Contents  on 26 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 26 August '17

Six objects reported inside ten LD

Six visitors are reported to be less than ten lunar distances (LD) from Earth today. Nearest is newly-announced Moon-buzzing 2017 QQ17, which passes the Earth at 1.02 LD and the Moon at 0.94 LD, then leaves our planet's sphere of gravitational influence (SOI) and goes out of view for ground-based optical telescopes.

Earth passage I D ~Size Distance Today  Notes
1.02 LD today2017 QQ17 8 m  1.02 LD NEW, Moon buzzer today, Earth closest at 0422 UTC,
Moon closest 0.94 LD at 0657 UTC, exits Earth SOI - MPEC
1.44 LD Aug. 232017 QF3 8 m  5.99 to 8.78 LD risk
3.52 LD Aug. 222017 QS16 31 m  7.14 to 8.68 LD risk - DOU
5.47 LD Aug. 302017 QN1 16 m  9.00 from 10.98 LD enters ten LD
5.50 LD Aug. 222017 PV25 40 m  7.30 to 8.32 LD
9.10 LD yesterday2017 QJ2 21 m  9.99 to 12.56 LD exits ten LD
Approaching (sorted by 10-LD bubble entry date)
4.82 LD Aug. 312017 QQ1 37 m  < 10 LD tomorrow
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 generated at 1822 UTC with the discovery of 2017 QQ17 (MPEC) and with additional observation in today's DOU MPEC of risk-listed 2017 QS16 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 passes the Moon at less than one Earth-Moon distance but does 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.

NEOCP Activity  on 26 August '17

The MPC's NEO Confirmation Page has 58 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 58 objects listed. Of these, 22 were "one nighters." So far The Tracking News has counted a total of 71 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 26 August '17

Minor Planet Electronic Circulars

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


MPEC 2017-Q128 - "19:39 UT" - 2014 FP


MPEC 2017-Q127 - "16:28 UT" - 2017 QQ17


MPEC 2017-Q126 - "16:24 UT" - 2017 QW17


MPEC 2017-Q125 - "16:21 UT" - 2017 QV17


MPEC 2017-Q124 - "16:17 UT" - 2017 QU17


MPEC 2017-Q123 - "16:15 UT" - 2017 QT17


MPEC 2017-Q122 - "16:11 UT" - 2017 QS17


MPEC 2017-Q121 - "16:08 UT" - 2017 QR17


MPEC 2017-Q120 - "16:01 UT" - 2017 QP17


MPEC 2017-Q119 - "15:58 UT" - 2017 QO17


MPEC 2017-Q118 - "15:54 UT" - 2017 QN17


<< DOU on 26 Aug. '17 >>  MPEC 2017-Q117 - "12:11 UT" - Daily Orbit Update

Observers  on 26 August '17

A total of 29 observers appear in today's MPECs.

CodeObserver / observatory
B54Ager Obs. in Spain, 3 in MPEC 2017-Q117 -- 68950, 142464, 11500
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPECs 2017-Q117, 2017-Q118, 2017-Q119, 2017-Q120, 2017-Q121, 2017-Q122, 2017-Q125, 2017-Q126, 2017-Q127 & 2017-Q128 -- 2017 QW17, 2017 QV17, 2017 QS17, 2017 QR17, 2017 QR16, 2017 QQ17, 2017 QP17, 2017 QO17, 2017 QN17, 2014 FP
T08ATLAS Mauna Loa in Hawaii, 5 in MPEC 2017-Q117 -- 2017 PL26, 68950, 219021, 153415, 6053
107Cavezzo Obs. in Italy, 2 in MPECs 2017-Q121 & 2017-Q122 -- 2017 QS17, 2017 QR17
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-Q118 -- 2017 QN17
K65Cesena Obs. in Italy, 2 in MPECs 2017-Q121 & 2017-Q122 -- 2017 QS17, 2017 QR17
W84!program code "!" (10) via DECam in Chile, 1 in MPEC 2017-Q117 -- 2016 LE9
595Farra d'Isonzo Obs. in Italy, 4 in MPECs 2017-Q120, 2017-Q121, 2017-Q122 & 2017-Q126 -- 2017 QW17, 2017 QS17, 2017 QR17, 2017 QP17
157Frasso Sabino Obs. in Italy, 3 in MPECs 2017-Q117 & 2017-Q122 -- 2017 QS17, 2017 QB, 2017 PT25
J95Great Shefford Obs. in England, 2 in MPECs 2017-Q120 & 2017-Q127 -- 2017 QQ17, 2017 QP17
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-Q121 -- 2017 QR17
246KLENOT in the Czech Republic, 3 in MPECs 2017-Q117, 2017-Q120 & 2017-Q121 -- 2017 QR17, 2017 QP17, 2017 QB
Z43Landehen Obs., 3 in MPEC 2017-Q117 -- 90075, 190166, 6053
568_Marco Micheli on Mauna Kea in Hawaii, 5 in MPECs 2017-Q117, 2017-Q118, 2017-Q119, 2017-Q121 & 2017-Q123 -- 2017 QT17, 2017 QR17, 2017 QO17, 2017 QN17, 2017 QF17
583Odessa-Mayaki Obs. in Ukraine, 1 in MPEC 2017-Q117 -- 496018
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPECs 2017-Q117, 2017-Q118, 2017-Q119, 2017-Q121, 2017-Q123, 2017-Q124, 2017-Q125, 2017-Q126 & 2017-Q127 -- 2017 QW17, 2017 QV17, 2017 QU17, 2017 QT17, 2017 QR17, 2017 QQ17, 2017 QO17, 2017 QN17, 2017 NK, 2017 BW30, 2015 MC131, 470310, 142040
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2017-Q117 -- 2017 QS16
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2017-Q122 -- 2017 QS17
W25RMS Obs., 2 in MPECs 2017-Q121 & 2017-Q122 -- 2017 QS17, 2017 QR17
L04ROASTERR-1 in Romania, 1 in MPEC 2017-Q121 -- 2017 QR17
104San Marcello Pistoiese Obs. in Italy, 5 in MPECs 2017-Q121, 2017-Q122, 2017-Q124, 2017-Q125 & 2017-Q126 -- 2017 QW17, 2017 QV17, 2017 QU17, 2017 QS17, 2017 QR17
H36Sandlot Obs. in Kansas, 4 in MPECs 2017-Q120, 2017-Q121, 2017-Q122 & 2017-Q126 -- 2017 QW17, 2017 QS17, 2017 QR17, 2017 QP17
033Schwarzschild Obs. in Germany, 8 in MPECs 2017-Q119, 2017-Q120, 2017-Q121, 2017-Q122, 2017-Q123, 2017-Q124, 2017-Q125 & 2017-Q126 -- 2017 QW17, 2017 QV17, 2017 QU17, 2017 QT17, 2017 QS17, 2017 QR17, 2017 QP17, 2017 QO17
Y00SONEAR in Brazil, 2 in MPEC 2017-Q117 -- 3752, 3122
587Sormano Obs. in Italy, 6 in MPECs 2017-Q119, 2017-Q120, 2017-Q121, 2017-Q122, 2017-Q123 & 2017-Q127 -- 2017 QT17, 2017 QS17, 2017 QR17, 2017 QQ17, 2017 QP17, 2017 QO17
G45Space Surveillance Telescope Atom Site in New Mexico, 1 in MPEC 2017-Q117 -- 2017 BW30
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-Q119 -- 2017 QO17
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 2 in MPECs 2017-Q126 & 2017-Q127 -- 2017 QW17, 2017 QQ17
C51WISE in Earth polar orbit, 1 in MPEC 2017-Q120 -- 2017 QP17
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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 QS16NEODyS17002052-206331.5e-06-5.87-5.90NEODyS: "Based on 87 optical observations (of which 0 are rejected as outliers) from 2017-08-20.427 to 2017-08-23.119."
2017 PL26NEODyS17002081-2115431.18e-05-3.93-4.190NEODyS: "Based on 171 optical observations (of which 7 are rejected as outliers) from 2017-06-21.528 to 2017-08-25.321."
JPL Sentry15402081-2116401.818685e-05-3.75-4.110JPL: Computed at 07:59 today Pacific time based on 169 observations spanning 64.793 days (2017-Jun-21.52716 to 2017-Aug-25.31989). Diameter approximately 0.120 km. from weighted mean H=22.25.
2017 BW30NEODyS17002093-211532.18e-10-9.33-9.460NEODyS: "Based on 55 optical observations (of which 1 are rejected as outliers) from 2017-01-15.656 to 2017-02-06.173."
2015 MC131NEODyS1700R E M O V E D-
JPL Sentry1540R E M O V E DJPL: Risk listing removed at 1454 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 26 August '17

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

2200Grabbed MPEC 2017-Q128 - 2014 FP - see above
1822Generated Traffic Report
1700Noted that NEODyS has removed 2015 MC131 as an impact risk - see above
Noted that NEODyS has updated its 2017 BW30 risk assessment - see above
Noted that NEODyS has updated its 2017 PL26 risk assessment - see above
Noted that NEODyS has updated its 2017 QS16 risk assessment - see above
1632Grabbed MPEC 2017-Q120 - 2017 QP17 - see above
Grabbed MPEC 2017-Q121 - 2017 QR17 - see above
Grabbed MPEC 2017-Q122 - 2017 QS17 - see above
Grabbed MPEC 2017-Q123 - 2017 QT17 - see above
Grabbed MPEC 2017-Q124 - 2017 QU17 - see above
Grabbed MPEC 2017-Q125 - 2017 QV17 - see above
Grabbed MPEC 2017-Q126 - 2017 QW17 - see above
Grabbed MPEC 2017-Q127 - 2017 QQ17 - see above
1604Grabbed MPEC 2017-Q118 - 2017 QN17 - see above
Grabbed MPEC 2017-Q119 - 2017 QO17 - see above
1540Noted that JPL Sentry has removed 2015 MC131 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 PL26 risk assessment - see above
Grabbed MPEC 2017-Q117 - Daily Orbit Update - see above