Contents  on 5 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 5 February '18

Six objects reported inside ten LD

Bulletin - 2302 UTC:  Three new discoveries of close passers have been announced. These will be included in the next traffic report after we obtain and process further details.

Earth passageI D~Size~Inside ten LDNotes
~2.2 LD ~Jan. 302018 CK19 m Jan. 27 - Feb. 3MPEC
~4.7 LD ~Jan. 312018 CH19 m Jan. 26 - yesterdayMPEC
~9.3 LD ~Feb. 202018 CJ68 m Feb. 19 - 22MPEC


Six planetesimals are reported within ten lunar distances (LD) of our home world today. Nearest are inbound intruder 2018 CC, which enters Earth's SOI (sphere of gravitational influence), moving in from 4.37 to 2.04 LD, and risk-listed 2018 BP6, which comes its closest to Earth this time around -- 3.66 LD at 1001 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  5.8 from 7.2 LD Feb. 3 - 16 EPU +/- 49 mins.*, intruder, risk - DOU
0.49 LD tomorrow 2018 CC 17 m  2.04 from 4.37 LD Feb. 2 - 11 intruder, enters Earth SOI - DOU
0.73 LD Jan. 19 2018 BC 4 m  7.98 to 8.44 LD Dec. 30 - Feb. 9 intruder, NHATS target, risk
3.66 LD today 2018 BP6 41 m  3.66 LD Feb. 2 - 8 Earth closest at 1001 UTC, risk - DOU
5.31 LD yesterday 2018 AH12 14 m  5.33 to 5.55 LD Jan. 28 - Feb. 12 NHATS target
6.7   LD Jan. 15* 2018 AV2 6 m  7.3 to 7.4 LD Nov. 10 - March 2 EPU +/- 6 mins.*, NHATS target, natural? - DOU
* EPU = Earth passage uncertainty

This report was generated at 2040 UTC with the recovery of distant 425755 2011 CP4 and first follow-up for inbound intruders 2018 CC and risk-listed 2018 CB in today's DOU MPEC along with continuing follow-up for passing risk-listed 2018 BP6, outbound 2018 AV2, and seven departed objects: 2018 BZ5, 2018 BQ, 2018 AW11, 2017 YW3, 2017 YR3, 2017 XS, and risk-listed intruder 2018 BN6, plus distant 2014 EY24 and 2012 OQ. The DOU also has follow-up from mid-December for risk-listed NHATS target 2017 WT28, doubling its observation arc from 8.94 to 17.98 days.

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  31.1 from 32.9 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 267 m  40.47 from 41.78 LD Feb. 28 - March 13 radar/NHATS target
6.9   LD March 10* 2015 DK200 26 m  63.0 from 65.3 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
* EPU = Earth passage uncertainty


Reading:  Among recent scientific papers of interest is the discovery of what appears to be the first known carbonaceous asteroid in the Kuiper Belt. Another describes looking for interstellar comets in the existing catalog of Solar System objects and finding eight candidates. And, speaking of interstellar, the SETI Insitute has an item about what has been surprising about 1I/`Oumuamua (A/2017 U1) (more info).



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. "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 5 February '18

The MPC's NEO Confirmation Page has 45 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 45 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 5 February '18

Minor Planet Electronic Circulars

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


MPEC 2018-C20 - "22:58 UT" - 2018 CK


MPEC 2018-C19 - "22:55 UT" - 2018 CJ


MPEC 2018-C18 - "22:49 UT" - 2018 CH


<< DOU on 5 Feb. '18 >>  MPEC 2018-C17 - "13:03 UT" - Daily Orbit Update

Observers  on 5 February '18

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2018-C17 -- 2018 CC
T08ATLAS Mauna Loa in Hawaii, 14 in MPEC 2018-C17 -- 2018 BT6, 96315, 53110, 511684, 509353, 385580, 302311, 17511, 143992, 137805, 8567, 8037, 7977, 6053
160Castelmartini Obs. in Italy, 3 in MPEC 2018-C17 -- 68950, 11066, 1980
703Catalina Sky Survey (CSS) in Arizona, 20 in MPECs 2018-C17 & 2018-C18 -- 2018 CH, 2018 AE2, 2016 BA39, 2015 BS509, 2002 CB19, 96590, 508997, 508912, 504928, 374851, 36284, 337228, 307493, 259802, 185853, 174881, 152931, 101873, 1866, 1864
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2018-C17 -- 2017 WT28
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-C17 -- 2018 CC
X31Galilei Obs., 1 in MPEC 2018-C17 -- 2018 BP6
J95Great Shefford Obs. in England, 1 in MPEC 2018-C18 -- 2018 CH
U69.program code "." (23) via iTelescope Obs. Auberry in northern California, 1 in MPEC 2018-C17 -- 2018 CB
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 14 in MPEC 2018-C17 -- 2018 BY6, 2018 AW11, 2018 AV, 2017 YW3, 2017 YR3, 2017 YO6, 2017 XS, 2017 XL2, 2017 WX12, 2017 WN28, 2017 UX5, 2017 SV20, 2017 RL, 2015 KJ57
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2018-C18, 2018-C19 & 2018-C20 -- 2018 CK, 2018 CJ, 2018 CH
G96Mt. Lemmon Survey (MLS) in Arizona, 33 in MPECs 2018-C17, 2018-C19 & 2018-C20 -- 2018 CK, 2018 CJ, 2017 YM6, 2017 TC4, 2015 BF4, 2012 OQ, 2010 VX39, 2005 CV38, 1997 GC32, 68350, 509569, 509353, 508861, 504034, 497176, 496818, 425755, 417217, 403039, 40267, 277616, 24761, 242708, 192563, 175729, 162273, 162038, 159467, 153311, 141670, 8567, 5836, 1980
K74Muensterschwarzach Obs. in Germany, 3 in MPEC 2018-C17 -- 96590, 507366, 1627
C47Nonndorf Obs. in Austria, 2 in MPEC 2018-C17 -- 2018 BT6, 511684
J69North Obs. in England, 2 in MPEC 2018-C17 -- 2018 BA7, 508912
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2018-C17 & 2018-C19 -- 2018 CJ, 2014 EY24, 508912, 506859, 499672, 1980
D29Purple Mtn. Obs. Xuyi Station in China, 11 in MPEC 2018-C17 -- 1999 AF4, 511064, 385580, 265187, 194126, 190208, 185853, 140039, 136849, 9950, 1866
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-C18 -- 2018 CH
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-C17 -- 505657
691Spacewatch 0.9m telescope in Arizona, 15 in MPECs 2018-C17 & 2018-C19 -- 2018 CJ, 2018 BZ2, 2018 BQ, 2018 BP, 2018 AV2, 2018 AF3, 2018 AF13, 2017 YM6, 2017 YF7, 2017 SS19, 2017 RD15, 2017 NU6, 2016 CW31, 508861, 5620
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2018-C17 -- 2018 BS, 2018 BN6, 2018 BH5, 2018 AB12, 2017 YA8, 2017 SL14, 2017 QV34, 2014 FO47, 2002 PO75
I52Steward Obs. Mt. Lemmon Station in Arizona, 23 in MPECs 2018-C17, 2018-C18, 2018-C19 & 2018-C20 -- 2018 CK, 2018 CJ, 2018 CH, 2018 BZ5, 2018 BT6, 2018 BR6, 2018 BP6, 2018 BP5, 2018 BP1, 2018 BL6, 2018 BL3, 2018 BJ3, 2018 BD3, 2018 AM13, 2018 AF4, 2018 AF13, 2017 YR1, 2017 YP4, 2017 XV2, 2017 XK61, 2017 XB1, 2017 WE16, 2017 SW14
L01Visnjan Obs., 4 in MPECs 2018-C17, 2018-C18, 2018-C19 & 2018-C20 -- 2018 CK, 2018 CJ, 2018 CH, 2018 CB
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 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 CBJPL Sentry17052031-2057102.9156569e-05-4.88-4.930JPL: Computed at 08:48 today Pacific time based on 34 observations spanning 1.0779 days (2018-Feb-04.21773 to 2018-Feb-05.29564). Diameter approximately 0.022 km. from weighted mean H=25.96.
2018 BP6JPL Sentry17052074-207411.252e-07-6.67-6.670JPL: Computed at 08:42 today Pacific time based on 60 observations spanning 9.0131 days (2018-Jan-27.35282 to 2018-Feb-05.36593). Diameter approximately 0.041 km. from weighted mean H=24.58.
NEODyS03072076-207932.73e-07-6.39-6.390NEODyS: "Based on 53 optical observations (of which 6 are rejected as outliers) from 2018-01-27.354 to 2018-02-03.549."
2018 BN6JPL Sentry17052082-2117171.787308e-05-5.84-6.050JPL: Computed at 08:55 today Pacific time based on 47 observations spanning 9.0848 days (2018-Jan-27.19371 to 2018-Feb-05.27855). Diameter approximately 0.015 km. from weighted mean H=26.78.
NEODyS03072078-2117512.71e-05-5.65-5.810NEODyS: "Based on 45 optical observations (of which 3 are rejected as outliers) from 2018-01-27.195 to 2018-02-04.441."
2018 AB12NEODyS0307210216.16e-10-9.29-9.290NEODyS: "Based on 57 optical observations (of which 0 are rejected as outliers) from 2018-01-14.378 to 2018-02-04.334."
2018 AE4NEODyS0307211014.47e-08-7.39-7.390NEODyS: "Based on 69 optical observations (of which 5 are rejected as outliers) from 2018-01-13.463 to 2018-02-04.271."
2017 YE8NEODyS0307R E M O V E D-
2017 WT28JPL Sentry17052083-2117560.002710925586-4.50-4.570JPL: Computed at 08:30 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.
2002 CB19JPL Sentry0307R E M O V E DJPL: Risk listing removed at 0041 UTC today

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 5 February '18

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

2300Grabbed MPEC 2018-C18 - 2018 CH - see above
Grabbed MPEC 2018-C19 - 2018 CJ - see above
Grabbed MPEC 2018-C20 - 2018 CK - see above
2040Generated Traffic Report
1705Noted that JPL Sentry has updated its 2017 WT28 risk assessment - see above
Noted that JPL Sentry has updated its 2018 BN6 risk assessment - see above
Noted that JPL Sentry has updated its 2018 BP6 risk assessment - see above
Noted that JPL Sentry has updated its 2018 CB risk assessment - see above
Grabbed MPEC 2018-C17 - Daily Orbit Update - see above
0307Noted that JPL Sentry has removed 2002 CB19 as an impact risk - see above
Noted that NEODyS has removed 2017 YE8 as an impact risk - see above
Noted that NEODyS has updated its 2018 AB12 risk assessment - see above
Noted that NEODyS has updated its 2018 AE4 risk assessment - see above
Noted that NEODyS has updated its 2018 BN6 risk assessment - see above
Noted that NEODyS has updated its 2018 BP6 risk assessment - see above