Estimates of the physical parameters of remote planetary satellites

Emel'Yanov, N. V.; Ural'Skaya, V. S.

doi:10.1134/s0038094611050042

Cited by 6 publications

(4 citation statements)

References 22 publications

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“…The necessary condition for obtaining such estimates is to know their apparent stellar magnitude in the R , B , or V bands. For the majority of irregular satellites, such estimates were obtained earlier by Emel'yanov & Ural'skaya ( 2011 ). Here, we made an attempt to update the results of this work.…”

Section: P H Y S I C a L Pa R A M E T E R S O F S O M E S At E L L I ...mentioning

confidence: 54%

“…Here, we made an attempt to update the results of this work. The methodology we used was the same as the one described in Emel'yanov & Ural'skaya ( 2011 ). Note that we excluded from consideration the satellites J06-13, S09, and N02, since their sizes and masses can be determined by more reliable methods.…”

Section: P H Y S I C a L Pa R A M E T E R S O F S O M E S At E L L I ...mentioning

confidence: 99%

“…The tables also give the number of observations of the satellite in the corresponding spectral band and the rms deviation of the measured absolute magnitude from its modelled value ( σ ). When obtaining estimates for sizes and masses, we made assumptions about the albedos ( p ) and densities ( ρ) of the satellites similar to those made in Emel'yanov & Ural'skaya ( 2011 ), that is, for both V and R bands we took p = 0.04 and ρ = 2.6 g cm −3 , p = 0.06 and ρ = 2.3 g cm −3 , p = 0.04 and ρ = 1.5 g cm −3 , p = 0.04 and ρ = 1.5 g cm −3 for the moons of Jupiter, Saturn, Uranus, and Neptune, respectively.…”

Section: P H Y S I C a L Pa R A M E T E R S O F S O M E S At E L L I ...mentioning

confidence: 99%

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New ephemerides of outer planetary satellites

Emel'Yanov

Varfolomeev

Lainey

2022

Monthly Notices of the Royal Astronomical Society

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Ephemerides of planetary satellites require regular updates to take into account new observations of the satellites. Such revision has been all the more necessary in the case of outer planetary satellites, since a number of new moons have been discovered recently. Thus, we present updated versions of the ephemerides of the outer planetary satellites. The problem and the methodology for estimating ephemeris accuracy are discussed. Comparison with the Jet Propulsion Laboratory (JPL) ephemerides proves that the accuracy depends largely on the distribution of the observations. We give examples where, for a few satellites, the O−C residuals increase sharply at time intervals lying significantly beyond the time interval of observations used to generate the ephemerides. This fact alone indicates that there is an urgent need for new observations. Besides the ephemerides of moons, which can be accessed online via the MULTI-SAT server, we provide orbital parameters for the recently discovered faint satellites of Jupiter and Saturn. The problems discussed in this work are important for planning space observations of the outer satellites by future space missions like the European Space Agency (ESA) JUpiter ICy moons Explorer (JUICE) and National Aeronautics and Space Administration (NASA) Europa Clipper missions.

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Section: P H Y S I C a L Pa R A M E T E R S O F S O M E S At E L L I ...mentioning

confidence: 54%

Section: P H Y S I C a L Pa R A M E T E R S O F S O M E S At E L L I ...mentioning

confidence: 99%

Section: P H Y S I C a L Pa R A M E T E R S O F S O M E S At E L L I ...mentioning

confidence: 99%

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New ephemerides of outer planetary satellites

Emel'Yanov

Varfolomeev

Lainey

2022

Monthly Notices of the Royal Astronomical Society

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“…All satellites are listed in the order of increasing semimajor axes of their orbits around the planet. The relative masses of distant planet satellites obtained from satellite photometric observations (Emelyanov & Uralskaya, 2011) are taken from the NSDC website (http://www.sai.msu.ru/neb/nss/index.htm).…”

Section: Sundman Stability Of Planet Satellite Motionmentioning

confidence: 99%

Sundman stability of natural planet satellites

Lukyanov

Ural'Skaya

2012

Monthly Notices of the Royal Astronomical Society

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The stability of the motion of planet satellites is considered in a model of the general three‐body problem (sun–planet–satellite). ‘Sundman surfaces’ are constructed, by means of which the concept of ‘Sundman stability’ is formulated. A comparison of Sundman stability with the results of Golubev’s c2h method and with Hill’s classical stability in the restricted three‐body problem is performed. The constructed Sundman stability regions in the plane of ‘energy–moment of momentum’ parameters coincides with the analogous regions obtained by Golubev’s method, with the value (c2h)cr. Construction of Sundman surfaces in the three‐dimensional space of the specially selected coordinates xyR is carried out by means of the exact Sundman inequality in the general three‐body problem. Determination of the singular points of surfaces and regions of possible motion and Sundman stability analysis are implemented. It is shown that the singular points of the Sundman surfaces in the coordinate space xyR lie in different planes. The Sundman stability of all known natural satellites of planets is investigated. It is shown that a number of natural satellites that are stable according to Hill and also some satellites that are stable according to Golubev’s method are unstable in the sense of Sundman stability.

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Physical parameters of planetary satellites

Emel'Yanov¹

2021

The Dynamics of Natural Satellites of the Planets

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Estimates of the physical parameters of remote planetary satellites

Cited by 6 publications

References 22 publications

New ephemerides of outer planetary satellites

New ephemerides of outer planetary satellites

Sundman stability of natural planet satellites

Physical parameters of planetary satellites

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