Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dps....33.5720c&link_type=abstract
American Astronomical Society, DPS Meeting #33, #57.20; Bulletin of the American Astronomical Society, Vol. 33, p.1147
Astronomy and Astrophysics
Astronomy
Scientific paper
BepiColombo mission will explore Mercury and its environment; the scientific payload will be onboard two orbiters and a lander: a planetary orbiter for spectrometric analyses, a magnetospheric orbiter for the observation of the magnetic field and its interactions with the solar wind and a lander for the in-situ study of surface and subsurface properties. The environment in which the mission will operate is extremely hard due to the position and the proximity to the sun (i.e. tidal forces); payloads will be subject to high temperatures variations and harsh day-night excursions; severe radiation bombardment will damage instruments if not enough shielded. Mariner 10 observations began to outline the particular characteristics of Mercury's weak magnetic field and active magnetosphere, absence of ionosphere and atmosphere. Nevertheless the non-exhaustive data-sets has leaded to ambiguities which can be resolved only by the acquisition of new remote measurements. Objective/goal of the proposed Tethered Magnetometer System (TEMS) are measurements in low orbit (in particular MPOs orbit) of the intrinsic weak magnetic field and hydromagnetic and thermoelectric phenomena not measurable by MMO instruments. For the development of the instrument no increase in the weight and in the thermal shielding of the MPO are required. Such a system will be host on CPM (chimic propulsion module) and will have a minimal impact configuration thanks to the low mass and the low volume of the deployable subsatellite housing the magnetometer. The CPM, after the release of the Lander module, has finished his operating life and won't be used any more. Moreover, once deployed the apoapsis of the tether system will be less than 400 km, with no possibility to harm the orbiter. After all mission operations with CPM are finished a reel system deploys a 500m tether with subsatellite at the end housing the magnetometer far away from magnetic noise of the CPM; power will be used directly from the one of the CPM (using its solar arrays). Tether is a low density high strength conductive tether. The deployer incorporates a brake, (to smoothly stop deployment), a tether turns counter, a tether cutter and associated electronics.
Angrilli Francesco
Bianchini Gianandrea
Colombatti Giacomo
Crepaldi Alberto
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