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Multiple event 2020-12-13 16:41:32 UTC    This event as been confirmed

Stations:

Fireball preview:

Glux (FRBO03)
20201213T164132_UT
Full size image detection Glux (FRBO03) 2020-12-13 16:41:32 Universal Time
Dijon (FRBO01)
20201213T164132_UT
Full size image detection Dijon (FRBO01) 2020-12-13 16:41:32 Universal Time
Lyon (FRRA02)
20201213T164132_UT
Full size image detection Lyon (FRRA02) 2020-12-13 16:41:32 Universal Time
Troyes (FRCA04)
20201213T164132_UT
Full size image detection Troyes (FRCA04) 2020-12-13 16:41:32 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

Glux (FRBO03)
20201213T164132_UT
FRBO03_astro.png
Dijon (FRBO01)
20201213T164132_UT
FRBO01_astro.png
Lyon (FRRA02)
20201213T164132_UT
FRRA02_astro.png
Troyes (FRCA04)
20201213T164132_UT
FRCA04_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 : 14806
multiple folder : /data/fripon_detections/multiple/202012/20201213T164132_UT
multiple count : 4
multiple status : 0
orbit perifocal : 0.568609 AU
orbit eccentricity : 0.738693
orbit inclination : 0.682886 °
orbit longitude : 261.81 °
orbit argument : 269.713 °
orbit anomaly : 345.038 °
orbit epoch : 2020-12-09 17:59:03
orbit semiaxis : 2.17602 AU
orbit tisserandJ : 3.26303
orbit perifocalsigma : 0.0072868 AU
orbit eccentricitysigma : 0.00072573
orbit inclinationsigma : 0.386697 °
orbit longitudesigma : 0.0257556 °
orbit argumentsigma : 1.05035 °
orbit anomalysigma : 0.379261 °
orbit epochsigma : 2142.94 s
orbit semiaxissigma : 0.0308998 AU
meteorite sizeinitial : 14.6825 cm
meteorite sizeinitialsigma : 16.7918 cm
meteorite massinitial : 10.4451 Kg
meteorite massinitialsigma : 35.8370423395 Kg
meteorite sizefinal : 0.00000413992 cm
meteorite sizefinalsigma : 0.000118212 cm
meteorite massfinal : 2.34148e-19 Kg
meteorite massfinalsigma : 2.00577e-17 Kg
meteorite enthalpy : 6.97521 MJ
meteorite enthalpysigma : 13.7513 MJ
trajectory VE : 24875.8 m/s
trajectory A : 0.00249524 m²/Kg
trajectory B : 0.00000000035773 m²/J
trajectory VEexpected : 24941.5 m/s
trajectory Aexpected : 0.00389249 m²/Kg
trajectory Bexpected : 0.000000000173373 m²/J
trajectory VEsigma : 186.595 m/s
trajectory Asigma : 0.00285371 m²/Kg
trajectory Bsigma : 0.000000000372761 m²/J
trajectory Gamma : 13.9169 °
trajectory Alpha : 47.9119
trajectory Beta : 15.0815
trajectory RadianRA : 77.7484 °
trajectory RadianDec : 27.595 °
trajectory RadianSigma : 5.627 °
trajectory AltitudeInitial : 85216.3 m
trajectory AltitudeFinal : 49942.1 m
trajectory Lenght : 146.661 Km
trajectory Duration : 5.9682 s
trajectory LongitudeInitial : 5.22755 °
trajectory LatitudeInitial : 48.789 °
trajectory LongitudeFinal : 3.51611 °
trajectory LatitudeFinal : 48.2307 °

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