Contents  on 23 October '17

NOTE:  These A/CC news pages will update less often for a few days. All discoveries and observing credits will be reported, but we may miss some interim impact risk assessments and undercount NEOCP efforts, and there may be some days without a traffic report for Earth's Busy Neighborhood.

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 23 October '17

Sixteen objects reported inside ten LD

Sixteen minor objects are known to be inside ten lunar distances (LD) of Earth today. Nearest are 2017 UU2, moving in from 5.04 to 2.93 LD, and risk-listed intruder 2017 UJ2, outbound 2.97 to 4.16 LD.

Earth passage I D ~Size Distance Today  Notes
0.05 LD Oct. 202017 UJ2 2 m  2.97 to 4.16 LD intruder, risk - DOU
0.50 LD Oct. 192017 TD6 13 m  6.54 to 8.56 LD intruder, risk
1.19 LD Oct. 172017 UA 7 m  9.59 to 11.36 LD exits ten LD
1.97 LD Oct. 162017 UU1 14 m  7.86 to 9.09 LD
2.10 LD tomorrow2017 UU2 18 m  2.93 from 5.04 LD
3.37 LD yesterday2017 TV5 15 m  3.74 to 5.26 LD DOU
4.18 LD Oct. 152017 TK4 10 m  7.79 to 8.58 LD
4.27 LD Oct. 202017 UG 11 m  7.46 to 9.50 LD
4.80 LD Oct. 212017 TG4 48 m  5.95 to 7.75 LD
4.94 LD Oct. 212017 UH1 21 m  9.72 to 14.17 LD exits ten LD
5.50 LD yesterday2017 TQ5 11 m  5.53 to 5.81 LD
5.77 LD yesterday171576 1999 VP11 645 m  6.32 to 9.34 LD
5.95 LD yesterday2017 UQ2 22 m  6.07 to 7.66 LD
6.64 LD Oct. 192017 TA6 16 m  7.30 to 7.75 LD risk
6.95 LD Oct. 212017 UM1 25 m  8.50 to 11.19 LD exits ten LD
7.46 LD yesterday2017 US 22 m  7.46 to 7.53 LD risk
Approaching
8.66 LD Nov. 17444584 2006 UK 309 m  < 10 LD Nov. 16

This report was generated at 1850 UTC with follow-up in today's DOU MPEC for 2017 UJ2, 2017 TV5, and departed objects 2017 TY3, 2017 TS1, and 2017 TE1, plus 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 presently 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 23 October '17

The MPC's NEO Confirmation Page has 93 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 93 objects listed. Of these, 48 were "one nighters." So far The Tracking News has counted a total of 105 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 23 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 23 Oct. '17 >>  MPEC 2017-U170 - "12:05 UT" - Daily Orbit Update


MPEC 2017-U169 - "11:53 UT" - 2005 RB


MPEC 2017-U168 - "11:51 UT" - 2016 UO41

Observers  on 23 October '17

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 7 in MPEC 2017-U170 -- 2003 UV11, 500749, 497176, 496005, 457768, 338292, 333888
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2017-U170 -- 2017 TY3, 2017 TS5, 2017 TS3, 2017 TP4, 2017 TE1, 2017 SQ21, 2017 SQ12, 2017 SJ14, 2017 RO2, 2017 KR34, 484199
T08ATLAS Mauna Loa in Hawaii, 30 in MPEC 2017-U170 -- 2017 SY20, 2017 SL2, 2017 OH68, 2015 UM67, 2013 UM9, 2010 SA12, 96744, 96631, 90075, 68348, 65679, 53319, 498548, 496818, 416584, 411201, 265962, 253586, 220839, 190166, 162998, 142464, 141670, 137799, 7977, 7336, 5189, 5143, 3361, 3288
621Bergisch Gladbach Obs. in Germany, 1 in MPEC 2017-U170 -- 2017 OQ68
160Castelmartini Obs. in Italy, 15 in MPEC 2017-U170 -- 96744, 96631, 90075, 68950, 65679, 498548, 497176, 457768, 338292, 333888, 265962, 143624, 142040, 11500, 1980
703Catalina Sky Survey (CSS) in Arizona, 15 in MPEC 2017-U170 -- 2017 SQ11, 2014 YC15, 2008 MH1, 496005, 420302, 374851, 333888, 322763, 31221, 172034, 162273, 143992, 137078, 12711, 1864
734Farpoint Obs. in Kansas, 1 in MPEC 2017-U168 -- 2016 UO41
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2017-U170 -- 2014 YC15
857Iowa Robotic Obs. in Arizona, 1 in MPEC 2017-U170 -- 3361
H15ISON New Mexico Obs. in New Mexico, 3 in MPEC 2017-U170 -- 2017 LU, 2008 MH1, 374851
130Lumezzane Obs. in Italy, 9 in MPEC 2017-U170 -- 55408, 503293, 499490, 496837, 496818, 496005, 333908, 220909, 11500
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-U168 -- 2016 UO41
G96Mt. Lemmon Survey (MLS) in Arizona, 38 in MPECs 2017-U168 & 2017-U170 -- 2017 UR1, 2017 UC, 2017 TZ4, 2017 TU6, 2017 TR1, 2017 TO5, 2017 TN6, 2017 TM2, 2017 SS17, 2017 SE2, 2017 OQ68, 2017 HH, 2016 VO1, 2016 UO41, 2016 TE93, 2012 EC, 2003 SJ154, 503293, 498550, 497176, 495511, 449074, 448628, 433960, 340048, 338292, 333888, 303933, 27031, 242708, 220909, 162186, 141851, 140158, 11500, 8037, 4486, 1865
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-U170 -- 162998
F51Pan-STARRS 1 (PS1) in Hawaii, 23 in MPEC 2017-U170 -- 2017 UT, 2017 TB5, 2017 SX11, 2017 SS17, 2017 SJ14, 2017 RX15, 2017 PA27, 2017 FE128, 2011 JA8, 2011 CO2, 2010 SA12, 2008 FS6, 2000 YG29, 85709, 65679, 503293, 438430, 414990, 170013, 162980, 11405, 8035, 1865
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2017-U170 -- 153415
204Schiaparelli Obs. in Italy, 3 in MPEC 2017-U170 -- 2017 TS1, 2017 JU2, 496005
691Spacewatch 0.9m telescope in Arizona, 10 in MPEC 2017-U170 -- 2017 UQ, 2017 UO1, 2017 UJ2, 2017 TW3, 2017 TS1, 2017 SX11, 2016 TE93, 2012 PN28, 2011 QH21, 2007 TF68
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2017-U170 -- 2002 FD6, 2001 VC2
I52Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPECs 2017-U168 & 2017-U170 -- 2017 UR1, 2017 TG6, 2017 TE2, 2016 UO41
926Tenagra II Obs. in Arizona, 6 in MPECs 2017-U168 & 2017-U170 -- 2017 UJ2, 2017 TV5, 2017 TQ4, 2017 TO2, 2017 TF2, 2016 UO41
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-U169 -- 2005 RB
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 UJ2JPL Sentry17052074-209755.13098e-07-9.47-9.830JPL: Computed at 08:52 today Pacific time based on 27 observations spanning 1.0745 days (2017-Oct-21.35974 to 2017-Oct-22.43424). Diameter approximately 0.002 km. from weighted mean H=30.88.

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 23 October '17

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

1850Generated Traffic Report
1705Noted that JPL Sentry has updated its 2017 UJ2 risk assessment - see above
1344Grabbed MPEC 2017-U168 - 2016 UO41 - see above
Grabbed MPEC 2017-U169 - 2005 RB - see above
Grabbed MPEC 2017-U170 - Daily Orbit Update - see above