Contents  on 11 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 11 October '17

Eight objects reported inside ten LD

Eight small transient neighbors are known to be flying inside ten lunar distances (LD) of Earth today. Nearest is risk-listed radar/NHATS target 2012 TC4, which enters the Earth-Moon system, moving in from 1.87 to 0.39 LD. At 0541 UTC tomorrow morning (1:41am EDT) it will come its closest to us this time around, reaching 0.13 LD as it passes over Antarctica.

Earth passage I D ~Size Distance Today  Notes
0.13 LD tomorrow2012 TC4 15 m  0.39 from 1.87 LD intruder today, radar/NHATS target, risk - DOU, radar, radar
1.14 LD Oct. 52017 TB 5 m  7.00 to 8.33 LD risk
2.52 LD Oct. 132017 TT1 14 m  3.71 from 5.72 LD NEW - MPEC
5.21 LD Oct. 132017 TU1 19 m  6.29 from 7.84 LD NEW - MPEC
5.58 LD Oct. 142017 TV1 19 m  7.70 from 9.46 LD NEW - MPEC
8.5   LD Oct. 132005 TE49 15 m  9.6 from 10.9 LD enters ten LD, uncertainty +/- 10.1167 hours, NHATS target
8.93 LD today2017 SB20 36 m  8.93 LD Earth closest at 0128 UTC
8.96 LD yesterday2017 SN21 21 m  8.98 to 9.24 LD
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 1916 UTC with four discoveries, three of which appear in the accompanying active traffic table. The other is already departed 2017 TS1 (MPEC), which went by us at 7.41 LD on October 4th. Today's DOU MPEC has astrometry from last month for risk-listed 2017 RH16, first follow-up for the recovery of distant 2003 UV11, and continuing follow-up for 2012 TC4, which also has further radar observation posted yesterday and today.

Reading:  A ring is reported around dwarf planet 136108 Haumea (2003 EL61) in the outer Solar System after observing it occulting a star. And NASA/JPL has a news item about intruder 2012 TC4 saying that "Tens of professionally run telescopes across the globe will be making ground-based observations in wavelengths from visible to near-infrared to radar. Amateur astronomers may contribute more observations..."



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.

Radar Astrometry  on 11 October '17

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 1732 UTC when the database was dated 11 Oct.



Photometry and some astrometry is needed for upcoming radar targets. See Arecibo and Goldstone schedules.

NEOCP Activity  on 11 October '17

The MPC's NEO Confirmation Page has 91 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 91 objects listed. Of these, 34 were "one nighters." So far The Tracking News has counted a total of 103 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 '17

Minor Planet Electronic Circulars

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


MPEC 2017-T48 - "14:45 UT" - 2017 TV1


MPEC 2017-T47 - "14:41 UT" - 2017 TU1


MPEC 2017-T46 - "14:38 UT" - 2017 TT1


MPEC 2017-T45 - "14:34 UT" - 2017 TS1


MPEC 2017-T44 - "14:30 UT" - 2017 TR1


<< DOU on 11 Oct. '17 >>  MPEC 2017-T43 - "12:03 UT" - Daily Orbit Update

Observers  on 11 October '17

A total of 35 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 4 in MPEC 2017-T43 -- 333888, 326388, 265962, 11500
T05ATLAS Haleakala in Hawaii, 9 in MPECs 2017-T43 & 2017-T44 -- 2017 TR1, 2014 YC15, 500749, 498548, 338292, 326388, 294739, 153415, 3122
T08ATLAS Mauna Loa in Hawaii, 7 in MPEC 2017-T43 -- 2015 KN120, 21374, 162998, 11405, 8035, 5143, 3753
C77Bernezzo Obs. in Italy, 2 in MPECs 2017-T43 & 2017-T47 -- 2017 TU1, 2012 TC4
160Castelmartini Obs. in Italy, 4 in MPECs 2017-T43, 2017-T45, 2017-T47 & 2017-T48 -- 2017 TV1, 2017 TU1, 2017 TS1, 2012 TC4
703Catalina Sky Survey (CSS) in Arizona, 38 in MPECs 2017-T43, 2017-T44, 2017-T45, 2017-T46, 2017-T47 & 2017-T48 -- 2017 TV1, 2017 TU1, 2017 TT1, 2017 TS1, 2017 TR1, 2017 SS19, 2017 SE2, 2017 RV1, 2017 RR15, 2017 QT35, 2017 OQ68, 2013 RE21, 2006 KA40, 96744, 96590, 90075, 65679, 55408, 52762, 497176, 496018, 456651, 337228, 333888, 265962, 220909, 220839, 162998, 162566, 162215, 162186, 162011, 143624, 11500, 3361, 2201, 1980, 1865
107Cavezzo Obs. in Italy, 2 in MPECs 2017-T44 & 2017-T47 -- 2017 TU1, 2017 TR1
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2017-T44 -- 2017 TR1
J27El Guijo Obs. in Spain, 3 in MPEC 2017-T43 -- 2008 MH1, 333888, 265962
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-T43 -- 2012 TC4
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2012 TC4
K78Iota Scorpii Obs., 1 in MPEC 2017-T43 -- 2012 TC4
U69"M. Suzuki in Japan via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-T44 -- 2017 TR1
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2017-T43 -- 2012 TC4
W19Kalamazoo Obs. in Michigan, 2 in MPEC 2017-T43 -- 190208, 3122
585Kiev Comet Station in Ukraine, 1 in MPEC 2017-T45 -- 2017 TS1
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2017-T43 -- 2012 TC4
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2017-T43 -- 2012 TC4
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2017-T43, 2017-T45, 2017-T47 & 2017-T48 -- 2017 TV1, 2017 TU1, 2017 TS1, 2012 TC4
K32Maritime Alps Obs. in Italy, 1 in MPEC 2017-T43 -- 2012 TC4
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2017-T43 -- 2012 TC4
G96Mt. Lemmon Survey (MLS) in Arizona, 16 in MPECs 2017-T43 & 2017-T45 -- 2017 TS1, 2017 TJ1, 2017 SV11, 2017 OP68, 2017 LU, 2014 YC15, 2014 VM, 2011 XO3, 2009 EO2, 1999 AF4, 498548, 497232, 476187, 456536, 338292, 153415
A13Naef Obs. in Switzerland, 2 in MPEC 2017-T43 -- 2017 OQ68, 2006 KA40
F51Pan-STARRS 1 (PS1) in Hawaii, 18 in MPECs 2017-T43 & 2017-T48 -- 2017 TV1, 2017 SL14, 2017 SJ2, 2017 KR34, 2010 SA12, 96631, 499582, 411201, 376707, 350536, 333755, 333480, 304640, 190166, 17181, 162913, 162679, 100756
K63Pascoli Obs. in Italy, 1 in MPEC 2017-T45 -- 2017 TS1
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2017-T43 -- 2012 TC4
K33San Defendente Obs. in Italy, 1 in MPEC 2017-T43 -- 2012 TC4
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-T44 -- 2017 TR1
204Schiaparelli Obs. in Italy, 4 in MPECs 2017-T44, 2017-T45, 2017-T47 & 2017-T48 -- 2017 TV1, 2017 TU1, 2017 TS1, 2017 TR1
Y00SONEAR in Brazil, 3 in MPECs 2017-T43 & 2017-T44 -- 2017 TR1, 66146, 496981
587Sormano Obs. in Italy, 2 in MPECs 2017-T44 & 2017-T46 -- 2017 TT1, 2017 TR1
691Spacewatch 0.9m telescope in Arizona, 8 in MPECs 2017-T43 & 2017-T44 -- 2017 TR1, 2017 SU11, 2017 SP12, 2017 SO17, 2017 SM16, 2017 RR15, 2017 QT35, 2017 FJ90
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2017-T43 -- 2017 RH16, 2016 TR54, 2003 UV11
926Tenagra II Obs. in Arizona, 3 in MPECs 2017-T44, 2017-T45 & 2017-T47 -- 2017 TU1, 2017 TS1, 2017 TR1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-T43 -- 1998 KH9
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 TU1JPL Sentry19302061-2117844.21778113e-05-5.08-5.170JPL: Computed at 12:11 today Pacific time based on 29 observations spanning .76326 days (2017-Oct-10.32694 to 2017-Oct-11.0902). Diameter approximately 0.019 km. from weighted mean H=26.27.
2017 RH16JPL Sentry17322040-21171936.44844071e-05-4.52-4.810JPL: Computed at 10:05 today Pacific time based on 12 observations spanning 5.0759 days (2017-Sep-13.33537 to 2017-Sep-18.411235). Diameter approximately 0.025 km. from weighted mean H=25.66.
2012 TC4NEODyS16282079-211289.67e-05-5.16-5.270NEODyS: "Based on 341 optical observations (of which 11 are rejected as outliers) from 2012-10-04.468 to 2017-10-06.981."
2010 VR139NEODyS16282018-2109795.0e-08-7.96-8.810NEODyS: "Based on 7 optical observations (of which 0 are rejected as outliers) from 2010-11-14.338 to 2010-11-14.402."
2006 SF281JPL Sentry17322019-21163601.3183833e-06-6.18-7.670JPL: Computed at 20:48 April 8th Pacific time based on 16 observations spanning .02717 days (2006-Sep-30.48927 to 2006-Sep-30.51644). Diameter approximately 0.020 km. from weighted mean H=26.13.

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 '17

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

1930Noted that JPL Sentry has posted 2017 TU1 as an impact risk - see above
1916Generated Traffic Report
1732Noted that JPL Sentry has updated its 2006 SF281 risk assessment - see above
Noted that JPL Sentry has updated its 2017 RH16 risk assessment - see above
Noted Radar Astrometry database update - see above
1628Noted that NEODyS has updated its 2010 VR139 risk assessment - see above
Noted that NEODyS has reposted 2012 TC4 as an impact risk - see above
Grabbed MPEC 2017-T43 - Daily Orbit Update - see above
Grabbed MPEC 2017-T44 - 2017 TR1 - see above
Grabbed MPEC 2017-T45 - 2017 TS1 - see above
Grabbed MPEC 2017-T46 - 2017 TT1 - see above
Grabbed MPEC 2017-T47 - 2017 TU1 - see above
Grabbed MPEC 2017-T48 - 2017 TV1 - see above