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Multiple event 2021-10-18 18:42:53 UTC    This event has been confirmed

Last trajectory update: 2021-10-18 20:08:57 UTC

Stations:

Fireball preview:

Saint-Lupicin (FRFC04)
20211018T184253_UT
Full size image detection Saint-Lupicin (FRFC04) 2021-10-18 18:42:53 Universal Time
Observatoire de la lèbe (FRRA05)
20211018T184253_UT
Full size image detection Observatoire de la lèbe (FRRA05) 2021-10-18 18:42:53 Universal Time
Grenoble (FRRA01)
20211018T184253_UT
Full size image detection Grenoble (FRRA01) 2021-10-18 18:42:53 Universal Time
Saint Pancrasse (FRRA12)
20211018T184252_UT
Full size image detection Saint Pancrasse (FRRA12) 2021-10-18 18:42:52 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

Saint-Lupicin (FRFC04)
20211018T184253_UT
FRFC04_astro.png
Observatoire de la lèbe (FRRA05)
20211018T184253_UT
FRRA05_astro.png
Grenoble (FRRA01)
20211018T184253_UT
FRRA01_astro.png
Saint Pancrasse (FRRA12)
20211018T184252_UT
FRRA12_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 : 16421
multiple folder : /data/fripon_detections/multiple/202110/20211018T184253_UT
multiple count : 4
multiple status : 0
orbit perifocal : 0.822131 AU
orbit eccentricity : 0.480352
orbit inclination : 1.93488 °
orbit longitude : 25.2828 °
orbit argument : 62.5549 °
orbit anomaly : 334.245 °
orbit epoch : 2021-10-11 06:38:09
orbit semiaxis : 1.58209 AU
orbit tisserandJ : 4.25324
orbit perifocalsigma : 0.000957844 AU
orbit eccentricitysigma : 0.000782107
orbit inclinationsigma : 0.0965703 °
orbit longitudesigma : 0.00209222 °
orbit argumentsigma : 0.153626 °
orbit anomalysigma : 0.0280353 °
orbit epochsigma : 2822.88 s
orbit semiaxissigma : 0.000803437 AU
meteorite sizeinitial : 3.63318 cm
meteorite sizeinitialsigma : 0.398686 cm
meteorite massinitial : 0.158261 Kg
meteorite massinitialsigma : 0.0521003323519 Kg
meteorite sizefinal : 2.34581 cm
meteorite sizefinalsigma : 0.848326 cm
meteorite massfinal : 0.0425986 Kg
meteorite massfinalsigma : 0.0462152 Kg
meteorite enthalpy : 102.495 MJ
meteorite enthalpysigma : 107.77 MJ
trajectory VE : 16240.6 m/s
trajectory A : 0.0100838 m²/Kg
trajectory B : 0.000000000098384 m²/J
trajectory VEexpected : 16227.5 m/s
trajectory Aexpected : 0.00970776 m²/Kg
trajectory Bexpected : 0.00000000013455 m²/J
trajectory VEsigma : 68.8311 m/s
trajectory Asigma : 0.00110655 m²/Kg
trajectory Bsigma : 0.0000000000937734 m²/J
trajectory Gamma : 30.6959 °
trajectory Alpha : 91.2259
trajectory Beta : 0.437476
trajectory RadianRA : 5.24882 °
trajectory RadianDec : 6.69363 °
trajectory RadianSigma : 2.29316 °
trajectory AltitudeInitial : 82005.6 m
trajectory AltitudeFinal : 36534.2 m
trajectory Lenght : 88.9417 Km
trajectory Duration : 6.0355 s
trajectory LongitudeInitial : 5.74855 °
trajectory LatitudeInitial : 45.6399 °
trajectory LongitudeFinal : 4.86177 °
trajectory LatitudeFinal : 45.9216 °

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