Contents  on 22 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 22 October '17

Eighteen objects reported inside ten LD

There are eighteen Solar-System small bodies reported to be within ten lunar distances (LD) of Earth today. Nearest is newly announced risk-listed intruder 2017 UJ2, which exits Earth's SOI as it moves away from 1.77 to 2.97 LD. This tiny object flew by our planet at 0.047 LD on October 20th, the sixth closest passage of an object observed by telescope that didn't actually hit. Two other objects have been caught inside 0.100 LD so far this year: 2017 EA at 0.054 LD on March 2nd and 2017 GM at 0.042 LD April 4th.

Earth passage I D ~Size Distance Today  Notes
0.05 LD Oct. 202017 UJ2 2 m  1.77 to 2.97 LD NEW, exits Earth SOI, intruder, risk - MPEC
0.50 LD Oct. 192017 TD6 13 m  4.52 to 6.54 LD intruder, risk
1.19 LD Oct. 172017 UA 7 m  7.84 to 9.59 LD
1.97 LD Oct. 162017 UU1 14 m  6.64 to 7.86 LD DOU
2.10 LD Oct. 242017 UU2 18 m  5.04 from 7.42 LD NEW - MPEC
2.76 LD Oct. 192017 UJ 26 m  7.86 to 10.43 LD exits ten LD
3.37 LD today2017 TV5 15 m  3.37 LD Earth closest at 0740 UTC - DOU
4.18 LD Oct. 152017 TK4 10 m  7.02 to 7.79 LD DOU
4.27 LD Oct. 202017 UG 11 m  5.68 to 7.46 LD
4.56 LD Oct. 182017 TX5 22 m  8.87 to 10.90 LD exits ten LD
4.80 LD yesterday2017 TG4 48 m  4.90 to 5.95 LD DOU
4.94 LD yesterday2017 UH1 21 m  6.03 to 9.72 LD
5.50 LD today2017 TQ5 11 m  5.50 LD Earth closest 1403 UTC
5.77 LD today171576 1999 VP11 645 m  5.77 LD Earth closest 1101 UTC
5.95 LD today2017 UQ2 22 m  5.95 LD NEW, Earth closest 1604 UTC - MPEC
6.64 LD Oct. 192017 TA6 16 m  6.95 to 7.30 LD risk
6.95 LD yesterday2017 UM1 25 m  7.03 to 8.50 LD
7.46 LD today2017 US 22 m  7.46 LD Earth closest 2053 UTC, risk - DOU
Approaching
8.66 LD Nov. 17444584 2006 UK 309 m  < 10 LD Nov. 16 - DOU

This report was generated at 2126 UTC with six discoveries. Three are in the above active traffic table (2017 UU2, 2017 UQ2, and 2017 UJ2) and the other three have already departed: Intruder 2017 UR2 (MPEC) went by us at 0.83 LD on October 17th, 2017 US2 (MPEC) passed at around 2.6 LD on October 9th (+/- 44 minutes uncertainty), and 2017 UN2 (MPEC) came to 2.38 LD on October 14th. Today's DOU MPEC has first follow up for 2017 UU1, risk-listed 2017 US, and departed objects 2017 UU and 2017 TV3, along with continuing follow-up for 2017 TV5, 2017 TK4, 2017 TG4, 444584 2006 UK, and departed 2017 TS1, as well as distant 2003 UV11.

Editor's note:  This Web site will be updating less often for a few days and, especially at the current discovery rate, we may not be able to post traffic reports on some days. Nothing will be lost except possibly some NEOCP counts and interim risk analyses. Also, please note that we usually post key information about new discoveries to our close-passer ephemerides page long before they appear in the traffic report. Even non-observers can use that page as a heads-up for pending news.



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 currently 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 22 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, 51 were "one nighters." So far The Tracking News has counted a total of 95 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 22 October '17

Minor Planet Electronic Circulars

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


MPEC 2017-U167 - "14:45 UT" - 2017 UU2


MPEC 2017-U166 - "14:41 UT" - 2017 UT2


MPEC 2017-U165 - "14:38 UT" - 2017 US2


MPEC 2017-U164 - "14:35 UT" - 2017 UR2


MPEC 2017-U163 - "14:31 UT" - 2017 UN2


MPEC 2017-U162 - "14:26 UT" - 2017 UQ2


MPEC 2017-U161 - "14:21 UT" - 2017 UP2


MPEC 2017-U160 - "14:17 UT" - 2017 UO2


MPEC 2017-U159 - "14:11 UT" - 2017 UM2


MPEC 2017-U158 - "14:07 UT" - 2017 UL2


MPEC 2017-U157 - "14:02 UT" - 2017 UK2


MPEC 2017-U156 - "13:57 UT" - 2017 SN33


<< DOU on 22 Oct. '17 >>  MPEC 2017-U155 - "12:05 UT" - Daily Orbit Update


MPEC 2017-U154 - "11:45 UT" - 2017 UJ2

Observers  on 22 October '17

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPECs 2017-U154, 2017-U157, 2017-U158, 2017-U159, 2017-U160, 2017-U162, 2017-U163 & 2017-U167 -- 2017 UU2, 2017 UQ2, 2017 UO2, 2017 UN2, 2017 UM2, 2017 UL2, 2017 UK2, 2017 UJ2
T08ATLAS Mauna Loa in Hawaii, 16 in MPECs 2017-U155 & 2017-U164 -- 2017 UR2, 2017 PS30, 2017 OD1, 2017 FJ90, 66146, 495959, 483560, 242211, 16657, 162694, 15817, 154589, 137199, 11405, 10115, 7336
I47Auger Obs. in Argentina, 1 in MPEC 2017-U155 -- 2017 QV34
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-U156 -- 2017 SN33
V03Big Water Obs. in Utah, 1 in MPEC 2017-U154 -- 2017 UJ2
B96Brixiis Obs. in Belgium, 1 in MPEC 2017-U156 -- 2017 SN33
073Bucharest Obs. in Romania, 1 in MPEC 2017-U155 -- 2003 UV11
215Buchloe Obs. in Germany, 1 in MPEC 2017-U156 -- 2017 SN33
Z84Calar Alto Schmidt in Spain, 3 in MPECs 2017-U154, 2017-U156 & 2017-U167 -- 2017 UU2, 2017 UJ2, 2017 SN33
160Castelmartini Obs. in Italy, 21 in MPECs 2017-U155 & 2017-U156 -- 2017 TG4, 2017 SN33, 2017 QQ32, 2017 QL18, 2008 AX28, 2003 UV11, 99907, 85628, 53319, 496817, 496816, 495858, 337228, 253586, 17511, 17182, 162273, 162011, 159399, 143404, 8037
703Catalina Sky Survey (CSS) in Arizona, 29 in MPECs 2017-U154, 2017-U155, 2017-U156, 2017-U161 & 2017-U162 -- 2017 US, 2017 UQ2, 2017 UP2, 2017 UJ2, 2017 TR1, 2017 TL4, 2017 SN33, 2017 SL2, 2017 QL18, 2017 HH, 2012 TV78, 2003 UV11, 85839, 85628, 499307, 498143, 497176, 495511, 444584, 338292, 338176, 265962, 162998, 159399, 11500, 8567, 8037, 3361, 1865
A77Chante-Perdrix Obs. in France, 1 in MPEC 2017-U156 -- 2017 SN33
K26Contern Obs. in Luxembourg, 1 in MPEC 2017-U155 -- 3122
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2017-U156 & 2017-U161 -- 2017 UP2, 2017 SN33
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2017-U161 -- 2017 UP2
K87Dettelbach Vineyard Obs. in Germany, 2 in MPECs 2017-U156 & 2017-U161 -- 2017 UP2, 2017 SN33
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 5 in MPECs 2017-U156, 2017-U159, 2017-U161, 2017-U162 & 2017-U164 -- 2017 UR2, 2017 UQ2, 2017 UP2, 2017 UM2, 2017 SN33
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-U156 -- 2017 SN33
K88GINOP-KHK in Hungary, 1 in MPEC 2017-U156 -- 2017 SN33
J95Great Shefford Obs. in England, 1 in MPEC 2017-U163 -- 2017 UN2
A17Guidestar Obs. in Germany, 1 in MPEC 2017-U156 -- 2017 SN33
H06iTelescope Obs. Mayhill in New Mexico, 2 in MPECs 2017-U155 & 2017-U156 -- 2017 SN33, 2003 UV11
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-U156 -- 2017 SN33
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-U156 -- 2017 SN33
585Kiev Comet Station in Ukraine, 1 in MPEC 2017-U156 -- 2017 SN33
246KLENOT in the Czech Republic, 3 in MPECs 2017-U161, 2017-U162 & 2017-U164 -- 2017 UR2, 2017 UQ2, 2017 UP2
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2017-U166 & 2017-U167 -- 2017 UU2, 2017 UT2
C10Maisoncelles Obs. in France, 1 in MPEC 2017-U156 -- 2017 SN33
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-U156 -- 2017 SN33
118Modra Obs. in Slovakia, 1 in MPEC 2017-U156 -- 2017 SN33
G96Mt. Lemmon Survey (MLS) in Arizona, 30 in MPECs 2017-U154, 2017-U155, 2017-U156, 2017-U157, 2017-U158, 2017-U159, 2017-U163, 2017-U164, 2017-U165, 2017-U166 & 2017-U167 -- 2017 UU2, 2017 UT2, 2017 US2, 2017 UR2, 2017 UN2, 2017 UM2, 2017 UL2, 2017 UK2, 2017 UJ2, 2017 TS1, 2017 TO2, 2017 TK6, 2017 SY11, 2017 SX11, 2017 SN33, 2016 TE93, 2015 BF4, 2011 VQ5, 2008 AX28, 2001 UF18, 85839, 501647, 498143, 392211, 333888, 19764, 164211, 142563, 138175, 2212
C47Nonndorf Obs. in Austria, 1 in MPEC 2017-U156 -- 2017 SN33
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2017-U155, 2017-U156 & 2017-U160 -- 2017 UO2, 2017 SN33, 2005 UJ159, 2001 UQ163, 433960, 141670
K63Pascoli Obs. in Italy, 1 in MPEC 2017-U156 -- 2017 SN33
B49Paus Obs. in Spain, 1 in MPEC 2017-U156 -- 2017 SN33
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2017-U156 -- 2017 SN33
D29Purple Mtn. Obs. Xuyi Station in China, 8 in MPEC 2017-U155 -- 2017 QL18, 2017 OQ68, 2015 BF4, 85818, 53319, 21374, 11405, 1865
W25RMS Obs., 2 in MPECs 2017-U156 & 2017-U164 -- 2017 UR2, 2017 SN33
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2017-U161 -- 2017 UP2
104San Marcello Pistoiese Obs. in Italy, 4 in MPECs 2017-U156, 2017-U161, 2017-U162 & 2017-U164 -- 2017 UR2, 2017 UQ2, 2017 UP2, 2017 SN33
A29Santa Maria a Monte Obs. in Italy, 1 in MPEC 2017-U156 -- 2017 SN33
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2017-U155 -- 2017 QO36
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-U161 -- 2017 UP2
033Schwarzschild Obs. in Germany, 1 in MPEC 2017-U156 -- 2017 SN33
0948program code 8 via Simeis Obs. in Ukraine, 1 in MPEC 2017-U156 -- 2017 SN33
G40"G. Gasparovic in Croatia via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-U156 -- 2017 SN33
G40#J.L. Tuten in Arkansas via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-U156 -- 2017 SN33
G40&program code "&" (15) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-U156 -- 2017 SN33
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-U156 -- 2017 SN33
587Sormano Obs. in Italy, 1 in MPEC 2017-U156 -- 2017 SN33
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2017-U155, 2017-U156 & 2017-U158 -- 2017 UL2, 2017 TE2, 2017 SN33, 29075
291Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2017-U155, 2017-U156, 2017-U157, 2017-U159, 2017-U160 & 2017-U164 -- 2017 UR2, 2017 UO2, 2017 UM2, 2017 UK2, 2017 SN33, 2008 EL, 2005 JB, 1999 VM11
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-U155 -- 3122
I52Steward Obs. Mt. Lemmon Station in Arizona, 17 in MPECs 2017-U155, 2017-U156, 2017-U157, 2017-U158, 2017-U159, 2017-U161, 2017-U163, 2017-U164, 2017-U165, 2017-U166 & 2017-U167 -- 2017 UU2, 2017 UT2, 2017 US2, 2017 UR2, 2017 UP2, 2017 UN2, 2017 UM2, 2017 UL2, 2017 UK2, 2017 UC1, 2017 TT6, 2017 TQ6, 2017 TN2, 2017 TJ4, 2017 TG5, 2017 SN33, 2014 WG365
A71Stixendorf Obs. in Austria, 1 in MPEC 2017-U156 -- 2017 SN33
926Tenagra II Obs. in Arizona, 18 in MPECs 2017-U155, 2017-U156, 2017-U158, 2017-U160, 2017-U161, 2017-U162, 2017-U164 & 2017-U166 -- 2017 UU1, 2017 UU, 2017 UT2, 2017 UR2, 2017 UQ2, 2017 UP2, 2017 UO2, 2017 UO1, 2017 UL2, 2017 UH, 2017 UC, 2017 TV5, 2017 TV3, 2017 TO4, 2017 TK4, 2017 TG4, 2017 TF2, 2017 SN33
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-U155 -- 2017 FC3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 UJ2NEODyS18462077-2112127.37e-07-9.31-9.640NEODyS: "Based on 21 optical observations (of which 2 are rejected as outliers) from 2017-10-21.361 to 2017-10-22.323."
JPL Sentry14452060-210986.77264e-07-9.31-9.740JPL: Computed at 07:19 today Pacific time based on 21 observations spanning .96232 days (2017-Oct-21.35974 to 2017-Oct-22.32206). Diameter approximately 0.002 km. from weighted mean H=30.79.
2017 USJPL Sentry18462070-2117260.000320927519-4.34-4.730JPL: Computed at 09:03 today Pacific time based on 78 observations spanning 5.0100 days (2017-Oct-16.34512 to 2017-Oct-21.35511). Diameter approximately 0.022 km. from weighted mean H=25.90.
2017 QO36NEODyS1418R E M O V E D-
2008 USNEODyS18462018-2087518.31e-06-7.32-7.520NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2008-10-21.355 to 2008-10-21.436."
JPL Sentry14452018-2069301.07215251e-05-6.41-6.560JPL: Computed at 14:44 April 7th Pacific time based on 15 observations spanning .08144 days (2008-Oct-21.35391 to 2008-Oct-21.43535). Diameter approximately 0.002 km. from weighted mean H=31.41.

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 22 October '17

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

2126Generated Traffic Report
1846Noted that NEODyS has updated its 2008 US risk assessment - see above
Noted that NEODyS has posted 2017 UJ2 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 US risk assessment - see above
1508Grabbed MPEC 2017-U167 - 2017 UU2 - see above
1445Noted that JPL Sentry has updated its 2008 US risk assessment - see above
Noted that JPL Sentry has posted 2017 UJ2 as an impact risk - see above
Grabbed MPEC 2017-U160 - 2017 UO2 - see above
Grabbed MPEC 2017-U161 - 2017 UP2 - see above
Grabbed MPEC 2017-U162 - 2017 UQ2 - see above
Grabbed MPEC 2017-U163 - 2017 UN2 - see above
Grabbed MPEC 2017-U164 - 2017 UR2 - see above
Grabbed MPEC 2017-U165 - 2017 US2 - see above
Grabbed MPEC 2017-U166 - 2017 UT2 - see above
1418Noted that NEODyS has removed 2017 QO36 as an impact risk - see above
Grabbed MPEC 2017-U154 - 2017 UJ2 - see above
Grabbed MPEC 2017-U155 - Daily Orbit Update - see above
Grabbed MPEC 2017-U156 - 2017 SN33 - see above
Grabbed MPEC 2017-U157 - 2017 UK2 - see above
Grabbed MPEC 2017-U158 - 2017 UL2 - see above
Grabbed MPEC 2017-U159 - 2017 UM2 - see above