Determination of Phobos’ rotational parameters by an inertial frame bundle block adjustment

Burmeister, S.; Willner, Konrad; Schmidt, Valentina; Oberst, J.

doi:10.1007/s00190-018-1112-8

Cited by 19 publications

(24 citation statements)

References 33 publications

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“…Reference A (deg) Duxbury (1974) 3. Duxbury & Callahan (1989) 0.81 ± 0.5 Borderies & Yoder (1990) 1.19 Jacobson (2010) 1.03 ± 0.22 Willner et al (2010) 1.20 ± 0.14 Willner et al (2014) 1.14 Burmeister et al (2018) 1.14 ± 0.03 Present work (1σ)…”

Section: Adjustment Resultsmentioning

confidence: 90%

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Mars moon ephemerides after 14 years of Mars Express data

Lainey

Pasewaldt

Robert

et al. 2021

A&A

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The Mars Express (MEX) mission has been successfully operated around Mars since 2004. Among many results, MEX has provided some of the most accurate astrometric data of the two Mars moons, Phobos and Deimos. We present new ephemerides of the Mars moons benefitting from all previously published astrometric data to the most recent MEX SRC data. Observations from 1877 until 2018 and including spacecraft measurements from Mariner 9 to MEX were included. Assuming a homogeneous interior, we fitted the forced libration amplitude of Phobos simultaneously with the Martian tidal k2∕Q ratio and the initial state of the moons. Our solution of the physical libration 1.09 ± 0.01 degrees deviates notably from the homogeneous solution. Considering the very low error bar, however, this may essentially suggest the necessity to consider higher order harmonics with an improved rotation model in the future. While most data could be successfully fitted, we found a disagreement between the Mars Reconnaissance Orbiter and the Mars Express astrometric data at the kilometer level, probably associated with a biased phase correction. The current solution precision is expected at the level of a few hundred meters for Phobos and several hundred meters for Deimos for the coming years. The real accuracy of our new ephemerides will have to be confirmed by comparison with independent observational means.

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Section: Adjustment Resultsmentioning

confidence: 90%

“…Notes. Duxbury (1974), Duxbury & Callahan (1989), Willner et al (2010), andBurmeister et al (2018) used spacecraft imaging to solve directly for the physical libration of Phobos. Borderies & Yoder (1990) and Willner et al (2014) computed the libration of Phobos from the observed shape of Phobos assuming a homogeneous interior.…”

Section: Adjustment Resultsmentioning

confidence: 99%

Mars moon ephemerides after 14 years of Mars Express data

Lainey

Pasewaldt

Robert

et al. 2021

A&A

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“…Longer imaging sequences of mutual events showing either both Martian moons or one of the moons with Jupiter or Saturn in the background were analyzed by Ziese and Willner (2018). These observations can be obtained more frequently than direct observations during flybys.…”

Section: Mutual Events Observationsmentioning

confidence: 99%

Mars moon ephemerides after 14 years of Mars Express data

Lainey,

Pasewaldt,

Robert

et al. 2020

Preprint

View full text Add to dashboard Cite

The Mars Express (MEX) mission has been successfully operated around Mars since 2004. Among many results, MEX has provided some of the most accurate astrometric data of the two Mars moons, Phobos and Deimos. In this work we present new ephemerides of Mars' moons benefitting from all previously published astrometric data to the most recent MEX SRC data. All in all, observations from 1877 until 2016 and including spacecraft measurements from Mariner 9 to MEX were included. Assuming a homogeneous interior, we fitted Phobos' forced libration amplitude simultaneously with the Martian tidal k 2 /Q ratio and the initial state of the moons. Our solution of the physical libration 1.09 ± 0.01 degrees deviates notably from the homogeneous solution. But considering the very low error bar, this may essentially suggest the necessity to consider higher order harmonics, with an improved rotation model, in the future. While most data could be successfully fitted, we found a disagreement between the Mars Reconnaissance Orbiter and the Mars Express astrometric data at the kilometer level probably associated with a biased phase correction. The present solution precision is expected at the level of a few hundreds of meters for Phobos and several hundreds of meters for Deimos for the coming years. The real accuracy of our new ephemerides will have to be confirmed by confrontation with independent observational means.

show abstract

“…This equation is based on the derivation by Stark et al (2017) but with a correction to the prime meridian constant W 0 due to the forced libration in longitude, i.e. based on equations 3 and 10 of Burmeister et al (2018). However, at present the prime meridian of Phobos is defined dynamically, i.e.…”

mentioning

confidence: 99%