11

It appears to match the "X band antenna" on this diagram: (Taken from https://directory.eoportal.org/web/eoportal/satellite-missions/c-missions/copernicus-sentinel-3 -- But they credit ESA for that image) It also matches the general style of at least one example antenna found in a google search for X-band antenna. (X Band Isoflux antenna from https://...


7

After reading @ Saiboogu's answer explaining what this is, I found some additional helpful information. This is an isoflux antenna, designed to provide an approximately constant flux of broadcast signal over the useful transmission footprint on the Earth, from the nadir out to a maximum cone angle of 60 degrees from the nadir as seen by the spacecraft. ...


4

Almost any time you see a satellite, you see those shiny covers. Those are almost always thermal blankets, and a good deal of the time they are blankets known as MLI (Multi-Layer Insulation). MLI design is specific to the mission and the anticipated environment. I would presume that the SRAL dish is large enough to significantly deform from thermal ...


3

That is definitely the Laser Retro Reflector (LRR). They are used to provide very precise ranging information. The Sentinel 3 LRR is a hemisphere of 7 corner cube reflectors on the Earth-facing side of the satellite to allow ground stations to get ranging data accurate down to millimeters, by shining lasers at the satellite and measuring the round trip time ...


3

@Dave's excellent answer has solved the mystery for me. It's germanium! Not a metal exactly, but a semiconductor. (a bit of) The Physics: Metals have a high density of free carriers that can be though of as a plasma. The plasma frequency of metals is usually in the ultraviolet (except for Born & Wolf; Alkali metals transparent to UV? Cesium transparent ...


3

If I understand your question correctly, you might be able to use the location search query option in the API to get content for a particular rectangle specified by the latitude and longitude of the opposite corners. From the API docs: -c <coordinates i.e.: lon1,lat1:lon2,lat2> : coordinates of two opposite vertices of the rectangular area of ...


2

You may want to use Sentinelsat, which is an open source Python library to support searching, downloading and retrieving the metadata of Sentinel satellite images from the Copernicus Open Access Hub. It offers both an easy-to-use command line interface as well as a powerful Python API. Sentinelsat can be installed with pip and is available from here: https:...


1

The SIRAL instrument has better spatial resolution due to its waveform processing: Unlike conventional radar altimeters, where the interval between pulses is about 500 us, the CryoSat-2 altimeter will send a burst of pulses with an interval of only 50 us between them. The returning echoes will be correlated, and by treating the whole burst at once, ...


1

In theory, a smaller telescope can see a dim object by just looking longer than a larger one. There are issues of noise and stability that limit this, but for small factors it works. So their plan seems to be to break up a large-telescope observing plan into plans for longer observations with multiple smaller telescopes. This (somehow) saves lots of cost. ...


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