Contents  on 27 October '18

NOTE:  These A/CC news pages will update less often for a few days. All discoveries and observing credits will be reported, but we may miss some interim impact risk assessments and undercount NEOCP efforts, and there may be some days without a traffic report for Earth's Busy Neighborhood.

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 27 October '18

Five objects reported inside ten LD

There will be no traffic report today as we have been unable to obtain updated passage data from NASA/JPL Horizons. Click on the above left arrow to see yesterday's report. Today's DOU MPEC has follow-up for 2018 UC2, 2018 UY1, 2018 UE1, 2018 UC, 2018 TG6, 2018 TZ5, 2018 TF3, and 163899 2003 SD220 as well as distant 2015 TB145, 2013 UG1, and 2007 VD12, plus astrometry from earlier this month for 2018 RO5.

The next traffic report was posted October 30th.



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.

NEOCP Activity  on 27 October '18

The MPC's NEO Confirmation Page has 18 listings

When last checked at 2346 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of nineteen listings on the NEOCP today.

New MPECs  on 27 October '18

Minor Planet Electronic Circulars

As of last check at 2342 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 27 Oct. '18 >>  MPEC 2018-U74 - "12:13 UT" - Daily Orbit Update

Observers  on 27 October '18

Nineteen observers appear in today's MPEC.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2018-U74 -- 18109
T05ATLAS Haleakala in Hawaii, 21 in MPEC 2018-U74 -- 65706, 54660, 53789, 523631, 523603, 418929, 25916, 217807, 163899, 162687, 154656, 137062, 137032, 115052, 6569, 4953, 4401, 3552, 1916, 1627, 1620
T08ATLAS Mauna Loa in Hawaii, 19 in MPEC 2018-U74 -- 2013 UG1, 96315, 88263, 65733, 54401, 523604, 523587, 481542, 468481, 455550, 446924, 443923, 17274, 16834, 6456, 5143, 3691, 2061, 1943
160Castelmartini Obs. in Italy, 6 in MPEC 2018-U74 -- 2018 RL, 86324, 414960, 163818, 12711, 1865
703Catalina Sky Survey (CSS) in Arizona, 16 in MPEC 2018-U74 -- 96315, 65733, 65706, 54660, 52387, 523631, 523603, 523587, 481542, 454177, 446924, 443923, 267729, 20790, 5143, 1620
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 10 in MPEC 2018-U74 -- 2018 TW4, 2018 TT, 2018 TQ, 2018 TO6, 2018 SV3, 2018 RW27, 2018 RR8, 2018 PS7, 2018 MW6, 2015 YE21
E89Geyserland Obs. in New Zealand, 4 in MPEC 2018-U74 -- 418929, 25916, 18109, 4953
J95Great Shefford Obs. in England, 3 in MPEC 2018-U74 -- 2018 UM1, 2018 UC, 2018 TG6
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-U74 -- 2018 UC2
Q67JBL Obs., 1 in MPEC 2018-U74 -- 4953
Z80Northolt Branch Obs. in England, 2 in MPEC 2018-U74 -- 2002 VE68, 163899
F52Pan-STARRS 2 (PS2) in Hawaii, 2 in MPEC 2018-U74 -- 162687, 3552
D29Purple Mtn. Obs. Xuyi Station in China, 5 in MPEC 2018-U74 -- 267729, 17511, 152952, 4183, 3552
C95SATINO-1 in France, 1 in MPEC 2018-U74 -- 2009 SV17
L06Sormano2 Obs. in Italy, 1 in MPEC 2018-U74 -- 2018 UC2
691Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2018-U74 -- 2018 UN1, 2018 TS, 2018 TG6, 2018 SK3, 2018 RP8, 2018 LZ5, 2018 FJ4, 2015 TL178, 2013 WR43
291Spacewatch 1.8m telescope in Arizona, 14 in MPEC 2018-U74 -- 2018 UM1, 2018 UH, 2018 TY2, 2018 TY, 2018 TJ6, 2018 TG6, 2018 LK2, 2016 UA, 2016 JG12, 2015 TB145, 2015 MQ101, 2012 MS4, 2007 VD12, 2004 TB10
I52Steward Obs. Mt. Lemmon Station in Arizona, 45 in MPEC 2018-U74 -- 2018 UY1, 2018 UN1, 2018 UM1, 2018 UJ1, 2018 UJ, 2018 UE1, 2018 UC2, 2018 UC, 2018 TZ5, 2018 TY2, 2018 TW, 2018 TS, 2018 TQ1, 2018 TP, 2018 TO2, 2018 TO1, 2018 TL2, 2018 TK2, 2018 TG6, 2018 TF3, 2018 TE3, 2018 TC3, 2018 TA3, 2018 SZ2, 2018 SK3, 2018 SK1, 2018 SB1, 2018 RL, 2018 QP, 2018 PS23, 2018 PL9, 2018 PE22, 2018 NU3, 2018 MW6, 2018 LZ5, 2018 LR15, 2018 KR2, 2018 KG1, 2018 KE3, 2018 FJ4, 2016 TZ56, 2016 TS55, 2015 UH51, 2015 TN237, 2015 OH
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-U74 -- 2018 RO5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 October '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2342 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
2018 UN1JPL Sentry1708R E M O V E DJPL: Risk listing removed at 1514 UTC today
2018 UM1JPL Sentry17082067-2116174.558773e-05-3.95-4.380JPL: Computed at 08:29 today Pacific time based on 64 observations spanning 8.0973 days (2018-Oct-19.1455 to 2018-Oct-27.24281). Diameter approximately 0.073 km. from weighted mean H=23.35.
2018 UHJPL Sentry17082059-205911.453e-09-8.13-8.130JPL: Computed at 08:17 today Pacific time based on 27 observations spanning 10.025 days (2018-Oct-17.33695 to 2018-Oct-27.3621). Diameter approximately 0.058 km. from weighted mean H=23.84.
2018 TJ6JPL Sentry17082106-211891.568888e-06-5.40-5.660JPL: Computed at 08:09 today Pacific time based on 27 observations spanning 11.832 days (2018-Oct-15.51484 to 2018-Oct-27.34654). Diameter approximately 0.067 km. from weighted mean H=23.52.
2018 TG6JPL Sentry17082099-209911.350e-07-8.45-8.450JPL: Computed at 08:07 today Pacific time based on 40 observations spanning 11.937 days (2018-Oct-15.45216 to 2018-Oct-27.38879). Diameter approximately 0.012 km. from weighted mean H=27.33.

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 27 October '18

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

2325Generated Traffic Report
1708Noted that JPL Sentry has updated its 2018 TG6 risk assessment - see above
Noted that JPL Sentry has updated its 2018 TJ6 risk assessment - see above
Noted that JPL Sentry has updated its 2018 UH risk assessment - see above
Noted that JPL Sentry has updated its 2018 UM1 risk assessment - see above
Noted that JPL Sentry has removed 2018 UN1 as an impact risk - see above
Grabbed MPEC 2018-U74 - Daily Orbit Update - see above