Mass of particles released by comet 12P/Pons–Brooks during 2023–2024 outbursts

Monthly Notices of the Royal Astronomical Society, Journal Year: 2025, Volume and Issue: 538(1), P. 470 - 479

Published: Feb. 5, 2025

ABSTRACT During its most recent return, comet 12P/Pons–Brooks experienced 14 well-documented outbursts, observed between 2023 June 13 and 2024 April, at heliocentric distances ranging from $4.26\,$ to $0.85\,$ au. After perihelion, two additional outbursts were in summer 2024, of $1.20\,$ $2.26\,$ Using observational data, we developed a numerical model estimate the mass ejected during these events, focusing on sublimation ice through porous cometary nucleus. The key factors affecting estimates are outburst amplitude active surface area both quiet phases. Pogson’s law was used express magnitude, incorporating scattering cross-sections agglomerates. iteratively determined considering various types (H$_{2}$O CO$_{2}$) controlling activity. Our results indicate that ranged 10$^{10}$ 10$^{13}$ kg. findings highlight significant role morphology thermodynamic conditions providing insights into mechanisms driving phenomena their implications for evolution dust trail formation. Based analysis propose six-level classification scheme outbursts.

Language: Английский

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New measurements of the hemispherical albedo of cometary analogues: Influence on the amplitude of the change of cometary brightness during its outburst

Icarus, Journal Year: 2024, Volume and Issue: 416, P. 116087 - 116087

Published: April 17, 2024

The paper presents new experimental results of measurements the hemispherical albedo a potential comet analogue and an analysis its influence on change in cometary brightness. Measurements spectral properties tested analogues were performed using Cary 5000 spectrometer wavelength range from 200 to 2500 nm. Two samples used as dust analogue: mixture sand ash (sample A) charcoal B), respectively. obtained values for ranged 1.20% 32.25%. In particular, sample B, are comparable actual reflectance 67P. Based samples, thermodynamic model activity was developed used, among others, calculate power absorbed by sublimation flux occurring through porous structure fine-grained present surface. brightness during outburst, upper limit which equal 5.36 magnitude.

Language: Английский

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Determination of bolometric albedo based on spectroscopic measurements for selected dust analogues and its impact on the change of cometary brightness during its outburst

Astronomy and Astrophysics, Journal Year: 2024, Volume and Issue: 686, P. A248 - A248

Published: May 1, 2024

The paper presents the results of spectroscopic measurements for selected dust analogues, based on which change in cometary brightness was determined. In first part article, we present laboratory hemispherical albedo analogues using a Cary 5000 spectrometer with an integrating sphere. case this system and tested samples, obtained values ranged from 0.35 ± 0.07% to 41.58 0.07%. measurement were used determine bolometric geometric albedo. For analogue consisting charcoal, Bond equal A B (charcoal) = 2.15%, whereas p v 6.76%. second analytical method allowing us calculate amplitude during outburst. calculations show that upper value is 6.5 magnitudes, within medium range Calculations have shown as increases given agglomerate porosity, temperature decreases, determines smaller sublimation flux, translates into larger brightness.

Language: Английский

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Two methods for determining the temperature on the surface of the cometary nucleus based on spectroscopic measurements

Planetary and Space Science, Journal Year: 2024, Volume and Issue: unknown, P. 106027 - 106027

Published: Dec. 1, 2024

Language: Английский

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