Contents  on 29 August '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 29 August '17

Three objects reported inside ten LD

Three minor objects are reported to be within ten lunar distances (LD) of our home world today. All of them are inbound and of a similar distance, not coming particularly close. 2017 QN1 moves in from 5.98 to 5.47 LD, 2017 QG18 from 6.95 to 5.87 LD, and 2017 QQ1 from 7.98 to 6.31 LD.

Earth passage I D ~Size Distance Today  Notes
4.36 LD Sept. 12017 QG18 13 m  5.87 from 6.95 LD
4.82 LD Aug. 312017 QQ1 37 m  6.31 from 7.98 LD
5.47 LD tomorrow2017 QN1 16 m  5.47 from 5.98 LD
Approaching (sorted by 10-LD bubble entry date)
2.79 LD Sept. 22017 QR32 16 m  < 10 LD Aug. 31, NEW - MPEC
7.87 LD Sept. 291989 VB 389 m  < 10 LD Sept. 25
0.13 LD Oct. 122012 TC4 15 m  < 10 LD Oct. 5, intruder, radar/NHATS target, risk
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

This report was updated at 2326 UTC with the discoveries of approaching 2017 QR32 (see the accompanying table) and of already departed 2017 QU32 (MPEC), which flew by us at 4.98 LD on August 23rd. Your first A/CC Busy Neighborhood traffic report was generated at 1718 UTC with first follow-up for departed 2017 QV1 (adding 6.32 days to its original 2.57-day observing arc) in today's DOU MPEC along with further observation of departed Moon-buzzing 2017 QQ17 from within its discovery arc.



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. "Moon buzzing" is used here to describe an object that passed the Moon at less than one Earth-Moon distance but did not intrude into the Earth-Moon system on this passage. 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.

Radar Astrometry  on 29 August '17

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2049 UTC when the database was dated 29 Aug.



Photometry and some astrometry is needed for upcoming radar targets. See Arecibo and Goldstone schedules.

NEOCP Activity  on 29 August '17

The MPC's NEO Confirmation Page has 56 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 56 objects listed. Of these, 22 were "one nighters." So far The Tracking News has counted a total of 68 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 29 August '17

Minor Planet Electronic Circulars

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


MPEC 2017-Q150 - "21:31 UT" - 2017 QW32


MPEC 2017-Q149 - "21:27 UT" - 2017 QV32


MPEC 2017-Q148 - "21:24 UT" - 2017 QU32


MPEC 2017-Q147 - "21:21 UT" - 2017 QT32


MPEC 2017-Q146 - "21:17 UT" - 2017 QS32


MPEC 2017-Q145 - "21:14 UT" - 2017 QR32


MPEC 2017-Q144 - "21:10 UT" - 2017 QQ32


MPEC 2017-Q143 - "21:07 UT" - 2017 QP32


MPEC 2017-Q142 - "20:58 UT" - 2017 QO32


<< DOU on 29 Aug. '17 >>  MPEC 2017-Q141 - "12:03 UT" - Daily Orbit Update

Observers  on 29 August '17

A total of 32 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPECs 2017-Q141, 2017-Q148, 2017-Q149 & 2017-Q150 -- 2017 QY2, 2017 QW32, 2017 QV32, 2017 QV1, 2017 QU32, 2017 QR16, 2017 QH2, 2017 QG3, 2017 QD17, 2017 PS25, 2017 PC27, 2017 OL1, 2017 OH68, 2017 OD1, 2017 NM6, 2016 TE93, 2010 GP67, 374449, 253586
T05ATLAS Haleakala in Hawaii, 5 in MPEC 2017-Q141 -- 2017 PJ26, 2017 OD1, 480858, 142561, 136923
T08ATLAS Mauna Loa in Hawaii, 9 in MPEC 2017-Q141 -- 2017 PU25, 2016 AA9, 2008 MH1, 488494, 361071, 265196, 159467, 142561, 141874
309'Martin Altmann in Germany via Cerro Paranal in Chile, 1 in MPEC 2017-Q141 -- 2017 MY2
I17Cupillari Obs. in Pennsylvania, 1 in MPEC 2017-Q141 -- 137799
006Fabra Obs. in Spain, 1 in MPEC 2017-Q141 -- 422699
734Farpoint Obs. in Kansas, 1 in MPEC 2017-Q143 -- 2017 QP32
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 3122
J95Great Shefford Obs. in England, 3 in MPECs 2017-Q141, 2017-Q142 & 2017-Q149 -- 2017 QV32, 2017 QO32, 2017 PY24
A17Guidestar Obs. in Germany, 2 in MPEC 2017-Q141 -- 2017 QX1, 2017 OT18
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-Q141 -- 322763
Q62(P.S. Lau in Hong Kong via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-Q141 -- 223456
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-Q141 -- 2017 PV26
246KLENOT in the Czech Republic, 17 in MPEC 2017-Q141 -- 2017 QX1, 2017 QW17, 2017 QS17, 2017 QR17, 2017 QO17, 2017 QG3, 2017 QB, 2017 PU25, 2017 PT25, 2017 PS25, 2017 OT18, 2017 OH68, 2017 OD1, 2017 NL6, 2017 MY2, 2016 AA9, 2006 KA40
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2017-Q145, 2017-Q146, 2017-Q147, 2017-Q148, 2017-Q149 & 2017-Q150 -- 2017 QW32, 2017 QV32, 2017 QU32, 2017 QT32, 2017 QS32, 2017 QR32
568_Marco Micheli on Mauna Kea in Hawaii, 3 in MPECs 2017-Q141, 2017-Q142 & 2017-Q143 -- 2017 QQ17, 2017 QP32, 2017 QO32
G96Mt. Lemmon Survey (MLS) in Arizona, 26 in MPECs 2017-Q141, 2017-Q145, 2017-Q146, 2017-Q147, 2017-Q148, 2017-Q149 & 2017-Q150 -- 2017 QW32, 2017 QV32, 2017 QU32, 2017 QT32, 2017 QS32, 2017 QR32, 2017 QR17, 2017 QE2, 2017 QD17, 2017 QC3, 2017 OJ19, 2015 CN62, 2014 NF63, 2013 QH48, 2012 CO46, 2008 CA6, 85867, 408752, 376707, 340048, 162913, 154007, 152770, 100756, 5143, 3288
Z80Northolt Branch Obs. in England, 5 in MPEC 2017-Q141 -- 2017 PT25, 2017 PS25, 237805, 153415, 6053
G34Oberfrauendorf Obs. in Germany, 3 in MPEC 2017-Q141 -- 68950, 496018, 422699
C23Olmen Obs. in Belgium, 2 in MPEC 2017-Q141 -- 66146, 190166
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-Q141 -- 1993 RA
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2017-Q142, 2017-Q143, 2017-Q144, 2017-Q146, 2017-Q149 & 2017-Q150 -- 2017 QW32, 2017 QV32, 2017 QS32, 2017 QQ32, 2017 QP32, 2017 QO32
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2017-Q144 -- 2017 QQ32
K61Rokycany Obs. in the Czech Republic, 3 in MPEC 2017-Q141 -- 2017 QR17, 2017 PL26, 2017 PA27
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-Q148 & 2017-Q149 -- 2017 QV32, 2017 QU32
033Schwarzschild Obs. in Germany, 7 in MPECs 2017-Q142, 2017-Q144, 2017-Q145, 2017-Q146, 2017-Q147, 2017-Q148 & 2017-Q150 -- 2017 QW32, 2017 QU32, 2017 QT32, 2017 QS32, 2017 QR32, 2017 QQ32, 2017 QO32
Y00SONEAR in Brazil, 4 in MPEC 2017-Q141 -- 2017 PS30, 2015 FO124, 265196, 226554
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-Q141 -- 2017 OX18
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2017-Q141 -- 2017 QA, 2017 PR25, 2017 NK
I52Steward Obs. Mt. Lemmon Station in Arizona, 6 in MPECs 2017-Q144, 2017-Q145, 2017-Q146, 2017-Q147, 2017-Q148 & 2017-Q149 -- 2017 QV32, 2017 QU32, 2017 QT32, 2017 QS32, 2017 QR32, 2017 QQ32
L71Vedrus Obs. in Russia, 1 in MPEC 2017-Q141 -- 3122
C51WISE in Earth polar orbit, 2 in MPEC 2017-Q141 -- 495858, 456651
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2017-Q141 -- 90075, 153415
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 August '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 PV26JPL Sentry15452048-204811.173e-09-6.92-6.920JPL: Computed at 07:49 today Pacific time based on 26 observations spanning 22.582 days (2017-Aug-05.56722 to 2017-Aug-28.148763). Diameter approximately 0.190 km. from weighted mean H=21.29.
2017 PL26JPL Sentry15452087-2116102.218583e-06-4.65-4.900JPL: Computed at 07:57 today Pacific time based on 179 observations spanning 68.296 days (2017-Jun-21.52716 to 2017-Aug-28.82329). Diameter approximately 0.120 km. from weighted mean H=22.22.

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 29 August '17

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

2326Updated Traffic Report
2202Grabbed MPEC 2017-Q149 - 2017 QV32 - see above
Grabbed MPEC 2017-Q150 - 2017 QW32 - see above
2126Grabbed MPEC 2017-Q142 - 2017 QO32 - see above
Grabbed MPEC 2017-Q143 - 2017 QP32 - see above
Grabbed MPEC 2017-Q144 - 2017 QQ32 - see above
Grabbed MPEC 2017-Q145 - 2017 QR32 - see above
Grabbed MPEC 2017-Q146 - 2017 QS32 - see above
Grabbed MPEC 2017-Q147 - 2017 QT32 - see above
Grabbed MPEC 2017-Q148 - 2017 QU32 - see above
2049Noted Radar Astrometry database update - see above
1545Noted that JPL Sentry has updated its 2017 PL26 risk assessment - see above
Noted that JPL Sentry has updated its 2017 PV26 risk assessment - see above
Grabbed MPEC 2017-Q141 - Daily Orbit Update - see above