Contents  on 11 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 11 January '18

No objects reported inside ten LD

Yes, we have no minor planets to talk about today. At least none within ten lunar distances (LD) of Earth. 2018 AJ will enter the ten-LD space next week.

This report was generated at 1850 UTC with the recovery of distant 207398 2006 AS2 in today's DOU MPEC along with follow-up for departed objects 2017 VT14 and intruder 2018 AH, and for distant 208023 1999 AQ10.

Reading:  NASA/Goddard has a news item about observing "a dramatic spindown" of the relatively small nucleus of 41P/Tuttle-Giacobini-Kresak (1951 H1), and noting that such changes in rotation might help explain this comet's strong outbursts in past years (related abstract). And, speaking of comets, it was noted on the Comets Mailing List today that Thomas Bopp, co-discoverer of C/1995 O1 (Hale-Bopp), has passed.

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 objects that have approached Earth within ten LD since A/CC began these traffic reports eleven years ago but are not currently coming 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 11 January '18

The MPC's NEO Confirmation Page has 49 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 49 objects listed. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 62 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 11 January '18

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 2018-A43 - "19:01 UT" - Comet C/2018 A1 (Panstarrs)

MPEC 2018-A42 - "18:46 UT" - Comet P/2017 Y3 (Leonard)

MPEC 2018-A41 - "18:04 UT" - 2018 AG1

MPEC 2018-A40 - "17:56 UT" - 2018 AF1

<< DOU on 11 Jan. '18 >>  MPEC 2018-A39 - "13:04 UT" - Daily Orbit Update

Observers  on 11 January '18

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

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 22 in MPEC 2018-A39 -- 2018 AH, 2017 YP4, 96590, 88188, 504928, 475967, 348314, 307493, 302311, 281365, 208023, 17511, 163696, 154555, 154347, 137062, 12711, 111253, 6053, 3122, 1864, 1580
T08ATLAS Mauna Loa in Hawaii, 14 in MPEC 2018-A39 -- 2017 YR1, 2017 YN3, 2016 CL32, 2015 FO124, 2007 AG, 2006 OC5, 496818, 495848, 333888, 265187, 259802, 142040, 11405, 1627
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2018-A39 -- 141484
K88GINOP-KHK in Hungary, 2 in MPECs 2018-A41 & 2018-A43 -- 2018 AG1, C/2018 A1
J95Great Shefford Obs. in England, 1 in MPEC 2018-A43 -- C/2018 A1
B15Inastars Obs. in Germany, 1 in MPEC 2018-A41 -- 2018 AG1
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-A42 -- P/2017 Y3
585Kiev Comet Station in Ukraine, 1 in MPEC 2018-A42 -- P/2017 Y3
Z22MASTER IAC Obs. in the Canary Islands, 2 in MPEC 2018-A39 -- 11405, 7889
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2018-A40, 2018-A41 & 2018-A42 -- 2018 AG1, 2018 AF1, P/2017 Y3
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2018-A39 -- 2017 YP4
J69North Obs. in England, 3 in MPEC 2018-A39 -- 1999 AF4, 154347, 6053
F51Pan-STARRS 1 (PS1) in Hawaii, 23 in MPECs 2018-A39, 2018-A40, 2018-A41 & 2018-A43 -- 2018 AX, 2018 AG1, 2018 AF1, C/2018 A1, 2017 VT14, 2017 UZ4, 2016 AR130, 2015 OH, 2014 XG8, 2013 XF22, 2012 BV26, 2010 SA12, 2006 OD7, 496818, 326777, 259802, 216985, 207398, 164221, 163691, 154652, 7977, 3671
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2018-A39 -- 2015 BN509, 190208, 162011
L04ROASTERR-1 in Romania, 2 in MPECs 2018-A41 & 2018-A43 -- 2018 AG1, C/2018 A1
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-A43 -- C/2018 A1
033Schwarzschild Obs. in Germany, 3 in MPECs 2018-A40, 2018-A41 & 2018-A43 -- 2018 AG1, 2018 AF1, C/2018 A1
G40(program code "(" (17) via Canary Islands Obs. in the Canary Islands, 3 in MPECs 2018-A40, 2018-A42 & 2018-A43 -- 2018 AF1, C/2018 A1, P/2017 Y3
G409B. Lutkenhoner in Germany via Canary Islands Obs. in the Canary Islands, 2 in MPECs 2018-A42 & 2018-A43 -- C/2018 A1, P/2017 Y3
W885M. Kumrucu-Lohmiller in Massachusetts via Chile Obs. in Chile, 1 in MPEC 2018-A39 -- 2017 SR32
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2018-A39 -- 3122
I52Steward Obs. Mt. Lemmon Station in Arizona, 3 in MPECs 2018-A40, 2018-A41 & 2018-A42 -- 2018 AG1, 2018 AF1, P/2017 Y3
926Tenagra II Obs. in Arizona, 3 in MPECs 2018-A40, 2018-A41 & 2018-A42 -- 2018 AG1, 2018 AF1, P/2017 Y3
L01Visnjan Obs., 1 in MPEC 2018-A40 -- 2018 AF1
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2018-A39 -- 504928, 348314, 111253
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 January '18

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 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
2017 YZ1JPL Sentry17002047-211654.13250927e-05-1.96-1.971JPL: Computed at 07:59 Jan. 9th Pacific time based on 45 observations spanning 20.031 days (2017-Dec-20.42481 to 2018-Jan-09.45623). Diameter approximately 0.260 km. from weighted mean H=20.57.
NEODyS17002047-206121.73e-06-3.35-3.350NEODyS: "Based on 45 optical observations (of which 0 are rejected as outliers) from 2017-12-20.426 to 2018-01-09.457."

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 11 January '18

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

1904Grabbed MPEC 2018-A42 - Comet P/2017 Y3 (Leonard) - see above
Grabbed MPEC 2018-A43 - Comet C/2018 A1 (Panstarrs) - see above
1850Generated Traffic Report
1839Grabbed MPEC 2018-A40 - 2018 AF1 - see above
Grabbed MPEC 2018-A41 - 2018 AG1 - see above
1700Noted that JPL Sentry has updated its 2017 YZ1 risk assessment - see above
Noted that NEODyS has updated its 2017 YZ1 risk assessment - see above
Grabbed MPEC 2018-A39 - Daily Orbit Update - see above