Contents  on 18 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 18 January '18

Eight objects reported inside ten LD

There are eight asteroidal objects reported inside ten lunar distances (LD) of our planet today. Two newly announced risk-listed intruders are the nearest, both entering the Earth-Moon system today. 2018 BD comes in from 1.35 LD and moves out to 0.72 LD from Earth after passing us at 0.102 LD at 1542 UTC. And 2018 BC slips in from 1.23 LD and ends the day at 0.86 LD, on its way to passing Earth at 0.73 LD tomorrow. Further away, 2018 AG4 exits Earth's SOI (sphere of gravitational influence), flying from 1.81 to 3.50 LD, and newly discovered intruder 2018 BW is outbound from 3.54 to 5.00 LD after sliding past our home world at 0.43 LD three days ago.

Earth passage I D ~Size Distance today  Inside ten LD Notes
0.10 LD today 2018 BD 3 m  0.10 LD Jan. 13 - 23 NEW, intruder today, Earth closest at 1542 UTC, risk - MPEC
0.43 LD Jan. 15 2018 BW 8 m  3.54 to 5.00 LD Jan. 8 - 22 NEW, intruder - MPEC
0.73 LD tomorrow 2018 BC 5 m  0.86 from 1.23 LD Dec. 30 - Feb. 9 NEW, intruder today, NHATS target, inside Earth SOI, risk - MPEC, DOU
1.16 LD Jan. 14 2018 AS2 6 m  6.14 to 7.82 LD Jan. 8 - 20 NHATS target
1.40 LD yesterday 2018 AG4 22 m  1.81 to 3.50 LD Jan. 12 - 22 NHATS target, exits Earth SOI
2.73 LD Jan. 14 2018 AU2 11 m  7.74 to 9.71 LD Jan. 9 - 19
4.64 LD Jan. 23 2018 AJ 40 m  7.31 from 8.31 LD Jan. 16 - 30 NHATS target - DOU
6.7   LD Jan. 15* 2018 AV2 6 m  6.7 to 6.7 LD Nov. 10 - March 2 EPU +/- 34 mins.*, NHATS target, natural?

This report was updated at 2020 UTC with the discoveries of approaching 2018 BQ (MPEC) and two intruders: inbound 2018 BW (MPEC) and passing 2018 BD (MPEC). Today's DOU MPEC has additional observation of inbound risk-listed intruder 2018 BC and follow-up for inbound 2018 AJ and five departed objects: 2018 AW11, 2018 AA4, 2017 YR3, 2017 YH1, and intruder 2018 AH, plus distant 208023 1999 AQ10. It also has observation from November of risk-listed 2017 US that adds 15.59 days to that object's 12.13-day arc, and has astrometry from December for 2017 VG1 and from last April for 2017 FO101.
        Your early local flying rocks traffic report was generated at 0516 UTC with the discoveries of inbound intruder 2018 BC (MPEC) and, from late yesterday, three approaching objects: 2018 AL12 (MPEC), 2018 AH12 (MPEC), and 2018 AK12 (MPEC).

Approaching (sorted by 10-LD bubble entry date)
6.96 LD Jan. 23 2018 AK12 29 m  22.25 from 27.09 LD Jan. 21 - 24 NEW - MPEC
9.27 LD Jan. 27 2018 BQ 26 m  11.26 from 11.69 LD Jan. 22 - Feb. 1 NEW - MPEC
8.0   LD Jan. 26* 2018 AL12 34 m  32.0 from 36.3 LD Jan. 24 - 27 NEW, EPU +/- 6 mins.* - MPEC
5.3   LD Feb. 4* 2018 AH12 14 m  19.9 from 21.1 LD Jan. 28 - Feb. 12 NEW, EPU +/- 21 mins.*, NHATS target - MPEC
3.7   LD Feb. 24* 2017 DR109 10 m  67.1 from 69.4 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 271 m  63.79 from 65.09 LD Feb. 28 - March 13 radar/NHATS target
6.9   LD March 10* 2015 DK200 26 m  108.8 from 111.7 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. "Distant" is used here to describe an object that has come within ten LD since A/CC began these traffic reports (2007) but is not presently 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 18 January '18

The MPC's NEO Confirmation Page has 81 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 81 objects listed. Of these, 31 were "one nighters." So far The Tracking News has counted a total of 125 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 18 January '18

Minor Planet Electronic Circulars

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


MPEC 2018-B49 - "18:22 UT" - 2018 BW


MPEC 2018-B48 - "18:19 UT" - 2018 BV


MPEC 2018-B47 - "18:15 UT" - 2018 BT


MPEC 2018-B46 - "18:00 UT" - 2018 AD13


MPEC 2018-B45 - "17:56 UT" - 2018 BU


MPEC 2018-B44 - "17:53 UT" - 2018 BS


MPEC 2018-B43 - "17:49 UT" - 2018 BR


MPEC 2018-B42 - "17:45 UT" - 2018 BQ


MPEC 2018-B41 - "17:41 UT" - 2018 BP


MPEC 2018-B40 - "17:37 UT" - 2018 AH13


MPEC 2018-B39 - "17:33 UT" - 2018 AG13


MPEC 2018-B38 - "17:30 UT" - 2018 AF13


MPEC 2018-B37 - "17:26 UT" - 2018 AE13


MPEC 2018-B36 - "15:23 UT" - 2018 BD


<< DOU on 18 Jan. '18 >>  MPEC 2018-B35 - "13:05 UT" - Daily Orbit Update


MPEC 2018-B34 - "00:32 UT" - 2018 BC


MPEC 2018-B33 - "00:28 UT" - 2018 BB

Observers  on 18 January '18

A total of 29 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2018-B48 -- 2018 BV
T05ATLAS Haleakala in Hawaii, 24 in MPECs 2018-B33 & 2018-B35 -- 2018 BB, 2018 AQ2, 2018 AF1, 2016 AU8, 2015 BN509, 2007 AT2, 1999 AF4, 88188, 68278, 53110, 361071, 348314, 259802, 190208, 17511, 162998, 162011, 153349, 143992, 136849, 8567, 8037, 2368, 1980
T08ATLAS Mauna Loa in Hawaii, 13 in MPEC 2018-B35 -- 495848, 411201, 311554, 265196, 265032, 16834, 142040, 141484, 138847, 5131, 2329, 1865, 1036
703Catalina Sky Survey (CSS) in Arizona, 29 in MPECs 2018-B34, 2018-B35, 2018-B36 & 2018-B49 -- 2018 BW, 2018 BD, 2018 BC, 2018 AN12, 2018 AJ, 2018 AH, 2017 YT7, 2017 YS8, 2017 YN3, 2017 YF1, 2017 QL33, 2008 DG17, 2005 FL4, 96590, 504928, 504025, 475967, 281365, 228587, 225586, 208023, 194126, 154347, 152931, 137052, 6053, 3122, 1866, 1864
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 35 in MPECs 2018-B35, 2018-B39, 2018-B42 & 2018-B43 -- 2018 BR, 2018 BQ, 2018 AV, 2018 AH2, 2018 AG2, 2018 AG13, 2017 YZ1, 2017 YW4, 2017 YU7, 2017 YU5, 2017 YP5, 2017 YK8, 2017 YA2, 2017 WP12, 2017 WG1, 2017 VG1, 2017 UY4, 2017 US, 2017 UQ4, 2017 UP2, 2017 ST20, 2017 QB17, 2017 PX26, 2017 FO101, 2017 DO109, 2017 CM1, 2016 RW, 2016 RK20, 2016 NK39, 2016 MK, 2016 AX165, 2014 TY33, 2012 YP6, 2011 OB, 2011 HO
J27El Guijo Obs. in Spain, 3 in MPEC 2018-B35 -- 2016 AU8, 302311, 12711
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 7 in MPECs 2018-B35, 2018-B41 & 2018-B49 -- 2018 BW, 2018 BP, 2018 AE4, 2018 AE2, 2018 AB12, 2017 XJ61, 2014 GE53
734Farpoint Obs. in Kansas, 3 in MPECs 2018-B41, 2018-B42 & 2018-B44 -- 2018 BS, 2018 BQ, 2018 BP
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-B34 -- 2018 BC
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2018-B35 -- 2018 AJ
K93LCO Sutherland C in South Africa, 1 in MPEC 2018-B43 -- 2018 BR
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2018-B34, 2018-B36, 2018-B38, 2018-B39, 2018-B41, 2018-B42 & 2018-B47 -- 2018 BT, 2018 BQ, 2018 BP, 2018 BD, 2018 BC, 2018 AG13, 2018 AF13
568_Marco Micheli on Mauna Kea in Hawaii, 3 in MPECs 2018-B35, 2018-B39 & 2018-B40 -- 2018 AH13, 2018 AG13, 2013 VM13
711McDonald Obs. in Texas, 1 in MPEC 2018-B46 -- 2018 AD13
G96Mt. Lemmon Survey (MLS) in Arizona, 21 in MPECs 2018-B33, 2018-B35, 2018-B37, 2018-B38, 2018-B41, 2018-B42 & 2018-B46 -- 2018 BQ, 2018 BP, 2018 BB, 2018 AF13, 2018 AE13, 2018 AD13, 2017 YD, 2017 SV20, 2017 NU6, 2010 XO56, 2010 SA12, 2009 EV, 2009 BM2, 2007 AG, 2006 OC5, 2005 VB7, 2004 BB, 333888, 138013, 136793, 5863
423North Ryde Obs. in New South Wales, 1 in MPEC 2018-B35 -- 415029
Z80Northolt Branch Obs. in England, 2 in MPEC 2018-B35 -- 1999 AF4, 6053
F51Pan-STARRS 1 (PS1) in Hawaii, 26 in MPECs 2018-B35, 2018-B37, 2018-B39, 2018-B40, 2018-B43, 2018-B44, 2018-B45, 2018-B47 & 2018-B48 -- 2018 BV, 2018 BU, 2018 BT, 2018 BS, 2018 BR, 2018 AH13, 2018 AG13, 2018 AE13, 2013 VM13, 2012 QP17, 2009 EV, 2008 CJ70, 85818, 505169, 459872, 31221, 241370, 228587, 219527, 204232, 177255, 163691, 138175, 137805, 137078, 9856
K63Pascoli Obs. in Italy, 2 in MPECs 2018-B33 & 2018-B34 -- 2018 BC, 2018 BB
B49Paus Obs. in Spain, 1 in MPEC 2018-B34 -- 2018 BC
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-B49 -- 2018 BW
033Schwarzschild Obs. in Germany, 6 in MPECs 2018-B33, 2018-B35, 2018-B41, 2018-B42, 2018-B44 & 2018-B45 -- 2018 BU, 2018 BS, 2018 BQ, 2018 BP, 2018 BC, 2018 BB
Y28Sertao de Itaparica Obs. in Brazil, 1 in MPEC 2018-B35 -- 2017 YZ1
691Spacewatch 0.9m telescope in Arizona, 10 in MPECs 2018-B35, 2018-B39, 2018-B42 & 2018-B44 -- 2018 BS, 2018 BQ, 2018 AK2, 2018 AG13, 2018 AD12, 2017 YR3, 2017 XG62, 2017 SV20, 2017 OP19, 2017 NU6
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2018-B35, 2018-B40, 2018-B43 & 2018-B48 -- 2018 BV, 2018 BR, 2018 AH13, 2017 WN28, 2011 CC22
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-B35 -- 153349
I52Steward Obs. Mt. Lemmon Station in Arizona, 30 in MPECs 2018-B34, 2018-B35, 2018-B36, 2018-B37, 2018-B38, 2018-B39, 2018-B40, 2018-B41, 2018-B42, 2018-B44, 2018-B45, 2018-B46, 2018-B47 & 2018-B49 -- 2018 BW, 2018 BU, 2018 BT, 2018 BS, 2018 BQ, 2018 BP, 2018 BD, 2018 BC, 2018 AY11, 2018 AY, 2018 AW11, 2018 AV11, 2018 AN3, 2018 AM3, 2018 AH13, 2018 AG2, 2018 AG13, 2018 AF3, 2018 AF13, 2018 AE4, 2018 AE13, 2018 AD13, 2018 AC12, 2018 AB12, 2018 AA4, 2017 YO6, 2017 YH1, 2017 YG7, 2017 XR60, 2017 XO60
L01Visnjan Obs., 2 in MPECs 2018-B41 & 2018-B49 -- 2018 BW, 2018 BP
C51WISE in Earth polar orbit, 2 in MPEC 2018-B35 -- 438430, 244977
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 BPJPL Sentry20302021-21172391.5508063e-06-3.77-4.680JPL: Computed at 12:18 today Pacific time based on 29 observations spanning 1.9424 days (2018-Jan-16.15431 to 2018-Jan-18.09669). Diameter approximately 0.276 km. from weighted mean H=20.45.
2018 BDJPL Sentry17322032-209286.4907669e-05-6.21-6.210JPL: Computed at 09:26 today Pacific time based on 27 observations spanning .20781 days (2018-Jan-18.3029 to 2018-Jan-18.51071). Diameter approximately 0.003 km. from weighted mean H=30.16.
2018 BCJPL Sentry17022082-2104131.3686e-05-7.34-7.830JPL #2 for the day: Computed at 08:56 today Pacific time based on 35 observations spanning .77439 days (2018-Jan-17.21005 to 2018-Jan-17.98444). Diameter approximately 0.005 km. from weighted mean H=29.29.
2018 AB12JPL Sentry17322113-211421.9157e-08-7.83-7.880JPL: Computed at 09:02 today Pacific time based on 24 observations spanning 3.9769 days (2018-Jan-14.37714 to 2018-Jan-18.35402). Diameter approximately 0.044 km. from weighted mean H=24.45.
2018 AT2NEODyS1600211611.12e-08-9.71-9.710NEODyS: "Based on 30 optical observations (of which 9 are rejected as outliers) from 2018-01-12.335 to 2018-01-17.078."
2018 AE2JPL Sentry17022100-211331.88375e-07-4.24-4.350JPL: Computed at 08:38 today Pacific time based on 24 observations spanning 12.733 days (2018-Jan-05.48148 to 2018-Jan-18.21471). Diameter approximately 0.348 km. from weighted mean H=19.96.
NEODyS16002100-211325.81e-08-4.81-4.810NEODyS: "Based on 22 optical observations (of which 4 are rejected as outliers) from 2018-01-05.482 to 2018-01-17.216."
2017 YZ1JPL Sentry1800R E M O V E DJPL: Risk listing removed at 1735 UTC today
2017 USJPL Sentry16302085-2115160.0013110929846-3.77-4.120JPL: Computed at 08:22 today Pacific time based on 120 observations spanning 27.716 days (2017-Oct-16.34512 to 2017-Nov-13.06145). Diameter approximately 0.022 km. from weighted mean H=25.98.

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 18 January '18

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

2030Noted that JPL Sentry has posted 2018 BP as an impact risk - see above
2020Updated Traffic Report
1831Grabbed MPEC 2018-B46 - 2018 AD13 - see above
Grabbed MPEC 2018-B47 - 2018 BT - see above
Grabbed MPEC 2018-B48 - 2018 BV - see above
Grabbed MPEC 2018-B49 - 2018 BW - see above
1800Noted that JPL Sentry has removed 2017 YZ1 as an impact risk - see above
Grabbed MPEC 2018-B39 - 2018 AG13 - see above
Grabbed MPEC 2018-B40 - 2018 AH13 - see above
Grabbed MPEC 2018-B41 - 2018 BP - see above
Grabbed MPEC 2018-B42 - 2018 BQ - see above
Grabbed MPEC 2018-B43 - 2018 BR - see above
Grabbed MPEC 2018-B44 - 2018 BS - see above
Grabbed MPEC 2018-B45 - 2018 BU - see above
1732Noted that JPL Sentry has updated its 2018 AB12 risk assessment - see above
Noted that JPL Sentry has posted 2018 BD as an impact risk - see above
Grabbed MPEC 2018-B37 - 2018 AE13 - see above
Grabbed MPEC 2018-B38 - 2018 AF13 - see above
1702Noted that JPL Sentry has updated its 2018 AE2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 BC risk assessment - see above
1630Noted that JPL Sentry has updated its 2017 US risk assessment - see above
1600Noted that NEODyS has updated its 2018 AE2 risk assessment - see above
Noted that NEODyS has updated its 2018 AT2 risk assessment - see above
Grabbed MPEC 2018-B35 - Daily Orbit Update - see above
Grabbed MPEC 2018-B36 - 2018 BD - see above
0500Noted that JPL Sentry has posted 2018 BC as an impact risk - see above
0038Grabbed MPEC 2018-B33 - 2018 BB - see above
Grabbed MPEC 2018-B34 - 2018 BC - see above