Contents  on 20 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 20 January '18

Nine objects reported inside ten LD

There are nine Solar-System small bodies reported inside ten lunar distances (LD) of Earth today. Risk-listed intruder 2018 BC spends the whole day inside the Earth-Moon system, traveling at a distance from our planet of 0.74 to 0.96 LD, passing the Moon at 1.76 LD at 0350 UTC. (It is lingering inside the Earth-Moon system for 2.55 days.) And intruder 2018 BX moves away a little faster, from 0.73 to 1.52 LD, and flying by the Moon at 1.29 LD at 1622 UTC.

Local 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  2.74 to 4.75 LD Jan. 13 - 23 intruder, NHATS target, risk
0.34 LD Jan. 16 2018 BR1 4 m  6.64 to 8.56 LD Jan. 11 - 21 NEW, intruder - MPEC
0.43 LD Jan. 15 2018 BW 8 m  6.47 to 7.93 LD Jan. 8 - 22 intruder, NHATS target
0.73 LD yesterday 2018 BX 5 m  0.73 to 1.52 LD Jan. 12 - 27 intruder today, NHATS target, Moon closest 1.29 LD at 1622 UTC
0.73 LD yesterday 2018 BC 4 m  0.74 to 0.96 LD Dec. 30 - Feb. 9 intruder today, NHATS target, Moon closest 1.76 LD at 0350 UTC, risk - DOU
1.16 LD Jan. 14 2018 AS2 6 m  9.51 to 11.21 LD Jan. 8 - 20 NHATS target, exits ten LD
1.40 LD Jan. 17 2018 AG4 22 m  5.44 to 7.45 LD Jan. 12 - 22 NHATS target
4.65 LD Jan. 23 2018 AJ 40 m  5.61 from 6.39 LD Jan. 16 - 30 NHATS target - DOU
6.7   LD Jan. 15* 2018 AV2 6 m  6.7 to 6.7 LD Nov. 9 - March 2 EPU +/- 14 mins.*, NHATS target, natural?

This report was updated at 2014 UTC with today's DOU MPEC reporting three discovery announcements stemming from minimal observation in late December. 2017 YM14 passed Earth at 1.52 LD on December 25th, 2017 YK at perhaps 1.9 LD (+/-9.8 hours uncertainty) on December 24th, and 2017 YL14 at 4.49 LD that same day. The DOU also has additional observation of approaching 2018 BU1 and first follow-up for approaching objects 2018 BQ, 2018 AK12, and 2018 AH12, along with continuing follow-up for approaching 2018 AL12, inbound 2018 AJ, outbound risk-listed intruder 2018 BC, and three departed objects: 2018 AW11, 2018 AA4, and 2017 VT14.
        Your early neighborhood planetesimal traffic report was generated at 0640 UTC with the discoveries announced late yesterday of approaching 2018 BU1 (MPEC), outbound intruder 2018 BR1 (MPEC), which zoomed past us at 0.34 LD on January 16th, and two departed objects: 2018 BH1 (MPEC), which slipped by us at about 6.6 LD on December 26th, and 2018 BW1 (MPEC), which went by at 8.66 LD on January 16th.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
6.97 LD Jan. 23 2018 AK12 31 m  13.10 from 17.56 LD tomorrow - Jan. 24 DOU
9.27 LD Jan. 27 2018 BQ 26 m  10.50 from 10.86 LD Jan. 22 - Feb. 1 NHATS target - DOU
3.1   LD Jan. 27* 2018 BU1 42 m  16.1 from 18.6 LD Jan. 23 - 30 NEW, EPU +/- 6 mins.* - MPEC, DOU
8.01 LD Jan. 26 2018 AL12 34 m  23.66 from 27.83 LD Jan. 24 - 27 DOU
5.3   LD Feb. 4* 2018 AH12 14 m  17.6 from 18.7 LD Jan. 28 - Feb. 12 EPU +/- 6 mins.*, NHATS target - DOU
3.7   LD Feb. 24* 2017 DR109 10 m  62.7 from 64.9 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 271 m  61.19 from 62.49 LD Feb. 28 - March 13 radar/NHATS target
6.9   LD March 10* 2015 DK200 26 m  103.1 from 105.9 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
* EPU = Earth passage uncertainty

Reading:  Sky & Telescope has a report on meteorites found from the bolide widely witnessed over Michigan January 6th.



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 20 January '18

The MPC's NEO Confirmation Page has 114 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 114 objects listed. Of these, 82 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 20 January '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-B80 - "22:53 UT" - 2016 CL136


MPEC 2018-B79 - "22:50 UT" - 2016 BD1


MPEC 2018-B78 - "22:48 UT" - 2015 TM178


MPEC 2018-B77 - "22:46 UT" - 2007 OX


<< DOU on 20 Jan. '18 >>  MPEC 2018-B76 - "13:05 UT" - Daily Orbit Update

Observers  on 20 January '18

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPEC 2018-B76 -- 2017 WZ, 311066
T08ATLAS Mauna Loa in Hawaii, 25 in MPEC 2018-B76 -- 2018 AG, 2017 QL33, 2015 YR1, 2009 QL8, 2007 AT2, 1999 AF4, 68278, 53110, 507366, 505667, 496861, 439908, 348314, 302311, 259802, 190208, 17511, 162998, 162011, 153349, 143992, 136849, 8037, 6053, 1980
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2018-B76 -- 2018 BS1
160Castelmartini Obs. in Italy, 3 in MPEC 2018-B76 -- 2007 AG, 53110, 6050
703Catalina Sky Survey (CSS) in Arizona, 31 in MPEC 2018-B76 -- 2017 YR1, 2017 YK14, 2017 SS19, 2007 AG, 2006 OD7, 2006 OC5, 2004 BB, 2002 RN38, 1999 AF4, 85990, 85628, 53430, 53319, 507366, 505667, 440212, 333888, 265187, 25916, 220839, 162998, 154991, 141874, 138013, 136923, 136849, 100926, 6050, 2202, 1980, 1627
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 27 in MPECs 2018-B76, 2018-B78, 2018-B79 & 2018-B80 -- 2018 BG1, 2018 AP12, 2018 AN2, 2018 AM12, 2018 AK13, 2018 AG12, 2018 AD12, 2018 AB12, 2017 YW5, 2017 YQ3, 2017 YP8, 2017 YO4, 2017 YL6, 2017 YC8, 2017 XJ1, 2017 XG2, 2017 XC62, 2017 WW12, 2017 WN16, 2017 VU14, 2017 VT14, 2017 PX24, 2016 NT22, 2016 CL136, 2016 BD1, 2015 TM178, 2007 BB50
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2018-B76 -- 2017 WY12
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-B76 -- 2018 BT1
J95Great Shefford Obs. in England, 1 in MPEC 2018-B76 -- 2018 BP
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-B76 -- 2018 AJ
I89'Steven M. Tilley in Louisiana via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2018-B76 -- 2018 AJ
G96Mt. Lemmon Survey (MLS) in Arizona, 15 in MPEC 2018-B76 -- 2018 BU1, 2018 AM12, 2018 AJ13, 2017 YM14, 2017 YL14, 2015 OX78, 2013 PX6, 89355, 506732, 438897, 185853, 159399, 141765, 2329, 1981
K74Muensterschwarzach Obs. in Germany, 3 in MPEC 2018-B76 -- 2017 YN3, 154347, 3122
423North Ryde Obs. in New South Wales, 1 in MPEC 2018-B76 -- 415029
Z80Northolt Branch Obs. in England, 3 in MPEC 2018-B76 -- 2018 BC, 2018 AJ, 2017 YN3
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-B77 -- 2007 OX
K61Rokycany Obs. in the Czech Republic, 2 in MPEC 2018-B76 -- 2018 AQ2, 2018 AD4
033Schwarzschild Obs. in Germany, 3 in MPEC 2018-B76 -- 2018 BQ1, 2018 BK1, 2018 BG1
691Spacewatch 0.9m telescope in Arizona, 17 in MPEC 2018-B76 -- 2018 BS, 2018 BP, 2018 BL1, 2018 AM12, 2018 AL12, 2018 AG13, 2018 AE4, 2018 AB12, 2017 YF7, 2017 WS12, 2017 SV20, 2017 RD15, 2017 OP19, 2017 NU6, 2013 QH48, 96631, 234145
291Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2018-B76 -- 2018 AL2, 2017 XC, 2017 VO15, 2017 TJ1, 2017 SN14, 2015 MN116, 2014 BR8, 2013 OM9
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2018-B76 -- 3122
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2018-B76 -- 2016 AU8, 5587
I52Steward Obs. Mt. Lemmon Station in Arizona, 27 in MPEC 2018-B76 -- 2018 BS, 2018 BQ, 2018 BP, 2018 BB, 2018 BA, 2018 AW11, 2018 AV11, 2018 AP2, 2018 AN3, 2018 AN12, 2018 AK2, 2018 AK12, 2018 AJ13, 2018 AH12, 2018 AG12, 2018 AE13, 2018 AA4, 2018 AA12, 2017 YV7, 2017 YM14, 2017 YL6, 2017 YL14, 2017 YK14, 2017 YE5, 2017 YD8, 2017 XK61, 2017 XB1
926Tenagra II Obs. in Arizona, 2 in MPEC 2018-B76 -- 2017 YM14, 2017 YL14
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-B76 -- 2017 XC
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2018-B76 -- 2017 XO2
C51WISE in Earth polar orbit, 3 in MPEC 2018-B76 -- 399611, 244977, 1627
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 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 Sentry01302028-2117951.878762e-07-4.62-5.100JPL: Computed at 17:07 Jan. 19th Pacific time based on 12 observations spanning 2.8249 days (2018-Jan-16.47525 to 2018-Jan-19.3002). Diameter approximately 0.232 km. from weighted mean H=20.79.
2018 BL1JPL Sentry16502044-210971.43553e-08-6.65-6.740JPL #2 for the day: Computed at 08:34 today Pacific time based on 12 observations spanning 3.8647 days (2018-Jan-16.41583 to 2018-Jan-20.28053). Diameter approximately 0.075 km. from weighted mean H=23.28.
2018 BH1NEODyS16502061-211754.95e-08-7.33-7.680NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2018-01-16.351 to 2018-01-19.223."
JPL Sentry02002067-210231.0901e-08-8.00-8.200JPL: Computed at 17:52 Jan. 19th Pacific time based on 9 observations spanning 2.8723 days (2018-Jan-16.34981 to 2018-Jan-19.22216). Diameter approximately 0.037 km. from weighted mean H=24.82.
2018 BPJPL Sentry17402040-2117788.753108e-07-3.97-4.790JPL: Computed at 08:53 today Pacific time based on 38 observations spanning 4.0272 days (2018-Jan-16.15431 to 2018-Jan-20.1815). Diameter approximately 0.271 km. from weighted mean H=20.47.
2018 BCJPL Sentry17402082-210781.3855e-05-7.40-7.900JPL: Computed at 08:53 today Pacific time based on 50 observations spanning 1.9667 days (2018-Jan-17.21005 to 2018-Jan-19.176764). Diameter approximately 0.004 km. from weighted mean H=29.39.
NEODyS16502097-211191.76e-06-8.29-8.590NEODyS: "Based on 42 optical observations (of which 2 are rejected as outliers) from 2018-01-17.211 to 2018-01-19.178."
2018 AB12NEODyS16502112-211525.68e-08-7.39-7.640NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2018-01-14.378 to 2018-01-19.425."
2017 YM14JPL Sentry16502056-207453.89753e-07-7.59-7.770JPL: Computed at 07:54 today Pacific time based on 15 observations spanning .97623 days (2017-Dec-28.27627 to 2017-Dec-29.2525). Diameter approximately 0.009 km. from weighted mean H=27.75.
2017 YK14JPL Sentry19082075-207511.718e-10-11.60-11.60JPL: Computed at 10:23 today Pacific time based on 11 observations spanning .14126 days (2017-Dec-25.369 to 2017-Dec-25.51026). Diameter approximately 0.008 km. from weighted mean H=28.21.
2017 XO2JPL Sentry16502057-206430.00033138942-2.09-2.091JPL: Computed at 08:05 today Pacific time based on 34 observations spanning 40.892 days (2017-Dec-10.33601 to 2018-Jan-20.227705). Diameter approximately 0.110 km. from weighted mean H=22.43.

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 20 January '18

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

2301Grabbed MPEC 2018-B77 - 2007 OX - see above
Grabbed MPEC 2018-B78 - 2015 TM178 - see above
Grabbed MPEC 2018-B79 - 2016 BD1 - see above
Grabbed MPEC 2018-B80 - 2016 CL136 - see above
2014Updated Traffic Report
1908Noted that JPL Sentry has posted 2017 YK14 as an impact risk - see above
1740Noted that JPL Sentry has updated its 2018 BC risk assessment - see above
Noted that JPL Sentry has updated its 2018 BP risk assessment - see above
1650Noted that JPL Sentry has updated its 2017 XO2 risk assessment - see above
Noted that JPL Sentry has posted 2017 YM14 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 BC risk assessment - see above
Noted that NEODyS has posted 2018 BH1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 BL1 risk assessment - see above
Grabbed MPEC 2018-B76 - Daily Orbit Update - see above
0200Noted that JPL Sentry has posted 2018 BH1 as an impact risk - see above
0130Noted that JPL Sentry has posted 2018 BO1 as an impact risk - see above
0100Noted that JPL Sentry has posted 2018 BL1 as an impact risk - see above