Contents  on 9 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 9 January '18

No objects reported inside ten LD

No asteroids have yet been confirmed to be moving within ten lunar distances (LD) of Earth today. Next known to be coming our way is 2018 AJ, which arrives inside ten LD on or about January 16th.

This report was generated at 1812 UTC with follow-up in today's DOU MPEC for departed intruder 2018 AH and distant 208023 1999 AQ10.

Reading:  A news release today tells that a meteorite "pebble" named Hypatia is "completely different from ... known types of meteorites" and appears to have formed before the Solar System and maybe outside the nebula from which the Sun and Earth were born. Clues include inclusions of pure aluminum crystals and lack of silicate minerals (abstract)."

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. "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 presently so close. 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 9 January '18

The MPC's NEO Confirmation Page has 32 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 32 objects listed. Of these, fifteen were "one nighters." So far The Tracking News has counted a total of 53 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 9 January '18

Minor Planet Electronic Circulars

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

MPEC 2018-A37 - "18:32 UT" - 2018 AX

MPEC 2018-A36 - "17:50 UT" - 2018 AZ

MPEC 2018-A35 - "17:46 UT" - 2018 AY

MPEC 2018-A34 - "17:42 UT" - 2018 AW

MPEC 2018-A33 - "17:38 UT" - 2018 AV

MPEC 2018-A32 - "17:34 UT" - 2018 AU

MPEC 2018-A31 - "17:31 UT" - 2018 AT

<< DOU on 9 Jan. '18 >>  MPEC 2018-A30 - "13:03 UT" - Daily Orbit Update

Observers  on 9 January '18

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2018-A31, 2018-A32, 2018-A33, 2018-A34 & 2018-A37 -- 2018 AX, 2018 AW, 2018 AV, 2018 AU, 2018 AT
T08ATLAS Mauna Loa in Hawaii, 22 in MPEC 2018-A30 -- 2016 AU8, 2015 YR1, 1999 AF4, 88188, 504928, 444193, 438430, 374851, 348314, 302311, 228587, 21374, 208023, 17511, 163696, 154347, 137062, 12711, 111253, 11066, 6053, 3122
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2018-A30 -- 2018 AH, 2007 AT2, 348314, 17511, 6053, 1864
K88GINOP-KHK in Hungary, 4 in MPECs 2018-A34, 2018-A35, 2018-A36 & 2018-A37 -- 2018 AZ, 2018 AY, 2018 AX, 2018 AW
J95Great Shefford Obs. in England, 4 in MPECs 2018-A30, 2018-A34, 2018-A35 & 2018-A37 -- 2018 AY, 2018 AX, 2018 AW, 326354
B15Inastars Obs. in Germany, 1 in MPEC 2018-A35 -- 2018 AY
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2018-A31 -- 2018 AT
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2018-A31, 2018-A32, 2018-A33, 2018-A34 & 2018-A37 -- 2018 AX, 2018 AW, 2018 AV, 2018 AU, 2018 AT
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2018-A30, 2018-A31, 2018-A34 & 2018-A35 -- 2018 AY, 2018 AW, 2018 AT, 2017 YP4, 2007 AT2, 1999 AF4, 504928, 242216, 22771, 202435
Z80Northolt Branch Obs. in England, 3 in MPEC 2018-A30 -- 1999 AF4, 154347, 6053
F51Pan-STARRS 1 (PS1) in Hawaii, 15 in MPECs 2018-A30, 2018-A32, 2018-A33, 2018-A34, 2018-A36 & 2018-A37 -- 2018 AZ, 2018 AX, 2018 AW, 2018 AV, 2018 AU, 2017 SO17, 2017 SL2, 2017 PS30, 2009 WZ7, 85839, 459386, 326354, 244977, 238063, 137924
L04ROASTERR-1 in Romania, 2 in MPECs 2018-A30 & 2018-A35 -- 2018 AY, 504928
H36Sandlot Obs. in Kansas, 4 in MPECs 2018-A30, 2018-A34, 2018-A35 & 2018-A37 -- 2018 AY, 2018 AX, 2018 AW, 326354
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-A30 -- 2004 BB
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2018-A37 -- 2018 AX
I52Steward Obs. Mt. Lemmon Station in Arizona, 6 in MPECs 2018-A30, 2018-A31, 2018-A32, 2018-A34, 2018-A35 & 2018-A37 -- 2018 AY, 2018 AX, 2018 AW, 2018 AU, 2018 AT, 2017 YZ1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 January '18

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 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.





Notes for Today's Latest Risk Assessments
2018 AYJPL Sentry20122099-209911.547e-08-7.18-7.180JPL: Computed at 11:50 today Pacific time based on 37 observations spanning 2.1096 days (2018-Jan-07.23245 to 2018-Jan-09.34204). Diameter approximately 0.085 km. from weighted mean H=23.01.
2018 ATJPL Sentry19002028-203936.515e-10-6.75-6.940JPL: Computed at 10:54 today Pacific time based on 24 observations spanning 3.1537 days (2018-Jan-05.10109 to 2018-Jan-08.25478). Diameter approximately 0.230 km. from weighted mean H=20.83.
2010 JA43JPL Sentry19002019-21171078.94648000000001e-08-4.87-5.290JPL: Computed at 22:17 April 7th of 2017 Pacific time based on 21 observations spanning 2.7122 days (2010-May-04.53905 to 2010-May-07.25122). Diameter approximately 0.161 km. from weighted mean H=21.61.
2010 GZ60JPL Sentry19002018-21164755.3889798e-06-0.90-1.980JPL: Computed at 13:26 April 18th of 2017 Pacific time based on 14 observations spanning 1.2571 days (2010-Apr-05.71913 to 2010-Apr-06.97621). Diameter approximately 2.000 km. from weighted mean H=16.14.

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 9 January '18

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

2012Noted that JPL Sentry has posted 2018 AY as an impact risk - see above
1900Noted that JPL Sentry has updated its 2010 GZ60 risk assessment - see above
Noted that JPL Sentry has updated its 2010 JA43 risk assessment - see above
Noted that JPL Sentry has posted 2018 AT as an impact risk - see above
1835Grabbed MPEC 2018-A37 - 2018 AX - see above
1812Generated Traffic Report
1800Grabbed MPEC 2018-A31 - 2018 AT - see above
Grabbed MPEC 2018-A32 - 2018 AU - see above
Grabbed MPEC 2018-A33 - 2018 AV - see above
Grabbed MPEC 2018-A34 - 2018 AW - see above
Grabbed MPEC 2018-A35 - 2018 AY - see above
Grabbed MPEC 2018-A36 - 2018 AZ - see above
1610Grabbed MPEC 2018-A30 - Daily Orbit Update - see above