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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Ejection of porous dust–ice agglomerates from the surface of the cometary nucleus

Icarus, Journal Year: 2023, Volume and Issue: 411, P. 115937 - 115937

Published: Dec. 30, 2023

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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