Contents  on 16 October '17

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 16 October '17

Seventeen objects reported inside ten LD

Seventeen asteroids are reported inside ten lunar distances (LD) of our planet today. Newly announced intruder 2017 TH5 enters the Earth-Moon system, coming in from 1.92 to 0.26 LD at 1715 UTC and moving out to 0.79 LD from Earth. It will buzz the Moon tomorrow at 0.55 LD at 0204 UTC. Another new discovery, 2017 TE5, enters Earth's SOI (sphere of gravitational influence), zipping in from 3.82 to 1.75 LD.

Earth passage I D ~Size Distance Today  Notes
0.13 LD Oct. 122012 TC4 15 m  5.60 to 7.07 LD intruder, radar/NHATS target, risk
0.26 LD today2017 TH5 8 m  0.26 LD NEW, intruder today, Earth closest at 1715 UTC - MPEC
1.34 LD tomorrow2017 TE5 24 m  1.75 from 3.82 LD NEW, enters Earth SOI - MPEC
2.14 LD Oct. 92017 TH2 6 m  7.78 to 8.87 LD
2.52 LD Oct. 132017 TT1 12 m  7.32 to 9.60 LD
3.08 LD tomorrow2017 TW5 13 m  4.20 from 7.05 LD NEW - MPEC
3.78 LD Oct. 102017 TY5 19 m  9.35 to 10.92 LD NEW, exits ten LD - MPEC
4.17 LD yesterday2017 TK4 10 m  4.18 to 4.29 LD
4.56 LD Oct. 182017 TX5 23 m  5.98 from 7.67 LD NEW - MPEC
4.93 LD Oct. 132017 TK2 24 m  8.68 to 10.91 LD exits ten LD
5.21 LD Oct. 132017 TU1 20 m  7.78 to 9.63 LD risk
5.52 LD Oct. 222017 TQ5 11 m  9.21 from 10.30 LD NEW, enters ten LD - MPEC
5.59 LD Oct. 142017 TV1 19 m  6.87 to 8.44 LD
6.63 LD Oct. 192017 TA6 17 m  7.24 from 7.70 LD NEW - MPEC
6.84 LD Oct. 132017 TU5 12 m  8.17 to 9.24 LD NEW - MPEC
6.96 LD Oct. 122017 TZ5 15 m  9.85 to 11.51 LD NEW, exits ten LD - MPEC
8.12 LD tomorrow2017 TU3 39 m  8.15 from 8.77 LD DOU

This report was updated at 2208 UTC with eight discoveries, none of them coming closer than three-plus LD on their current passages, and all of them appearing in the accompanying active traffic tables -- one approaching and seven curently traveling within ten LD of our planet.
        Your first Busy Neighborhood traffic report was generated at 1810 UTC with five discoveries, two of which (2017 TH5 and 2017 TE5) appear in the above active traffic table. Of the other three, 2017 TX4 (MPEC) and risk-listed 2017 TA5 (MPEC) passed us at a bit more than seven LD on October 8th and 9th respectively, and intruder 2017 TF5 (MPEC) was within one LD of Earth during 8 to 12 October, flying by at about 0.7 LD on the 10th (uncertainty +/- 20 mins.). Today's DOU MPEC has additional observation of 2017 TU3 and follow-up for departed 2017 TS1, 2017 RS2, and 2017 NB7 (27.89 days added to previous 78.32-day observing arc), plus astrometry from September 30th for departed objects 2017 SR16 and risk-listed intruder 2017 SU17.

Approaching (sorted by 10-LD bubble entry date)
4.81 LD Oct. 212017 TG4 49 m  < 10 LD Oct. 18
3.4   LD Oct. 222017 TV5 14 m  < 10 LD Oct. 18, NEW, uncertainty +/- 15 mins. - MPEC
5.77 LD Oct. 22171576 1999 VP11 645 m  < 10 LD Oct. 20
8.66 LD Nov. 17444584 2006 UK 309 m  < 10 LD Nov. 16



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 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 16 October '17

The MPC's NEO Confirmation Page has 77 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 77 objects listed. Of these, 42 were "one nighters." So far The Tracking News has counted a total of 115 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 16 October '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been 28 MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-U28 - "19:39 UT" - 2017 TZ5


MPEC 2017-U27 - "19:35 UT" - 2017 TA6


MPEC 2017-U26 - "19:31 UT" - 2017 TY5


MPEC 2017-U25 - "19:26 UT" - 2017 TX5


MPEC 2017-U24 - "19:22 UT" - 2017 TW5


MPEC 2017-U23 - "19:17 UT" - 2017 TV5


MPEC 2017-U22 - "19:13 UT" - 2017 TT5


MPEC 2017-U21 - "19:09 UT" - 2017 TU5


MPEC 2017-U20 - "19:05 UT" - 2017 TS5


MPEC 2017-U19 - "19:03 UT" - 2017 TR5


MPEC 2017-U18 - "18:59 UT" - 2017 TQ5


MPEC 2017-U17 - "18:54 UT" - 2017 TP5


MPEC 2017-U16 - "18:50 UT" - 2017 TO5


MPEC 2017-U15 - "18:24 UT" - Comet C/2017 T1 (Heinze)


<< DOU on 16 Oct. '17 >>  MPEC 2017-U14 - "12:05 UT" - Daily Orbit Update


MPEC 2017-U13 - "11:43 UT" - 2017 TH5


MPEC 2017-U12 - "01:18 UT" - 2017 TE5


MPEC 2017-U11 - "01:14 UT" - 2017 TC5


MPEC 2017-U10 - "01:11 UT" - 2017 TX4


MPEC 2017-U09 - "01:07 UT" - 2017 TG5


MPEC 2017-U08 - "01:04 UT" - 2017 TF5


MPEC 2017-U07 - "01:00 UT" - 2017 TD5


MPEC 2017-U06 - "00:56 UT" - 2017 TB5


MPEC 2017-U05 - "00:49 UT" - 2017 TA5


MPEC 2017-U04 - "00:45 UT" - 2017 TZ4


MPEC 2017-U03 - "00:42 UT" - 2017 TY4


MPEC 2017-U02 - "00:37 UT" - 2017 TW4


MPEC 2017-U01 - "00:33 UT" - 2017 TV4

Observers  on 16 October '17

A total of 61 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-U01 -- 2017 TV4
H21Astronomical Research Obs. Westfield in Illinois, 25 in MPEC 2017-U14 -- 2017 SW14, 2017 SU17, 2017 SS17, 2017 SR16, 2017 SO2, 2017 SO16, 2017 SN16, 2017 SN10, 2017 SM12, 2017 SM10, 2017 SH10, 2017 RY15, 2017 RX15, 2017 RV15, 2017 RV1, 2017 RU15, 2017 RL, 2017 RK1, 2017 QV34, 2017 QL35, 2017 OP68, 2017 OH68, 2017 MO7, 2013 RE21, 2012 WL4
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-U01 -- 2017 TV4
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-U15 -- C/2017 T1
C77Bernezzo Obs. in Italy, 2 in MPECs 2017-U01 & 2017-U13 -- 2017 TV4, 2017 TH5
Q68Blue Mountains Obs. in New South Wales, 2 in MPEC 2017-U14 -- 496817, 154589
215Buchloe Obs. in Germany, 1 in MPEC 2017-U15 -- C/2017 T1
160Castelmartini Obs. in Italy, 7 in MPECs 2017-U01, 2017-U12, 2017-U14 & 2017-U25 -- 2017 TX5, 2017 TV4, 2017 TE5, 68950, 496018, 220909, 142040
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2017-U12, 2017-U14, 2017-U15 & 2017-U25 -- 2017 TX5, 2017 TE5, C/2017 T1, 2017 RR15
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2017-U14 -- 2017 QN16, 2017 GM7
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2017-U01 & 2017-U15 -- 2017 TV4, C/2017 T1
K87Dettelbach Vineyard Obs. in Germany, 4 in MPECs 2017-U04 & 2017-U14 -- 2017 TZ4, 2017 TG2, 2017 TF2, 2017 SN14
J27El Guijo Obs. in Spain, 4 in MPEC 2017-U14 -- 2017 RR15, 498548, 338292, 333888
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 5 in MPECs 2017-U08, 2017-U12, 2017-U13, 2017-U23 & 2017-U25 -- 2017 TX5, 2017 TV5, 2017 TH5, 2017 TF5, 2017 TE5
151Eschenberg Obs. in Switzerland, 4 in MPECs 2017-U13 & 2017-U14 -- 2017 TH5, 2017 RR15, 2004 SS, 11500
K83Forti Obs., 1 in MPEC 2017-U14 -- 96631
157Frasso Sabino Obs. in Italy, 2 in MPEC 2017-U14 -- 2017 TR1, 2012 TV78
K88GINOP-KHK in Hungary, 17 in MPECs 2017-U01, 2017-U02, 2017-U03, 2017-U04, 2017-U06, 2017-U07, 2017-U08, 2017-U09, 2017-U10, 2017-U12, 2017-U13, 2017-U15, 2017-U23, 2017-U25, 2017-U26, 2017-U27 & 2017-U28 -- 2017 TZ5, 2017 TZ4, 2017 TY5, 2017 TY4, 2017 TX5, 2017 TX4, 2017 TW4, 2017 TV5, 2017 TV4, 2017 TH5, 2017 TG5, 2017 TF5, 2017 TE5, 2017 TD5, 2017 TB5, 2017 TA6, C/2017 T1
J95Great Shefford Obs. in England, 8 in MPECs 2017-U01, 2017-U10, 2017-U12, 2017-U13, 2017-U17, 2017-U20, 2017-U21 & 2017-U25 -- 2017 TX5, 2017 TX4, 2017 TV4, 2017 TU5, 2017 TS5, 2017 TP5, 2017 TH5, 2017 TE5
A17Guidestar Obs. in Germany, 5 in MPECs 2017-U13 & 2017-U14 -- 2017 TS1, 2017 TH5, 2017 TE2, 2017 SW14, 2017 PS25
B15Inastars Obs. in Germany, 2 in MPECs 2017-U01 & 2017-U12 -- 2017 TV4, 2017 TE5
U69$Marian Urbanik in Slovakia via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-U15 -- C/2017 T1
U694Erik Bryssinck in Belgium via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-U15 -- C/2017 T1
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-U15 -- C/2017 T1
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-U15 -- C/2017 T1
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2017-U01 & 2017-U15 -- 2017 TV4, C/2017 T1
585Kiev Comet Station in Ukraine, 1 in MPEC 2017-U15 -- C/2017 T1
246KLENOT in the Czech Republic, 10 in MPECs 2017-U01, 2017-U04, 2017-U08, 2017-U09, 2017-U12, 2017-U13, 2017-U14 & 2017-U25 -- 2017 TZ4, 2017 TX5, 2017 TV4, 2017 TR1, 2017 TH5, 2017 TG5, 2017 TF5, 2017 TE5, 2017 TE2, 2017 SY20
046Klet Obs. in the Czech Republic, 2 in MPECs 2017-U12 & 2017-U13 -- 2017 TH5, 2017 TE5
Z43Landehen Obs., 2 in MPEC 2017-U14 -- 2017 RR15, 2014 YC15
K30Luscherz Obs. in Switzerland, 1 in MPEC 2017-U13 -- 2017 TH5
K38M57 Obs. in Italy, 3 in MPECs 2017-U01 & 2017-U14 -- 2017 TV4, 2017 TG2, 2017 RL
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-U02 -- 2017 TW4
B67Mirasteilas Obs. in Switzerland, 5 in MPEC 2017-U14 -- 2017 TG2, 2017 RL, 2008 MH1, 2004 SS, 3122
118Modra Obs. in Slovakia, 1 in MPEC 2017-U15 -- C/2017 T1
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-U13 -- 2017 TH5
G96Mt. Lemmon Survey (MLS) in Arizona, 31 in MPECs 2017-U02, 2017-U03, 2017-U04, 2017-U05, 2017-U06, 2017-U07, 2017-U08, 2017-U09, 2017-U10, 2017-U11, 2017-U12, 2017-U13, 2017-U14, 2017-U16, 2017-U17, 2017-U18, 2017-U19, 2017-U20, 2017-U21, 2017-U22, 2017-U23, 2017-U24, 2017-U25, 2017-U26, 2017-U27 & 2017-U28 -- 2017 TZ5, 2017 TZ4, 2017 TY5, 2017 TY4, 2017 TX5, 2017 TX4, 2017 TW5, 2017 TW4, 2017 TV5, 2017 TU5, 2017 TT5, 2017 TS5, 2017 TR5, 2017 TQ5, 2017 TP5, 2017 TO5, 2017 TH5, 2017 TG5, 2017 TF5, 2017 TE5, 2017 TE2, 2017 TD5, 2017 TC5, 2017 TB5, 2017 TA6, 2017 TA5, 2017 SS19, 2017 SE2, 2017 PA27, 2017 MO7, 2017 FE128
C47Nonndorf Obs. in Austria, 2 in MPEC 2017-U14 -- 2017 TO2, 2017 TG2
J69North Obs. in England, 1 in MPEC 2017-U14 -- 2017 TG2
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-U14 -- 190208
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2017-U12 -- 2017 TE5
C23Olmen Obs. in Belgium, 1 in MPEC 2017-U14 -- 2017 TG2
K63Pascoli Obs. in Italy, 9 in MPECs 2017-U04, 2017-U07, 2017-U09, 2017-U14, 2017-U24, 2017-U25 & 2017-U26 -- 2017 TZ4, 2017 TY5, 2017 TX5, 2017 TW5, 2017 TG5, 2017 TD5, 2017 SL17, 499490, 496005
L04ROASTERR-1 in Romania, 1 in MPEC 2017-U15 -- C/2017 T1
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2017-U04 -- 2017 TZ4
K33San Defendente Obs. in Italy, 1 in MPEC 2017-U01 -- 2017 TV4
104San Marcello Pistoiese Obs. in Italy, 13 in MPECs 2017-U01, 2017-U04, 2017-U06, 2017-U08, 2017-U09, 2017-U12, 2017-U13, 2017-U16, 2017-U21, 2017-U24, 2017-U25, 2017-U26 & 2017-U27 -- 2017 TZ4, 2017 TY5, 2017 TX5, 2017 TW5, 2017 TV4, 2017 TU5, 2017 TO5, 2017 TH5, 2017 TG5, 2017 TF5, 2017 TE5, 2017 TB5, 2017 TA6
H36Sandlot Obs. in Kansas, 2 in MPECs 2017-U01 & 2017-U26 -- 2017 TY5, 2017 TV4
204Schiaparelli Obs. in Italy, 3 in MPECs 2017-U01, 2017-U04 & 2017-U15 -- 2017 TZ4, 2017 TV4, C/2017 T1
G40#J.L. Tuten in Arkansas via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-U15 -- C/2017 T1
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-U15 -- C/2017 T1
Y00SONEAR in Brazil, 1 in MPEC 2017-U01 -- 2017 TV4
587Sormano Obs. in Italy, 2 in MPECs 2017-U01 & 2017-U15 -- 2017 TV4, C/2017 T1
691Spacewatch 0.9m telescope in Arizona, 18 in MPECs 2017-U04, 2017-U14 & 2017-U23 -- 2017 TZ4, 2017 TV5, 2017 TM2, 2017 TF1, 2017 SV20, 2017 SL17, 2017 SL14, 2017 SG14, 2017 SF14, 2017 RL16, 2017 RH15, 2017 PR25, 2017 HY50, 2017 GS6, 2016 TE93, 2011 JU2, 2008 TC4, 2007 TF68
291Spacewatch 1.8m telescope in Arizona, 16 in MPECs 2017-U14 & 2017-U17 -- 2017 TP5, 2017 SV19, 2017 ST17, 2017 SO21, 2017 SN10, 2017 SL16, 2017 RS2, 2017 NB7, 2017 FG3, 2017 FE1, 2014 WO7, 2013 BE19, 2012 XM145, 2008 QU3, 2008 FS6, 2006 VD13
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2017-U14 -- 2017 QT35, 11500
I52Steward Obs. Mt. Lemmon Station in Arizona, 19 in MPECs 2017-U04, 2017-U05, 2017-U06, 2017-U09, 2017-U11, 2017-U13, 2017-U16, 2017-U17, 2017-U18, 2017-U19, 2017-U20, 2017-U21, 2017-U22, 2017-U23, 2017-U24, 2017-U25, 2017-U26, 2017-U27 & 2017-U28 -- 2017 TZ5, 2017 TZ4, 2017 TY5, 2017 TX5, 2017 TW5, 2017 TV5, 2017 TU5, 2017 TT5, 2017 TS5, 2017 TR5, 2017 TQ5, 2017 TP5, 2017 TO5, 2017 TH5, 2017 TG5, 2017 TC5, 2017 TB5, 2017 TA6, 2017 TA5
A71Stixendorf Obs. in Austria, 1 in MPEC 2017-U15 -- C/2017 T1
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-U15 -- C/2017 T1
926Tenagra II Obs. in Arizona, 26 in MPECs 2017-U01, 2017-U02, 2017-U03, 2017-U04, 2017-U05, 2017-U07, 2017-U09, 2017-U10, 2017-U11, 2017-U13, 2017-U14, 2017-U15, 2017-U17, 2017-U18, 2017-U19, 2017-U20, 2017-U22, 2017-U23, 2017-U24, 2017-U25, 2017-U26, 2017-U27 & 2017-U28 -- 2017 TZ5, 2017 TZ4, 2017 TY5, 2017 TY4, 2017 TX5, 2017 TX4, 2017 TW5, 2017 TW4, 2017 TV5, 2017 TV4, 2017 TU3, 2017 TT5, 2017 TS5, 2017 TR5, 2017 TQ5, 2017 TP5, 2017 TJ2, 2017 TH5, 2017 TG5, 2017 TD5, 2017 TC5, 2017 TA6, 2017 TA5, C/2017 T1, 2016 SL3, 2013 UR5
A16Tentlingen Obs. in Switzerland, 1 in MPEC 2017-U14 -- 2017 FJ90
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-U14 -- 2017 HZ4
718Wiggins Obs. in Utah, 1 in MPEC 2017-U13 -- 2017 TH5
754Yerkes Obs. in Wisconsin, 16 in MPEC 2017-U14 -- 2017 RU, 2017 RK1, 2017 QY34, 2017 QV34, 2017 QL35, 2017 QG3, 2017 PT25, 2017 PJ26, 2017 PF, 2017 PA27, 2017 OG68, 2017 OD20, 2017 LU, 2017 KR34, 2017 HN3, 2017 FH90
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 October '17

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
2017 TA6JPL Sentry22362049-21161050.0001847238989-4.91-5.400JPL: Computed at 15:26 today Pacific time based on 21 observations spanning 1.0106 days (2017-Oct-15.43676 to 2017-Oct-16.44738). Diameter approximately 0.017 km. from weighted mean H=26.53.
2017 TW5JPL Sentry21342072-211562.1223836e-06-6.69-6.890JPL: Computed at 13:53 today Pacific time based on 20 observations spanning 1.1846 days (2017-Oct-15.3166 to 2017-Oct-16.50123). Diameter approximately 0.013 km. from weighted mean H=27.06.
2017 TA5JPL Sentry05302081-2117179.354548e-06-6.38-6.920JPL: Computed at 20:57 Oct. 15th Pacific time based on 17 observations spanning 2.0424 days (2017-Oct-13.23998 to 2017-Oct-15.28234). Diameter approximately 0.012 km. from weighted mean H=27.25.
2017 TT3NEODyS15502059-211734.99e-07-6.82-6.920NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2017-10-10.438 to 2017-10-15.414."
2017 TU1NEODyS15502076-211667.21e-08-8.02-8.290NEODyS: "Based on 40 optical observations (of which 0 are rejected as outliers) from 2017-10-10.328 to 2017-10-12.907."
2017 SU17JPL Sentry15502069-2117342.797215e-05-6.30-6.840JPL: Computed at 08:44 today Pacific time based on 31 observations spanning 4.8292 days (2017-Sep-26.44444 to 2017-Oct-01.2736). Diameter approximately 0.008 km. from weighted mean H=28.01.
2017 HZ4JPL Sentry20002091-210644.239977e-06-6.14-6.190JPL #2 for the day: Computed at 12:04 today Pacific time based on 53 observations spanning 53.553 days (2017-Apr-26.44436 to 2017-Jun-18.997168). Diameter approximately 0.023 km. from weighted mean H=25.86.
2012 TC4JPL Sentry1800R E M O V E DJPL: Risk listing removed at 1604 UTC Oct. 9th.

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 16 October '17

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

2236Noted that JPL Sentry has posted 2017 TA6 as an impact risk - see above
2208Updated Traffic Report
2134Noted that JPL Sentry has posted 2017 TW5 as an impact risk - see above
2000Noted that JPL Sentry has updated its 2017 HZ4 risk assessment - see above
Grabbed MPEC 2017-U19 - 2017 TR5 - see above
Grabbed MPEC 2017-U20 - 2017 TS5 - see above
Grabbed MPEC 2017-U21 - 2017 TU5 - see above
Grabbed MPEC 2017-U22 - 2017 TT5 - see above
Grabbed MPEC 2017-U23 - 2017 TV5 - see above
Grabbed MPEC 2017-U24 - 2017 TW5 - see above
Grabbed MPEC 2017-U25 - 2017 TX5 - see above
Grabbed MPEC 2017-U26 - 2017 TY5 - see above
Grabbed MPEC 2017-U27 - 2017 TA6 - see above
Grabbed MPEC 2017-U28 - 2017 TZ5 - see above
1901Grabbed MPEC 2017-U16 - 2017 TO5 - see above
Grabbed MPEC 2017-U17 - 2017 TP5 - see above
Grabbed MPEC 2017-U18 - 2017 TQ5 - see above
1834Grabbed MPEC 2017-U15 - Comet C/2017 T1 (Heinze) - see above
1800Noted that JPL Sentry has removed 2012 TC4 as an impact risk - see above
1550Noted that JPL Sentry has updated its 2017 HZ4 risk assessment - see above
Noted that JPL Sentry has updated its 2017 SU17 risk assessment - see above
Noted that NEODyS has posted 2017 TT3 as an impact risk - see above
Noted that NEODyS has updated its 2017 TU1 risk assessment - see above
Grabbed MPEC 2017-U13 - 2017 TH5 - see above
Grabbed MPEC 2017-U14 - Daily Orbit Update - see above
0530Noted that JPL Sentry has posted 2017 TA5 as an impact risk - see above
0313Grabbed MPEC 2017-U03 - 2017 TY4 - see above
Grabbed MPEC 2017-U04 - 2017 TZ4 - see above
Grabbed MPEC 2017-U05 - 2017 TA5 - see above
Grabbed MPEC 2017-U06 - 2017 TB5 - see above
Grabbed MPEC 2017-U07 - 2017 TD5 - see above
Grabbed MPEC 2017-U08 - 2017 TF5 - see above
Grabbed MPEC 2017-U09 - 2017 TG5 - see above
Grabbed MPEC 2017-U10 - 2017 TX4 - see above
Grabbed MPEC 2017-U11 - 2017 TC5 - see above
Grabbed MPEC 2017-U12 - 2017 TE5 - see above
0041Grabbed MPEC 2017-U01 - 2017 TV4 - see above
Grabbed MPEC 2017-U02 - 2017 TW4 - see above