Contents  on 22 January '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 22 January '18

Ten objects reported inside ten LD

Ten transient natural objects are known to be less than ten lunar distances (LD) from Earth today. Nearest is risk-listed intruder 2018 BC, which remains inside our planet's SOI (sphere of gravitational influence) while receding from 1.35 to 1.80 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
0.10 LD Jan. 18 2018 BD 3 m  6.77 to 8.78 LD Jan. 13 - 23 intruder, NHATS target, risk
0.43 LD Jan. 15 2018 BW 8 m  9.40 to 10.86 LD Jan. 8 - 22 intruder, NHATS target, exits ten LD
0.73 LD Jan. 19 2018 BX 5 m  2.71 to 3.94 LD Jan. 12 - 27 intruder, NHATS target
0.73 LD Jan. 19 2018 BC 4 m  1.35 to 1.80 LD Dec. 30 - Feb. 9 intruder, NHATS target, inside Earth SOI, risk - DOU
1.40 LD Jan. 17 2018 AG4 22 m  9.47 to 11.51 LD Jan. 12 - 22 NHATS target, exits ten LD
3.02 LD Jan. 24 2018 BA3 21 m  4.57 from 6.04 LD Jan. 19 - 30 NEW - MPEC, DOU
4.64 LD tomorrow 2018 AJ 39 m  4.69 from 5.02 LD Jan. 16 - 30 NHATS target
6.7   LD Jan. 15* 2018 AV2 6 m  6.7 to 6.7 LD Nov. 9 - March 3 EPU +/- 11 mins.*, NHATS target, natural? - DOU
6.97 LD tomorrow 2018 AK12 31 m  7.05 from 9.24 LD yesterday - Jan. 24
9.27 LD Jan. 27 2018 BQ 26 m  9.89 from 10.17 LD today - Feb. 1 NHATS target, enters ten LD

This report was generated at 1918 UTC with the discoveries announced late yesterday of inbound 2018 BA3 (MPEC, DOU) and already departed 2018 BB3 (MPEC, DOU), which went by Earth at 4.76 LD on January 17th. Today's DOU MPEC has first follow-up for departed 2018 BW1 and continuing follow-up for approaching 2018 AH12 and 2017 VR12, outbound objects 2018 AV2 and risk-listed intruder 2018 BC, and three departed objects: 2018 AW11, intruder 2018 AH, and risk-listed 2018 BH1.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
3.1   LD Jan. 27* 2018 BU1 42 m  11.1 from 13.6 LD tomorrow - Jan. 30 EPU +/- 6 mins.*
8.01 LD Jan. 26 2018 AL12 34 m  15.71 from 19.59 LD Jan. 24 - 27 risk
5.31 LD Feb. 4 2018 AH12 14 m  15.35 from 16.46 LD Jan. 28 - Feb. 12 NHATS target - DOU
3.7   LD Feb. 24* 2017 DR109 10 m  58.4 from 60.5 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 269 m  58.60 from 59.89 LD Feb. 28 - March 13 radar/NHATS target - DOU
6.9   LD March 10* 2015 DK200 26 m  100.4 from 97.7 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 22 January '18

The MPC's NEO Confirmation Page has 116 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 116 objects listed. Of these, 69 were "one nighters." So far The Tracking News has counted a total of 121 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 22 January '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.


MPEC 2018-B91 - "14:46 UT" - 2016 CJ195


<< DOU on 22 Jan. '18 >>  MPEC 2018-B90 - "13:05 UT" - Daily Orbit Update

Observers  on 22 January '18

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 5 in MPEC 2018-B90 -- 2015 BN509, 507366, 505667, 259802, 190208
T08ATLAS Mauna Loa in Hawaii, 5 in MPEC 2018-B90 -- 495848, 311554, 265032, 141484, 1036
160Castelmartini Obs. in Italy, 15 in MPEC 2018-B90 -- 2009 QL8, 2003 UO12, 85628, 507366, 505667, 265187, 259802, 25916, 190208, 143992, 137925, 136839, 6053, 1981, 1627
J27El Guijo Obs. in Spain, 6 in MPEC 2018-B90 -- 2015 YR1, 1999 AF4, 439908, 302311, 8567, 7977
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2018-B91 -- 2016 CJ195
H15ISON New Mexico Obs. in New Mexico, 3 in MPEC 2018-B90 -- 2017 VR12, 2017 SO17, 237805
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2018-B90 -- 2008 DG17, 185853, 1981
204Schiaparelli Obs. in Italy, 5 in MPEC 2018-B90 -- 2018 AH, 2018 AG, 2018 AF1, 2017 YS8, 138175
033Schwarzschild Obs. in Germany, 1 in MPEC 2018-B90 -- 2018 BA3
Y28Sertao de Itaparica Obs. in Brazil, 1 in MPEC 2018-B91 -- 2016 CJ195
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2018-B90 -- 2018 AH12, 2017 YT5, 2017 XL2, 2017 SV20, 2017 OP19, 2016 GA222, 2001 XP31
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-B90 -- 8567, 7977
I52Steward Obs. Mt. Lemmon Station in Arizona, 29 in MPEC 2018-B90 -- 2018 BX1, 2018 BW1, 2018 BV1, 2018 BU, 2018 BT1, 2018 BS1, 2018 BP, 2018 BA, 2018 AX3, 2018 AW11, 2018 AV11, 2018 AR2, 2018 AN12, 2018 AM13, 2018 AM12, 2018 AL13, 2018 AJ12, 2018 AH2, 2018 AH13, 2018 AF3, 2018 AF13, 2018 AF12, 2018 AE4, 2018 AC12, 2018 AB12, 2018 AA12, 2017 SQ11, 2009 UM, 2003 UO12
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 6 in MPEC 2018-B90 -- 2018 BO1, 2018 BL1, 2018 BH1, 2018 BC, 2018 AV2, 2018 AD4
L01Visnjan Obs., 1 in MPEC 2018-B90 -- 2018 BB3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 January '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 BO1JPL Sentry1700R E M O V E DJPL: Risk listing removed at 1556 UTC today
2018 BL1JPL Sentry17002108-210818.933e-10-8.36-8.360JPL: Computed at 08:37 today Pacific time based on 16 observations spanning 4.0507 days (2018-Jan-16.41583 to 2018-Jan-20.466575). Diameter approximately 0.068 km. from weighted mean H=23.49.
2018 BH1NEODyS07462095-210025.67e-08-7.41-7.640NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2018-01-16.351 to 2018-01-21.466."
2018 BPJPL Sentry17002046-2116225.678489e-07-4.08-4.360JPL: Computed at 08:47 today Pacific time based on 46 observations spanning 5.9518 days (2018-Jan-16.15431 to 2018-Jan-22.10614). Diameter approximately 0.270 km. from weighted mean H=20.53.
NEODyS07462048-211471.69e-09-6.84-7.180NEODyS: "Based on 42 optical observations (of which 5 are rejected as outliers) from 2018-01-16.155 to 2018-01-20.245."
2018 BCJPL Sentry17002083-2109154.28288e-05-6.93-7.670JPL: Computed at 08:57 today Pacific time based on 54 observations spanning 3.2932 days (2018-Jan-17.21005 to 2018-Jan-20.503299). Diameter approximately 0.004 km. from weighted mean H=29.42.

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 22 January '18

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

1918Generated Traffic Report
1700Noted that JPL Sentry has updated its 2018 BC risk assessment - see above
Noted that JPL Sentry has updated its 2018 BL1 risk assessment - see above
Noted that JPL Sentry has removed 2018 BO1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 BP risk assessment - see above
Grabbed MPEC 2018-B90 - Daily Orbit Update - see above
Grabbed MPEC 2018-B91 - 2016 CJ195 - see above
0746Noted that NEODyS has updated its 2018 BH1 risk assessment - see above
Noted that NEODyS has updated its 2018 BP risk assessment - see above