Contents  on 24 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 24 October '18

Five objects reported inside ten LD

There are reportedly five objects moving inside ten lunar distances (LD) of Earth today. Nearest are 2018 US1, outbound from 4.32 to 5.72 LD, and 2018 UH1, which comes its closest to our planet this time around -- 5.31 LD (based on obsolete data).

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
0.57 LD Oct. 17 2018 UL 5 m  8.16 to 9.41 LD Oct. 9 - 25 intruder, NHATS target, risk
2.29 LD Oct. 21 2018 US1 13 m  4.32 to 5.72 LD Oct. 15 - 27 DOU
5.17 LD Oct. 11 2018 TS4 11 m  8.16 to 8.55 LD Sept. 25 - Oct. 28 NHATS target
5.31 LD today 2018 UH1 33 m  5.31 LD Oct. 21 - 27 Earth closest at 0459 UTC, data obsolete
6.80 LD Oct. 13 2018 UE1 16 m  9.88 to 10.40 LD Oct. 2 - 24 NHATS target, exits ten LD, data obsolete
* EPU = Earth passage uncertainty

This report was delayed after being generated at 2117 UTC with the discoveries announced yesterday of approaching 2018 UY1 (MPEC) and of 2018 UC2 (MPEC, DOU), which left our ten-LD traffic reporting "bubble" yesterday after flying by us at 9.42 LD. Also, three lost objects were announced in the DOU yesterday and were processed by JPL into Horizons without calculating an in-house orbit solution and without assigning an uncertainty rating. That said, 2018 SV13 may have passed the Moon at 0.2 LD and Earth at 1.1 LD on September 19th, while 2018 TS6's Earth passage was at perhaps 1.7 LD and 2018 TT6's at 1.9 LD. The DOUs for both today and yesterday have follow-up observations of passing 2018 UH1, outbound objects 2018 US1 and 2018 UE1, and distant 2013 UG1. We need to note that JPL Horizons has not, at last check, updated its orbit solutions for 2018 UH1 and 2018 UE1 using these new observations, so the numbers in the above traffic table are out of date for those two objects. Yesterday's DOU additionally had observation of distant 68216 2001 CV26 and today's has follow-up for approaching objects 2018 UQ1 and 475534 2006 TS7.

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
5.38 LD Oct. 30 2018 UC 21 m  13.19 from 15.15 LD Oct. 26 - Nov. 3 NHATS target
7.51 LD Oct. 29 475534 2006 TS7 195 m  19.78 from 23.60 LD Oct. 27 - 31 DOU
3.9   LD Dec. 2* 2018 TG6 12 m  11.5 from 11.9 LD Oct. 30 - Jan. 4 EPU +/- 1.53 hours*, NHATS target, risk
7.4   LD Nov. 4* 2018 UY1 53 m  21.9 from 23.8 LD Nov. 1 - 8 NEW, EPU +/- 36 mins.* - MPEC
7.77 LD Nov. 5 2018 TF3 288 m  55.46 from 60.20 LD Nov. 4 - 7
9.4   LD Nov. 13* 2018 UQ1 145 m  58.2 from 61.2 LD Nov. 12 - 15 EPU +/- 1.55 hours* - DOU
7.4   LD Nov. 27* 2008 WD14 89 m  66.1 from 67.9 LD Nov. 23 - 30 EPU +/- 2.04 days*
4.1   LD Dec. 9* 2013 VX4 62 m  63.0 from 64.4 LD Dec. 3 - 15 EPU +/- 2.35 days*
7.36 LD Dec. 22 163899 2003 SD220 1.17 km  68.55 from 69.30 LD Dec. 17 - 26 NHATS target
7.3   LD Jan. 9* 2013 YM2 19 m  65.2 from 65.6 LD Jan. 2 - 16 EPU +/- 1.25 days*, NHATS target



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-plus years ago but are not presently 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 24 October '18

The MPC's NEO Confirmation Page has 15 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fifteen objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 20 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 24 October '18

Minor Planet Electronic Circulars

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


MPEC 2018-U68 - "15:35 UT" - Retraction of 2015 VB172


<< DOU on 24 Oct. '18 >>  MPEC 2018-U67 - "12:07 UT" - Daily Orbit Update


MPEC 2018-U66 - "11:35 UT" - 295 New Main Classical Belt Objects


MPEC 2018-U65 - "10:48 UT" - 2003 UV291


MPEC 2018-U64 - "10:39 UT" - 1997 GA45 = 2001 FH193


MPEC 2018-U63 - "10:20 UT" - 2003 UK293

Observers  on 24 October '18

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2018-U67 -- 2018 UQ1, 2018 UM1, 2018 TV4, 2018 TQ2, 2018 SR2, 2018 SK3
T08ATLAS Mauna Loa in Hawaii, 6 in MPEC 2018-U67 -- 2001 QA143, 65706, 523631, 523603, 349507, 3552
069Baldone Obs. in Latvia, 1 in MPEC 2018-U67 -- 345705
160Castelmartini Obs. in Italy, 3 in MPEC 2018-U67 -- 2018 UC2, 457260, 442742
J95Great Shefford Obs. in England, 3 in MPEC 2018-U67 -- 2018 US1, 2018 UC2, 2018 TY5
568@Jean-Marc Petit on Mauna Kea in Hawaii, 298 in MPECs 2018-U63, 2018-U64, 2018-U65 & 2018-U66 -- 2015 VZ172, 2015 VZ171, 2015 VZ170, 2015 VZ169, 2015 VZ168, 2015 VY172, 2015 VY171, 2015 VY170, 2015 VY169, 2015 VY168, 2015 VX172, 2015 VX171, 2015 VX170, 2015 VX169, 2015 VX168, 2015 VW172, 2015 VW171, 2015 VW170, 2015 VW169, 2015 VW168, 2015 VV172, 2015 VV171, 2015 VV170, 2015 VV169, 2015 VV168, 2015 VU172, 2015 VU171, 2015 VU170, 2015 VU169, 2015 VU168, 2015 VT173, 2015 VT172, 2015 VT171, 2015 VT170, 2015 VT169, 2015 VT168, 2015 VS173, 2015 VS172, 2015 VS171, 2015 VS170, 2015 VS169, 2015 VS168, 2015 VR173, 2015 VR172, 2015 VR171, 2015 VR170, 2015 VR169, 2015 VR168, 2015 VQ173, 2015 VQ172, 2015 VQ171, 2015 VQ170, 2015 VQ169, 2015 VQ168, 2015 VP173, 2015 VP172, 2015 VP171, 2015 VP170, 2015 VP169, 2015 VP168, 2015 VO173, 2015 VO172, 2015 VO171, 2015 VO170, 2015 VO169, 2015 VN173, 2015 VN172, 2015 VN171, 2015 VN170, 2015 VN169, 2015 VM173, 2015 VM172, 2015 VM171, 2015 VM170, 2015 VM169, 2015 VL173, 2015 VL172, 2015 VL171, 2015 VL170, 2015 VL169, 2015 VK173, 2015 VK172, 2015 VK171, 2015 VK170, 2015 VK169, 2015 VJ173, 2015 VJ172, 2015 VJ171, 2015 VJ170, 2015 VJ169, 2015 VH173, 2015 VH172, 2015 VH171, 2015 VH170, 2015 VH169, 2015 VG173, 2015 VG172, 2015 VG171, 2015 VG170, 2015 VG169, 2015 VF173, 2015 VF172, 2015 VF171, 2015 VF170, 2015 VF169, 2015 VE173, 2015 VE172, 2015 VE171, 2015 VE170, 2015 VE169, 2015 VD173, 2015 VD172, 2015 VD171, 2015 VD170, 2015 VD169, 2015 VC173, 2015 VC172, 2015 VC171, 2015 VC170, 2015 VC169, 2015 VB173, 2015 VB172, 2015 VB171, 2015 VB170, 2015 VB169, 2015 VA173, 2015 VA172, 2015 VA171, 2015 VA170, 2015 VA169, 2015 RZ280, 2015 RZ279, 2015 RY280, 2015 RY279, 2015 RX280, 2015 RX279, 2015 RW280, 2015 RW279, 2015 RV280, 2015 RV279, 2015 RU280, 2015 RU279, 2015 RT280, 2015 RT279, 2015 RS280, 2015 RS279, 2015 RR280, 2015 RR279, 2015 RQ280, 2015 RQ279, 2015 RP281, 2015 RP280, 2015 RP279, 2015 RO281, 2015 RO280, 2015 RO279, 2015 RN281, 2015 RN280, 2015 RN279, 2015 RM281, 2015 RM280, 2015 RM279, 2015 RL281, 2015 RL280, 2015 RL279, 2015 RK281, 2015 RK280, 2015 RJ281, 2015 RJ280, 2015 RH281, 2015 RH280, 2015 RG281, 2015 RG280, 2015 RF281, 2015 RF280, 2015 RE281, 2015 RE280, 2015 RD281, 2015 RD280, 2015 RC281, 2015 RC280, 2015 RB281, 2015 RB280, 2015 RA281, 2015 RA280, 2015 ML150, 2015 KZ175, 2015 KY175, 2015 KX175, 2015 KW175, 2015 KV175, 2015 KU175, 2015 KT175, 2015 KS175, 2015 KR175, 2015 KQ175, 2015 KP175, 2015 KO175, 2015 KN175, 2015 KM175, 2015 KL175, 2015 KK175, 2015 KJ175, 2015 KH175, 2015 KG175, 2015 KF175, 2015 KE175, 2015 KD176, 2015 KD175, 2015 KC176, 2015 KC175, 2015 KB176, 2015 KB175, 2015 KA176, 2015 KA175, 2015 GZ58, 2015 GZ57, 2015 GZ56, 2015 GY58, 2015 GY57, 2015 GY56, 2015 GX58, 2015 GX57, 2015 GX56, 2015 GW58, 2015 GW57, 2015 GW56, 2015 GV58, 2015 GV57, 2015 GV56, 2015 GU58, 2015 GU57, 2015 GU56, 2015 GT58, 2015 GT57, 2015 GT56, 2015 GS58, 2015 GS57, 2015 GS56, 2015 GR58, 2015 GR57, 2015 GR56, 2015 GQ58, 2015 GQ57, 2015 GQ56, 2015 GP58, 2015 GP57, 2015 GP56, 2015 GO58, 2015 GO57, 2015 GO56, 2015 GN58, 2015 GN57, 2015 GN56, 2015 GM58, 2015 GM57, 2015 GM56, 2015 GL58, 2015 GL57, 2015 GL56, 2015 GK58, 2015 GK57, 2015 GK56, 2015 GJ59, 2015 GJ58, 2015 GJ57, 2015 GJ56, 2015 GH59, 2015 GH58, 2015 GH57, 2015 GH56, 2015 GG59, 2015 GG58, 2015 GG57, 2015 GG56, 2015 GF59, 2015 GF58, 2015 GF57, 2015 GF56, 2015 GE59, 2015 GE58, 2015 GE57, 2015 GE56, 2015 GD59, 2015 GD58, 2015 GD57, 2015 GC59, 2015 GC58, 2015 GC57, 2015 GB59, 2015 GB58, 2015 GB57, 2015 GA59, 2015 GA58, 2015 GA57, 2003 UV291, 2003 UK293, 1997 GA45
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2018-U67 -- 2018 UZ1
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-U67 -- 2013 UG1
C23Olmen Obs. in Belgium, 1 in MPEC 2018-U67 -- 65733
F52Pan-STARRS 2 (PS2) in Hawaii, 5 in MPEC 2018-U67 -- 2018 UZ1, 2001 QA143, 442742, 382459, 3200
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2018-U67 -- 2016 UA, 3552
C95SATINO-1 in France, 1 in MPEC 2018-U67 -- 2018 SA3
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2018-U67 -- 2018 UZ1
A16Tentlingen Obs. in Switzerland, 1 in MPEC 2018-U67 -- 36284
B18Terskol Obs. in Russia, 1 in MPEC 2018-U67 -- 475534
L01Visnjan Obs., 1 in MPEC 2018-U67 -- 2018 UZ1
718Wiggins Obs. in Utah, 1 in MPEC 2018-U67 -- 2018 TQ2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 October '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 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 UM1JPL Sentry17302067-2118344.20113717e-05-3.94-4.480JPL: Computed at 07:45 today Pacific time based on 44 observations spanning 3.9369 days (2018-Oct-19.1455 to 2018-Oct-23.082438). Diameter approximately 0.072 km. from weighted mean H=23.35.

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 24 October '18

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

2117Generated Traffic Report
1730Noted that JPL Sentry has updated its 2018 UM1 risk assessment - see above
Grabbed MPEC 2018-U63 - 2003 UK293 - see above
Grabbed MPEC 2018-U64 - 1997 GA45 = 2001 FH193 - see above
Grabbed MPEC 2018-U65 - 2003 UV291 - see above
Grabbed MPEC 2018-U66 - 295 New Main Classical Belt Objects - see above
Grabbed MPEC 2018-U67 - Daily Orbit Update - see above
Grabbed MPEC 2018-U68 - Retraction of 2015 VB172 - see above