International project Phobos. Experiment “celestial mechanics”

Kolyuka, Yu. F.; Kudryavtsev, S. M.; Тарасов, В. П.; Tikhonov, V. F.; Ivanov, N. M.; Polyakov, Vladimir S.; Potchukaev, V.N.; Papkov, O. V.; Sukhanov, K. G.; Akim, E. L.; Stepanians, V.A.; Nasirov, R.R.

doi:10.1016/0032-0633(91)90156-5

Cited by 15 publications

(10 citation statements)

References 1 publication

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“…The result of this work is in good agreement with Jacobson et al (1989) and Chapront-Touze (1990). The most recent determination by Bills et al (2005) by Kolyuka et al (1991) 3.991 15.248 9.959 11.224 8 Deimos The angles have been multiplied by the distance between the point of observation and the two satellites to provide values in kilometers. Table 4.…”

Section: Introducing the Pre-50 S Observationssupporting

confidence: 84%

First numerical ephemerides of the Martian moons

Lainey

Déhant²,

Pätzold

2007

A&A

116

127

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We present new ephemerides of Phobos and Deimos that are fit to observations from 1877 to 2005 and include recent spacecraft observations by Mars Global Surveyor and Mars Express. In contrast to earlier models, this is the first completely numerical one. In particular, the tidal effects have been modeled by the tidal bulge raised by each moon on the planet, instead of fitting secular accelerations in the satellite longitudes. This partly avoids absorbing the Deimos observational errors in its related tidal acceleration. Moreover, applying this model to other systems will be easier. Our estimate of the Martian dissipation is Q = 79.91 ± 0.69 (1σ-formal error) when assuming k 2 = 0.152 for the Martian Love number and Gm Ph = 0.68 × 10 6 m 3 /s 2 for the Phobos mass. We also report the possibility of fitting the Phobos oblateness gravity field. We suspect a non-uniform density for Phobos or a bias in either the observations or the Martian gravity field. A FORTRAN subroutine that computes the Martian moons' ephemerides is available on request.

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Section: Introducing the Pre-50 S Observationssupporting

confidence: 84%

First numerical ephemerides of the Martian moons

Lainey

Déhant²,

Pätzold

2007

A&A

116

127

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“…During the ill-fated Soviet Phobos mission, operating for a limited time span of 2 months in 1989, the positions of Phobos were measured with an accuracy of approx. 2 km (Kolyuka et al 1991). More than ten years after, the Mars Global Surveyor engaged in several flyby maneuvers of Phobos.…”

Section: Introductionmentioning

confidence: 99%

Astrometric observations of Phobos and Deimos with the SRC on Mars Express

Oberst¹,

Matz²,

Giese³

et al. 2006

A&A

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“…Depending on the accuracy of the measured data, we can also constrain the gravitational moments of Phobos and seasonal changes in the gravity field parameters of Mars (Lainey et al 2007;Lainey 2007). The orbit of Phobos has been studied by means of observations from the ground (see Morley 1989;Oberst et al 2006, and references therein) as well as from the Mariner 9 (Duxbury & Callahan 1989a), Viking (Duxbury & Callahan 1988), and Phobos (Kolyuka et al 1991) spacecraft. More recent observations include those of Mars Global Surveyor (Banerdt & Neumann 1999), MRO (unpublished data), and those of Mars Express, which were the subject of an earlier paper by our team (Oberst et al 2006).…”

Section: Introductionmentioning

confidence: 99%

New astrometric observations of Phobos with the SRC on Mars Express

Willner¹,

Oberst²,

Wählisch³

et al. 2008

A&A

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Methods. The measurements have been made using a newly developed technique that involves positional measurements of surface control points and verification of camera pointing by background stars. Results. The astrometric positions are in excellent agreement with currently available Phobos orbit models. However, we find remaining systematic offsets of 1.5−2.6 km such that Phobos is ahead of its predicted position along the track. Conclusions. Our observations will be a basis for further improvements in the Phobos ephemeris. The methods that we have developed will be useful for the astrometric tracking of planetary or asteroidal targets and spacecraft optical navigation in future planetary missions.

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International project Phobos. Experiment “celestial mechanics”

Cited by 15 publications

References 1 publication

First numerical ephemerides of the Martian moons

First numerical ephemerides of the Martian moons

Astrometric observations of Phobos and Deimos with the SRC on Mars Express

New astrometric observations of Phobos with the SRC on Mars Express

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