Contents  on 12 February '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 12 February '19

Five objects reported inside ten LD

Five transient natural objects are reported less than ten lunar distances (LD) from our home world today. Nearest are 2019 CN2, which exits Earth's sphere of gravitational influence (SOI) as it travels outward from 1.75 to 3.09 LD, and 2019 CG4, also in the SOI, coming its closest to our world on this passage, reaching 1.78 LD at 1154 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
1.47 LD yesterday 2019 CN2 8 m  1.75 to 3.09 LD Feb. 5 - 17 NHATS target, exits Earth SOI
1.78 LD today 2019 CG4 6 m  1.78 LD Feb. 6 - 18 NHATS target, Moon closest 2.70 LD at 1127 UTC, Earth closest at 1154 UTC - DOU
2.72 LD Feb. 10 2019 CB2 22 m  6.30 to 9.03 LD Feb. 6 - 13
7.3   LD today* 2017 PV25 41 m  7.3 LD Feb. 7 - 17 EPU +/- 1.07 hours*, NHATS target, Earth closest at 1241 UTC
8.00 LD today 2019 CY2 15 m  8.00 LD Feb. 10 - 14 Earth closest at 0333 UTC, risk
Approaching - sorted by 10-LD bubble entry date
3.3   LD Feb. 20* 2019 CY1 25 m  22.4 from 25.5 LD Feb. 17 - 23 EPU +/- 6 mins.*, risk - DOU
7.4   LD Feb. 25* 2019 CJ 25 m  15.7 from 16.7 LD Feb. 19 - March 3 EPU +/- 24 mins.*, NHATS target
6.2   LD March 2* 2019 CT4 49 m  50.4 from 53.2 LD Feb. 28 - March 5 EPU +/- 2.04 days*
* EPU = Earth passage uncertainty

This report was generated at 2035 UTC with radar observation posted yesterday of 1998 SD9 and today of 2019 BJ1, and with optical follow-up in today's DOU MPEC for approaching risk-listed 2019 CY1, passing 2019 CG4, and four departed risk-listed objects: 2019 CJ4, 2019 BE5, 2019 BU1, and 2019 BZ.



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 12 February '19

Radar observation of two objects

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


Data update noted at 0022 UTC when the database was dated 11 Feb.


Data update noted at 2359 UTC when the database was dated 12 Feb.

NEOCP Activity  on 12 February '19

The MPC's NEO Confirmation Page has 56 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 56 objects listed. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 57 listings on the NEOCP today.

New MPECs  on 12 February '19

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 12 Feb. '19 >>  MPEC 2019-C132 - "13:05 UT" - Daily Orbit Update

Observers  on 12 February '19

A total of 20 observers appear in today's MPEC.

CodeObserver / observatory
251Arecibo in Puerto Rico, 2 in radar -- 2019 BJ1, 2013 CW32
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2019-C132 -- 2019 AT4, 2019 AC13, 2016 OP5, 2016 NN39, 2013 DR9, 250162
160Castelmartini Obs. in Italy, 3 in MPEC 2019-C132 -- 89959, 152931, 139359
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPEC 2019-C132 -- 2019 BG, 2019 AZ13, 2019 AV9, 2019 AM10, 2019 AF12, 2019 AA14, 2018 XH, 2018 RW7, 2014 HS178, 2010 SD
W84#program code "#" (12) via DECam in Chile, 1 in MPEC 2019-C132 -- 2018 YW2
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2019-C132 -- 2018 XH
253Goldstone DSS-14 70m antenna in southern California, 2 in radar -- 2019 BJ1, 2013 CW32
J95Great Shefford Obs. in England, 2 in MPEC 2019-C132 -- 2019 CH4, 2019 CG4
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2019-C132 -- 2017 BK
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2019-C132 -- 26166
168Kourovskaya Obs. in Russia, 3 in MPEC 2019-C132 -- 523788, 6053, 3200
Z21LCO Tenerife Aqawan A#1 in the Canary Islands, 1 in MPEC 2019-C132 -- 2019 BF1
Z80Northolt Branch Obs. in England, 1 in MPEC 2019-C132 -- 2012 OP4
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2019-C132 -- 2013 PF67
323Perth Obs. in Western Australia, 3 in MPEC 2019-C132 -- 2019 AW4, 2019 AP3, 2012 OP4
L18QOS Obs., 1 in MPEC 2019-C132 -- 2019 CT1
C95SATINO-1 in France, 1 in MPEC 2019-C132 -- 2012 BN11
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2019-C132 -- 2019 CZ1, 2019 CY1, 2019 CO1, 2019 CJ4, 2003 FF5
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 5 in MPEC 2019-C132 -- 2019 BZ, 2019 BU1, 2019 BE5, 2019 BB5, 2018 YW2
718Wiggins Obs. in Utah, 1 in MPEC 2019-C132 -- 2019 CT1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 February '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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 CJ4JPL Sentry17302063-2116451.67701459e-05-5.05-5.530JPL: Computed at 08:10 today Pacific time based on 37 observations spanning 3.9002 days (2019-Feb-08.36766 to 2019-Feb-12.26791). Diameter approximately 0.030 km. from weighted mean H=25.28.
NEODyS17302063-2118902.34e-05-4.88-5.26-NEODyS: "Based on 37 optical observations (of which 0 are rejected as outliers) from 2019-02-08.368 to 2019-02-12.269."
2019 CZ1JPL Sentry17302114-211414.389e-09-8.02-8.020JPL: Computed at 08:03 today Pacific time based on 27 observations spanning 7.7966 days (2019-Feb-04.42332 to 2019-Feb-12.21991). Diameter approximately 0.046 km. from weighted mean H=24.36.
NEODyS17302046-211541.17e-07-6.58-6.810NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2019-02-04.424 to 2019-02-12.221."
2019 CY1JPL Sentry17302060-206012.908e-09-8.70-8.700JPL: Computed at 08:07 today Pacific time based on 22 observations spanning 7.8717 days (2019-Feb-04.36727 to 2019-Feb-12.23896). Diameter approximately 0.025 km. from weighted mean H=25.63.
NEODyS1730206018.67e-09-8.26-8.260NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2019-02-04.368 to 2019-02-12.240."
2019 CO1NEODyS1730R E M O V E D-
2019 BE5JPL Sentry17302038-2115111.234895e-05-4.61-4.690JPL: Computed at 08:44 today Pacific time based on 76 observations spanning 7.8173 days (2019-Jan-31.324536 to 2019-Feb-08.14183). Diameter approximately 0.033 km. from weighted mean H=25.08.
2019 BB5JPL Sentry1730R E M O V E DJPL: Risk listing removed at 1554 UTC today
NEODyS17302102-211027.5e-08-8.30-8.330NEODyS: "Based on 62 optical observations (of which 0 are rejected as outliers) from 2019-01-30.357 to 2019-02-07.886."
2019 BU1JPL Sentry17302056-206221.9517e-06-6.12-6.160JPL: Computed at 07:40 today Pacific time based on 61 observations spanning 15.102 days (2019-Jan-25.32671 to 2019-Feb-09.42846). Diameter approximately 0.020 km. from weighted mean H=26.16.
NEODyS17302056-206221.18e-06-6.35-6.40NEODyS: "Based on 61 optical observations (of which 1 are rejected as outliers) from 2019-01-25.328 to 2019-02-09.429."
2019 BZJPL Sentry17302077-2119182.6988944e-05-6.04-6.260JPL: Computed at 07:47 today Pacific time based on 36 observations spanning 12.053 days (2019-Jan-24.224468 to 2019-Feb-05.277716). Diameter approximately 0.010 km. from weighted mean H=27.59.
NEODyS17302067-2118341.68e-05-6.29-6.55-NEODyS: "Based on 38 optical observations (of which 3 are rejected as outliers) from 2019-01-24.181 to 2019-02-05.279."
2018 YW2JPL Sentry17302069-206911.887e-07-6.38-6.380JPL: Computed at 07:29 today Pacific time based on 65 observations spanning 37.114 days (2018-Dec-31.52399 to 2019-Feb-06.637603). Diameter approximately 0.054 km. from weighted mean H=24.00.
NEODyS1730206924.57e-08-7.02-7.060NEODyS: "Based on 65 optical observations (of which 0 are rejected as outliers) from 2018-12-31.525 to 2019-02-06.638."

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 12 February '19

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

2359Noted Radar Astrometry database update - see above
2035Generated Traffic Report
1730Noted that JPL Sentry has updated its 2018 YW2 risk assessment - see above
Noted that NEODyS has updated its 2018 YW2 risk assessment - see above
Noted that JPL Sentry has removed 2019 BB5 as an impact risk - see above
Noted that NEODyS has updated its 2019 BB5 risk assessment - see above
Noted that JPL Sentry has updated its 2019 BE5 risk assessment - see above
Noted that JPL Sentry has updated its 2019 BU1 risk assessment - see above
Noted that NEODyS has updated its 2019 BU1 risk assessment - see above
Noted that JPL Sentry has updated its 2019 BZ risk assessment - see above
Noted that NEODyS has updated its 2019 BZ risk assessment - see above
Noted that JPL Sentry has updated its 2019 CJ4 risk assessment - see above
Noted that NEODyS has updated its 2019 CJ4 risk assessment - see above
Noted that NEODyS has removed 2019 CO1 as an impact risk - see above
Noted that JPL Sentry has posted 2019 CY1 as an impact risk - see above
Noted that NEODyS has updated its 2019 CY1 risk assessment - see above
Noted that JPL Sentry has updated its 2019 CZ1 risk assessment - see above
Noted that NEODyS has updated its 2019 CZ1 risk assessment - see above
Grabbed MPEC 2019-C132 - Daily Orbit Update - see above
0022Noted Radar Astrometry database update - see above