• Nie Znaleziono Wyników

Mars nutation estimates from radio-tracking of landed missions prior to InSight and ExoMars 2020

N/A
N/A
Protected

Academic year: 2021

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Pełen tekst

(1)

Mars nutation estimates from radio-tracking of landed missions prior to InSight and ExoMars 2020

S. Le Maistre (1), V. Dehant (1) and J.-C. Marty (2)

(1) Royal Observatory of Belgium, Brussels, Belgium, (2) CNES, Toulouse, France. (SebastienLeMaistre@oma.be / Tel:

+32-2-373-6755)

1. Introduction

We analyse the complete data set of Doppler tracking data ever acquired from the surface of Mars in order to see whether the liquid core signature in the nuta- tion signal can be observed. This study also allows us to refine and validate our data processing chain and software that will be used to process the forthcom- ing InSight-RISE and ExoMars 2020-LaRa measure- ments.

2. Historical data

All rover and lander Doppler tracking data available so far from a fixed point on the surface of Mars are combined in order to determine the Mars rotation and Orientation Parameters (MOP), and especially the nutation parameters. The characteristics of the different mission tracking datasets used in this study are summarised in Table 1.

Table 1: 2-way Doppler data points at 60-s of integration time used in the Mars rotation and orientation solutions presented here.

The approximative accuracy in the last column corresponds to the standard deviation of 2-way residuals obtained at first iteration with the rotation model of [1].

rover/lander Begin time, End time, time span Nb of kept/total Approx.

mission dd-mm-yy dd-mm-yy dur. [day] 2-way Doppler acc. [mm/s]

Viking lander1 21-07-76 30-12-78 892 13144*/15030 2*

Pathfinder 04-07-97 07-10-97 95 6950/7315 0.1

Stuck Spirit 26-03-09 24-02-10 335 231/250 0.2

Fixed Spirit 29-05-09 07-11-09 162 105/118 0.17

Opportunity 02-01-12 04-05-12 123 1303/1373 0.07

The tracking of the Mars Exploration Rovers has been acquired at different epochs in the Martian year with respect to the previous X-band tracking of the surface provided by Mars Pathfinder. As shown on Fig. 1, the now available distribution of X-band tracking data is favorable to the observation of sea- sonal variations in the Martian rotation and orientation

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0 30 60 90 120 150 180 210 240 270 300 330 360

Mars mean anomaly [deg]

-600 -400 -200 0 200 400 600

cosine term [mas]

Viking lander 1

V

Pathfinder

P

Spirit

S

Opportunity

O

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Cytaty

Powiązane dokumenty

The InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) mission landed in Elysium Planitia on Mars on 26 November 2018 and fully deployed

For the first time on Mars, InSight includes the ability to use the wind- and pressure-induced perturbations from seismic measurements by SEIS for atmospheric science 7,11,12,57

• Model core composition of Mars while matching the geochemistry of the Martian mantle (Ni, Co, Cr, Nb/Ta, W). • Accreting with low FeO content not consistent with

• assume shape and gravity field of planet and core result from surface topographic load, internal load at the crust-mantle interface, and planet rotation. • model for

The benefit of having LaRa after RISE for the determination of the Mars orientation and rotation parameters is demonstrated and the resulting improved constraints on the

core on nutation am- plitudes and on the FCN period we use a large set of plausible interior structure models with a non-elastic mantle rheology that are compatible with the most

Nevertheless, because the precession rate is inversely proportional to the polar moment of inertia, which is a key parameter to constrain interior models, we use radio tracking

The LaRa science: The Doppler measurements will be used to observe the orientation and rota- tion of Mars in space (precession, nutations, and length-of-day variations), as well