On the Proposed Interstellar Origin of the USG 20140108 Fireball

0574939 - ASÚ 2024 RIV GB eng J - Článek v odborném periodiku
Brown, P. G. - Borovička, Jiří
On the Proposed Interstellar Origin of the USG 20140108 Fireball.
Astrophysical Journal. Roč. 953, č. 2 (2023), č. článku 167. ISSN 0004-637X. E-ISSN 1538-4357
Grant CEP: GA ČR(CZ) GX19-26232X
Institucionální podpora: RVO:67985815
Klíčová slova: interstellar objects * meteoroids * Earth and planetary astrophysics
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 4.9, rok: 2022
Způsob publikování: Open access

A critical review of the evidence for the interstellar origin of the USG 20140108 fireball is presented. Examining United States Government (USG) fireball velocities where independent data are available shows the former to have significant (10-15 km s(-1)) uncertainties at large speeds and highly variable radiant accuracy, with average errors in excess of 10 & DEG,. The ablation model fits to the observed lightcurve are possible for normal chondritic impactors only assuming low speeds. To match the high speed and low fragmentation height of the USG 20140108 fireball would require a high-density/strength object with low drag and a highly aerodynamic shape not made of iron. We suggest the simplest explanation for the unusual characteristics of USG 20140108 is that the speed, in particular, is substantially overestimated.
Trvalý link: https://hdl.handle.net/11104/0345160