Contents  on 11 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 11 October '18

Eight objects reported inside ten LD

Eight minor planets are known to be inside ten lunar distances (LD) of our home world today. Nearest is 2018 TM3, which heads out from 4.07 to 4.61 LD

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
0.74 LD Oct. 7 2018 TV 7 m  6.00 to 7.87 LD Oct. 2 - 13 intruder, NHATS target, risk
1.27 LD Oct. 8 2018 TG2 5 m  4.53 to 6.18 LD Oct. 2 - 14 NHATS target
1.27 LD Oct. 8 2018 TE2 7 m  7.85 to 10.85 LD Oct. 5 - 11 exits ten LD
2.80 LD Oct. 3 2018 TH3 5 m  9.66 to 10.86 LD Sept. 25 - today NHATS target, exits ten LD
3.55 LD Oct. 8 2018 TM3 4 m  4.07 to 4.61 LD Sept. 29 - Oct. 18 NHATS target
4.30 LD Oct. 6 2018 TW1 10 m  9.40 to 11.02 LD Oct. 1 - 11 exits ten LD
6.67 LD yesterday 2018 TN3 8 m  6.74 to 7.15 LD Oct. 5 - 15
6.70 LD Oct. 8 2018 SG3 13 m  7.73 to 8.45 LD Oct. 2 - 13 NHATS target

This report was generated at 2014 UTC with the discovery of already departed 2018 TJ4 (MPEC), which went by us at 7.97 LD on October 2nd, and with follow-up in today's DOU MPEC for three approaching objects (see table below) and five departed objects: 2018 SM1, intruder 2018 TC, and including risk-listed objects 2018 TB2, 2018 TR, and 2018 TB, plus distant objects 2007 TV18 and 450894 2008 BT18, and observation from August and September of 2018 QJ1 (31.08 days added to 11.77-day observing arc).

Approaching - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
6.59 LD Oct. 15 2018 TS1 23 m  11.05 from 13.11 LD tomorrow - Oct. 18
3.1   LD Oct. 17* 2014 US7 18 m  11.5 from 13.4 LD tomorrow - Oct. 22 EPU +/- 3.10 hours*, NHATS target
9.04 LD Oct. 15 2018 SL3 32 m  14.16 from 16.61 LD Oct. 14 - 17 DOU
9.04 LD Oct. 16 2018 TZ2 39 m  20.57 from 24.04 LD Oct. 15 - 18 DOU
8.7   LD Oct. 18* 2016 GC221 37 m  23.1 from 26.2 LD Oct. 17 - 20 EPU +/- 6.07 hours*
7.51 LD Oct. 29 475534 2006 TS7 195 m  72.42 from 76.63 LD Oct. 27 - 31
7.7   LD Nov. 5* 2018 TF3 295 m  119.2 from 124.4 LD Nov. 4 - 7 EPU +/- 5.05 hours*, risk - DOU
* EPU = Earth passage uncertainty



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 11 October '18

The MPC's NEO Confirmation Page has 61 listings

When last checked at 2130 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 61 objects listed. Of these, 25 were "one nighters." So far The Tracking News has counted a total of 70 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 October '18

Minor Planet Electronic Circulars

As of last check at 2130 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-T138 - "16:34 UT" - 2018 TK4


MPEC 2018-T137 - "16:30 UT" - 2018 TJ4


<< DOU on 11 Oct. '18 >>  MPEC 2018-T136 - "12:07 UT" - Daily Orbit Update

Observers  on 11 October '18

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPEC 2018-T136 -- 2018 TV2, 2018 RW1, 2018 OK, 2018 MS6, 2018 LU15, 2018 GJ1, 2016 VS5, 2013 EU9
T05ATLAS Haleakala in Hawaii, 15 in MPEC 2018-T136 -- 2018 TT1, 2018 EB, 54789, 523641, 446791, 375505, 358744, 350988, 333889, 185702, 5751, 4953, 4401, 1916, 1627
T08ATLAS Mauna Loa in Hawaii, 20 in MPEC 2018-T136 -- 2018 RV5, 2018 NB, 2016 TZ56, 2011 UA, 65996, 65733, 523788, 523631, 523604, 481542, 457260, 446924, 443923, 438429, 20790, 16834, 5797, 5143, 3691, 1865
160Castelmartini Obs. in Italy, 8 in MPEC 2018-T136 -- 523619, 518635, 455594, 438429, 418929, 414960, 413260, 17274
703Catalina Sky Survey (CSS) in Arizona, 32 in MPEC 2018-T136 -- 2018 TP, 2018 TF3, 2018 TE3, 2018 RL2, 2018 RJ7, 2018 PJ22, 2018 NU3, 2018 LZ5, 2015 TN237, 2014 SK260, 2005 WF57, 1999 RV2, 523628, 439313, 422977, 418929, 375505, 31345, 267729, 256412, 253062, 250697, 21277, 18109, 17511, 162687, 154300, 115052, 5751, 4953, 4401, 4055
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 3 in MPEC 2018-T136 -- 2018 PQ23, 2018 HL2, 2015 AP43
K51Celado Obs. in Italy, 1 in MPEC 2018-T138 -- 2018 TK4
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2018-T136 -- 2018 LN2, 2015 XC130
W84%program code "%" (14) via DECam in Chile, 1 in MPEC 2018-T136 -- 2016 WM1
K89Digital Stargate Obs., 1 in MPEC 2018-T136 -- 2018 PE22
K88GINOP-KHK in Hungary, 6 in MPECs 2018-T136, 2018-T137 & 2018-T138 -- 2018 TK4, 2018 TJ4, 2018 SJ3, 2018 RR7, 2018 BK1, 414903
A17Guidestar Obs. in Germany, 1 in MPEC 2018-T136 -- 2018 SL3
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-T136 -- 185702
C41MASTER-II Kislovodsk in Russia, 1 in MPEC 2018-T136 -- 4953
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2018-T136 -- 2018 QJ1
G96Mt. Lemmon Survey (MLS) in Arizona, 31 in MPECs 2018-T136 & 2018-T137 -- 2018 TJ4, 2018 TB, 2018 SM1, 2018 SK3, 2018 RX7, 2018 RR3, 2018 JD5, 2015 BG311, 2014 MP60, 2013 VD13, 2009 SV17, 2008 TQ2, 2004 VB17, 2002 EC3, 86324, 65733, 523664, 523599, 523596, 523587, 516803, 515010, 414772, 34613, 292220, 18736, 170891, 159929, 155340, 138846, 100085
Z80Northolt Branch Obs. in England, 4 in MPEC 2018-T136 -- 2018 TQ2, 2018 SA3, 2001 QA143, 523631
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-T138 -- 2018 TK4
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-T136 -- 2018 QJ1
F52Pan-STARRS 2 (PS2) in Hawaii, 28 in MPECs 2018-T136 & 2018-T138 -- 2018 TN2, 2018 TK4, 2018 TC, 2018 RW7, 2018 RU3, 2018 RS1, 2018 RO7, 2018 QP, 2018 PS7, 2018 PE22, 2014 TG17, 2012 DG61, 2010 SH13, 2008 VB1, 2007 TV18, 2003 LG, 523628, 523626, 523614, 517829, 517681, 450894, 445267, 256412, 162980, 155140, 137044, 9856
A48Povegliano Veronese Obs. in Italy, 1 in MPEC 2018-T136 -- 2018 SA3
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2018-T136 -- 2018 TA3
C95SATINO-1 in France, 1 in MPEC 2018-T136 -- 140039
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2018-T136 -- 2018 TY, 2018 TS2, 2018 TR, 2018 TQ, 2018 SY2, 2018 RS1, 2018 OB1, 2014 QX432, 2007 TV18
I52Steward Obs. Mt. Lemmon Station in Arizona, 9 in MPECs 2018-T136, 2018-T137 & 2018-T138 -- 2018 TZ2, 2018 TP2, 2018 TK4, 2018 TJ4, 2018 SP3, 2018 SN, 2018 SM3, 2018 EB, 2015 XY378
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 8 in MPEC 2018-T136 -- 2018 TR, 2018 TB2, 2018 TB, 2018 SP3, 2018 SO3, 2018 SF3, 2018 RR7, 2018 RA7
L01Visnjan Obs., 3 in MPECs 2018-T136, 2018-T137 & 2018-T138 -- 2018 TK4, 2018 TJ4, 2015 NU2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 October '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2130 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 TF3JPL Sentry15102092-2117229.283068e-07-3.81-4.250JPL: Computed at 07:19 today Pacific time based on 32 observations spanning 4.0094 days (2018-Oct-06.3505 to 2018-Oct-10.35988). Diameter approximately 0.292 km. from weighted mean H=20.30.
NEODyS15102026-2118357.59e-07-3.85-4.36-NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2018-10-06.351 to 2018-10-10.239."
2018 TY2NEODyS15102046-209397.6e-08-3.72-4.090NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2018-10-05.367 to 2018-10-10.343."
2018 TS2NEODyS1510210512.32e-09-9.12-9.120NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2018-10-05.453 to 2018-10-10.401."
2018 TB2JPL Sentry1510R E M O V E DJPL: Risk listing removed at 1358 UTC today
NEODyS1510209515.61e-08-8.33-8.330NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2018-10-03.398 to 2018-10-10.388."
2018 TRJPL Sentry15102093-2116113.11551e-06-6.10-6.660JPL: Computed at 07:08 today Pacific time based on 52 observations spanning 8.8983 days (2018-Oct-02.30976 to 2018-Oct-11.20806). Diameter approximately 0.029 km. from weighted mean H=25.37.
NEODyS15102093-2117275.26e-06-5.88-6.30NEODyS: "Based on 48 optical observations (of which 0 are rejected as outliers) from 2018-10-02.311 to 2018-10-10.230."
2018 TBJPL Sentry15102095-210327.1217e-07-6.40-6.450JPL: Computed at 07:00 today Pacific time based on 146 observations spanning 8.1425 days (2018-Oct-02.42196 to 2018-Oct-10.564479). Diameter approximately 0.036 km. from weighted mean H=24.87.
NEODyS15102095-210321.01e-06-6.26-6.290NEODyS: "Based on 144 optical observations (of which 1 are rejected as outliers) from 2018-10-02.423 to 2018-10-10.285."
2018 SO3JPL Sentry1510R E M O V E DJPL: Risk listing removed at 1359 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 11 October '18

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

2014Generated Traffic Report
1722Grabbed MPEC 2018-T137 - 2018 TJ4 - see above
Grabbed MPEC 2018-T138 - 2018 TK4 - see above
1510Noted that JPL Sentry has removed 2018 SO3 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 TB risk assessment - see above
Noted that NEODyS has updated its 2018 TB risk assessment - see above
Noted that JPL Sentry has removed 2018 TB2 as an impact risk - see above
Noted that NEODyS has updated its 2018 TB2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 TF3 risk assessment - see above
Noted that NEODyS has updated its 2018 TF3 risk assessment - see above
Noted that JPL Sentry has updated its 2018 TR risk assessment - see above
Noted that NEODyS has updated its 2018 TR risk assessment - see above
Noted that NEODyS has updated its 2018 TS2 risk assessment - see above
Noted that NEODyS has updated its 2018 TY2 risk assessment - see above
Grabbed MPEC 2018-T136 - Daily Orbit Update - see above