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Multiple event 2021-12-02 18:27:03 UTC    This event has been confirmed

Last trajectory update: 2021-12-02 18:35:59 UTC

Stations:

Fireball preview:

Charleville (FRCA03)
20211202T182701_UT
Full size image detection Charleville (FRCA03) 2021-12-02 18:27:01 Universal Time
Liege (BEWA01)
20211202T182703_UT
Full size image detection Liege (BEWA01) 2021-12-02 18:27:03 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

Charleville (FRCA03)
20211202T182701_UT
FRCA03_astro.png
Liege (BEWA01)
20211202T182703_UT
BEWA01_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
lightcurve_vs_Height_clean.png
Photometry
lightcurve_vs_Height_separate.png
Photometry
lightcurve_vs_Time_separate.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
3D Orbit
3d_orbit.png
Orbit projected on the ecliptic
2d_orbit.png

Pipeline content:

multiple id : 16699
multiple folder : /data/fripon_detections/multiple/202112/20211202T182703_UT
multiple count : 2
multiple status : 0
orbit perifocal : 0.849957 AU
orbit eccentricity : 0.333658
orbit inclination : 8.54219 °
orbit longitude : 70.5249 °
orbit argument : 63.3309 °
orbit anomaly : 320.69 °
orbit epoch : 2021-11-23 17:30:52
orbit semiaxis : 1.27556 AU
orbit tisserandJ : 5.00209
orbit perifocalsigma : 0.00225768 AU
orbit eccentricitysigma : 0.0029907
orbit inclinationsigma : 0.367068 °
orbit longitudesigma : 0.00100526 °
orbit argumentsigma : 0.809202 °
orbit anomalysigma : 0.741018 °
orbit epochsigma : 8025.97 s
orbit semiaxissigma : 0.00892645 AU
meteorite sizeinitial : 16.089 cm
meteorite sizeinitialsigma : 7.9464 cm
meteorite massinitial : 13.7437 Kg
meteorite massinitialsigma : 20.3640883796 Kg
meteorite sizefinal : 0.0000232261 cm
meteorite sizefinalsigma : 0.00023914 cm
meteorite massfinal : 4.13469e-17 Kg
meteorite massfinalsigma : 0.00000000000000127715 Kg
meteorite enthalpy : 2.80768 MJ
meteorite enthalpysigma : 2.2743 MJ
trajectory VE : 14903.4 m/s
trajectory A : 0.0022771 m²/Kg
trajectory B : 0.000000000811027 m²/J
trajectory VEexpected : 14915.8 m/s
trajectory Aexpected : 0.00279098 m²/Kg
trajectory Bexpected : 0.000000000630451 m²/J
trajectory VEsigma : 154.157 m/s
trajectory Asigma : 0.00112467 m²/Kg
trajectory Bsigma : 0.000000000328487 m²/J
trajectory Gamma : 21.2382 °
trajectory Alpha : 29.0303
trajectory Beta : 13.4484
trajectory RadianRA : 54.2371 °
trajectory RadianDec : 3.44521 °
trajectory RadianSigma : 9.76582 °
trajectory AltitudeInitial : 67619.7 m
trajectory AltitudeFinal : 44675.6 m
trajectory Lenght : 62.9289 Km
trajectory Duration : 4.40782 s
trajectory LongitudeInitial : 5.88959 °
trajectory LatitudeInitial : 49.7616 °
trajectory LongitudeFinal : 5.13662 °
trajectory LatitudeFinal : 49.9507 °

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