Cometary observations in light-polluted environments: a case study of interstellar comet 2I/Borisov

Astrophysics and Space Science, Год журнала: 2025, Номер 370(4)

Опубликована: Апрель 1, 2025

Язык: Английский

Multiple Outbursts of Halley-type Comet 12P/Pons–Brooks

The Astronomical Journal, Год журнала: 2025, Номер 169(6), С. 338 - 338

Опубликована: Май 28, 2025

Abstract We present optical observations of the Halley-type comet 12P/Pons–Brooks (12P) on its approach to perihelion. The was active even in first at ∼8 au. Starting ∼4 au, 12P exhibited an extraordinary series outbursts, which brightness changed by a factor up 100 and coma morphology transformed under action radiation pressure into distinctive “horned” appearance. Individual outburst dust masses are several ×10 9 kg, with kinetic energies ∼10 14 J, release times 4 s, effective power 10 W. These properties most consistent with, although do not definitively establish, origin crystallization amorphous water ice related trapped supervolatile gases. This interpretation is supported observation that specific energy comparable (both 5 J kg −1 ).

Язык: Английский

Is it possible to create a realistic structure of a cometary nucleus analog in the laboratory?

Icarus, Год журнала: 2025, Номер unknown, С. 116646 - 116646

Опубликована: Май 1, 2025

Язык: Английский