Contents  on 14 October '17

Asteroid/Comet Connection (A/CC) Resources:

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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 14 October '17

Seven objects reported inside ten LD

Seven transient natural objects are reported within ten lunar distances (LD) of our home world today. Closest is intruder and risk-listed radar/NHATS target 2012 TC4, which is outbound from 2.65 to 4.13 LD

Earth passage I D ~Size Distance Today  Notes
0.13 LD Oct. 122012 TC4 15 m  2.65 to 4.13 LD intruder, radar/NHATS target, risk
2.14 LD Oct. 92017 TH2 6 m  5.66 to 6.71 LD
2.52 LD yesterday2017 TT1 12 m  3.27 to 5.14 LD
4.93 LD yesterday2017 TK2 24 m  5.30 to 6.70 LD
5.21 LD yesterday2017 TU1 20 m  5.33 to 6.25 LD risk - DOU
5.59 LD today2017 TV1 19 m  5.59 LD Earth closest at 0639 UTC
8.5   LD yesterday2005 TE49 15 m  8.5 to 9.0 LD uncertainty +/- 10.1167 hours, NHATS target
Approaching (sorted by 10-LD bubble entry date)
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

This report was generated at 1846 UTC with today's DOU MPEC reporting numerous discoveries of minimally observed objects including four departed close passers, two of them intruders with diameters roughly estimated at five meters: 2017 TQ2 whizzed by us at 0.27 LD and the Moon at 0.86 LD on September 30th and, ten days before that, 2017 SZ32 passed Earth at 0.53 LD and the Moon at 0.50 LD. Risk-listed 2017 SE33 went by at about 7.2 LD (uncertainty +/- 35 mins.) on September 19th. And what 2017 TR2 was doing is a bit of a mystery. JPL has calculated a passage of 4.3 LD on August 27th but indicates an uncertainty of greather than plus-or-minus ten days. Today's DOU also reports follow-up for outbound 2017 TU1, departed 2017 TS1, and distant 2003 UV11.

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 an object that has come within ten LD since A/CC began these traffic reports (2007) but is not presently so close. 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 14 October '17

The MPC's NEO Confirmation Page has 104 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 104 objects listed. Of these, 25 were "one nighters." So far The Tracking News has counted a total of 106 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 14 October '17

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 14 Oct. '17 >>  MPEC 2017-T65 - "12:05 UT" - Daily Orbit Update

Observers  on 14 October '17

A total of 23 observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPEC 2017-T65 -- 2017 SZ32, 2017 SG33, 2017 SA33
T08ATLAS Mauna Loa in Hawaii, 13 in MPEC 2017-T65 -- 2017 SO17, 2017 OD1, 2017 FJ90, 2011 EB7, 66146, 495959, 371336, 303250, 162694, 154589, 154268, 137199, 5189
703Catalina Sky Survey (CSS) in Arizona, 38 in MPEC 2017-T65 -- 2017 SQ11, 2017 SL2, 2017 SE2, 2017 RR15, 2017 QT35, 2017 QQ32, 2017 QL18, 2017 HH, 2008 AX28, 2006 KA40, 2003 UV11, 96744, 90075, 85839, 65679, 55408, 499307, 498143, 497176, 338176, 333888, 265962, 253586, 220909, 220839, 162998, 162566, 162215, 159399, 143624, 143404, 11500, 8037, 3361, 2212, 2201, 1980, 1865
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPEC 2017-T65 -- 2017 SL33, 2017 SK33, 2017 SJ33, 2017 SA33, 2017 RP2
151Eschenberg Obs. in Switzerland, 2 in MPEC 2017-T65 -- 2017 RR15, 1998 WZ1
203GiaGa Obs. in Italy, 2 in MPEC 2017-T65 -- 2017 TE2, 2017 SY20
K88GINOP-KHK in Hungary, 1 in MPEC 2017-T65 -- 96631
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-T65 -- 496817
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2017-T65 -- 2017 SM33
K91LCO Sutherland A in South Africa, 1 in MPEC 2017-T65 -- 2017 SL33
K93LCO Sutherland C in South Africa, 1 in MPEC 2017-T65 -- 2017 SD33
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-T65 -- 2017 TQ2
568_Marco Micheli on Mauna Kea in Hawaii, 4 in MPEC 2017-T65 -- 2017 SZ32, 2017 SE33, 2017 SC33, 2017 SB33
G96Mt. Lemmon Survey (MLS) in Arizona, 17 in MPEC 2017-T65 -- 2017 TS1, 2017 TQ2, 2017 TB1, 2017 SX11, 2017 SQ11, 2017 SO14, 2015 BF4, 2014 UR114, 2008 AX28, 498143, 471956, 449074, 367525, 333888, 26663, 142563, 1865
Z80Northolt Branch Obs. in England, 2 in MPEC 2017-T65 -- 2017 TU1, 2017 TG2
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPEC 2017-T65 -- 2017 SZ32, 2017 SM33, 2017 SL33, 2017 SK33, 2017 SJ33, 2017 SG33, 2017 SE33, 2017 SD33, 2017 SC33, 2017 SB33, 2017 SA33
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2017-T65 -- 2003 UV11
Y00SONEAR in Brazil, 1 in MPEC 2017-T65 -- 5189
691Spacewatch 0.9m telescope in Arizona, 8 in MPEC 2017-T65 -- 2017 SQ11, 2017 SO16, 2017 RV1, 2017 PF, 2017 NU6, 496816, 29075, 8037
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2017-T65 -- 2017 SO2, 2017 SG14, 2017 SF14, 2017 OP19
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-T65 -- 2017 SZ32
I76Tesla Obs. in Spain, 4 in MPEC 2017-T65 -- 2017 RR15, 2017 FJ90, 2014 YC15, 2004 SS
C51WISE in Earth polar orbit, 2 in MPEC 2017-T65 -- 2017 TR2, 2017 SH33
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 October '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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.





Notes for Today's Latest Risk Assessments
2017 TP2NEODyS1521209015.83e-08-7.20-7.20NEODyS: "Based on 20 optical observations (of which 3 are rejected as outliers) from 2017-10-11.178 to 2017-10-12.826."
2017 TU1JPL Sentry16002073-2116104.48161e-06-6.18-6.690JPL: Computed at 08:40 today Pacific time based on 40 observations spanning 2.5792 days (2017-Oct-10.32694 to 2017-Oct-12.90617). Diameter approximately 0.020 km. from weighted mean H=26.17.
NEODyS15212076-211645.52e-08-8.15-8.330NEODyS: "Based on 37 optical observations (of which 0 are rejected as outliers) from 2017-10-10.328 to 2017-10-12.907."
2017 SH33JPL Sentry16002026-2116222.23231e-08-4.19-4.590JPL: Computed at 08:24 today Pacific time based on 11 observations spanning 1.2440 days (2017-Sep-25.49326 to 2017-Sep-26.73723). Diameter approximately 0.490 km. from weighted mean H=19.19.
2017 SG33JPL Sentry15212051-210948.208e-10-8.46-8.860JPL: Computed at 08:06 today Pacific time based on 6 observations spanning .83078 days (2017-Sep-25.38015 to 2017-Sep-26.210934). Diameter approximately 0.055 km. from weighted mean H=23.94.
2017 SE33JPL Sentry15212058-211681.229871e-07-8.40-8.810JPL: Computed at 07:50 today Pacific time based on 6 observations spanning 1.1022 days (2017-Sep-24.41185 to 2017-Sep-25.51408). Diameter approximately 0.009 km. from weighted mean H=27.76.
2017 SB33JPL Sentry16302049-204912.108e-10-8.75-8.750JPL: Computed at 08:41 today Pacific time based on 6 observations spanning 1.1101 days (2017-Sep-24.27114 to 2017-Sep-25.381248). Diameter approximately 0.056 km. from weighted mean H=23.92.

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 14 October '17

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

1846Generated Traffic Report
1630Noted that JPL Sentry has posted 2017 SB33 as an impact risk - see above
1600Noted that JPL Sentry has posted 2017 SH33 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 TU1 risk assessment - see above
1521Noted that JPL Sentry has posted 2017 SE33 as an impact risk - see above
Noted that JPL Sentry has posted 2017 SG33 as an impact risk - see above
Noted that NEODyS has posted 2017 TP2 as an impact risk - see above
Noted that NEODyS has posted 2017 TU1 as an impact risk - see above
Grabbed MPEC 2017-T65 - Daily Orbit Update - see above