Contents  on 22 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 22 August '17

Four objects reported inside ten LD

There are four transient natural objects reported to be inside ten lunar distances (LD) of Earth today. Nearest are risk-listed 2017 QT1, which comes its closest to our planet this time around, reaching 2.59 LD at 1823 UTC, and newly announced risk-listed 2017 QF3, inbound from 5.74 to 3.07 LD.

Earth passage I D ~Size Distance Today  Notes
0.56 LD Aug. 202017 QN2 9 m  3.76 to 7.15 LD intruder
1.44 LD tomorrow2017 QF3 8 m  3.07 from 5.74 LD NEW, risk - MPEC
2.59 LD today2017 QT1 15 m  2.59 LD risk, Earth closest at 1823 UTC
5.50 LD today2017 PV25 40 m  5.50 LD Earth closest at 1615 UTC
Approaching (sorted by 10-LD bubble entry date)
9.10 LD Aug. 252017 QJ2 21 m  < 10 LD Aug. 24
5.47 LD Aug. 302017 QN1 16 m  < 10 LD Aug. 26 - DOU
4.82 LD Aug. 312017 QQ1 38 m  < 10 LD Aug. 27
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 1648 UTC with the discovery of 2017 QF3 (MPEC), and with first follow-up for approaching 2017 QN1 in today's DOU MPEC along with further follow-up for departed 2017 QW1.



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 22 August '17

The MPC's NEO Confirmation Page has 57 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 57 objects listed. Of these, sixteen were "one nighters." So far The Tracking News has counted a total of 69 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 August '17

Minor Planet Electronic Circulars

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


<< DOU on 22 Aug. '17 >>  MPEC 2017-Q90 - "12:04 UT" - Daily Orbit Update


MPEC 2017-Q89 - "01:18 UT" - 2017 QF3


MPEC 2017-Q88 - "01:15 UT" - 2017 QC3


MPEC 2017-Q87 - "01:12 UT" - 2017 QH3


MPEC 2017-Q86 - "01:09 UT" - 2017 QG3


MPEC 2017-Q85 - "01:06 UT" - 2017 QE3


MPEC 2017-Q84 - "01:02 UT" - 2017 QD3


MPEC 2017-Q83 - "00:59 UT" - 2017 QB3


MPEC 2017-Q82 - "00:56 UT" - 2017 QA3


MPEC 2017-Q81 - "00:53 UT" - 2017 QZ2


MPEC 2017-Q80 - "00:45 UT" - 2017 QY2

Observers  on 22 August '17

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2017-Q80, 2017-Q84, 2017-Q86, 2017-Q87, 2017-Q88 & 2017-Q89 -- 2017 QY2, 2017 QH3, 2017 QG3, 2017 QF3, 2017 QD3, 2017 QC3
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2017-Q90 -- 2014 YC15, 96631
160Castelmartini Obs. in Italy, 8 in MPEC 2017-Q90 -- 2008 MH1, 66146, 416584, 322763, 237805, 6053, 4197, 3753
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 16 in MPECs 2017-Q81, 2017-Q82, 2017-Q83 & 2017-Q90 -- 2017 QZ2, 2017 QW1, 2017 QN1, 2017 QK, 2017 QB3, 2017 QA3, 2017 PK26, 2017 OQ19, 2017 ML7, 2017 MF4, 2017 ME, 2017 MA4, 2017 KN4, 2017 KE3, 2017 GU6, 2017 FX64
B92Chinon Obs. in France, 1 in MPEC 2017-Q90 -- 6053
J27El Guijo Obs. in Spain, 5 in MPEC 2017-Q90 -- 2017 PL26, 68950, 496018, 265962, 190166
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 6 in MPECs 2017-Q84, 2017-Q85, 2017-Q86, 2017-Q87, 2017-Q89 & 2017-Q90 -- 2017 QH3, 2017 QG3, 2017 QF3, 2017 QE3, 2017 QD3, 2017 PL26
006Fabra Obs. in Spain, 1 in MPEC 2017-Q90 -- 6053
J95Great Shefford Obs. in England, 1 in MPEC 2017-Q89 -- 2017 QF3
W92MASTER OAFA Obs., 4 in MPEC 2017-Q90 -- 2014 UA192, 495959, 485652, 16657
568_Marco Micheli on Mauna Kea in Hawaii, 6 in MPECs 2017-Q80, 2017-Q81, 2017-Q82, 2017-Q83, 2017-Q88 & 2017-Q90 -- 2017 QZ2, 2017 QY2, 2017 QP2, 2017 QC3, 2017 QB3, 2017 QA3
583Odessa-Mayaki Obs. in Ukraine, 1 in MPEC 2017-Q90 -- 6053
C23Olmen Obs. in Belgium, 1 in MPEC 2017-Q90 -- 66146
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2017-Q80, 2017-Q81, 2017-Q82, 2017-Q83, 2017-Q84, 2017-Q85, 2017-Q86, 2017-Q87, 2017-Q88 & 2017-Q89 -- 2017 QZ2, 2017 QY2, 2017 QH3, 2017 QG3, 2017 QF3, 2017 QE3, 2017 QD3, 2017 QC3, 2017 QB3, 2017 QA3
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2017-Q84 -- 2017 QD3
D29Purple Mtn. Obs. Xuyi Station in China, 8 in MPEC 2017-Q90 -- 2017 PS25, 2017 OL1, 2017 OD1, 2017 MY2, 480858, 376707, 143409, 142561
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-Q89 -- 2017 QF3
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-Q88 -- 2017 QC3
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2017-Q86 -- 2017 QG3
033Schwarzschild Obs. in Germany, 4 in MPEC 2017-Q90 -- 2017 QR1, 2017 QG3, 2017 QD3, 2017 QC2
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2017-Q86 & 2017-Q88 -- 2017 QG3, 2017 QC3
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2017-Q82, 2017-Q84 & 2017-Q88 -- 2017 QD3, 2017 QC3, 2017 QA3
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-Q90 -- 2329
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-Q90 -- 2017 QX1
C51WISE in Earth polar orbit, 2 in MPEC 2017-Q90 -- 66146, 142040
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 QF3NEODyS15302035-2116554.56e-06-6.70-7.390NEODyS: "Based on 20 optical observations (of which 1 are rejected as outliers) from 2017-08-17.374 to 2017-08-20.922."
JPL Sentry03422043-2101323.31730583e-05-5.77-6.150JPL: Computed at 20:05 Aug. 21st Pacific time based on 20 observations spanning 3.5483 days (2017-Aug-17.3729 to 2017-Aug-20.9212). Diameter approximately 0.008 km. from weighted mean H=28.05.
2017 QD3JPL Sentry1530R E M O V E DJPL #2 for the day: Risk listing removed at 1504 UTC today.
2017 PL26JPL Sentry15302081-2116422.3796596e-05-3.62-4.390JPL: Computed at 08:00 today Pacific time based on 117 observations spanning 8.5707 days (2017-Aug-13.40074 to 2017-Aug-21.971426). Diameter approximately 0.120 km. from weighted mean H=22.21.
NEODyS01112089-2116552.48e-05-3.61-4.220NEODyS: "Based on 112 optical observations (of which 5 are rejected as outliers) from 2017-08-13.402 to 2017-08-21.003."

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 August '17

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

1648Generated Traffic Report
1530Noted that JPL Sentry has updated its 2017 PL26 risk assessment - see above
Noted that JPL Sentry has removed 2017 QD3 as an impact risk - see above
Noted that NEODyS has posted 2017 QF3 as an impact risk - see above
Grabbed MPEC 2017-Q90 - Daily Orbit Update - see above
0342Noted that JPL Sentry has posted 2017 QD3 as an impact risk - see above
Noted that JPL Sentry has posted 2017 QF3 as an impact risk - see above
0137Grabbed MPEC 2017-Q88 - 2017 QC3 - see above
Grabbed MPEC 2017-Q89 - 2017 QF3 - see above
0114Grabbed MPEC 2017-Q81 - 2017 QZ2 - see above
Grabbed MPEC 2017-Q82 - 2017 QA3 - see above
Grabbed MPEC 2017-Q83 - 2017 QB3 - see above
Grabbed MPEC 2017-Q84 - 2017 QD3 - see above
Grabbed MPEC 2017-Q85 - 2017 QE3 - see above
Grabbed MPEC 2017-Q86 - 2017 QG3 - see above
Grabbed MPEC 2017-Q87 - 2017 QH3 - see above
0111Noted that NEODyS has updated its 2017 PL26 risk assessment - see above
0051Grabbed MPEC 2017-Q80 - 2017 QY2 - see above