Contents  on 7 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 7 October '17

Four objects reported inside ten LD

Four asteroids are known to be less than ten lunar distances (LD) from Earth today. Closest is risk-listed 2017 TB, which exits Earth's sphere of gravitational influence (SOI), traveling from 1.94 to 3.12 LD.

Earth passage I D ~Size Distance Today  Notes
0.13 LD Oct. 122012 TC4 15 m  6.30 from 7.78 LD intruder, radar/NHATS target, risk - DOU
0.23 LD Oct. 22017 SX17 8 m  6.93 to 8.44 LD intruder
1.14 LD Oct. 52017 TB 5 m  1.94 to 3.12 LD exits Earth SOI, risk
2.66 LD yesterday2017 TA 37 m  2.67 to 3.86 LD
Approaching (sorted by 10-LD bubble entry date)
8.93 LD Oct. 112017 SB20 38 m  < 10 LD tomorrow - DOU
8.5   LD Oct. 132005 TE49 15 m  < 10 LD Oct. 11, uncertainty +/- 10.1167 hours, NHATS target
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 1625 UTC with first follow-up for 2017 SB20 in today's DOU MPEC along with continuing follow-up for risk-listed intruder 2012 TC4.



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 7 October '17

The MPC's NEO Confirmation Page has 46 listings

When last checked at 2302 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 46 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 67 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 7 October '17

Minor Planet Electronic Circulars

As of last check at 2302 UTC, there have been seventeen MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-T36 - "22:53 UT" - 2017 SK21


MPEC 2017-T35 - "22:50 UT" - 2017 TK1


MPEC 2017-T34 - "22:47 UT" - 2017 TJ1


MPEC 2017-T33 - "22:44 UT" - 2017 TH1


MPEC 2017-T32 - "22:41 UT" - 2017 TG1


MPEC 2017-T31 - "22:37 UT" - 2017 TF1


MPEC 2017-T30 - "22:34 UT" - 2017 TE1


MPEC 2017-T29 - "22:31 UT" - 2017 TD1


MPEC 2017-T28 - "22:25 UT" - 2017 TC1


MPEC 2017-T27 - "22:22 UT" - 2017 TB1


MPEC 2017-T26 - "22:19 UT" - 2017 SQ21


MPEC 2017-T25 - "22:16 UT" - 2017 SP21


MPEC 2017-T24 - "22:12 UT" - 2017 SO21


MPEC 2017-T23 - "22:09 UT" - 2017 SN21


MPEC 2017-T22 - "22:06 UT" - 2017 SM21


MPEC 2017-T21 - "22:03 UT" - 2017 SL21


<< DOU on 7 Oct. '17 >>  MPEC 2017-T20 - "12:04 UT" - Daily Orbit Update

Observers  on 7 October '17

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2017-T23, 2017-T24, 2017-T25, 2017-T26 & 2017-T36 -- 2017 SQ21, 2017 SP21, 2017 SO21, 2017 SN21, 2017 SK21
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2017-T20 -- 2017 FJ90, 53319, 190166, 141670
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-T35 -- 2017 TK1
160Castelmartini Obs. in Italy, 5 in MPEC 2017-T20 -- 2008 MH1, 85709, 65679, 329520, 190208
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2017-T30 & 2017-T35 -- 2017 TK1, 2017 TE1
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2017-T25 & 2017-T35 -- 2017 TK1, 2017 SP21
203GiaGa Obs. in Italy, 4 in MPECs 2017-T20 & 2017-T24 -- 2017 SO21, 2017 PJ26, 2012 TC4, 496005
K88GINOP-KHK in Hungary, 2 in MPECs 2017-T24 & 2017-T25 -- 2017 SP21, 2017 SO21
J95Great Shefford Obs. in England, 5 in MPECs 2017-T23, 2017-T24, 2017-T28, 2017-T33 & 2017-T35 -- 2017 TK1, 2017 TH1, 2017 TC1, 2017 SO21, 2017 SN21
I89iTelescope Obs. Nerpio in Spain, 1 in MPEC 2017-T20 -- 2012 TC4
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 13 in MPECs 2017-T20, 2017-T21, 2017-T22, 2017-T26, 2017-T28, 2017-T29, 2017-T32 & 2017-T36 -- 2017 TG1, 2017 TD1, 2017 TC1, 2017 SU11, 2017 SQ21, 2017 SM21, 2017 SL21, 2017 SK21, 2017 SB20, 2017 RO2, 2017 RH15, 2017 QL33, 2000 YJ29
K93LCO Sutherland C in South Africa, 1 in MPEC 2017-T21 -- 2017 SL21
H01Magdalena Ridge Obs. (MRO) in New Mexico, 8 in MPECs 2017-T27, 2017-T28, 2017-T29, 2017-T30, 2017-T31, 2017-T33, 2017-T34 & 2017-T35 -- 2017 TK1, 2017 TJ1, 2017 TH1, 2017 TF1, 2017 TE1, 2017 TD1, 2017 TC1, 2017 TB1
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2017-T23, 2017-T24, 2017-T25, 2017-T27, 2017-T28, 2017-T29, 2017-T30, 2017-T33, 2017-T34 & 2017-T35 -- 2017 TK1, 2017 TJ1, 2017 TH1, 2017 TE1, 2017 TD1, 2017 TC1, 2017 TB1, 2017 SP21, 2017 SO21, 2017 SN21
K74Muensterschwarzach Obs. in Germany, 3 in MPEC 2017-T20 -- 2017 FJ90, 90075, 496005
Z80Northolt Branch Obs. in England, 4 in MPECs 2017-T20 & 2017-T35 -- 2017 TK1, 496005, 190208, 142040
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2017-T21, 2017-T22, 2017-T26, 2017-T28, 2017-T31, 2017-T32, 2017-T33, 2017-T34 & 2017-T36 -- 2017 TJ1, 2017 TH1, 2017 TG1, 2017 TF1, 2017 TC1, 2017 SQ21, 2017 SM21, 2017 SL21, 2017 SK21
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-T35 -- 2017 TK1
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-T35 -- 2017 TK1
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-T21 -- 2017 SL21
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2017-T22, 2017-T33 & 2017-T34 -- 2017 TJ1, 2017 TH1, 2017 SM21
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-T20 -- 3122
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-T35 -- 2017 TK1
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-T21 -- 2017 SL21
926Tenagra II Obs. in Arizona, 18 in MPECs 2017-T20, 2017-T21, 2017-T22, 2017-T23, 2017-T24, 2017-T25, 2017-T27, 2017-T28, 2017-T29, 2017-T30, 2017-T31, 2017-T32, 2017-T33, 2017-T34, 2017-T35 & 2017-T36 -- 2017 TK1, 2017 TJ1, 2017 TH1, 2017 TG1, 2017 TF1, 2017 TE1, 2017 TD1, 2017 TC1, 2017 TB1, 2017 SP21, 2017 SO21, 2017 SN21, 2017 SM21, 2017 SL21, 2017 SK21, 2017 NL6, 2014 QW296, 2000 SF8
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-T20 -- 2011 CY46
C51WISE in Earth polar orbit, 4 in MPEC 2017-T20 -- 2010 WL, 2004 FU4, 99907, 87684
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 October '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2302 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 TBNEODyS15302053-21172405.85e-05-6.55-7.120NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2017-10-03.338 to 2017-10-05.486."

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 7 October '17

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

2302Grabbed MPEC 2017-T31 - 2017 TF1 - see above
Grabbed MPEC 2017-T32 - 2017 TG1 - see above
Grabbed MPEC 2017-T33 - 2017 TH1 - see above
Grabbed MPEC 2017-T34 - 2017 TJ1 - see above
Grabbed MPEC 2017-T35 - 2017 TK1 - see above
Grabbed MPEC 2017-T36 - 2017 SK21 - see above
2238Grabbed MPEC 2017-T21 - 2017 SL21 - see above
Grabbed MPEC 2017-T22 - 2017 SM21 - see above
Grabbed MPEC 2017-T23 - 2017 SN21 - see above
Grabbed MPEC 2017-T24 - 2017 SO21 - see above
Grabbed MPEC 2017-T25 - 2017 SP21 - see above
Grabbed MPEC 2017-T26 - 2017 SQ21 - see above
Grabbed MPEC 2017-T27 - 2017 TB1 - see above
Grabbed MPEC 2017-T28 - 2017 TC1 - see above
Grabbed MPEC 2017-T29 - 2017 TD1 - see above
Grabbed MPEC 2017-T30 - 2017 TE1 - see above
1625Generated Traffic Report
1530Noted that NEODyS has posted 2017 TB as an impact risk - see above
Grabbed MPEC 2017-T20 - Daily Orbit Update - see above