Modelling the measurement accuracy of pre-atmosphere velocities of meteoroids

Vida, Denis; Brown, Peter; Campbell-Brown, M.

doi:10.1093/mnras/sty1841

Cited by 43 publications

(36 citation statements)

References 49 publications

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“…At the end of the luminous path, 21.5 km above the ground, the meteoroid slowed down to 4.0 ± 0.2 km s -1 . The estimated value of 76 km for the beginning height of the observed trajectory is in close agreement with experimental and simulated data presented in Vida et al (2018) for fireballs of asteroidal origin with a low entry speed (<13 km s -1 ), as seen by low sensitivity all-sky systems. They also found that low velocity meteors decelerate significantly prior to detection of the visible meteor trail.…”

Section: Atmospheric Trajectory and Dynamical Modelsupporting

confidence: 88%

Cavezzo, the first Italian meteorite recovered by the PRISMA fireball network. Orbit, trajectory, and strewn-field

Gardiol

Barghini

Buzzoni

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Two meteorite pieces have been recovered in Italy, near the town of Cavezzo (Modena), on 4th January 2020. The associated fireball was observed on the evening of New Year’s Day 2020 by eight all-sky cameras of the PRISMA fireball network, a partner of FRIPON. The computed trajectory had an inclination angle of approximately 68○ and a velocity at infinity of 12.8 km s−1. Together with the relatively low terminal height, estimated as 21.5 km, those values were indicating the significant possibility of a meteorite dropping event, as additionally confirmed by the non zero residual total mass. The strewn-field was computed taking into account the presence of two bright light flashes, revealing that the meteoroid had been very likely subject to fragmentation. Three days after the event, two samples, weighing 3.1 g and 52.2 g, were collected as a result of a dedicated field search and thanks to the involvement of the local people. The two pieces were immediately recognised as freshly fallen fragments of meteorite. The computed orbital elements, compared with the ones of known Near-Earth Asteroids from the NEODyS database, are compatible with one asteroid only; 2013 VC10. The estimated original mass of the meteoroid, 3.5 kg, and size, approximately 13 cm, is so far the smallest among the current 35 cases in which meteorites were recovered from precise strewn-field computation thanks to observational data. This result demonstrates the effectiveness of accurate processing of fireball network data even on challenging events generated by small size meteoroids.

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Section: Atmospheric Trajectory and Dynamical Modelsupporting

confidence: 88%

Cavezzo, the first Italian meteorite recovered by the PRISMA fireball network. Orbit, trajectory, and strewn-field

Gardiol

Barghini

Buzzoni

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…As the atmospheric correction to the initial velocity vector (Pecina and Ceplecha , ) used in C‐87 is not always applied (Vida et al. ), we shall additionally provide the orbital results of C‐87 by equating v ∞ and v 0 (see the Methods section) to assess the effects.…”

Section: Resultsmentioning

confidence: 99%

“…We must also note that the determination of the pre‐atmospheric velocity, v ∞ , as outlined in the appendix of Pecina and Ceplecha (), is not as well known among the meteor modeling community, and is frequently mistaken as the velocity at the first triangulated point, v 0 (Vida et al. ). This will lead to a misuse of Equations and in calculating v g as the Earth's atmospheric influence will not be accounted for.…”

Section: Methodsmentioning

confidence: 99%

Comparing analytical and numerical approaches to meteoroid orbit determination using Hayabusa telemetry

Jansen‐Sturgeon

Sansom

Bland

2019

Meteorit & Planetary Scien

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Fireball networks establish the trajectories of meteoritic material passing through Earth's atmosphere, from which they can derive pre‐entry orbits. Triangulated atmospheric trajectory data require different orbit determination methods to those applied to observational data beyond the Earth's sphere of influence, such as telescopic observations of asteroids. Currently, the vast majority of fireball networks determine and publish orbital data using an analytical approach, with little flexibility to include orbital perturbations. Here, we present a novel numerical technique for determining meteoroid orbits from fireball network data and compare it to previously established methods. The re‐entry of the Hayabusa spacecraft, with its known pre‐Earth orbit, provides a unique opportunity to perform this comparison as it was observed by fireball network cameras. As initial sightings of the Hayabusa spacecraft and capsule were made at different altitudes, we are able to quantify the atmosphere's influence on the determined pre‐Earth orbit. Considering these trajectories independently, we found the orbits determined by the novel numerical approach to align closer to JAXA's telemetry in both cases. Using simulations, we determine the atmospheric perturbation to become significant at ~90 km—higher than the first observations of typical meteorite dropping events. Using further simulations, we find the most substantial differences between techniques to occur at both low entry velocities and Moon passing trajectories. These regions of comparative divergence demonstrate the need for perturbation inclusion within the chosen orbit determination algorithm.

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“…Triangulation During the analysis of the event detected by the DFN, two separate triangulation methods were used. We did this to check the sensitivity of the orbital history for this meteoroid to the triangulation method based on the work of previous studies [Vida et al, 2018]. Our primary method is a straight line least squares (SLLS) algorithm, modified from [Borovicka, 1990], with an Extended Kalman Smoother (EKS) for velocity determination [Sansom et al, 2015].…”

Section: Event Dn160822_03 Observationsmentioning

confidence: 99%

Identification of a Minimoon Fireball

Shober¹,

Jansen‐Sturgeon²,

Sansom³

et al. 2019

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Objects gravitationally captured by the Earth-Moon system are commonly called temporarily captured orbiters (TCOs), natural Earth satellites, or minimoons. TCOs are a crucially important subpopulation of near-Earth objects to understand because they are the easiest targets for future sample-return, redirection, or asteroid mining missions. Only one TCO has ever been observed telescopically, 2006 RH 120 , and it orbited the Earth for about 11 months [Kwiatkowski et al., 2009]. Additionally, only one TCO fireball has ever been observed prior to this study [Clark et al., 2016]. We present our observations of an extremely slow fireball (codename DN160822_03) with an initial velocity of around 11.0 km s −1 that was detected by 6 of the high-resolution digital fireball observatories located in the South Australian region of the Desert Fireball Network (DFN). Due to the inherent dynamics of the system, the probability of the meteoroid being temporarily captured before impact is extremely sensitive to its' initial velocity. We examine the sensitivity of the fireball's orbital history to the chosen triangulation method. We use the numerical integrator REBOUND to assess particle histories and assess the statistical origin of DN160822_03. From our integrations we have found that the most probable capture time, velocity, semi-major axis, NEO group, and capture mechanism vary annually for this event. Most particles show that there is an increased capture probability during Earth's aphelion and perihelion. In the future, events like these may be detected ahead of time using telescopes like the LSST, and the pre-atmospheric trajectory can be verified.

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Modelling the measurement accuracy of pre-atmosphere velocities of meteoroids

Cited by 43 publications

References 49 publications

Cavezzo, the first Italian meteorite recovered by the PRISMA fireball network. Orbit, trajectory, and strewn-field

Cavezzo, the first Italian meteorite recovered by the PRISMA fireball network. Orbit, trajectory, and strewn-field

Comparing analytical and numerical approaches to meteoroid orbit determination using Hayabusa telemetry

Identification of a Minimoon Fireball

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