Contents  on 17 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 17 January '18

Six objects reported inside ten LD

Today six visitors are known to be less than ten lunar distances (LD) from Earth. Nearest of these is 2018 AG4. Inside Earth's SOI, it comes its closest to our planet this time around, reaching 1.40 LD at 1040 UTC, and also its closest to the Moon -- 2.02 LD at 1954 UTC.

Earth passage I D ~Size Distance today  Inside ten LD Notes
1.16 LD Jan. 14 2018 AS2 6 m  4.47 to 6.14 LD Jan. 8 - 20 NHATS target
1.40 LD today 2018 AG4 22 m  1.40 LD Jan. 12 - 22 NHATS target, Earth closest at 1040 UTC,
Moon closest 2.02 LD at 1954 UTC - DOU
1.83 LD Jan. 11 2018 AT2 10 m  9.77 to 11.36 LD Jan. 4 - 17 exits ten LD, risk - DOU
2.73 LD Jan. 14 2018 AU2 11 m  5.85 to 7.74 LD Jan. 9 - 19
4.65 LD Jan. 23 2018 AJ 37 m  8.32 from 9.39 LD yesterday - Jan. 30 NHATS target
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? - DOU
Approaching (sorted by 10-LD bubble entry date)
3.7   LD Feb. 24* 2017 DR109 10 m  69.4 from 71.7 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 271 m  65.09 from 66.40 LD Feb. 28 - March 13 radar/NHATS target - DOU
6.9   LD March 10* 2015 DK200 26 m  111.7 from 114.6 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
* EPU = Earth passage uncertainty

This report was generated at 1831 UTC with first follow-up for departed objects 2018 AW11 and 2018 AA4 in today's DOU MPEC along with continuing follow-up for approaching 2017 VR12, passing 2018 AG4, outbound objects 2018 AV2 and risk-listed 2018 AT2, departed 2018 AJ3, and distant 208023 1999 AQ10, plus astrometry from November for 2017 VD.

Reading:  The American Meteor Society reports that "a very slow moving meteor," apparently "a fairly big space rock," detonated high above Michigan yesterday evening. The explosion registered as an earthquake. AMS has updated details and more videos here.



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. "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 currently so close. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 17 January '18

The MPC's NEO Confirmation Page has 124 listings

When last checked at 2309 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 124 objects listed. Of these, 58 were "one nighters." The Tracking News counted a total of 130 listings on the NEOCP on this day.

New MPECs  on 17 January '18

Minor Planet Electronic Circulars

There were nineteen MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-B32 - "23:57 UT" - 2018 BA


MPEC 2018-B31 - "23:53 UT" - 2018 AP12


MPEC 2018-B30 - "23:50 UT" - 2018 AO12


MPEC 2018-B29 - "23:46 UT" - 2018 AN12


MPEC 2018-B28 - "23:42 UT" - 2018 AJ12


MPEC 2018-B27 - "23:37 UT" - 2018 AM12


MPEC 2018-B26 - "23:34 UT" - 2018 AL12


MPEC 2018-B25 - "23:30 UT" - 2018 AK12


MPEC 2018-B24 - "23:26 UT" - 2018 AH12


MPEC 2018-B23 - "23:21 UT" - 2018 AG12


MPEC 2018-B22 - "23:18 UT" - 2018 AF12


MPEC 2018-B21 - "23:07 UT" - 2018 AE12


MPEC 2018-B20 - "19:30 UT" - Comet P/2018 A5 (Panstarrs)


MPEC 2018-B19 - "19:12 UT" - Comet P/2018 A4 (Panstarrs)


MPEC 2018-B18 - "18:57 UT" - Comet C/2018 A3 (ATLAS)


MPEC 2018-B17 - "15:34 UT" - 2016 BR80


<< DOU on 17 Jan. '18 >>  MPEC 2018-B16 - "13:06 UT" - Daily Orbit Update


MPEC 2018-B15 - "02:09 UT" - 2016 SA


MPEC 2018-B14 - "00:17 UT" - Comet P/2013 CU129 = 2018 A2 (Panstarrs)

Observers  on 17 January '18

A total of 36 observers appeared in this day's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-B27 -- 2018 AM12
T05ATLAS Haleakala in Hawaii, 22 in MPEC 2018-B16 -- 2017 YR1, 2015 BS509, 2009 BM2, 2007 AG, 2004 BB, 85990, 505667, 411201, 385580, 333888, 265187, 259802, 164121, 142040, 138013, 100926, 8567, 7977, 6050, 2329, 2202, 1980
T08ATLAS Mauna Loa in Hawaii, 26 in MPECs 2018-B16 & 2018-B18 -- C/2018 A3, 2017 YP4, 2017 YN3, 2017 YC2, 2017 VR12, 2016 AU8, 96590, 88188, 504928, 374851, 36284, 348314, 281365, 208023, 17511, 163696, 154347, 137924, 137078, 137052, 12711, 111253, 6053, 3122, 1864, 1580
Z84Calar Alto Schmidt in Spain, 2 in MPECs 2018-B14 & 2018-B27 -- 2018 AM12, P/2018 A2
160Castelmartini Obs. in Italy, 5 in MPEC 2018-B16 -- 2009 QL8, 85628, 1981, 1866, 1627
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2018-B16, 2018-B18 & 2018-B29 -- 2018 AN12, C/2018 A3, 2003 UO12
K51Celado Obs. in Italy, 1 in MPEC 2018-B19 -- P/2018 A4
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPECs 2018-B16, 2018-B24 & 2018-B27 -- 2018 AV2, 2018 AM12, 2018 AH12, 2017 YZ5, 2017 YZ1, 2017 YA8, 2017 XJ2, 2017 XF62, 2017 MA4
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 6 in MPECs 2018-B15, 2018-B16, 2018-B27 & 2018-B28 -- 2018 AT2, 2018 AM12, 2018 AJ12, 2018 AE2, 2017 XJ61, 2016 SA
734Farpoint Obs. in Kansas, 2 in MPECs 2018-B23 & 2018-B32 -- 2018 BA, 2018 AG12
U695Hidetaka Sato in Japan via iTelescope Obs. Auberry in northern California, 1 in MPEC 2018-B18 -- C/2018 A3
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-B18 -- C/2018 A3
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 2 in MPECs 2018-B19 & 2018-B20 -- P/2018 A5, P/2018 A4
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-B29 -- 2018 AN12
844Los Molinos Obs. in Uruguay, 1 in MPEC 2018-B16 -- 190208
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2018-B21, 2018-B22, 2018-B23, 2018-B24 & 2018-B32 -- 2018 BA, 2018 AH12, 2018 AG12, 2018 AF12, 2018 AE12
568_Marco Micheli on Mauna Kea in Hawaii, 9 in MPECs 2018-B16, 2018-B19, 2018-B20, 2018-B24, 2018-B25, 2018-B26, 2018-B27 & 2018-B30 -- 2018 AO12, 2018 AM12, 2018 AL12, 2018 AK12, 2018 AH12, 2018 AF4, 2018 AD12, P/2018 A5, P/2018 A4
711McDonald Obs. in Texas, 5 in MPECs 2018-B18, 2018-B19, 2018-B20, 2018-B22 & 2018-B28 -- 2018 AJ12, 2018 AF12, P/2018 A5, P/2018 A4, C/2018 A3
G96Mt. Lemmon Survey (MLS) in Arizona, 22 in MPECs 2018-B14, 2018-B16, 2018-B18, 2018-B21, 2018-B22, 2018-B23, 2018-B28 & 2018-B32 -- 2018 BA, 2018 AV2, 2018 AJ12, 2018 AG12, 2018 AF12, 2018 AE12, C/2018 A3, P/2018 A2, 87024, 65690, 53430, 53319, 504887, 440212, 363734, 348595, 326777, 220839, 159467, 141670, 6611, 2201
F51Pan-STARRS 1 (PS1) in Hawaii, 37 in MPECs 2018-B16, 2018-B18, 2018-B19, 2018-B20, 2018-B22, 2018-B24, 2018-B25, 2018-B26, 2018-B27, 2018-B28, 2018-B29, 2018-B30 & 2018-B31 -- 2018 AV2, 2018 AP12, 2018 AO12, 2018 AN12, 2018 AM3, 2018 AM12, 2018 AL12, 2018 AK3, 2018 AK12, 2018 AJ12, 2018 AH12, 2018 AF12, P/2018 A5, P/2018 A4, C/2018 A3, 2015 DE198, 2015 BW510, 2014 GE53, 2012 PC20, 2011 HJ61, 2009 QD34, 2004 QC17, 68278, 499496, 444628, 434188, 40329, 380160, 259802, 258325, 246138, 228368, 16834, 162979, 153243, 141593, 5620
K63Pascoli Obs. in Italy, 1 in MPEC 2018-B29 -- 2018 AN12
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2018-B16 -- 2017 SO17, 190208, 143992, 137052
L04ROASTERR-1 in Romania, 1 in MPEC 2018-B16 -- 2017 YP4
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-B18 -- C/2018 A3
C95SATINO-1 in France, 1 in MPEC 2018-B16 -- 2017 VD
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-B18 -- C/2018 A3
033Schwarzschild Obs. in Germany, 8 in MPECs 2018-B16, 2018-B18, 2018-B20, 2018-B21, 2018-B29 & 2018-B32 -- 2018 BA, 2018 AW11, 2018 AV11, 2018 AN12, 2018 AE12, 2018 AA12, P/2018 A5, C/2018 A3
645Sloan Digital Sky Survey (SDSS) in New Mexico, 3 in MPEC 2018-B16 -- 2012 US136, 2012 MS4, 2012 ES14
G40(program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-B18 -- C/2018 A3
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPECs 2018-B18 & 2018-B19 -- P/2018 A4, C/2018 A3
691Spacewatch 0.9m telescope in Arizona, 8 in MPECs 2018-B16, 2018-B18, 2018-B19, 2018-B21, 2018-B23, 2018-B27, 2018-B29 & 2018-B31 -- 2018 AP12, 2018 AN12, 2018 AM12, 2018 AK2, 2018 AG12, 2018 AE12, P/2018 A4, C/2018 A3
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2018-B16, 2018-B19, 2018-B26, 2018-B30 & 2018-B31 -- 2018 AV2, 2018 AP12, 2018 AO12, 2018 AL12, 2018 AG4, P/2018 A4
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2018-B16 -- 3122
I52Steward Obs. Mt. Lemmon Station in Arizona, 20 in MPECs 2018-B16, 2018-B19, 2018-B21, 2018-B22, 2018-B23, 2018-B25, 2018-B26, 2018-B27, 2018-B28, 2018-B29 & 2018-B32 -- 2018 BA, 2018 AX3, 2018 AN2, 2018 AN12, 2018 AM12, 2018 AL3, 2018 AL12, 2018 AK3, 2018 AK12, 2018 AJ3, 2018 AJ12, 2018 AG12, 2018 AF12, 2018 AF1, 2018 AE12, 2018 AD4, 2018 AA4, P/2018 A4, 2017 YY5, 2017 XG62
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2018-B18 -- C/2018 A3
926Tenagra II Obs. in Arizona, 1 in MPEC 2018-B18 -- C/2018 A3
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 2 in MPECs 2018-B16 & 2018-B17 -- 2018 AT, 2016 BR80
L01Visnjan Obs., 2 in MPECs 2018-B18 & 2018-B32 -- 2018 BA, C/2018 A3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 January '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2309 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 AB12NEODyS16302085-2117167.93e-08-7.25-7.880NEODyS: "Based on 17 optical observations (of which 1 are rejected as outliers) from 2018-01-14.378 to 2018-01-16.326."
2018 AE4NEODyS1630211013.0e-08-7.62-7.620NEODyS: "Based on 24 optical observations (of which 2 are rejected as outliers) from 2018-01-13.463 to 2018-01-15.538."
2018 AT2JPL Sentry16302115-211511.998e-07-8.44-8.440JPL: Computed at 07:59 today Pacific time based on 27 observations spanning 4.7362 days (2018-Jan-12.34078 to 2018-Jan-17.077029). Diameter approximately 0.010 km. from weighted mean H=27.74.
NEODyS1630210311.89e-07-8.44-8.440NEODyS: "Based on 27 optical observations (of which 9 are rejected as outliers) from 2018-01-12.335 to 2018-01-15.505."
2018 AE2JPL Sentry16302094-210672.791114e-07-4.07-4.120JPL: Computed at 07:54 today Pacific time based on 22 observations spanning 11.734 days (2018-Jan-05.48148 to 2018-Jan-17.21553). Diameter approximately 0.339 km. from weighted mean H=19.99.
2018 ATJPL Sentry1630R E M O V E DJPL: Risk listing removed at 1556 UTC today
2017 YV8NEODyS16302067-2113632.33e-05-6.08-6.570NEODyS: "Based on 15 optical observations (of which 3 are rejected as outliers) from 2017-12-25.192 to 2018-01-05.261."
2017 YZ1JPL Sentry16302047-204711.072e-07-4.46-4.460JPL: Computed at 08:00 today Pacific time based on 72 observations spanning 26.836 days (2017-Dec-20.42481 to 2018-Jan-16.26116). Diameter approximately 0.280 km. from weighted mean H=20.38.

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 17 January '18

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

0002 1/18Grabbed MPEC 2018-B21 - 2018 AE12 - see above
Grabbed MPEC 2018-B22 - 2018 AF12 - see above
Grabbed MPEC 2018-B23 - 2018 AG12 - see above
Grabbed MPEC 2018-B24 - 2018 AH12 - see above
Grabbed MPEC 2018-B25 - 2018 AK12 - see above
Grabbed MPEC 2018-B26 - 2018 AL12 - see above
Grabbed MPEC 2018-B27 - 2018 AM12 - see above
Grabbed MPEC 2018-B28 - 2018 AJ12 - see above
Grabbed MPEC 2018-B29 - 2018 AN12 - see above
Grabbed MPEC 2018-B30 - 2018 AO12 - see above
Grabbed MPEC 2018-B31 - 2018 AP12 - see above
Grabbed MPEC 2018-B32 - 2018 BA - see above
1936Grabbed MPEC 2018-B19 - Comet P/2018 A4 (Panstarrs) - see above
Grabbed MPEC 2018-B20 - Comet P/2018 A5 (Panstarrs) - see above
1901Grabbed MPEC 2018-B18 - Comet C/2018 A3 (ATLAS) - see above
1831Generated Traffic Report
1630Noted that NEODyS has posted 2017 YV8 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 YZ1 risk assessment - see above
Noted that NEODyS has posted 2018 AB12 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 AE2 risk assessment - see above
Noted that NEODyS has posted 2018 AE4 as an impact risk - see above
Noted that JPL Sentry has removed 2018 AT as an impact risk - see above
Noted that JPL Sentry has updated its 2018 AT2 risk assessment - see above
Noted that NEODyS has updated its 2018 AT2 risk assessment - see above
Grabbed MPEC 2018-B16 - Daily Orbit Update - see above
Grabbed MPEC 2018-B17 - 2016 BR80 - see above
0512Grabbed MPEC 2018-B15 - 2016 SA - see above
0058Grabbed MPEC 2018-B14 - Comet P/2013 CU129 = 2018 A2 (Panstarrs) - see above