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Studies of irregular satellites: I. Lightcurves and rotation periods of 25 Saturnian moons from Cassini observations

Denk, Tilmann and Mottola, Stefano (2019) Studies of irregular satellites: I. Lightcurves and rotation periods of 25 Saturnian moons from Cassini observations. Icarus, 322, pp. 80-102. Elsevier. DOI: 10.1016/j.icarus.2018.12.040 ISSN 0019-1035

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0019103518305013

Abstract

Disk-integrated time-resolved photometric observations have been performed for 25 irregular moons of Saturn with the ISS camera of the Cassini spacecraft in a wide range of solar phase angles. From the derived lightcurves, synodic rotation periods were determined, ranging from ~5.5 h to ~76 h; the fastest observed spin rate is much slower than the disruption rotation barrier of asteroids at ~2 h. The lightcurves show very different structures which indicates that Saturn's irregular moons have a large variety of shapes. All lightcurves except for Phoebe and Paaliaq show 2-maxima/2-minima or 3-maxima/3-minima patterns. The lightcurve amplitudes range between 0.1 mag and > 2 mag, the latter is measured in observations of objects Ymir, Kiviuq, and Siarnaq at phase angles alpha > 60deg. While most lightcurve amplitudes from observations obtained at alpha < 30deg are<0.5 mag, most at alpha > 50deg are>0.5 mag. This campaign marks the first utilization of an interplanetary spacecraft for a systematic photometric survey of irregular moons.

Item URL in elib:https://elib.dlr.de/131425/
Document Type:Article
Title:Studies of irregular satellites: I. Lightcurves and rotation periods of 25 Saturnian moons from Cassini observations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Denk, TilmannInstitut für Geowissenschaften, Freie Universität BerlinUNSPECIFIED
Mottola, Stefanostefano.mottola (at) dlr.dehttps://orcid.org/0000-0002-0457-3872
Date:2019
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:322
DOI :10.1016/j.icarus.2018.12.040
Page Range:pp. 80-102
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Saturn, satellites Irregular satellites Cassini spacecraft Satellites, rotation Photometry
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Mottola, Dr.phys. Stefano
Deposited On:28 Nov 2019 09:34
Last Modified:28 Nov 2019 09:34

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