Contents  on 18 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 18 October '17

Seventeen objects reported inside ten LD

There are seventeen asteroidal objects known to be within ten lunar distances (LD) of our planet today. Nearest are three objects passing through Earth's sphere of gravitational influence (SOI). 2017 UA is outbound from 1.36 to 2.70 LD and comes its closest to the Moon this time around -- 1.67 LD at 0411 UTC. Newly announced risk listed intruder 2017 TD6 is inbound 3.66 to 1.68 LD, and 2017 TE5 moves away from 1.87 to 3.98 LD.

Earth passage I D ~Size Distance Today  Notes
0.13 LD Oct. 122012 TC4 15 m  8.53 to 10.00 LD exits ten LD, intruder, radar/NHATS target, risk - DOU
0.26 LD Oct. 162017 TH5 8 m  3.40 to 6.04 LD intruder
0.50 LD tomorrow2017 TD6 13 m  1.68 from 3.66 LD NEW, enters Earth SOI, intruder, risk - MPEC, DOU
1.19 LD yesterday2017 UA 7 m  1.36 to 2.70 LD exits Earth SOI, Moon closest 1.67 LD at 0411 UTC - DOU
1.34 LD yesterday2017 TE5 22 m  1.87 to 3.98 LD exits Earth SOI - DOU
2.14 LD Oct. 92017 TH2 6 m  9.97 to 11.08 LD exits ten LD
2.76 LD tomorrow2017 UJ 27 m  2.85 from 4.40 LD NEW - MPEC, DOU
3.08 LD yesterday2017 TW5 13 m  3.14 to 5.14 LD risk - DOU
3.4   LD Oct. 222017 TV5 14 m  8.7 from 10.9 LD enters ten LD, uncertainty +/- 15 mins.
4.17 LD Oct. 152017 TK4 10 m  4.60 to 5.06 LD
4.26 LD Oct. 202017 UG 9 m  5.44 from 7.16 LD NEW - MPEC
4.41 LD Oct. 132017 UE 14 m  9.68 to 11.41 LD NEW, exits ten LD - MPEC
4.56 LD today2017 TX5 23 m  4.56 LD Earth closest at 1624 UTC
4.81 LD Oct. 212017 TG4 49 m  8.30 from 10.51 LD enters ten LD
5.52 LD Oct. 222017 TQ5 11 m  7.27 from 8.19 LD
6.63 LD tomorrow2017 TA6 16 m  6.70 from 6.91 LD risk - DOU
8.12 LD yesterday2017 TU3 39 m  8.38 to 9.41 LD

This report was generated at 2310 UTC with seven discoveries announced late yesterday. Four appear in the active traffic table above and the other three have already departed: risk-listed intruder 2017 UF (MPEC) passed Earth at 0.99 LD, and the Moon at 1.83 LD, on October 15th, 2017 UD (MPEC), went by at 3.91 LD the day before, and 2017 TJ6 (MPEC) at 7.07 LD on the 11th. Today's DOU MPEC has the recovery of approaching 444584 2006 UK and observation of five objects in the active table and nine departed objects: 2017 TT4, 2017 TM4, 2017 TH4, 2017 TY3, 2017 TT3 (risk listed), 2017 TL2, 2017 TE1, 2017 RV2 (risk), and 2017 RS2.

Note:  We apologize that our reporting today was significantly delayed due to multiple problems with maintenance, which also caused a brief absence from the Web.

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 - DOU


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 18 October '17

The MPC's NEO Confirmation Page has 80 listings

When last checked at 2343 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 80 objects listed. Of these, 23 were "one nighters." So far The Tracking News has counted a total of 82 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 18 October '17

Minor Planet Electronic Circulars

As of last check at 2343 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-U53 - "16:51 UT" - 2013 UM9


MPEC 2017-U52 - "13:57 UT" - 2014 EK45


MPEC 2017-U51 - "13:41 UT" - 2016 VO1


<< DOU on 18 Oct. '17 >>  MPEC 2017-U50 - "12:12 UT" - Daily Orbit Update

Observers  on 18 October '17

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

CodeObserver / observatory
C97Al-Fulaij Obs., 3 in MPEC 2017-U50 -- 496005, 338292, 333888
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-U53 -- 2013 UM9
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPEC 2017-U50 -- 2017 TY3, 2017 TT4, 2017 TR4, 2017 TM4, 2017 TL2, 2017 TE1, 2017 SV17, 2017 SU20, 2017 SQ12, 2017 SH2, 2017 SG12, 2017 SB21, 2017 RX15, 2017 QX35, 2017 QW32, 2017 PN26, 2014 WO7
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2017-U50 -- 2008 MH1, 1999 AF4
T08ATLAS Mauna Loa in Hawaii, 10 in MPECs 2017-U50 & 2017-U53 -- 2017 MV2, 2017 FJ90, 2013 UM9, 66146, 242211, 16657, 162694, 162117, 154589, 7336
160Castelmartini Obs. in Italy, 11 in MPEC 2017-U50 -- 90075, 68950, 55408, 497176, 496018, 265962, 250458, 220909, 142464, 142040, 11500
703Catalina Sky Survey (CSS) in Arizona, 45 in MPEC 2017-U50 -- 2017 TR1, 2017 TJ4, 2017 TH4, 2017 SP12, 2017 SO17, 2017 SL2, 2017 QT35, 2017 QQ32, 2017 PC27, 2017 FJ90, 2015 KN120, 2011 EB7, 2001 UQ163, 96744, 85709, 65679, 55408, 53319, 496837, 496818, 416584, 411201, 408792, 253586, 23714, 220839, 21374, 190166, 185853, 17181, 162980, 162679, 162566, 15817, 143624, 142464, 141670, 137799, 137199, 11405, 11398, 8035, 7336, 5189, 2201
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-U52 -- 2014 EK45
K87Dettelbach Vineyard Obs. in Germany, 2 in MPEC 2017-U50 -- 2017 TF2, 2017 SN14
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 6 in MPEC 2017-U50 -- 2017 UF, 2017 TT3, 2017 TP2, 2017 TN6, 2017 TH6, 2017 TD6
K88GINOP-KHK in Hungary, 5 in MPEC 2017-U50 -- 2017 TD6, 2017 SO16, 2012 TV78, 444584, 351545
J95Great Shefford Obs. in England, 3 in MPEC 2017-U50 -- 2017 TW5, 2017 TE5, 2017 TA6
134Groszschwabhausen Obs. in Germany, 1 in MPEC 2017-U50 -- 2012 TC4
A17Guidestar Obs. in Germany, 3 in MPEC 2017-U50 -- 2017 SL2, 190208, 143624
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-U53 -- 2013 UM9
246KLENOT in the Czech Republic, 12 in MPEC 2017-U50 -- 2017 TV4, 2017 TR1, 2017 TM2, 2017 TE2, 2017 SY20, 2017 SQ11, 2017 RK1, 2017 QT35, 2017 QQ32, 2017 QL18, 2007 DM41, 2004 RX109
130Lumezzane Obs. in Italy, 1 in MPEC 2017-U50 -- 2012 TC4
K38M57 Obs. in Italy, 2 in MPEC 2017-U50 -- 2014 YC15, 2004 SS
B28Mandi Obs. in Italy, 1 in MPEC 2017-U50 -- 496005
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2017-U50 -- 90075
474Mt. John Obs. in New Zealand, 4 in MPEC 2017-U50 -- 2017 TB4, 2017 SJ20, 2017 SG14, 2015 FH120
G96Mt. Lemmon Survey (MLS) in Arizona, 30 in MPEC 2017-U50 -- 2017 TW3, 2017 SJ14, 2017 SH10, 2017 SF14, 2017 RU, 2017 RK1, 2017 QL35, 2017 PC27, 2016 SG17, 2010 SA12, 2001 UQ163, 96536, 85709, 55408, 496818, 496816, 451003, 414990, 410627, 410622, 408792, 23714, 23548, 20826, 18736, 185853, 162679, 153311, 142464, 138847
K74Muensterschwarzach Obs. in Germany, 2 in MPEC 2017-U50 -- 498548, 496005
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2017-U50 -- 2017 UJ
C23Olmen Obs. in Belgium, 1 in MPEC 2017-U50 -- 3122
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-U50 -- 2017 TA6
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2017-U50 -- 2017 TW3, 2017 SS17, 2017 NU6, 2017 HH, 2008 ET7, 2002 AL14, 441825
291Spacewatch 1.8m telescope in Arizona, 10 in MPEC 2017-U50 -- 2017 TT3, 2017 TS3, 2017 SZ19, 2017 SV19, 2017 SG14, 2017 RV2, 2017 RS2, 2017 RO2, 2017 PL26, 2017 FE1
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-U50 -- 3122
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-U50 -- 498548
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-U50 -- 2017 UA
926Tenagra II Obs. in Arizona, 3 in MPECs 2017-U50 & 2017-U51 -- 2017 UA, 2017 TE5, 2016 VO1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-U50 -- 2017 FR102
L01Visnjan Obs., 1 in MPEC 2017-U50 -- 2017 UJ
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 October '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2343 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 Sentry17302066-208223.069e-07-7.62-7.790JPL: Computed at 08:35 today Pacific time based on 21 observations spanning 1.6605 days (2017-Oct-16.26082 to 2017-Oct-17.92131). Diameter approximately 0.009 km. from weighted mean H=27.89.
NEODyS1730208212.51e-07-7.77-7.770NEODyS: "Based on 18 optical observations (of which 4 are rejected as outliers) from 2017-10-16.262 to 2017-10-17.375."
2017 TD6JPL Sentry17302068-211571.70404674e-05-6.11-6.260JPL: Computed at 08:46 today Pacific time based on 67 observations spanning 6.5150 days (2017-Oct-11.41171 to 2017-Oct-17.926699). Diameter approximately 0.013 km. from weighted mean H=27.15.
2017 TA6JPL Sentry17302049-2116670.000239601792-4.85-5.210JPL: Computed at 09:04 today Pacific time based on 28 observations spanning 1.6981 days (2017-Oct-15.43676 to 2017-Oct-17.134815). Diameter approximately 0.016 km. from weighted mean H=26.57.
2017 TW5JPL Sentry17302072-211554.70244e-06-6.30-6.380JPL: Computed at 08:42 today Pacific time based on 23 observations spanning 1.7751 days (2017-Oct-15.3166 to 2017-Oct-17.09174). Diameter approximately 0.013 km. from weighted mean H=27.06.
NEODyS17302072-2115118.5e-06-6.01-6.040NEODyS: "Based on 20 optical observations (of which 3 are rejected as outliers) from 2017-10-15.317 to 2017-10-16.502."
2017 TT3JPL Sentry17302113-211313.165e-10-10.20-10.20JPL: Computed at 08:54 today Pacific time based on 24 observations spanning 7.5066 days (2017-Oct-10.43768 to 2017-Oct-17.944284). Diameter approximately 0.024 km. from weighted mean H=25.74.
NEODyS17302059-210232.57e-07-7.00-7.010NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2017-10-10.438 to 2017-10-16.276."
2017 TP2JPL Sentry17302090-209019.454e-08-6.97-6.970JPL: Computed at 08:33 today Pacific time based on 23 observations spanning 6.6684 days (2017-Oct-11.17727 to 2017-Oct-17.845679). Diameter approximately 0.043 km. from weighted mean H=24.48.
2017 RV2JPL Sentry17302082-2117420.00010798165-4.94-5.540JPL: Computed at 08:05 today Pacific time based on 133 observations spanning 32.957 days (2017-Sep-14.43497 to 2017-Oct-17.39182). Diameter approximately 0.019 km. from weighted mean H=26.20.
2017 PL26JPL Sentry1730R E M O V E DJPL: Risk listing removed at 1456 UTC today
2017 HZ4NEODyS1730210619.77e-08-7.85-7.850NEODyS: "Based on 57 optical observations (of which 3 are rejected as outliers) from 2017-04-26.445 to 2017-06-18.998."
2017 FR102JPL Sentry1730R E M O V E DJPL: Risk listing removed at 1455 UTC today

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 18 October '17

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

2310Generated Traffic Report
1730Noted that JPL Sentry has removed 2017 FR102 as an impact risk - see above
Noted that NEODyS has updated its 2017 HZ4 risk assessment - see above
Noted that JPL Sentry has removed 2017 PL26 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 RV2 risk assessment - see above
Noted that JPL Sentry has updated its 2017 TA6 risk assessment - see above
Noted that JPL Sentry has updated its 2017 TD6 risk assessment - see above
Noted that JPL Sentry has updated its 2017 TP2 risk assessment - see above
Noted that JPL Sentry has updated its 2017 TT3 risk assessment - see above
Noted that NEODyS has updated its 2017 TT3 risk assessment - see above
Noted that JPL Sentry has updated its 2017 TW5 risk assessment - see above
Noted that NEODyS has posted 2017 TW5 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 UF risk assessment - see above
Noted that NEODyS has posted 2017 UF as an impact risk - see above
Grabbed MPEC 2017-U50 - Daily Orbit Update - see above
Grabbed MPEC 2017-U51 - 2016 VO1 - see above
Grabbed MPEC 2017-U52 - 2014 EK45 - see above
Grabbed MPEC 2017-U53 - 2013 UM9 - see above