Issue |
A&A
Volume 686, June 2024
|
|
---|---|---|
Article Number | A248 | |
Number of page(s) | 11 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/202449573 | |
Published online | 18 June 2024 |
Determination of bolometric albedo based on spectroscopic measurements for selected dust analogues and its impact on the change of cometary brightness during its outburst
1
University of Rzeszów, College of Natural Sciences, Institute of Physics,
Pigonia 1 Street,
35-310
Rzeszów,
Poland
e-mail: mwesolowski@ur.edu.pl
2
University of Rzeszów, College of Natural Sciences, Institute of Materials Science and Engineering,
Pigonia 1 Street,
35-310
Rzeszów,
Poland
Received:
12
February
2024
Accepted:
29
April
2024
The paper presents the results of spectroscopic measurements for selected dust analogues, based on which change in cometary brightness was determined. In the first part of the article, we present the results of laboratory measurements of hemispherical albedo for selected dust analogues using a Cary 5000 spectrometer with an integrating sphere. In the case of this system and the tested samples, the obtained hemispherical albedo values ranged from 0.35 ± 0.07% to 41.58 ± 0.07%. The obtained measurement results were used to determine the bolometric albedo and geometric albedo. For the analogue consisting of charcoal, the Bond albedo was equal to AB(charcoal) = 2.15%, whereas the geometric albedo was equal to pv(charcoal) = 6.76%. The second part of the paper presents an analytical method allowing us to calculate the amplitude of the change of cometary brightness during the outburst. The calculations show that the upper value of the amplitude is 6.5 magnitudes, which is within the medium range amplitude of the outburst. Calculations have shown that as the bolometric albedo increases for a given agglomerate porosity, the temperature decreases, which determines a smaller sublimation flux, which translates into a larger change in the cometary brightness.
Key words: comets: general
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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