Contents  on 6 October '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 6 October '18

Eight objects reported inside ten LD

Eight minor planets are known to be less than ten lunar distances (LD) from our planet today. While leaving Earth's SOI, traveling out from 2.04 to 3.49 LD, the nearest of the eight, 2018 TU, comes its closest to the Moon this time around -- 2.44 LD at 0602 UTC.

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
0.23 LD Sept. 25 2018 SD2 6 m  7.28 to 7.93 LD Sept. 10 - Oct. 10 intruder, NHATS target, risk
0.79 LD Sept. 30 2018 TC 15 m  6.66 to 7.94 LD Sept. 23 - Oct. 8 intruder, NHATS target - DOU
2.03 LD yesterday 2018 TU 11 m  2.04 to 3.49 LD Oct. 2 - 9 Moon closest 2.44 LD at 0602 UTC - DOU
4.06 LD Sept. 24 2018 RQ1 51 m  8.54 to 9.14 LD Sept. 11 - Oct. 8 NHATS target, risk - DOU
4.83 LD Oct. 2 2018 TB 35 m  8.68 to 10.32 LD Sept. 27 - today exits ten LD, risk - DOU
5.39 LD Oct. 2 2018 SD3 9 m  8.08 to 9.43 LD Sept. 27 - tomorrow NHATS target
6.18 LD Oct. 4 2018 SC3 20 m  6.81 to 7.74 LD Sept. 30 - Oct. 8
6.69 LD Oct. 8 2018 SG3 13 m  6.84 from 7.23 LD Oct. 2 - 13 NHATS target
Approaching Traffic - sorted by 10-LD bubble entry date
3.1   LD Oct. 17* 2014 US7 18 m  21.0 from 22.9 LD Oct. 12 - 22 EPU +/- 3.10 hours*, NHATS target
9.02 LD Oct. 15 2018 SL3 32 m  27.65 from 30.59 LD Oct. 14 - 17 DOU
8.7   LD Oct. 18* 2016 GC221 37 m  38.7 from 41.8 LD Oct. 17 - 20 EPU +/- 6.07 hours*
7.51 LD Oct. 29 475534 2006 TS7 195 m  93.65 from 97.95 LD Oct. 27 - 31
* EPU = Earth passage uncertainty

This report was generated at 1840 UTC with the recovery of departed 2017 SL16 (MPEC) and with follow-up in today's DOU MPEC for five objects active in the traffic table here and for departed objects 2018 RP5 and 2018 RO5.


<< Reading:  SpaceflightNow.com has a wrapup of the brief but exciting DLR/CNES MASCOT lander mission to PHA 162173 Ryugu (1999 JU3), deployed from JAXA's Hayabusa2 spacecraft.



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 6 October '18

The MPC's NEO Confirmation Page has 115 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 115 objects listed. Of these, 55 were "one nighters." So far The Tracking News has counted a total of 121 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 6 October '18

Minor Planet Electronic Circulars

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


<< DOU on 6 Oct. '18 >>  MPEC 2018-T65 - "12:05 UT" - Daily Orbit Update


MPEC 2018-T64 - "11:37 UT" - 2017 SL16


MPEC 2018-T63 - "11:35 UT" - 2016 JG12


MPEC 2018-T62 - "04:17 UT" - Comet P/2006 D1 = 2018 T1 (Hill)

Observers  on 6 October '18

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2018-T65 -- 2018 SN, 2018 SB1, 2018 RY, 2018 RB3, 2018 RA5, 2018 QQ1, 2018 PW23, 2018 PL9, 2018 NB, 2018 LZ5, 2017 SN14, 2017 HW1
T05ATLAS Haleakala in Hawaii, 6 in MPEC 2018-T65 -- 2018 SA3, 2001 QA143, 88263, 85804, 446924, 16834
T08ATLAS Mauna Loa in Hawaii, 15 in MPEC 2018-T65 -- 2018 NB, 523788, 523628, 443923, 438429, 418929, 18109, 17511, 17274, 162168, 13553, 115052, 9856, 6456, 4953
703Catalina Sky Survey (CSS) in Arizona, 45 in MPEC 2018-T65 -- 2018 TC, 2018 TB, 2018 SK3, 2018 RV5, 2018 RS1, 2018 PS23, 2018 PJ22, 2018 NB, 2018 KE3, 2016 TZ56, 2016 CE30, 2012 TT5, 2011 UA, 2010 VB72, 2009 TK, 2002 EC3, 96315, 69230, 65733, 523788, 523631, 523604, 523603, 481542, 443923, 438429, 418929, 414903, 413002, 217628, 20790, 17274, 163818, 155340, 155334, 153591, 152931, 12711, 12538, 115052, 105140, 5143, 3752, 3691, 1865
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2018-T64 & 2018-T65 -- 2018 RL4, 2018 PV23, 2018 EQ1, 2017 SL16
J27El Guijo Obs. in Spain, 5 in MPEC 2018-T65 -- 2011 UA, 523788, 523631, 518635, 115052
006Fabra Obs. in Spain, 4 in MPEC 2018-T65 -- 443923, 418929, 17274, 13553
E89Geyserland Obs. in New Zealand, 1 in MPEC 2018-T65 -- 18109
K88GINOP-KHK in Hungary, 3 in MPEC 2018-T65 -- 2018 TC, 2018 TB, 523599
246KLENOT in the Czech Republic, 2 in MPEC 2018-T65 -- 2018 TB, 523619
D95Kurihara Obs. in Japan, 1 in MPEC 2018-T65 -- 3200
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2018-T63 -- 2016 JG12
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2018-T65 -- 5751
711McDonald Obs. in Texas, 6 in MPECs 2018-T63 & 2018-T65 -- 2018 SR2, 2018 SA2, 2018 RU5, 2018 PJ9, 2018 LQ15, 2016 JG12
474Mt. John Obs. in New Zealand, 6 in MPEC 2018-T65 -- 2018 TU, 2018 SZ2, 2018 SN2, 2018 RU3, 2018 RQ1, 2016 CX264
G96Mt. Lemmon Survey (MLS) in Arizona, 38 in MPECs 2018-T63 & 2018-T65 -- 2018 SR2, 2018 SL3, 2018 SK1, 2018 SF3, 2018 SB3, 2018 RY7, 2018 RX7, 2018 RU1, 2018 RO7, 2018 RO2, 2018 RG7, 2018 RC1, 2018 QV1, 2017 WC29, 2016 JN, 2016 JG12, 2012 TT5, 2010 VB72, 2010 SH13, 2007 VM243, 523788, 523668, 514568, 443923, 438429, 418929, 388567, 344756, 277958, 213869, 20790, 17274, 162149, 153591, 153349, 138815, 5143, 1865
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2018-T65 -- 2018 TP
C23Olmen Obs. in Belgium, 1 in MPEC 2018-T65 -- 2018 SA3
557Ondrejov Obs. in the Czech Republic, 4 in MPEC 2018-T65 -- 2018 KE3, 523788, 17511, 155140
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-T65 -- 2018 EQ1
F52Pan-STARRS 2 (PS2) in Hawaii, 17 in MPEC 2018-T65 -- 2018 SK1, 2018 RX7, 2018 RR8, 2018 LZ5, 2018 KR2, 2009 SV17, 2001 SR263, 65733, 523628, 474706, 413002, 306595, 17511, 155340, 155334, 115052, 9058
C95SATINO-1 in France, 1 in MPEC 2018-T65 -- 115052
691Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2018-T65 -- 2018 SZ2, 2018 RR8, 2018 RC1, 2018 NN, 2018 FY1, 2015 TW143, 2008 TY3, 2001 SC170, 513358
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2018-T65 -- 2018 SY2, 2018 SE3, 2018 RV1, 2018 RO5, 2018 KF3, 2018 CY, 2017 WG2, 2016 XD1, 1998 SZ27
I52Steward Obs. Mt. Lemmon Station in Arizona, 9 in MPECs 2018-T63 & 2018-T65 -- 2018 SX2, 2018 SR2, 2018 SQ2, 2018 SK3, 2018 SF3, 2018 SA2, 2018 RW7, 2018 EQ1, 2016 JG12
461SZTE Asteroid Program in Hungary, 1 in MPEC 2018-T62 -- P/2018 T1
A16Tentlingen Obs. in Switzerland, 1 in MPEC 2018-T65 -- 518635
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2018-T65 -- 2018 TB, 2018 SK3, 2018 RP5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 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 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.
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 TRNEODyS18102087-2118396.74e-06-5.68-6.5-NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2018-10-02.311 to 2018-10-05.171."
2018 TBNEODyS18102095-210321.17e-06-6.21-6.230NEODyS: "Based on 131 optical observations (of which 1 are rejected as outliers) from 2018-10-02.423 to 2018-10-05.916."
JPL Sentry15302095-210327.3388e-07-6.40-6.430JPL: Computed at 07:00 today Pacific time based on 130 observations spanning 3.4929 days (2018-Oct-02.42196 to 2018-Oct-05.91491). Diameter approximately 0.036 km. from weighted mean H=24.89.
2018 SK3JPL Sentry1530R E M O V E DJPL: Risk listing removed at 1358 UTC today

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 6 October '18

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

1840Generated Traffic Report
1810Noted that NEODyS has updated its 2018 TB risk assessment - see above
Noted that NEODyS has posted 2018 TR as an impact risk - see above
1530Noted that JPL Sentry has removed 2018 SK3 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 TB risk assessment - see above
Grabbed MPEC 2018-T63 - 2016 JG12 - see above
Grabbed MPEC 2018-T64 - 2017 SL16 - see above
Grabbed MPEC 2018-T65 - Daily Orbit Update - see above
0444Grabbed MPEC 2018-T62 - Comet P/2006 D1 = 2018 T1 (Hill) - see above