Contents  on 17 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 17 October '17

Fifteen objects reported inside ten LD

Today fifteen transient natural objects are known to be less than ten lunar distances (LD) from Earth. Intruder 2017 TH5 starts the day inside the Earth-Moon system, moving away from 0.79 to 3.40 LD from Earth and passing the Moon at 0.55 LD at 0204 UTC. Within Earth's SOI, two other objects come their closest to our planet this time around: newly announced 2017 UA reaching 1.19 LD at 1515 UTC and 2017 TE5 1.34 LD at 1108 UTC (as well as its closest to the Moon -- 1.85 LD at 1857 UTC). And, a little further out, 2017 TW5 comes its nearest -- 3.08 LD at 1936 UTC. The other eleven objects are out beyond four LD.

Earth passage I D ~Size Distance Today  Notes
0.13 LD Oct. 122012 TC4 15 m  7.07 to 8.53 LD intruder, radar/NHATS target - DOU
0.26 LD yesterday2017 TH5 8 m  0.79 to 3.40 LD intruder today, exits Earth SOI, Moon closest 0.55 LD at 0204 UTC - DOU
1.19 LD today2017 UA 6 m  1.19 LD NEW, inside Earth SOI, Earth closest at 1515 UTC - MPEC
1.34 LD today2017 TE5 23 m  1.34 LD inside Earth SOI, Earth closest at 1108 UTC, Moon closest 1.85 at 1857 UTC - DOU
2.14 LD Oct. 92017 TH2 6 m  8.87 to 9.97 LD
2.52 LD Oct. 132017 TT1 12 m  9.60 to 11.92 LD exits ten LD - DOU
3.08 LD today2017 TW5 13 m  3.08 LD Earth closest at 1936 UTC, risk
4.17 LD Oct. 152017 TK4 10 m  4.29 to 4.60 LD
4.56 LD tomorrow2017 TX5 23 m  4.82 from 5.98 LD DOU
5.21 LD Oct. 132017 TU1 20 m  9.63 to 11.65 LD exits ten LD, risk
5.52 LD Oct. 222017 TQ5 11 m  8.19 from 9.21 LD
5.59 LD Oct. 142017 TV1 19 m  8.44 to 10.30 LD exits ten LD - DOU
6.63 LD Oct. 192017 TA6 17 m  6.90 from 7.24 LD risk
6.84 LD Oct. 132017 TU5 12 m  9.24 to 10.51 LD exits ten LD
8.12 LD today2017 TU3 39 m  8.12 LD Earth closest at 0531 UTC

This report was generated at 1936 UTC with the discovery of 2017 UA (MPEC) and with follow-up (in most cases first follow-up) in today's DOU MPEC for seven objects in the accompanying active traffic tables and for five departed objets: 2017 TH4, 2017 TY3, 2017 TS1, 2017 NB7, and risk-listed 2017 TT3. The DOU also has astrometry for departed objects 2017 SA21 and risk-listed 2017 RS2. We note that outbound intruder and radar/NHATS target 2012 TC4 has had the last of its Earth impact solutions removed today.

Approaching (sorted by 10-LD bubble entry date)
4.81 LD Oct. 212017 TG4 49 m  < 10 LD tomorrow - DOU
3.4   LD Oct. 222017 TV5 14 m  < 10 LD tomorrow, uncertainty +/- 15 mins.
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



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 17 October '17

The MPC's NEO Confirmation Page has 77 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 77 objects listed. Of these, 34 were "one nighters." So far The Tracking News has counted a total of 101 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 17 October '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been 21 MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-U49 - "22:31 UT" - 2017 UJ


MPEC 2017-U48 - "22:26 UT" - 2017 UH


MPEC 2017-U47 - "22:22 UT" - 2017 UG


MPEC 2017-U46 - "22:10 UT" - 2017 UF


MPEC 2017-U45 - "22:06 UT" - 2017 UE


MPEC 2017-U44 - "22:01 UT" - 2017 UD


MPEC 2017-U43 - "21:57 UT" - 2017 UC


MPEC 2017-U42 - "21:47 UT" - 2017 TN6


MPEC 2017-U41 - "21:42 UT" - 2017 TM6


MPEC 2017-U40 - "21:38 UT" - 2017 TL6


MPEC 2017-U39 - "21:35 UT" - 2017 TK6


MPEC 2017-U38 - "21:31 UT" - 2017 TJ6


MPEC 2017-U37 - "21:26 UT" - 2017 TH6


MPEC 2017-U36 - "21:22 UT" - 2017 TG6


MPEC 2017-U35 - "21:18 UT" - 2017 TF6


MPEC 2017-U34 - "21:14 UT" - 2017 TE6


MPEC 2017-U33 - "21:10 UT" - 2017 TD6


MPEC 2017-U32 - "20:10 UT" - Job Opportunities at the Minor Planet Center

The International Astronomical Union Minor Planet Center in Cambridge, Mass. USA is inviting applications for two positions: Post-Doctoral Fellowship and Web-Developer.


<< DOU on 17 Oct. '17 >>  MPEC 2017-U31 - "12:05 UT" - Daily Orbit Update


MPEC 2017-U30 - "11:34 UT" - 2017 UA


MPEC 2017-U29 - "00:49 UT" - 2014 JC31

Observers  on 17 October '17

A total of 53 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 35 in MPEC 2017-U31 -- 2017 SO10, 2017 SN10, 2017 SM10, 2017 SH10, 2017 SG10, 2017 SA21, 2017 RY15, 2017 RX15, 2017 RV15, 2017 RV1, 2017 RU15, 2017 RU1, 2017 RU, 2017 RS2, 2017 RR16, 2017 RR15, 2017 RQ2, 2017 RK1, 2017 QV34, 2017 QR16, 2017 QM18, 2017 OP68, 2017 OH68, 2017 OG68, 2017 NU6, 2017 NT6, 2017 NM6, 2017 MO7, 2017 MG3, 2017 KT34, 2017 FJ90, 2014 YY8, 2010 GP67, 501647, 350462
T08ATLAS Mauna Loa in Hawaii, 6 in MPECs 2017-U31 & 2017-U49 -- 2017 UJ, 2017 RL, 2014 YC15, 2014 UR116, 2004 SS, 496005
C77Bernezzo Obs. in Italy, 2 in MPEC 2017-U31 -- 2014 UR116, 2004 SS
B75Betelgeuse Station in Italy, 1 in MPEC 2017-U31 -- 2014 YC15
073Bucharest Obs. in Romania, 1 in MPEC 2017-U31 -- 2012 TC4
160Castelmartini Obs. in Italy, 11 in MPECs 2017-U31, 2017-U33, 2017-U44 & 2017-U49 -- 2017 UJ, 2017 UD, 2017 TX5, 2017 TD6, 90075, 68950, 55408, 497176, 496018, 220909, 142040
703Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2017-U31, 2017-U33 & 2017-U45 -- 2017 UE, 2017 TG5, 2017 TG4, 2017 TD6, 2017 SY20, 2017 SS17, 2017 SQ11, 2017 SO16, 2017 QL18, 495511
107Cavezzo Obs. in Italy, 1 in MPEC 2017-U31 -- 2017 TK1
K51Celado Obs. in Italy, 4 in MPECs 2017-U31, 2017-U36, 2017-U44 & 2017-U49 -- 2017 UJ, 2017 UD, 2017 TS5, 2017 TG6
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2017-U31 -- 2017 SK2, 2017 RM15, 2017 QW34
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-U33 -- 2017 TD6
113Drebach Obs. in Germany, 2 in MPECs 2017-U31 & 2017-U44 -- 2017 UD, 2014 UR116
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2017-U31 -- 2016 SL3
006Fabra Obs. in Spain, 1 in MPEC 2017-U31 -- 2012 TC4
K83Forti Obs., 2 in MPEC 2017-U31 -- 496818, 496816
D08Ghezz Obs. in Switzerland, 1 in MPEC 2017-U31 -- 338292
K88GINOP-KHK in Hungary, 9 in MPECs 2017-U33, 2017-U36, 2017-U37, 2017-U39, 2017-U41, 2017-U42, 2017-U43, 2017-U44 & 2017-U49 -- 2017 UJ, 2017 UD, 2017 UC, 2017 TN6, 2017 TM6, 2017 TK6, 2017 TH6, 2017 TG6, 2017 TD6
J95Great Shefford Obs. in England, 7 in MPECs 2017-U30, 2017-U31, 2017-U43, 2017-U45, 2017-U47 & 2017-U48 -- 2017 UH, 2017 UG, 2017 UE, 2017 UC, 2017 UA, 2017 TE5, 496005
A17Guidestar Obs. in Germany, 2 in MPECs 2017-U31 & 2017-U33 -- 2017 TN2, 2017 TD6
246KLENOT in the Czech Republic, 12 in MPECs 2017-U31, 2017-U33, 2017-U36, 2017-U39, 2017-U42, 2017-U44, 2017-U45, 2017-U46, 2017-U47 & 2017-U49 -- 2017 UJ, 2017 UG, 2017 UF, 2017 UE, 2017 UD, 2017 TN6, 2017 TN2, 2017 TK6, 2017 TG6, 2017 TD6, 2014 UR116, 2004 SS
Z43Landehen Obs., 1 in MPEC 2017-U31 -- 2014 YC15
598Loiano Obs. in Italy, 1 in MPEC 2017-U31 -- 2012 TC4
K38M57 Obs. in Italy, 2 in MPECs 2017-U31 & 2017-U42 -- 2017 TN6, 2017 TG2
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-U31 -- 2012 TC4
K32Maritime Alps Obs. in Italy, 1 in MPEC 2017-U31 -- 496005
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-U31 -- 2006 KA40
B67Mirasteilas Obs. in Switzerland, 4 in MPEC 2017-U31 -- 2017 TK1, 2017 RR15, 2004 SS, 1998 WP7
474Mt. John Obs. in New Zealand, 10 in MPEC 2017-U31 -- 2017 TJ4, 2017 TH5, 2017 TH4, 2017 TE5, 2017 TB4, 2017 TA4, 2017 SC14, 2015 SA17, 2011 CX7, 2010 VZ71
G96Mt. Lemmon Survey (MLS) in Arizona, 34 in MPECs 2017-U30, 2017-U31, 2017-U33, 2017-U34, 2017-U35, 2017-U36, 2017-U37, 2017-U38, 2017-U39, 2017-U40, 2017-U41, 2017-U42, 2017-U43, 2017-U44, 2017-U46, 2017-U47 & 2017-U48 -- 2017 UH, 2017 UG, 2017 UF, 2017 UD, 2017 UC, 2017 UA, 2017 TY3, 2017 TS1, 2017 TR1, 2017 TN6, 2017 TN2, 2017 TM6, 2017 TM2, 2017 TL6, 2017 TK6, 2017 TJ6, 2017 TJ4, 2017 TH6, 2017 TH5, 2017 TG6, 2017 TF6, 2017 TE6, 2017 TD6, 2017 SY20, 2017 SV19, 2017 SS19, 2017 SM10, 2017 SL2, 2017 RL16, 2017 QT35, 2017 QQ32, 2017 PT25, 2017 OG68, 2017 KS31
628Mulheim-Ruhr Obs. in Germany, 1 in MPEC 2017-U31 -- 2009 SP171
A13Naef Obs. in Switzerland, 2 in MPEC 2017-U31 -- 2017 TR1, 2017 TE2
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-U31 -- 3122
G34Oberfrauendorf Obs. in Germany, 5 in MPEC 2017-U31 -- 2017 TJ4, 2017 TE5, 2014 YC15, 2014 UR116, 496005
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2017-U31, 2017-U33 & 2017-U37 -- 2017 TH6, 2017 TD6, 326388
K63Pascoli Obs. in Italy, 7 in MPECs 2017-U37, 2017-U39, 2017-U42, 2017-U44, 2017-U45, 2017-U46 & 2017-U49 -- 2017 UJ, 2017 UF, 2017 UE, 2017 UD, 2017 TN6, 2017 TK6, 2017 TH6
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 11 in MPEC 2017-U31 -- 2017 TR1, 2017 TK1, 2017 TG2, 2017 TE2, 2017 SN2, 2017 RR15, 2017 PJ26, 2014 YC15, 2004 SS, 90075, 496005
122Pises Obs. in France, 3 in MPEC 2017-U31 -- 2017 SS19, 2013 RE21, 456651
W25RMS Obs., 3 in MPECs 2017-U39, 2017-U45 & 2017-U49 -- 2017 UJ, 2017 UE, 2017 TK6
L04ROASTERR-1 in Romania, 5 in MPECs 2017-U31, 2017-U33 & 2017-U49 -- 2017 UJ, 2017 TD6, 2014 YC15, 2014 UR116, 496005
104San Marcello Pistoiese Obs. in Italy, 7 in MPECs 2017-U30, 2017-U33, 2017-U38, 2017-U39, 2017-U43, 2017-U44 & 2017-U49 -- 2017 UJ, 2017 UD, 2017 UC, 2017 UA, 2017 TK6, 2017 TJ6, 2017 TD6
H36Sandlot Obs. in Kansas, 4 in MPECs 2017-U36, 2017-U37, 2017-U41 & 2017-U43 -- 2017 UC, 2017 TM6, 2017 TH6, 2017 TG6
204Schiaparelli Obs. in Italy, 3 in MPECs 2017-U33, 2017-U41 & 2017-U49 -- 2017 UJ, 2017 TM6, 2017 TD6
K14Sencelles Obs. in Spain, 1 in MPEC 2017-U31 -- 3122
691Spacewatch 0.9m telescope in Arizona, 17 in MPECs 2017-U31 & 2017-U33 -- 2017 TT3, 2017 TD6, 2017 SY11, 2017 SX11, 2017 SV20, 2017 SV19, 2017 SR12, 2017 SL17, 2017 SL14, 2017 SF14, 2017 RL16, 2017 RH15, 2017 QM18, 2017 QL33, 2017 PR25, 2017 GS6, 2007 TF68
291Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2017-U31 -- 2017 TS3, 2017 ST17, 2017 SG14, 2017 NB7, 2016 AU8, 2015 XK1, 2013 GW79, 2013 BE19
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-U31 -- 3122
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-U49 -- 2017 UJ
I52Steward Obs. Mt. Lemmon Station in Arizona, 17 in MPECs 2017-U30, 2017-U33, 2017-U34, 2017-U35, 2017-U36, 2017-U37, 2017-U38, 2017-U39, 2017-U40, 2017-U41, 2017-U42, 2017-U43, 2017-U44, 2017-U45, 2017-U46, 2017-U47 & 2017-U48 -- 2017 UH, 2017 UG, 2017 UF, 2017 UE, 2017 UD, 2017 UC, 2017 UA, 2017 TN6, 2017 TM6, 2017 TL6, 2017 TK6, 2017 TJ6, 2017 TH6, 2017 TG6, 2017 TF6, 2017 TE6, 2017 TD6
926Tenagra II Obs. in Arizona, 13 in MPECs 2017-U29, 2017-U30, 2017-U31, 2017-U34, 2017-U36, 2017-U39, 2017-U40, 2017-U41, 2017-U42, 2017-U45 & 2017-U49 -- 2017 UJ, 2017 UE, 2017 UA, 2017 TV1, 2017 TT1, 2017 TN6, 2017 TM6, 2017 TL6, 2017 TK6, 2017 TH5, 2017 TG6, 2017 TE6, 2014 JC31
A16Tentlingen Obs. in Switzerland, 2 in MPEC 2017-U31 -- 5143, 3288
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-U31 -- 2017 HZ4
718Wiggins Obs. in Utah, 1 in MPEC 2017-U49 -- 2017 UJ
C51WISE in Earth polar orbit, 1 in MPEC 2017-U31 -- 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 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 UFJPL Sentry23582066-208221.7625e-07-7.86-8.160JPL: Computed at 16:50 today Pacific time based on 18 observations spanning 1.1138 days (2017-Oct-16.26082 to 2017-Oct-17.37463). Diameter approximately 0.009 km. from weighted mean H=27.86.
2017 TD6JPL Sentry23262051-211582.95614263e-05-5.93-6.020JPL: Computed at 16:03 today Pacific time based on 56 observations spanning 5.8979 days (2017-Oct-11.41171 to 2017-Oct-17.30961). Diameter approximately 0.012 km. from weighted mean H=27.24.
2017 TA5NEODyS15012080-2117357.43e-06-6.50-7.160NEODyS: "Based on 17 optical observations (of which 5 are rejected as outliers) from 2017-10-13.241 to 2017-10-15.283."
2017 TT3JPL Sentry16042059-211337.81483e-07-6.49-6.490JPL: Computed at 08:39 today Pacific time based on 19 observations spanning 5.8376 days (2017-Oct-10.43768 to 2017-Oct-16.27527). Diameter approximately 0.024 km. from weighted mean H=25.76.
2017 TS3JPL Sentry1532R E M O V E DJPL: Risk listing removed at 1528 UTC today
2017 SA21JPL Sentry15012056-205611.672e-07-8.32-8.320JPL: Computed at 07:51 today Pacific time based on 32 observations spanning 2.0206 days (2017-Sep-29.34186 to 2017-Oct-01.3625). Diameter approximately 0.007 km. from weighted mean H=28.32.
2017 SU17NEODyS15012053-2117784.1e-05-6.13-6.790NEODyS: "Based on 31 optical observations (of which 2 are rejected as outliers) from 2017-09-26.445 to 2017-10-01.274."
2017 HZ4JPL Sentry15322091-210628.166e-07-6.89-7.170JPL: Computed at 08:06 today Pacific time based on 56 observations spanning 53.553 days (2017-Apr-26.44436 to 2017-Jun-18.997168). Diameter approximately 0.023 km. from weighted mean H=25.86.
NEODyS15012106-211728.31e-08-7.92-7.920NEODyS: "Based on 54 optical observations (of which 3 are rejected as outliers) from 2017-04-26.445 to 2017-06-18.998."
2012 TC4NEODyS1501R E M O V E D-

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 17 October '17

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

2358Noted that JPL Sentry has posted 2017 UF as an impact risk - see above
2326Noted that JPL Sentry has posted 2017 TD6 as an impact risk - see above
2258Grabbed MPEC 2017-U49 - 2017 UJ - see above
2230Grabbed MPEC 2017-U33 - 2017 TD6 - see above
Grabbed MPEC 2017-U34 - 2017 TE6 - see above
Grabbed MPEC 2017-U35 - 2017 TF6 - see above
Grabbed MPEC 2017-U36 - 2017 TG6 - see above
Grabbed MPEC 2017-U37 - 2017 TH6 - see above
Grabbed MPEC 2017-U38 - 2017 TJ6 - see above
Grabbed MPEC 2017-U39 - 2017 TK6 - see above
Grabbed MPEC 2017-U40 - 2017 TL6 - see above
Grabbed MPEC 2017-U41 - 2017 TM6 - see above
Grabbed MPEC 2017-U42 - 2017 TN6 - see above
Grabbed MPEC 2017-U43 - 2017 UC - see above
Grabbed MPEC 2017-U44 - 2017 UD - see above
Grabbed MPEC 2017-U45 - 2017 UE - see above
Grabbed MPEC 2017-U46 - 2017 UF - see above
Grabbed MPEC 2017-U47 - 2017 UG - see above
Grabbed MPEC 2017-U48 - 2017 UH - see above
2101Grabbed MPEC 2017-U32 - Job Opportunities at the Minor Planet Center - see above
1936Generated Traffic Report
1604Noted that JPL Sentry has updated its 2017 TT3 risk assessment - see above
1532Noted that JPL Sentry has updated its 2017 HZ4 risk assessment - see above
Noted that JPL Sentry has removed 2017 TS3 as an impact risk - see above
1501Noted that NEODyS has removed 2012 TC4 as an impact risk - see above
Noted that NEODyS has updated its 2017 HZ4 risk assessment - see above
Noted that JPL Sentry has updated its 2017 SA21 risk assessment - see above
Noted that NEODyS has updated its 2017 SU17 risk assessment - see above
Noted that NEODyS has posted 2017 TA5 as an impact risk - see above
1500Grabbed MPEC 2017-U30 - 2017 UA - see above
Grabbed MPEC 2017-U31 - Daily Orbit Update - see above
0202Grabbed MPEC 2017-U29 - 2014 JC31 - see above