as a means of recovering THE CASE OF COMET 1917/F1 (MELLISH) Meteor showers as a means of recovering the orbital history of comets THE CASE OF COMET 1917/F1 (MELLISH) L. Neslušan1, J. Vaubaillon2, M. Hajduková Jr.1 1 Astronomical Institute, Slovak Academy of Sciences, Slovakia 2 IMCCE, France

MODELING METEOROID STREAMS gravitational action a stream can split into several filaments: a single parent body can associate several meteor showers

the dynamical evolution MODELING METEOROID STREAMS gravitational action a stream can split into several filaments: a single parent body can associate several meteor showers non-gravitational forces influencing the dynamical evolution influencing of the meteoroids the parent comet dynamics P-R DRAG ROCKET EFFECT

the dynamical evolution MODELING METEOROID STREAMS gravitational action a stream can split into several filaments: a single parent body can associate several meteor showers non-gravitational forces influencing the dynamical evolution influencing of the meteoroids the parent comet dynamics OBSERVED SHOWERS PREDICTED SHOWERS P-R DRAG ROCKET EFFECT

the dynamical evolution MODELING METEOROID STREAMS gravitational action a stream can split into several filaments: a single parent body can associate several meteor showers non-gravitational forces influencing the dynamical evolution influencing of the meteoroids the parent comet dynamics OBSERVED SHOWERS PREDICTED SHOWERS P-R DRAG ROCKET EFFECT recovery of the comets’ PAST orbitAL evolution

METEOR SHOWER COMPLEX OF COMET C/1917 F1

METEOR SHOWER COMPLEX OF COMET C/1917 F1 ۰ Video meteors ۰ Photographic meteors

METEOR SHOWER COMPLEX OF COMET C/1917 F1 APRIL ρ-CYGNIDS ? F3 December Monocerotids F4 ۰ Video meteors ۰ Photographic meteors

ON THE STREAM STRUCTURE INFLUENCE OF VARIOUS EVOLUTIONARY TIMES ON THE STREAM STRUCTURE single parent comet various showers of different ages

INFLUENCE OF VARIOUS EVOLUTIONARY TIMES tev = 5 kyr

INFLUENCE OF VARIOUS EVOLUTIONARY TIMES tev = 10 kyr

INFLUENCE OF VARIOUS EVOLUTIONARY TIMES tev = 20 kyr

INFLUENCE OF VARIOUS EVOLUTIONARY TIMES tev = 30 kyr

INFLUENCE OF VARIOUS EVOLUTIONARY TIMES tev = 50 kyr

INFLUENCE OF VARIOUS EVOLUTIONARY TIMES tev = 70 kyr

ON THE STREAM STRUCTURE INFLUENCE OF VARIOUS STRENGTHS OF P-R DRAG ON THE STREAM STRUCTURE particles of various sizes

INFLUENCE OF VARIOUS STRENGTHS OF P-R DRAG β = 0.0

INFLUENCE OF VARIOUS STRENGTHS OF P-R DRAG β = 0.0

INFLUENCE OF VARIOUS STRENGTHS OF P-R DRAG β = 0.0001

INFLUENCE OF VARIOUS STRENGTHS OF P-R DRAG β = 0.001

INFLUENCE OF VARIOUS STRENGTHS OF P-R DRAG β = 0.002

INFLUENCE OF VARIOUS STRENGTHS OF P-R DRAG β = 0.003

INFLUENCE OF VARIOUS STRENGTHS OF P-R DRAG β = 0.005

INFLUENCE OF VARIOUS STRENGTHS OF P-R DRAG β = 0.007

F2 F1, F3, F4

THE COMET’S ORBIT IN TIME CLONES OF THE COMET’S ORBIT WHEN THE PARTICLES WERE RELEASED CLONES OF THE COMET’S ORBIT

CLONED ORBIT OF THE COMET No 4 tev = 10kyr β = 0.001 β = 0.002 β = 0.005

CLONED ORBIT OF THE COMET No 4 tev = 20kyr β = 0.001 β = 0.005 β = 0.009

CLONED ORBIT OF THE COMET No 4 tev = 20kyr F2 F1, F3, F4 β = 0.001 β = 0.005 β = 0.009

CLONED ORBIT OF THE COMET No 4 tev = 50kyr β = 0.001 β = 0.005 β = 0.009

SEARCH FOR A CONVERGENCE OF THE ORBITS OF REAL METEORS BACKWARD INTEGRATION

ORBIT OBTAINED BY BACKWARD INTEGRATION OF OBSERVED METEORS

CONCLUSIONS to point out an eventual recovery of the past comet’s orbit by studying its observed meteor showers in case of success: the meteor databases a tool for tracing the past dynamical history of parent bodies that associate more than a single meteor shower