Contents  on 4 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 4 January '19

Ten objects reported inside ten LD

There are ten visitors reported to be less than ten lunar distances (LD) from our planet today. Nearest is risk-listed 2019 AB, which passes us at 1.43 LD and buzzes the Moon at 0.96 LD.

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
0.51 LD Dec. 28 2018 YO2 4 m  5.93 to 6.79 LD Dec. 16 - Jan. 8 intruder, NHATS target, risk - DOU
1.43 LD today 2019 AB 19 m  1.43 LD Dec. 30 - Jan. 8 Moon buzzer, Earth closest at 1118 UTC,
Moon closest 0.96 LD at 2208 UTC, risk
3.0   LD Jan. 10* 2019 AD 10 m  7.4 from 8.5 LD Jan. 2 - 18 EPU +/- 1.15 hours*, NHATS target
3.92 LD Dec. 2 2018 TG6 12 m  9.75 to 9.98 LD Oct. 30 - tomorrow NHATS target
5.60 LD Jan. 12 2018 YU2 17 m  9.27 from 10.12 LD today - Jan. 20 NHATS target, enters ten LD
7.3   LD Jan. 9* 2013 YM2 19 m  8.6 from 9.1 LD Jan. 2 - 16 EPU +/- 3.75 days*, NHATS target
7.47 LD Jan. 10 2018 YQ2 20 m  9.80 from 10.67 LD today - Jan. 15 NHATS target, enters ten LD, risk
7.8   LD tomorrow* 2019 AU 16 m  7.8 from 7.9 LD Dec. 27 - Jan. 14 NEW, EPU +/- 51 mins.* - MPEC
7.8   LD Jan. 6* 2018 XO4 30 m  8.0 from 8.3 LD Dec. 30 - Jan. 13 EPU +/- 17 mins.*, NHATS target
9.05 LD tomorrow 2018 YR2 17 m  9.06 from 9.17 LD Jan. 1 - 8 NHATS target
* EPU = Earth passage uncertainty

This report was generated at 2311 UTC with the discovery of outbound 2019 AU (MPEC) and of already departed 2019 AT (MPEC), which passed Earth at about 7.7 LD* on December 22nd. Today's DOU MPEC has follow-up for risk-listed outbound intruder 2018 YO2 and for five departed objects: 2018 YY2, 2018 YA1, 2018 XN5, and including risk-listed 2018 XA and 2018 VO9, plus astrometry from November for 2018 VK and 2018 UB3.



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. "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.

Radar Astrometry  on 4 January '19

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 2358 UTC when the database was dated 4 Jan.



Photometry and some astrometry is needed for upcoming radar targets. See Arecibo and Goldstone schedules.

NEOCP Activity  on 4 January '19

The MPC's NEO Confirmation Page has 132 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 132 objects listed. Of these, 69 were "one nighters." So far The Tracking News has counted a total of 152 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 4 January '19

Minor Planet Electronic Circulars

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


MPEC 2019-A46 - "22:55 UT" - 2015 LB40


MPEC 2019-A45 - "19:12 UT" - 2014 YM44


MPEC 2019-A44 - "18:42 UT" - 2016 JN17


MPEC 2019-A43 - "16:32 UT" - 2019 AS


MPEC 2019-A42 - "16:27 UT" - 2019 AU


MPEC 2019-A41 - "16:22 UT" - 2019 AT


MPEC 2019-A40 - "16:19 UT" - 2019 AR


MPEC 2019-A39 - "16:14 UT" - 2019 AQ


MPEC 2019-A38 - "16:10 UT" - 2019 AP


MPEC 2019-A37 - "16:05 UT" - 2019 AO


MPEC 2019-A36 - "15:59 UT" - 2019 AN


MPEC 2019-A35 - "15:54 UT" - 2019 AM


<< DOU on 4 Jan. '19 >>  MPEC 2019-A34 - "13:06 UT" - Daily Orbit Update


MPEC 2019-A33 - "11:45 UT" - 2018 PL23


MPEC 2019-A32 - "11:43 UT" - 2018 LO5


MPEC 2019-A31 - "11:34 UT" - 2019 AL

Observers  on 4 January '19

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2019-A36, 2019-A44 & 2019-A45 -- 2019 AN, 2016 JN17, 2014 YM44
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2019-A34 -- 2018 WR1, 2018 UZ, 2007 NL1
T08ATLAS Mauna Loa in Hawaii, 3 in MPEC 2019-A34 -- 2018 VZ9, 2018 TC3, 2013 VD13
V03Big Water Obs. in Utah, 2 in MPEC 2019-A34 -- 2018 VA10, 453729
160Castelmartini Obs. in Italy, 12 in MPEC 2019-A34 -- 99799, 450238, 345722, 325395, 31210, 275611, 242147, 18109, 141498, 137802, 4401, 3200
703Catalina Sky Survey (CSS) in Arizona, 5 in MPEC 2019-A34 -- 2018 VV, 2018 VB1, 2018 UQ2, 2018 RL, 2018 PE22
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2019-A31, 2019-A37, 2019-A38, 2019-A39 & 2019-A46 -- 2019 AQ, 2019 AP, 2019 AO, 2019 AL, 2015 LB40
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2019-A42 -- 2019 AU
K88GINOP-KHK in Hungary, 1 in MPEC 2019-A42 -- 2019 AU
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 475534
Z21LCO Tenerife Aqawan A#1 in the Canary Islands, 1 in MPEC 2019-A34 -- 2004 XP14
568^R. Wainscoat on Mauna Kea in Hawaii, 6 in MPECs 2019-A31, 2019-A36, 2019-A38, 2019-A40, 2019-A41 & 2019-A43 -- 2019 AT, 2019 AS, 2019 AR, 2019 AP, 2019 AN, 2019 AL
474Mt. John Obs. in New Zealand, 1 in MPEC 2019-A42 -- 2019 AU
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPEC 2019-A34 -- 2018 YA3, 2018 VK, 2018 VH1, 2018 UQ2, 2018 UB3, 2018 TX4, 2018 TS5, 2018 TC6, 2018 RU5, 2018 LQ15
F51Pan-STARRS 1 (PS1) in Hawaii, 33 in MPECs 2019-A31, 2019-A32, 2019-A33, 2019-A34, 2019-A35, 2019-A36, 2019-A37, 2019-A38, 2019-A39, 2019-A40, 2019-A41, 2019-A42, 2019-A43 & 2019-A45 -- 2019 AU, 2019 AT, 2019 AS, 2019 AR, 2019 AQ, 2019 AP, 2019 AO, 2019 AN, 2019 AM, 2019 AL, 2018 YZ, 2018 YY2, 2018 XW5, 2018 XU2, 2018 XN, 2018 XD2, 2018 WR1, 2018 WH2, 2018 PL23, 2018 LO5, 2016 BX14, 2014 YM44, 2011 XA3, 2010 OC101, 2009 SV17, 2006 BE55, 2005 YY36, 90403, 454101, 446938, 382825, 329390, 171819
C95SATINO-1 in France, 1 in MPEC 2019-A34 -- 6178
204Schiaparelli Obs. in Italy, 2 in MPECs 2019-A35 & 2019-A42 -- 2019 AU, 2019 AM
033Schwarzschild Obs. in Germany, 1 in MPEC 2019-A43 -- 2019 AS
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-A34 -- 2018 XC2
G40'program code "'" (16) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-A34 -- 5879
291Spacewatch 1.8m telescope in Arizona, 15 in MPECs 2019-A34, 2019-A35, 2019-A36, 2019-A40 & 2019-A43 -- 2019 AS, 2019 AR, 2019 AN, 2019 AM, 2018 YA1, 2018 XE5, 2018 XB4, 2018 WU1, 2018 WP2, 2018 VT3, 2018 UA1, 2018 SX2, 2018 SA3, 2018 RP8, 2018 PT21
C57TESS in Earth orbit, 3 in MPEC 2019-A34 -- 89959, 137062, 6569
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 6 in MPEC 2019-A34 -- 2018 YZ1, 2018 YW2, 2018 YO2, 2018 XN5, 2018 XA, 2018 VO9
L01Visnjan Obs., 3 in MPECs 2019-A35, 2019-A37 & 2019-A39 -- 2019 AQ, 2019 AO, 2019 AM
718Wiggins Obs. in Utah, 1 in MPEC 2019-A34 -- 2018 XR
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 ABNEODyS17402073-211383.67e-06-6.35-6.450NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2019-01-01.272 to 2019-01-03.756."
2018 YW2JPL Sentry17402050-208132.1527e-06-5.28-5.650JPL: Computed at 07:57 today Pacific time based on 15 observations spanning 3.0801 days (2018-Dec-31.52399 to 2019-Jan-03.60408). Diameter approximately 0.054 km. from weighted mean H=23.98.
NEODyS17402050-210174.73e-06-4.85-4.960NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2018-12-31.525 to 2019-01-03.605."
2018 YO2JPL Sentry1740R E M O V E DJPL: Risk listing removed at 1555 UTC today
NEODyS17402066-211442.12e-08-10.37-10.630NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2018-12-29.447 to 2019-01-03.558."
2018 YZ1NEODyS1740R E M O V E D-
2018 XN5JPL Sentry1740R E M O V E DJPL: Risk listing removed at 1547 UTC today
NEODyS1740R E M O V E D-
2018 XB4JPL Sentry17402052-2118417.42222075e-05-3.94-4.070JPL: Computed at 07:55 today Pacific time based on 41 observations spanning 21.920 days (2018-Dec-13.34358 to 2019-Jan-04.26358). Diameter approximately 0.054 km. from weighted mean H=23.97.
NEODyS17402052-2118647.45e-05-3.95-4.1-NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2018-12-13.344 to 2019-01-04.264."
2018 XAJPL Sentry1740R E M O V E DJPL: Risk listing removed at 1542 UTC today
NEODyS1740R E M O V E D-
2018 VO9JPL Sentry1740R E M O V E DJPL: Risk listing removed at 1543 UTC today
NEODyS1740R E M O V E D-

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 4 January '19

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

2358Noted Radar Astrometry database update - see above
2311Generated Traffic Report
2259Grabbed MPEC 2019-A46 - 2015 LB40 - see above
1950Grabbed MPEC 2019-A45 - 2014 YM44 - see above
1905Grabbed MPEC 2019-A44 - 2016 JN17 - see above
1740Noted that JPL Sentry has removed 2018 VO9 as an impact risk - see above
Noted that NEODyS has removed 2018 VO9 as an impact risk - see above
Noted that JPL Sentry has removed 2018 XA as an impact risk - see above
Noted that NEODyS has removed 2018 XA as an impact risk - see above
Noted that JPL Sentry has updated its 2018 XB4 risk assessment - see above
Noted that NEODyS has updated its 2018 XB4 risk assessment - see above
Noted that JPL Sentry has removed 2018 XN5 as an impact risk - see above
Noted that NEODyS has removed 2018 XN5 as an impact risk - see above
Noted that JPL Sentry has removed 2018 YO2 as an impact risk - see above
Noted that NEODyS has updated its 2018 YO2 risk assessment - see above
Noted 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 NEODyS has removed 2018 YZ1 as an impact risk - see above
Noted that NEODyS has posted 2019 AB as an impact risk - see above
Grabbed MPEC 2019-A31 - 2019 AL - see above
Grabbed MPEC 2019-A32 - 2018 LO5 - see above
Grabbed MPEC 2019-A33 - 2018 PL23 - see above
Grabbed MPEC 2019-A34 - Daily Orbit Update - see above
Grabbed MPEC 2019-A35 - 2019 AM - see above
Grabbed MPEC 2019-A36 - 2019 AN - see above
Grabbed MPEC 2019-A37 - 2019 AO - see above
Grabbed MPEC 2019-A38 - 2019 AP - see above
Grabbed MPEC 2019-A39 - 2019 AQ - see above
Grabbed MPEC 2019-A40 - 2019 AR - see above
Grabbed MPEC 2019-A41 - 2019 AT - see above
Grabbed MPEC 2019-A42 - 2019 AU - see above
Grabbed MPEC 2019-A43 - 2019 AS - see above