Contents  on 24 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 24 January '18

Eleven objects reported inside ten LD

Eleven visitors are reported within ten lunar distances (LD) of Earth today. Nearest is risk-listed intruder 2018 BC, which leaves Earth's SOI (sphere of gravitational influence), traveling from 2.27 to 2.75 LD. And 2018 BA3 comes its closest to our planet this time around, reaching 3.01 LD at 2140 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
0.73 LD Jan. 19 2018 BX 5 m  5.19 to 6.44 LD Jan. 12 - 27 intruder, NHATS target
0.73 LD Jan. 19 2018 BC 4 m  2.27 to 2.75 LD Dec. 30 - Feb. 9 intruder, NHATS target, exits Earth SOI, risk
1.19 LD Jan. 20 2018 BP3 6 m  6.16 to 7.71 LD Jan. 13 - 26 risk
3.01 LD today 2018 BA3 20 m  3.01 LD Jan. 19 - 30 Earth closest at 2140 UTC - DOU
3.06 LD Jan. 27 2018 BU1 42 m  6.39 from 8.70 LD yesterday - Jan. 30 DOU
4.14 LD Jan. 20 2018 BH3 31 m  8.44 to 10.29 LD Jan. 15 - 24 NHATS target, exits ten LD - DOU
4.64 LD yesterday 2018 AJ 40 m  4.68 to 5.00 LD Jan. 16 - 30 NHATS target - DOU
6.7   LD Jan. 15* 2018 AV2 6 m  6.8 to 6.8 LD Nov. 10 - March 2 EPU +/- 9 mins.*, NHATS target, natural? - DOU
6.97 LD yesterday 2018 AK12 31 m  8.01 to 11.35 LD Jan. 21 - 24 exits ten LD
8.14 LD Jan. 26 2018 AL12 36 m  9.49 from 12.36 LD today - Jan. 27 enters ten LD - DOU
9.27 LD Jan. 27 2018 BQ 26 m  9.47 from 9.66 LD Jan. 22 - Feb. 1 NHATS target - DOU

This report was generated at 1842 UTC with radar observation of outbound 2018 AV2, which additionally has optical follow-up in today's DOU MPEC. The DOU also has first follow-up for passing 2018 BA3 and continuing follow-up for inbound objects 2018 BU1, 2018 BQ, and risk-listed 2018 AL12, outbound objects 2018 BH3 and 2018 AJ, and departed objects 2018 AW11, 2017 YR3, intruder 2018 BF3, 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
5.31 LD Feb. 4 2018 AH12 14 m  13.17 from 14.25 LD Jan. 28 - Feb. 12 NHATS target
3.7   LD Feb. 24* 2017 DR109 10 m  54.2 from 56.2 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 269 m  56.02 from 57.31 LD Feb. 28 - March 13 radar/NHATS target
6.9   LD March 10* 2015 DK200 26 m  92.3 from 95.0 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.

Radar Astrometry  on 24 January '18

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 0635 UTC when the database was dated 23 Jan.

NEOCP Activity  on 24 January '18

The MPC's NEO Confirmation Page has 100 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 100 objects listed. Of these, 45 were "one nighters." So far The Tracking News has counted a total of 107 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 24 January '18

Minor Planet Electronic Circulars

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


MPEC 2018-B114 - "19:45 UT" - 2018 BK1 = 2011 AM52

Id. G.V. Williams, A. Lowe


<< DOU on 24 Jan. '18 >>  MPEC 2018-B113 - "13:06 UT" - Daily Orbit Update


MPEC 2018-B112 - "04:34 UT" - 2008 OC9

Observers  on 24 January '18

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

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2018 AV2
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2018-B113 -- 141484, 2329
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2018-B113 -- 348314, 8037
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-B113 -- 2018 AQ2
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2018-B113 -- 2008 OC9
703Catalina Sky Survey (CSS) in Arizona, 37 in MPECs 2018-B112 & 2018-B113 -- 2018 BG3, 2017 XH62, 2017 QJ18, 2015 YR1, 2015 BN509, 2014 QS439, 2013 TH5, 2011 FC29, 2009 QL8, 2008 OC9, 2005 BS27, 2004 CK39, 2003 CN17, 2000 YG29, 88188, 68278, 53110, 505667, 496861, 439908, 348314, 27346, 262623, 259802, 259221, 190208, 17511, 172034, 162011, 154589, 143992, 137925, 137805, 136839, 101873, 8037, 6053
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 21 in MPEC 2018-B113 -- 2018 BV, 2018 BU, 2018 BN1, 2018 BK1, 2018 AZ11, 2018 AW11, 2018 AM18, 2018 AL3, 2018 AJ12, 2018 AF4, 2018 AF12, 2017 YY5, 2017 YD, 2017 XJ62, 2017 WD15, 2017 TQ3, 2017 TO4, 2016 DP, 2015 XT168, 2015 BQ510, 2013 AA53
K51Celado Obs. in Italy, 1 in MPEC 2018-B113 -- 2018 AJ2
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2018-B113 -- 2018 BZ2, 2018 BL3, 2018 AT11, 2018 AM18, 2018 AE4, 2017 YA8
006Fabra Obs. in Spain, 1 in MPEC 2018-B113 -- 154347
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2018-B113 -- 2018 BH3
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-B113 -- 2009 BM2
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-B113 -- 2018 BF3
W85LCO Cerro Tololo A in Chile, 2 in MPEC 2018-B113 -- 506491, 3361
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2018-B113 -- 506491
Q64LCO Siding Spring B in New South Wales, 1 in MPEC 2018-B113 -- 3361
K38M57 Obs. in Italy, 1 in MPEC 2018-B113 -- 2018 AQ2
G96Mt. Lemmon Survey (MLS) in Arizona, 39 in MPECs 2018-B112 & 2018-B113 -- 2018 AV2, 2017 UR7, 2017 RH15, 2017 PS30, 2015 YR1, 2014 QS439, 2013 XF22, 2012 BV26, 2011 FC29, 2008 OC9, 2007 XP3, 2007 WB, 2007 AT2, 2005 BS27, 2003 YX1, 2003 UO12, 2003 CN17, 2000 YG29, 1993 BD2, 88213, 68278, 52760, 455659, 451397, 445775, 439908, 386847, 385497, 348306, 323179, 27346, 259802, 259221, 177614, 162011, 152889, 152742, 152680, 143992
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2018-B113 -- 2018 AQ2, 8176
L18QOS Obs., 1 in MPEC 2018-B113 -- 2018 BT1
L04ROASTERR-1 in Romania, 6 in MPEC 2018-B113 -- 2018 BU1, 2018 BH3, 2018 AQ2, 2018 AJ, 2017 QL33, 2016 AU8
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-B113 -- 2018 AQ2
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-B113 -- 2018 BU1
G40(program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-B113 -- 2018 BH3
587Sormano Obs. in Italy, 1 in MPEC 2018-B113 -- 2018 AQ2
691Spacewatch 0.9m telescope in Arizona, 15 in MPEC 2018-B113 -- 2018 BZ2, 2018 BY2, 2018 BQ, 2018 BP, 2018 BL1, 2018 BK1, 2018 AX, 2018 AG2, 2018 AF13, 2018 AE4, 2018 AB12, 2017 YR3, 2017 YF7, 2011 EB7, 2009 EV
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2018-B113 -- 2018 BH1, 2018 AV2, 2018 AK2, 2017 YO6, 2017 YC7, 2017 SN14, 2014 WG365
I52Steward Obs. Mt. Lemmon Station in Arizona, 20 in MPECs 2018-B112 & 2018-B113 -- 2018 BX1, 2018 BV1, 2018 BT1, 2018 BQ, 2018 BP, 2018 BH3, 2018 BG3, 2018 BC3, 2018 BA3, 2018 AV2, 2018 AL12, 2018 AJ2, 2018 AJ, 2018 AF4, 2018 AE4, 2018 AE2, 2018 AD4, 2015 NJ3, 2008 OC9, 2003 UO12
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2018-B113 -- 2018 AJ12, 2018 AE4, 2018 AB12
L01Visnjan Obs., 1 in MPEC 2018-B112 -- 2008 OC9
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 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 BP3NEODyS1640211523.23e-06-7.68-7.860NEODyS: "Based on 29 optical observations (of which 1 are rejected as outliers) from 2018-01-22.361 to 2018-01-23.368."
2018 BL1NEODyS1640210811.83e-08-7.03-7.030NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2018-01-16.417 to 2018-01-23.503."
2018 BPJPL Sentry17322052-206854.4339e-08-5.25-5.720JPL: Computed at 08:39 today Pacific time based on 64 observations spanning 7.9517 days (2018-Jan-16.15431 to 2018-Jan-24.10603). Diameter approximately 0.260 km. from weighted mean H=20.55.
NEODyS16402054-205631.14e-08-5.81-6.00NEODyS: "Based on 57 optical observations (of which 2 are rejected as outliers) from 2018-01-16.155 to 2018-01-23.165."
2018 AL12NEODyS1732R E M O V E D-
2018 AB12NEODyS16402095-211725.45e-09-8.30-8.330NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2018-01-14.378 to 2018-01-23.441."
2018 AE2NEODyS1732R E M O V E D-
JPL Sentry1640R E M O V E DJPL: Risk listing removed at 1553 UTC today
2010 XCJPL Sentry16402018-21113292.9999066e-06-7.27-7.910JPL: Computed at 07:23 April 7th of 2017 Pacific time based on 8 observations spanning .05836 days (2010-Dec-01.30659 to 2010-Dec-01.36495). Diameter approximately 0.005 km. from weighted mean H=29.11.

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 24 January '18

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

2105Grabbed MPEC 2018-B114 - 2018 BK1 = 2011 AM52 - see above
1842Generated Traffic Report
1732Noted that NEODyS has removed 2018 AE2 as an impact risk - see above
Noted that NEODyS has removed 2018 AL12 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 BP risk assessment - see above
Noted that NEODyS has posted 2018 BP3 as an impact risk - see above
1640Noted that JPL Sentry has updated its 2010 XC risk assessment - see above
Noted that NEODyS has updated its 2018 AB12 risk assessment - see above
Noted that JPL Sentry has removed 2018 AE2 as an impact risk - see above
Noted that NEODyS has updated its 2018 BL1 risk assessment - see above
Noted that NEODyS has updated its 2018 BP risk assessment - see above
Grabbed MPEC 2018-B113 - Daily Orbit Update - see above
0635Noted Radar Astrometry database update - see above
0530Grabbed MPEC 2018-B112 - 2008 OC9 - see above