Contents  on 23 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 23 January '19

Five objects reported inside ten LD

There are five small celestial objects reported passing within ten lunar distances (LD) of Earth today. Nearest is 2019 AS11, which comes its closest to our planet on this passage -- 6.95 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
5.7   LD Jan. 26* 2019 AA10 26 m  7.6 from 9.3 LD yesterday - Jan. 29 EPU +/- 6 mins.*
6.95 LD today 2019 AS11 15 m  6.95 LD Jan. 15 - 30 NHATS target, Earth closest at 0027 UTC
7.45 LD Jan. 19 2019 AB5 27 m  8.72 to 9.58 LD Jan. 15 - 24
7.6   LD Jan. 25* 2019 AJ13 8 m  7.7 from 8.1 LD Jan. 20 - 29 EPU +/- 5 mins.*, NHATS target
8.59 LD Jan. 25 2019 AG11 19 m  8.96 from 9.57 LD yesterday - Jan. 28
* EPU = Earth passage uncertainty

This report was generated at 1920 UTC with follow-up in today's DOU MPEC for departed risk-listed 2019 AK12.

9.1   LD Jan. 25* 2019 AN12 28 m  10.4 from 13.2 LD tomorrow - Jan. 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 23 January '19

The MPC's NEO Confirmation Page has 63 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 63 objects listed. Of these, 38 were "one nighters." So far The Tracking News has counted a total of 82 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 23 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.

MPEC 2019-B66 - "20:35 UT" - Comet P/2019 A7 (Panstarrs)

MPEC 2019-B65 - "18:38 UT" - Comet C/2019 B1 (Africano)

<< DOU on 23 Jan. '19 >>  MPEC 2019-B64 - "13:15 UT" - Daily Orbit Update

MPEC 2019-B63 - "11:46 UT" - 2003 AC23

MPEC 2019-B62 - "11:28 UT" - 2019 BQ

Observers  on 23 January '19

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
L2729PREMOTE Obs., 1 in MPEC 2019-B66 -- P/2019 A7
T08ATLAS Mauna Loa in Hawaii, 13 in MPEC 2019-B64 -- 90403, 523631, 523604, 512245, 458122, 457260, 410088, 18736, 152742, 137084, 6178, 5143, 1943
703Catalina Sky Survey in Arizona, 1 in MPEC 2019-B65 -- C/2019 B1
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2019-B66 -- P/2019 A7
J95Great Shefford Obs. in England, 3 in MPECs 2019-B64 & 2019-B65 -- C/2019 B1, 2019 AV2, 2019 AA9
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2019-B66 -- P/2019 A7
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2019-B64 -- 2019 AK12
Z17LCO Tenerife Aqawan A#2 in the Canary Islands, 1 in MPEC 2019-B64 -- 2019 AV2
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2019-B66 -- P/2019 A7
118Modra Obs. in Slovakia, 1 in MPEC 2019-B65 -- C/2019 B1
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2019-B63 -- 2003 AC23
Z80Northolt Branch Obs. in England, 2 in MPEC 2019-B64 -- 2019 AV2, 2016 AZ8
I41Palomar Transient Factory (PTF) in southern California, 8 in MPEC 2019-B64 -- 2009 SV17, 2007 NL1, 410088, 31210, 18109, 10302, 7358, 1863
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2019-B62 & 2019-B66 -- 2019 BQ, P/2019 A7
F52Pan-STARRS 2 (PS2) in Hawaii, 2 in MPECs 2019-B63 & 2019-B64 -- 2003 AC23, 40263
C95SATINO-1 in France, 1 in MPEC 2019-B64 -- 141053
G409B. Lutkenhoner in Germany via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-B66 -- P/2019 A7
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2019-B66 -- P/2019 A7
I52Steward Obs. Mt. Lemmon Station in Arizona, 3 in MPECs 2019-B63, 2019-B65 & 2019-B66 -- C/2019 B1, P/2019 A7, 2003 AC23
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2019-B64 -- 2018 XA5, 2018 PC
L01Visnjan Obs., 1 in MPEC 2019-B66 -- P/2019 A7
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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.





Notes for Today's Latest Risk Assessments
2019 AK12JPL Sentry18002113-211931.0819e-06-7.35-7.690JPL: Computed at 08:07 today Pacific time based on 34 observations spanning 6.8041 days (2019-Jan-14.442192 to 2019-Jan-21.24626). Diameter approximately 0.011 km. from weighted mean H=27.47.

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 23 January '19

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

2232Grabbed MPEC 2019-B66 - Comet P/2019 A7 (Panstarrs) - see above
1920Generated Traffic Report
1905Grabbed MPEC 2019-B65 - Comet C/2019 B1 (Africano) - see above
1800Noted that JPL Sentry has updated its 2019 AK12 risk assessment - see above
Grabbed MPEC 2019-B62 - 2019 BQ - see above
Grabbed MPEC 2019-B63 - 2003 AC23 - see above
Grabbed MPEC 2019-B64 - Daily Orbit Update - see above