Contents  on 8 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 8 October '17

Six objects reported inside ten LD

Six minor objects are reported to be inside ten lunar distances (LD) of our planet today. Nearest are outbound risk-listed 2017 TB, traveling from from 3.12 to 4.39 LD, and 2017 TA, moving from 3.86 to 5.97 LD.

Earth passage I D ~Size Distance Today  Notes
0.13 LD Oct. 122012 TC4 15 m  4.83 from 6.30 LD intruder, radar/NHATS target, risk - DOU
0.23 LD Oct. 22017 SX17 8 m  8.44 to 9.96 LD intruder
1.14 LD Oct. 52017 TB 5 m  3.12 to 4.39 LD risk
2.66 LD Oct. 62017 TA 37 m  3.86 to 5.97 LD
8.93 LD Oct. 112017 SB20 38 m  9.52 from 10.18 LD enters ten LD
8.96 LD Oct. 102017 SN21 21 m  9.40 from 10.05 LD NEW, enters ten LD - MPEC
Approaching (sorted by 10-LD bubble entry date)
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 1615 UTC with the discoveries announced late yesterday of inbound 2017 SN21 (MPEC) and three already departed objects: 2017 TE1 (MPEC), which flew by us at 4.58 LD on September 28th, 2017 SP21 (MPEC) went by at 3.31 LD on the 30th, and 2017 SM21 (MPEC) at 6.01 LD on the 25th. Today's DOU MPEC has follow-up for inbound risk-listed intruder 2012 TC4, which is a NHATS and radar target.

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 8 October '17

The MPC's NEO Confirmation Page has 45 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 45 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 48 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 8 October '17

Minor Planet Electronic Circulars

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

<< DOU on 8 Oct. '17 >>  MPEC 2017-T39 - "12:08 UT" - Daily Orbit Update

MPEC 2017-T38 - "02:01 UT" - Comet C/2017 S7 (Lemmon)

MPEC 2017-T37 - "01:25 UT" - Comet C/2017 S6 (Catalina)

Observers  on 8 October '17

A total of 34 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 3 in MPEC 2017-T39 -- 90075, 142040, 3122
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-T39 -- 2004 RE84
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2017-T39 -- 2017 SO12
T05ATLAS Haleakala in Hawaii, 8 in MPEC 2017-T39 -- 2017 MV2, 503293, 500749, 496981, 495959, 242211, 10115, 7336
T08ATLAS Mauna Loa in Hawaii, 8 in MPEC 2017-T39 -- 87684, 53319, 496817, 496816, 411201, 265962, 190166, 5143
160Castelmartini Obs. in Italy, 15 in MPEC 2017-T39 -- 2004 SS, 96590, 503293, 497176, 337228, 265962, 190208, 162011, 11500, 8567, 8037, 4197, 3361, 3200, 1865
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2017-T37 & 2017-T39 -- C/2017 S6, 500749
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2017-T37 & 2017-T38 -- C/2017 S7, C/2017 S6
J27El Guijo Obs. in Spain, 1 in MPEC 2017-T39 -- 333888
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-T37 -- C/2017 S6
K88GINOP-KHK in Hungary, 2 in MPECs 2017-T37 & 2017-T38 -- C/2017 S7, C/2017 S6
U695Hidetaka Sato in Japan via iTelescope Obs. Auberry in northern California, 2 in MPECs 2017-T37 & 2017-T38 -- C/2017 S7, C/2017 S6
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-T39 -- 2012 TC4
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2017-T39 -- 2012 TC4
Z17LCO Tenerife Aqawan A#2 in the Canary Islands, 1 in MPEC 2017-T38 -- C/2017 S7
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2017-T37, 2017-T38 & 2017-T39 -- C/2017 S7, C/2017 S6, 2012 TC4
118Modra Obs. in Slovakia, 2 in MPECs 2017-T37 & 2017-T38 -- C/2017 S7, C/2017 S6
900Moriyama Obs. in Japan, 1 in MPEC 2017-T37 -- C/2017 S6
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2017-T37 & 2017-T38 -- C/2017 S7, C/2017 S6
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2017-T39 -- 2017 RV1
W55Natelli Obs. in Maryland, 1 in MPEC 2017-T39 -- 498548
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-T37 -- C/2017 S6
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPEC 2017-T39 -- 2017 QV34, 2000 YG29, 1998 SZ27, 53110, 497232, 495959, 376788, 16960, 153249
K63Pascoli Obs. in Italy, 1 in MPEC 2017-T39 -- 496005
D29Purple Mtn. Obs. Xuyi Station in China, 6 in MPEC 2017-T39 -- 496018, 381906, 333888, 143624, 137078, 11500
G40#J.L. Tuten in Arkansas via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-T38 -- C/2017 S7
G409B. Lutkenhoner in Germany via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-T38 -- C/2017 S7
Y00SONEAR in Brazil, 1 in MPEC 2017-T39 -- 5189
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-T38 -- C/2017 S7
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-T39 -- 3122
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-T38 -- C/2017 S7
A71Stixendorf Obs. in Austria, 2 in MPECs 2017-T37 & 2017-T38 -- C/2017 S7, C/2017 S6
926Tenagra II Obs. in Arizona, 14 in MPECs 2017-T37, 2017-T38 & 2017-T39 -- 2017 SZ20, 2017 SY20, 2017 SH10, C/2017 S7, C/2017 S6, 2017 RQ2, 2017 NL6, 2015 UK52, 2002 RN38, 2000 SF8, 496817, 162011, 153249, 137799
I76Tesla Obs. in Spain, 3 in MPEC 2017-T39 -- 2017 RV1, 2017 FJ90, 2014 YC15
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-T39 -- 2011 LH21
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 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.





Notes for Today's Latest Risk Assessments
2012 TC4NEODyS15472079-211289.67e-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."

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 8 October '17

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

1615Generated Traffic Report
1547Noted that NEODyS has updated its 2012 TC4 risk assessment - see above
Grabbed MPEC 2017-T39 - Daily Orbit Update - see above
0347Grabbed MPEC 2017-T37 - Comet C/2017 S6 (Catalina) - see above
Grabbed MPEC 2017-T38 - Comet C/2017 S7 (Lemmon) - see above