An overview of the instrument suite for the deep impact mission

被引:81
作者
Hampton, DL
Baer, JW
Huisjen, MA
Varner, CC
Delamere, A
Wellnitz, DD
A'Hearn, MF
Klaasen, KP
机构
[1] Ball Aerosp & Technol Corp, Boulder, CO 80301 USA
[2] Univ Maryland, Dept Astron, College Pk, MD 20742 USA
[3] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
基金
美国国家航空航天局;
关键词
comets; CCD cameras; IR spectrometer;
D O I
10.1007/s11214-005-3390-8
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A suite of three optical instruments has been developed to observe Comet 9P/Tempel1, the impact of a dedicated impactor spacecraft, and the resulting crater formation for the Deep Impact mission. The high-resolution instrument (HRI) consists of an f/35 telescope with 10.5m focal length, and a combined filtered CCD camera and IR spectrometer. The medium-resolution instrument (MRI) consists of an f/17.5 telescope with a 2.1m focal length feeding a filtered CCD camera. The HRI and MRI are mounted on an instrument platform on the flyby spacecraft, along with the spacecraft star trackers and inertial reference unit. The third instrument is a simple unfiltered CCD camera with the same telescope as MRI, mounted within the impactor spacecraft. All three instruments use a Fairchild split-frame-transfer CCD with 1,024 x 1,024 active pixels. The IR spectrometer is a two-prism (CaF2 and ZnSe)imaging spectrometer imaged on a Rockwell HAWAII-1R HgCdTeMWIR array. The CCDs and IR FPA are read out and digitized to 14 bits by a set of dedicated instrument electronics, one set per instrument. Each electronics box is controlled by a radiation-hard TSC695F microprocessor. Software running on the microprocessor executes imaging commands from a sequence engine on the spacecraft. Commands and telemetry are transmitted via a MIL-STD-1553 interface, while image data are transmitted to the spacecraft via a low-voltage differential signaling (LVDS) interface standard. The instruments are used as the science instruments and are used for the optical navigation of both spacecraft. This paper presents an overview of the instrument suite designs, functionality, calibration and operational considerations.
引用
收藏
页码:43 / 93
页数:51
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