Contents  on 20 January '19

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 '19

Nine objects reported inside ten LD

Nine Solar-System small bodies are reported to be less than ten lunar distances (LD) from Earth today. One of the nearest is newly announced risk-listed intruder 2019 BO, which heads outward from 6.57 to 8.23 LD after having passed our planet at 0.18 LD on January 16th.

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
0.18 LD Jan. 16 2019 BO 8 m  6.57 to 8.23 LD Jan. 10 - 22 NEW, intruder, NHATS target, risk - MPEC
3.14 LD Jan. 12 2019 AT13 14 m  9.08 to 10.21 LD Jan. 4 - 20 NHATS target, exits ten LD
3.92 LD Jan. 15 2019 AG7 28 m  7.29 to 8.60 LD Jan. 9 - 22 NHATS target
5.60 LD Jan. 12 2018 YU2 18 m  9.70 to 10.54 LD Jan. 4 - 20 NHATS target, exits ten LD
6.95 LD Jan. 23 2019 AS11 15 m  7.22 from 7.55 LD Jan. 15 - 30 NHATS target
7.45 LD yesterday 2019 AB5 27 m  7.45 to 7.61 LD Jan. 15 - 24
7.6   LD Jan. 25* 2019 AJ13 8 m  9.3 from 10.2 LD today - Jan. 29 EPU +/- 5 mins.*, NHATS target, enters ten LD
7.64 LD Jan. 16 2019 AU9 15 m  8.65 to 9.24 LD Jan. 10 - 22 NHATS target
8.08 LD Jan. 15 2019 AT6 10 m  9.77 to 10.44 LD Jan. 10 - 20 NHATS target, exits ten LD
* EPU = Earth passage uncertainty

This report was generated at 1910 UTC with the discovery of outbound risk-listed intruder 2019 BO (MPEC) and with first follow-up for approaching 2019 AA10 in today's DOU MPEC along with follow-up for departed 2019 AR2 and astrometry (older data) for 136617 1994 CC and 68216 2001 CV26.

Approaching - sorted by 10-LD bubble entry date
8.59 LD Jan. 25 2019 AG11 19 m  11.47 from 12.66 LD Jan. 22 - 28
5.7   LD Jan. 26* 2019 AA10 26 m  13.3 from 15.4 LD Jan. 22 - 29 EPU +/- 6 mins.* - DOU
9.1   LD Jan. 25* 2019 AN12 28 m  20.8 from 25.0 LD Jan. 24 - 25 EPU +/- 18 mins.*



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 '19

The MPC's NEO Confirmation Page has 71 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 71 objects listed. Of these, 38 were "one nighters." So far The Tracking News has counted a total of 79 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 '19

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.


<< DOU on 20 Jan. '19 >>  MPEC 2019-B59 - "13:07 UT" - Daily Orbit Update


MPEC 2019-B58 - "02:18 UT" - 2019 BO


MPEC 2019-B57 - "00:53 UT" - 2019 AA14


MPEC 2019-B56 - "00:49 UT" - 2019 AZ13


MPEC 2019-B55 - "00:45 UT" - 2019 AY13

Observers  on 20 January '19

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 34 in MPEC 2019-B59 -- 2004 XP14, 99799, 68950, 68216, 523779, 518463, 512244, 455550, 454177, 442742, 427643, 33342, 31345, 244670, 231134, 217807, 217796, 21277, 21088, 163902, 159608, 155110, 154652, 140928, 138937, 13553, 12538, 5587, 5143, 4401, 4055, 1916, 1627, 719
T08ATLAS Mauna Loa in Hawaii, 26 in MPECs 2019-B58 & 2019-B59 -- 2019 BO, 2019 AR2, 2018 YJ, 2018 XV, 2018 VZ9, 2016 AZ8, 2009 SV17, 86324, 523631, 523604, 512245, 459462, 450238, 410088, 381677, 31210, 275611, 242147, 20460, 18736, 152931, 137805, 6178, 5131, 4401, 1620
703Catalina Sky Survey (CSS) in Arizona, 60 in MPECs 2019-B58 & 2019-B59 -- 2019 BO, 2019 AC, 2018 XV, 2018 XU6, 2018 VZ9, 2018 VW6, 2018 GX4, 2016 AZ8, 2013 TB80, 2011 OL5, 2003 NW1, 99935, 96590, 86324, 68950, 68216, 68063, 54401, 523824, 523823, 523803, 523628, 523603, 454177, 450238, 427643, 424482, 417581, 414960, 410088, 381564, 31345, 31210, 275611, 265661, 217807, 20790, 20460, 18109, 17274, 16834, 154656, 153243, 152931, 140928, 137925, 137805, 137802, 137032, 7358, 6456, 5332, 5131, 4401, 3691, 3288, 3103, 2212, 1943, 1916
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPEC 2019-B59 -- 2019 AF12, 2016 AU130
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPECs 2019-B55, 2019-B56, 2019-B57, 2019-B58 & 2019-B59 -- 2019 BO, 2019 BL, 2019 BK, 2019 AZ13, 2019 AY13, 2019 AL2, 2019 AJ3, 2019 AA14, 2019 AA10, 2018 UZ
W84%program code "%" (14) via DECam in Chile, 1 in MPEC 2019-B59 -- 2015 HS182
006Fabra Obs. in Spain, 1 in MPEC 2019-B59 -- 523604
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 3 in MPEC 2019-B59 -- 2019 BF, 2019 AW4, 2018 YJ
568^R. Wainscoat on Mauna Kea in Hawaii, 3 in MPECs 2019-B55, 2019-B56 & 2019-B57 -- 2019 AZ13, 2019 AY13, 2019 AA14
474Mt. John Obs. in New Zealand, 1 in MPEC 2019-B57 -- 2019 AA14
G96Mt. Lemmon Survey (MLS) in Arizona, 98 in MPEC 2019-B59 -- 2019 AU3, 2019 AT3, 2019 AR4, 2019 AR3, 2019 AQ9, 2019 AQ5, 2019 AP3, 2019 AO8, 2019 AO10, 2018 YW, 2018 YV, 2018 YJ, 2018 YD3, 2018 YB3, 2018 XV, 2018 XU6, 2018 XU2, 2018 XS3, 2018 XB2, 2018 WN2, 2018 TS, 2016 KE, 2016 CA136, 2015 TT351, 2015 ME54, 2014 AA33, 2013 TB80, 2010 XC11, 2010 MR, 2009 AS, 2006 OH15, 2003 NW1, 2002 XQ90, 99935, 96315, 90403, 90075, 85275, 68063, 66272, 523631, 523604, 523603, 467309, 459462, 458135, 457260, 456618, 453729, 447903, 417419, 40267, 39572, 382825, 381677, 375054, 348776, 333707, 318411, 31210, 310737, 302800, 289315, 285331, 276786, 275611, 255501, 23606, 19764, 18736, 177651, 175114, 168378, 163000, 162741, 162004, 159495, 153243, 144411, 141498, 141053, 139622, 139056, 138937, 137084, 136923, 136617, 13553, 10302, 100085, 8013, 7977, 6178, 5131, 4486, 3200, 2212, 1862
J43Oukaimeden Obs. in Morocco, 3 in MPEC 2019-B59 -- 208617, 170891, 3691
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2019-B55, 2019-B56 & 2019-B57 -- 2019 AZ13, 2019 AY13, 2019 AA14
F52Pan-STARRS 2 (PS2) in Hawaii, 5 in MPEC 2019-B59 -- 2006 CU, 31345, 212359, 138925, 5587
323Perth Obs. in Western Australia, 1 in MPEC 2019-B59 -- 1036
C95SATINO-1 in France, 1 in MPEC 2019-B59 -- 137805
I52Steward Obs. Mt. Lemmon Station in Arizona, 6 in MPECs 2019-B57, 2019-B58 & 2019-B59 -- 2019 BO, 2019 AQ8, 2019 AA14, 2018 YJ, 2018 VY7, 2012 KM45
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-B59 -- 2018 YB1
C51WISE in Earth polar orbit, 2 in MPEC 2019-B59 -- 2010 LM14, 366470
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 January '19

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 and NEODyS listings is 100 years, and both post impact solutions beyond that for some 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
2019 BOJPL Sentry04482055-2094141.06306e-05-6.62-7.240JPL: Computed at 19:30 Jan. 19th Pacific time based on 14 observations spanning 1.9669 days (2019-Jan-17.25468 to 2019-Jan-19.2216). Diameter approximately 0.008 km. from weighted mean H=28.03.
NEODyS04482044-2100361.29e-05-6.54-7.030NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2019-01-17.255 to 2019-01-19.222."
2019 BFNEODyS2250R E M O V E D-
2019 AZ13JPL Sentry04482073-207311.361e-09-6.26-6.260JPL: Computed at 17:56 Jan. 19th Pacific time based on 12 observations spanning 6.7333 days (2019-Jan-12.63436 to 2019-Jan-19.36767). Diameter approximately 0.420 km. from weighted mean H=19.55.
2019 AK12NEODyS04482101-211932.74e-07-7.93-8.01-NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2019-01-14.443 to 2019-01-17.409."
2019 AG12NEODyS0448R E M O V E D-
2019 AC3NEODyS04482091-2118152.85e-05-6.03-6.09-NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2019-01-03.589 to 2019-01-17.464."
2019 AW2NEODyS0448207221.84e-06-5.87-5.870NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2019-01-03.476 to 2019-01-17.404."
2018 YW2NEODyS04482050-210176.1e-08-6.81-7.040NEODyS: "Based on 56 optical observations (of which 0 are rejected as outliers) from 2018-12-31.525 to 2019-01-17.658."
2018 XB4NEODyS04482066-2118589.72e-05-3.84-3.89-NEODyS: "Based on 59 optical observations (of which 0 are rejected as outliers) from 2018-12-13.344 to 2019-01-15.236."
2018 WH1NEODyS04482076-2114245.67e-05-6.44-6.890NEODyS: "Based on 71 optical observations (of which 2 are rejected as outliers) from 2018-11-27.259 to 2018-12-13.325."
2017 FB102NEODyS04482051-210962.87e-07-7.42-7.590NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2017-03-27.259 to 2017-04-02.502."
2015 HS182NEODyS2250R E M O V E D-
JPL Sentry1750R E M O V E DJPL: Risk listing removed at 1553 UTC today

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 '19

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

2250Noted that NEODyS has removed 2015 HS182 as an impact risk - see above
Noted that NEODyS has removed 2019 BF as an impact risk - see above
1910Generated Traffic Report
1750Noted that JPL Sentry has removed 2015 HS182 as an impact risk - see above
Grabbed MPEC 2019-B59 - Daily Orbit Update - see above
0448Noted that NEODyS has updated its 2017 FB102 risk assessment - see above
Noted that NEODyS has updated its 2018 WH1 risk assessment - see above
Noted that NEODyS has updated its 2018 XB4 risk assessment - see above
Noted that NEODyS has updated its 2018 YW2 risk assessment - see above
Noted that NEODyS has updated its 2019 AC3 risk assessment - see above
Noted that NEODyS has removed 2019 AG12 as an impact risk - see above
Noted that NEODyS has updated its 2019 AK12 risk assessment - see above
Noted that NEODyS has updated its 2019 AW2 risk assessment - see above
Noted that JPL Sentry has posted 2019 AZ13 as an impact risk - see above
Noted that JPL Sentry has posted 2019 BO as an impact risk - see above
Noted that NEODyS has posted 2019 BO as an impact risk - see above
Grabbed MPEC 2019-B58 - 2019 BO - see above
0133Grabbed MPEC 2019-B55 - 2019 AY13 - see above
Grabbed MPEC 2019-B56 - 2019 AZ13 - see above
Grabbed MPEC 2019-B57 - 2019 AA14 - see above