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Non-linear Sun sensor used by the TET-1 German microsatellite.. A Sun sensor is a navigational instrument used by spacecraft to detect the position of the Sun. [1] [2] Sun sensors are used for attitude control, solar array pointing, gyro updating, and fail-safe recovery.
The celestial phenomenon over the German city of Nuremberg on April 14, 1561, as printed in an illustrated news notice in the same month. An April 1561 broadsheet by Hans Glaser described a mass sighting of celestial phenomena or unidentified flying objects (UFO) above Nuremberg (then a Free Imperial City of the Holy Roman Empire).
Atomic Gravitational Wave Interferometric Sensor Attitude control (spacecraft) : Horizon sensor , Earth sensor , Moon sensor , Satellite Sensor , Sun sensor Catadioptric sensor
A horizon sensor is an optical instrument that detects light from the 'limb' of Earth's atmosphere, i.e., at the horizon. Thermal infrared sensing is often used, which senses the comparative warmth of the atmosphere, compared to the much colder cosmic background. This sensor provides orientation with respect to Earth about two orthogonal axes.
This so-called "sun gun" (Sonnengewehr) would be part of a space station 8,200 kilometres (5,100 mi) above Earth. The scientists calculated that a huge reflector, made of metallic sodium and with an area of 9 square kilometres (900 ha; 3.5 sq mi), could produce enough focused heat to make an ocean boil or burn a city. [ 1 ]
A Sun sensor works on the light entering a thin slit on top of a rectangular chamber that casts an image of a thin line on the bottom of the chamber, which is lined with a network of light-sensitive cells. These cells measure the distance of the image from a centerline and using the height of the chamber can determine the angle of refraction.
The company's Sun angle sensors are used on satellites to control the orientation of the vehicle. For most communications and reconnaissance satellites, a proper orientation is essential for nominal functioning. [13] According to Vice President Tom MacDonald, every orbiting GPS satellite is equipped with a Sun angle sensor from Adcole. [6]
There are two secondary science instruments: the X-ray Photometer (XP) and the Sun Position Sensor (SPS). XP is a single photodiode with a beryllium filter in front of it of nearly identical thickness to the sum of the two beryllium filters in front of the X123. The purpose of XP is provide an on-orbit cross-calibration for the X123: the sum of ...