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Multiple event 2017-08-04 21:12:34 UTC    This event has been confirmed

Stations:

Fireball preview:

Coulounieix-Chamiers (FRAQ06)
20170804T211238_UT
Full size image detection Coulounieix-Chamiers (FRAQ06) 2017-08-04 21:12:38 Universal Time
Le Bleymard (FRLR04)
20170804T211234_UT
Full size image detection Le Bleymard (FRLR04) 2017-08-04 21:12:34 Universal Time
Hendaye (FRAQ03)
20170804T211236_UT
Full size image detection Hendaye (FRAQ03) 2017-08-04 21:12:36 Universal Time
Saint-Bonnet-Elvert (FRLI02)
20170804T211234_UT
Full size image detection Saint-Bonnet-Elvert (FRLI02) 2017-08-04 21:12:34 Universal Time
Mauroux (FRMP06)
20170804T211233_UT
Full size image detection Mauroux (FRMP06) 2017-08-04 21:12:33 Universal Time
Onet-le-Château (FRMP07)
20170804T211229_UT
Full size image detection Onet-le-Château (FRMP07) 2017-08-04 21:12:29 Universal Time
Puy-de-Dome (FRAU01)
20170804T211234_UT
Full size image detection Puy-de-Dome (FRAU01) 2017-08-04 21:12:34 Universal Time
Aubusson (FRLI03)
20170804T211234_UT
Full size image detection Aubusson (FRLI03) 2017-08-04 21:12:34 Universal Time
Albi (FRMP04)
20170804T211233_UT
Full size image detection Albi (FRMP04) 2017-08-04 21:12:33 Universal Time

Geographical distribution

Trajectory:

Astrometry:

Because the FRIPON camera frame rate in 30/s and the filed of view is AllSky, the star limiting magnitude if barely 0 mag.
This prevents us from correctly perform the astro-photometry calibration. To overcome this difficulty, a long exposure image (5 sec) is taken once every 10 min.
This allows to detect star of up to magnitude 4, without disturbing the usual meteor detection process.
In order to bypass the weather limitation, a global astrometry calibration is performed once a month.
All detected stars are plotted together (green) in each of the figure shown below.
The rotation of the Earth creates star trails, except around the Polar star, which is therefore easily spotted.
The fireball is plotted in blue. The details of the method may be found in Jeanne et al 2019: Calibration of fish-eye lens and error estimation on fireball trajectories: application to the FRIPON network, A&A

Coulounieix-Chamiers (FRAQ06)
20170804T211238_UT
FRAQ06_astro.png
Le Bleymard (FRLR04)
20170804T211234_UT
FRLR04_astro.png
Hendaye (FRAQ03)
20170804T211236_UT
FRAQ03_astro.png
Saint-Bonnet-Elvert (FRLI02)
20170804T211234_UT
FRLI02_astro.png
Mauroux (FRMP06)
20170804T211233_UT
FRMP06_astro.png
Onet-le-Château (FRMP07)
20170804T211229_UT
FRMP07_astro.png
Puy-de-Dome (FRAU01)
20170804T211234_UT
FRAU01_astro.png
Aubusson (FRLI03)
20170804T211234_UT
FRLI03_astro.png
Albi (FRMP04)
20170804T211233_UT
FRMP04_astro.png

Pipeline previews:

Trajectory view:

First graph: line of sights, from FRIPON cameras to the fireball. The plots are provided in a plane normal to the best fitted trajectory. Its origin lies at the crossing of all lines of sight.
Second graph: zoom of the previous figure, extending to 1-sigma (blue) and 2-sigma (green) confidence interval.
This allows us to double check the presence of systematic biases in the calibration process.
The details of the method may be found in Jeanne et al 2019: Calibration of fish-eye lens and error estimation on fireball trajectories: application to the FRIPON network, A&A

LDV
ldv.png
LDV Zoom
ldv_zoom.png

Trajectory fit:

Bright flight
altitude.png
Bolide altitude as a function of time. If the timing of one of the stations is not good we will have a second curve.
Residuals (arc min)
residues.png
Residuals (meter)
mresidues.png

Atmospheric drag:

First graph: Fireball velocity as function of altitude. Black dots are computed using a 5 position sliding average. The red line represents the ablation and drag model. As fragmentation is not considered, light curve spikes and sudden deceleration events are not considered.
Second graph: the residuals of the fit.
The details of the method may be found in Jeanne et al 2019 Calibration of fish-eye lens and error estimation on fireball trajectories: application to the FRIPON network, A&A

Bolide Velocity
velocity.png
Residuals (arc min)
residue.png
V0-A correlation
V_A.png

Likelihood of the model of ablation and drag of the fireball. Each point represents a set of parameters (V0, A, B). These points are drawn evenly in this space parameters, then represented in the plane (V0, A). A corellation of parameters V0 and A leads to a decentering of the group of points. Conversely, a centered cloud indicates that the model is correctly adjusted, and that the A and Vo parameters are reliable. The unbiased determination of the parameter A (drag) is essential for the determination of the initial mass, as the initial speed V0 for determining the orbit. For precise information, refer to the article by F. Colas et al 2020 : FRIPON: a worldwide network to track incoming meteoroids, A&A

A-B correlation
A_B.png

Likelihood of the model of ablation and drag of the fireball. Each point represents a set of parameters (V0, A, B). These points are drawn evenly in this space parameters, then represented in the plane (A,B). A corellation of parameters A and B leads to a decentering of the group of points. Conversely, a centered cloud indicates that the model is correctly adjusted, and that the A and B parameters are reliable. The unbiased determination of the parameter B (ablation) is essential for the determination of the final mass mass. For precise information, refer to the article by F. Colas et al 2020 : FRIPON: a worldwide network to track incoming meteoroids, A&A

Photometry:

Fireball absolute magnitude as a function of altitude, as deduced from the measurements performed by each camera.
The absolute magnitude is the magnitude the fireball would present at an altitude of 100km at the zenith.
If the weather is perfectly clear at all stations, all absolute magnitude curves overlap.
In reality, atmospheric extinction due to the presence of clouds might induce biases. In addition, the photometry calibration is performed once a month (similarly to astrometry calibration).
The details of the method may be found in Jeanne et al 2019:Calibration of fish-eye lens and error estimation on fireball trajectories: application to the FRIPON network, A&A

Photometry
photometry.png

Orbit:

The 3D (left) and 3D (right) orbit of the meteoroid responsible for the detected fireball is shown in heliocentric ecliptic J2000 frame.
Units are astronomical units (AU). The 4 first cercles represent the orbits of Mercury, Venus, Earth and Mars.

3D orbit
orbit.png
Orbit projected on the ecliptic
orbitXY.png

Pipeline content:

multiple id : 5017
multiple folder : /data/fripon_detections/multiple/201708/20170804T211234_UT
multiple count : 9
multiple status : 0
orbit perifocal : 0.830449 AU
orbit eccentricity : 0.540802
orbit inclination : 2.85541 °
orbit longitude : 312.356 °
orbit argument : 61.1879 °
orbit anomaly : 339.652 °
orbit epoch : 2017-07-29 04:35:20
orbit semiaxis : 1.80848 AU
orbit tisserandJ : 3.86789
orbit perifocalsigma : 0.000604228 AU
orbit eccentricitysigma : 0.000648804
orbit inclinationsigma : 0.0553328 °
orbit longitudesigma : 0.00163871 °
orbit argumentsigma : 0.132292 °
orbit anomalysigma : 0.0921178 °
orbit epochsigma : 357.504 s
orbit semiaxissigma : 0.00360898 AU
meteorite sizeinitial : 7.5789 cm
meteorite sizeinitialsigma : 0.762596 cm
meteorite massinitial : 1.43659 Kg
meteorite massinitialsigma : 0.433653001036 Kg
meteorite sizefinal : 7.43488 cm
meteorite sizefinalsigma : 6.52149 cm
meteorite massfinal : 1.35624 Kg
meteorite massfinalsigma : 3.56887 Kg
meteorite enthalpy : 2607.03 MJ
meteorite enthalpysigma : 128891 MJ
trajectory VE : 17152.8 m/s
trajectory A : 0.00483399 m²/Kg
trajectory B : 0.00000000000185421 m²/J
trajectory VEexpected : 17145.2 m/s
trajectory Aexpected : 0.00454832 m²/Kg
trajectory Bexpected : 0.0000000000754029 m²/J
trajectory VEsigma : 19.5109 m/s
trajectory Asigma : 0.0004864 m²/Kg
trajectory Bsigma : 0.0000000000915345 m²/J
trajectory Gamma : 23.5712 °
trajectory Alpha : 55.8265
trajectory Beta : 0.0191855
trajectory RadianRA : 296.27 °
trajectory RadianDec : -18.5386 °
trajectory RadianSigma : 5.78597 °
trajectory AltitudeInitial : 84961.5 m
trajectory AltitudeFinal : 40158.4 m
trajectory Lenght : 112.068 Km
trajectory Duration : 6.71 s
trajectory LongitudeInitial : 1.71069 °
trajectory LatitudeInitial : 44.0265 °
trajectory LongitudeFinal : 1.18784 °
trajectory LatitudeFinal : 44.8618 °

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