPEC 2018-C24 -- 36284, 281365, 259802, 16657, 154347, 111253, 3122, 1864
160Castelmartini Obs. in Italy, 14 in MPEC 2018-C24 -- 2017 WL1, 2017 UE45, 2014 YC15, 96590, 85628, 53430, 415029, 294739, 21374, 190208, 143992, 140158, 8567, 1864
703Catalina Sky Survey (CSS) in Arizona, 33 in MPECs 2018-C21, 2018-C22 & 2018-C24 -- 2018 CN, 2018 CM, 2018 BT6, 2018 BJ3, 2018 AE2, 2017 QL33, 2015 RL82, 2015 NJ3, 2009 EV, 2009 CS5, 2005 CV38, 2005 BS27, 2004 CK39, 96315, 88188, 85990, 85818, 68278, 511808, 511243, 508861, 506859, 496861, 440212, 348314, 190208, 17511, 162998, 162038, 143992, 136849, 8037, 6053
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-C24 -- 2005 GL
113Drebach Obs. in Germany, 3 in MPECs 2018-C21, 2018-C22 & 2018-C23 -- 2018 CN, 2018 CM, 2018 CL
595Farra d'Isonzo Obs. in Italy, 4 in MPECs 2018-C21, 2018-C22, 2018-C23 & 2018-C24 -- 2018 CN, 2018 CM, 2018 CL, 2003 CA4
H15ISON New Mexico Obs. in New Mexico, 2 in MPEC 2018-C24 -- 2009 BM2, 385580
U69.program code "." (23) via iTelescope Obs. Auberry in northern California, 1 in MPEC 2018-C24 -- 2018 CB
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-C24 -- 2018 CB
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-C21 -- 2018 CN
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2018-C24 -- 2018 AP18, 2005 GL
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2018-C21 & 2018-C22 -- 2018 CN, 2018 CM
G96Mt. Lemmon Survey (MLS) in Arizona, 20 in MPEC 2018-C24 -- 2017 VH2, 2017 TS3, 2017 SS19, 2015 XK1, 2014 VM, 2011 EB7, 99248, 87024, 53319, 497094, 496981, 438452, 399611, 333888, 15817, 141874, 138013, 137199, 101873, 3102
K74Muensterschwarzach Obs. in Germany, 2 in MPECs 2018-C21 & 2018-C23 -- 2018 CN, 2018 CL
G34Oberfrauendorf Obs. in Germany, 2 in MPECs 2018-C23 & 2018-C25 -- 2018 CL, 2018 CB
C23Olmen Obs. in Belgium, 1 in MPEC 2018-C24 -- 511684
I41Palomar Transient Factory (PTF) in southern California, 3 in MPECs 2018-C23 & 2018-C24 -- 2018 CL, 96315, 190208
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-C24 -- 2018 CC
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPEC 2018-C24 -- 2004 CK39, 508861, 496861, 162011
691Spacewatch 0.9m telescope in Arizona, 22 in MPECs 2018-C21, 2018-C22 & 2018-C24 -- 2018 CN, 2018 CM, 2018 BZ2, 2018 BP, 2018 BO3, 2018 BL1, 2018 BK1, 2018 AV2, 2018 AP12, 2018 AL18, 2018 AG13, 2018 AF13, 2017 YF7, 2017 WS12, 2017 SS19, 2017 RD15, 2017 NU6, 2015 DP155, 2011 MU, 2011 EB7, 2010 FL, 2002 LX
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2018-C24 -- 2018 AX, 2018 AL18, 2018 AG1, 2018 AD12, 2017 SV20, 2016 CO246, 2014 WG365, 2014 BR8, 2010 TC47
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-C24 -- 2018 CB
I52Steward Obs. Mt. Lemmon Station in Arizona, 34 in MPECs 2018-C21, 2018-C22 & 2018-C24 -- 2018 CN, 2018 CM, 2018 CB, 2018 BZ6, 2018 BT6, 2018 BS1, 2018 BQ1, 2018 BP6, 2018 BO3, 2018 BL1, 2018 BK5, 2018 BJ5, 2018 BH6, 2018 BG5, 2018 BG1, 2018 BB7, 2018 BA7, 2018 AZ, 2018 AO18, 2018 AM12, 2018 AG2, 2018 AG, 2017 XH62, 2017 XB2, 2017 WY12, 2017 WE2, 2017 VO15, 2017 VH2, 2017 TS3, 2017 SL33, 2017 KT4, 2013 NZ23, 505657, 443103
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-C24 -- 2017 VX1, 2017 BF29
L01Visnjan Obs., 2 in MPECs 2018-C22 & 2018-C23 -- 2018 CM, 2018 CL
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2018-C24 -- 348314, 1980
C42Xingming Obs. in China, 1 in MPEC 2018-C23 -- 2018 CL
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 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 CMJPL Sentry03052063-211790.00011795148-5.39-5.410JPL: Computed at 18:55 Feb. 5th Pacific time based on 30 observations spanning .64350 days (2018-Feb-05.33111 to 2018-Feb-05.97461). Diameter approximately 0.009 km. from weighted mean H=27.82.
2018 CKJPL Sentry01002066-2112212.012292e-06-6.36-6.940JPL: Computed at 16:57 Feb. 5th Pacific time based on 19 observations spanning .82201 days (2018-Feb-04.42012 to 2018-Feb-05.24213). Diameter approximately 0.019 km. from weighted mean H=26.29.
2018 CBJPL Sentry2215R E M O V E DJPL #2 for the day: Risk listing removed at 2205 UTC today
2018 BP6JPL Sentry17012074-207417.220e-08-6.91-6.910JPL: Computed at 08:38 today Pacific time based on 63 observations spanning 10.103 days (2018-Jan-27.35282 to 2018-Feb-06.45574). Diameter approximately 0.041 km. from weighted mean H=24.56.
2006 UJ185JPL Sentry01322052-211682.136442e-06-7.17-7.530JPL: Computed at 17:07 Feb. 5th Pacific time based on 39 observations spanning 1.1546 days (2006-Oct-28.28933 to 2006-Oct-29.44394). Diameter approximately 0.009 km. from weighted mean H=27.89.

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 6 February '18

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

2303Updated Traffic Report
2215Noted that JPL Sentry has removed 2018 CB as an impact risk - see above
2058Grabbed MPEC 2018-C25 - 2018 CB - see above
1701Noted that JPL Sentry has updated its 2018 BP6 risk assessment - see above
1631Noted that JPL Sentry has updated its 2018 CB risk assessment - see above
1600Grabbed MPEC 2018-C24 - Daily Orbit Update - see above
0305Noted that JPL Sentry has posted 2018 CM as an impact risk - see above
0132Noted that JPL Sentry has updated its 2006 UJ185 risk assessment - see above
Grabbed MPEC 2018-C22 - 2018 CM - see above
Grabbed MPEC 2018-C23 - 2018 CL - see above
0100Noted that JPL Sentry has posted 2018 CK as an impact risk - see above
Grabbed MPEC 2018-C21 - 2018 CN - see above