Contents  on 13 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 13 October '17

Ten objects reported inside ten LD

Ten asteroidal objects are known to be within ten lunar distances (LD) of Earth today. Nearest is the intruder and risk-listed radar/NHATS target 2012 TC4, which began the day less than one LD from the Moon as it moves away from 1.17 to 2.65 LD from Earth. Much further out, unrecovered NHATS target 2005 TE49 may be coming its closest to our planet on this passage, currently calculated to be 8.5 LD at 1825 UTC, but with an uncertainty of plus-or-minus 10.12 hours.

Earth passage I D ~Size Distance Today  Notes
0.13 LD yesterday2012 TC4 15 m  1.17 to 2.65 LD intruder, exits Earth SOI radar/NHATS target, risk - DOU
1.14 LD Oct. 52017 TB 5 m  9.66 to 11.00 LD exits ten LD, risk
2.14 LD Oct. 92017 TH2 6 m  4.64 to 5.66 LD NEW - MPEC
2.52 LD today2017 TT1 12 m  2.52 LD Earth closest at 0312 UTC - DOU
4.93 LD today2017 TK2 24 m  4.93 LD NEW, Earth closest at 0608 UTC - MPEC
5.21 LD today2017 TU1 20 m  5.21 LD Earth closest at 1219 UTC, risk - DOU
5.59 LD tomorrow2017 TV1 19 m  5.62 from 6.33 LD
8.5   LD today2005 TE49 15 m  8.5 LD Earth closest at 1825 UTC, uncertainty +/- 10.1167 hours, NHATS target
8.93 LD Oct. 112017 SB20 36 m  9.45 to 10.08 LD exits ten LD
8.96 LD Oct. 102017 SN21 21 m  9.80 to 10.59 LD exits ten 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 1915 UTC with three discoveries announced late yesterday -- two seen in the accompanying active traffic table and already departed 2017 TL2 (MPEC), which flew by us at 6.27 LD on October 7th. Today's DOU MPEC has first follow-up for departed 2017 TS1 and continuing follow-up for 2017 TU1, 2017 TT1, 2012 TC4, 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 now 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 13 October '17

The MPC's NEO Confirmation Page has 84 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 84 objects listed. Of these, 22 were "one nighters." So far The Tracking News has counted a total of 112 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 13 October '17

Minor Planet Electronic Circulars

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


MPEC 2017-T64 - "16:08 UT" - 2017 SY32


MPEC 2017-T63 - "15:53 UT" - 2017 SS32


MPEC 2017-T62 - "15:46 UT" - 2017 SR32


<< DOU on 13 Oct. '17 >>  MPEC 2017-T61 - "12:05 UT" - Daily Orbit Update

Observers  on 13 October '17

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
K40Altdorf Obs. in Germany, 1 in MPEC 2017-T61 -- 2012 TC4
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-T61 -- 2011 EB7
T08ATLAS Mauna Loa in Hawaii, 6 in MPEC 2017-T61 -- 2017 PJ26, 500749, 498548, 338292, 326388, 190208
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-T61 -- 2017 TN2
215Buchloe Obs. in Germany, 1 in MPEC 2017-T61 -- 2012 TC4
160Castelmartini Obs. in Italy, 6 in MPEC 2017-T61 -- 2012 TC4, 96631, 68950, 55408, 497176, 333888
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2017-T61 -- 2017 TN2, 2017 TE2
203GiaGa Obs. in Italy, 2 in MPEC 2017-T61 -- 2017 TU1, 2017 TJ2
K88GINOP-KHK in Hungary, 1 in MPEC 2017-T61 -- 2017 TS1
J95Great Shefford Obs. in England, 4 in MPEC 2017-T61 -- 2017 TU1, 2017 TT1, 2017 TS1, 2017 TM2
J81Guirguillano Obs. in Spain, 1 in MPEC 2017-T61 -- 496005
G48Harlingten Research Obs. in New Mexico, 2 in MPEC 2017-T61 -- 2017 RR15, 2014 YC15
K78Iota Scorpii Obs., 1 in MPEC 2017-T61 -- 2012 TC4
987Isle of Man Obs. on the Isle of Man, 1 in MPEC 2017-T61 -- 2012 TC4
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-T61 -- 2329
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2017-T64 -- 2017 SY32
K93LCO Sutherland C in South Africa, 1 in MPEC 2017-T61 -- 2012 TC4
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-T64 -- 2017 SY32
K95MASTER-II Sutherland in South Africa, 2 in MPEC 2017-T61 -- 17511, 154268
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-T62 -- 2017 SR32
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2017-T61 -- 2012 TC4
474Mt. John Obs. in New Zealand, 2 in MPECs 2017-T62 & 2017-T63 -- 2017 SS32, 2017 SR32
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPEC 2017-T61 -- 2017 TS1, 2017 TB1, 2017 SW14, 2017 RX15, 2017 PS25, 2017 PB27, 501647, 471956, 392211, 26663, 190788
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2017-T61, 2017-T62 & 2017-T63 -- 2017 SS32, 2017 SR32, 2017 JU2, 427499, 420286
D29Purple Mtn. Obs. Xuyi Station in China, 11 in MPEC 2017-T61 -- 2017 OQ68, 2017 HH, 2003 UV11, 499307, 495511, 30825, 162998, 152667, 143404, 8037, 3361
V83Rolling Hills Obs. in Missouri, 2 in MPEC 2017-T61 -- 2012 TC4, 3122
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-T61 -- 2017 TS1
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-T61 -- 2017 TM2
K14Sencelles Obs. in Spain, 1 in MPEC 2017-T61 -- 2017 TK1
Y00SONEAR in Brazil, 1 in MPEC 2017-T61 -- 66146
587Sormano Obs. in Italy, 1 in MPEC 2017-T61 -- 2012 TC4
691Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2017-T61 -- 2017 SL17, 2017 SH10, 2017 RL15, 2017 QL35, 2017 QJ18, 2012 UU136, 2011 EB7, 496837, 2201
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2017-T61 & 2017-T64 -- 2017 TF1, 2017 SY32, 2017 SV20, 2017 SF14, 2017 MA, 2017 HY50, 2017 BP31, 2016 UP41, 2003 UV11
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-T61 -- 3122
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-T61 -- 2012 TC4
926Tenagra II Obs. in Arizona, 11 in MPECs 2017-T61 & 2017-T64 -- 2017 TT1, 2017 SY32, 2017 ST11, 2017 SO14, 2017 SN16, 2017 RL, 2015 UM67, 2014 UV33, 2012 TK123, 2011 EB7, 2005 RQ6
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-T61 -- 2015 KN120, 2011 OR15
198Wildberg Obs. in Germany, 1 in MPEC 2017-T61 -- 2012 TC4
C51WISE in Earth polar orbit, 1 in MPEC 2017-T64 -- 2017 SY32
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 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 Sentry16192070-2116114.40569e-06-6.19-6.700JPL: Computed at 08:41 today Pacific time based on 37 observations spanning 2.5792 days (2017-Oct-10.32694 to 2017-Oct-12.90617). Diameter approximately 0.020 km. from weighted mean H=26.18.
2017 RH16NEODyS16192044-2117361.35e-05-5.35-5.370NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2017-09-13.336 to 2017-09-18.412."

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 13 October '17

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

1915Generated Traffic Report
1619Noted that NEODyS has updated its 2017 RH16 risk assessment - see above
Noted that JPL Sentry has updated its 2017 TU1 risk assessment - see above
Grabbed MPEC 2017-T61 - Daily Orbit Update - see above
Grabbed MPEC 2017-T62 - 2017 SR32 - see above
Grabbed MPEC 2017-T63 - 2017 SS32 - see above
Grabbed MPEC 2017-T64 - 2017 SY32 - see above