Sentinel-3

from Wikipedia, the free encyclopedia
Sentinel-3A / 3B
Sentinel-3A / 3B
Type: Ocean observation satellites
Operator: European space agencyESA ESA / EUMETSAT
COSPAR-ID : 3A: 2016-011A
3B: 2018-039A
Mission dates
Dimensions: 1250 kg
Size: 3.7 m × 2.2 m × 2.2 m
Begin: 3A: February 16, 2016, 17:57 UTC
3B: April 25, 2018, 17:57: 52.016 UTC
Starting place: Plesetsk 133/3
Launcher: 3A: Rockot
3B: Rockot
Flight duration: 7 to 12 years
Status: 3A: in orbit
3B: in orbit
Orbit data
Rotation time : 101.0 min
Orbit inclination : 98.6 °
Apogee height :  811.5 km
Perigee height :  811.5 km

Sentinel-3 , made up of Sentinel-3A and Sentinel-3B , is a pair of Earth observation satellites . Like the Sentinel-1 and Sentinel-2 pairs, it is part of the Copernicus program (formerly GMES, Global Monitoring for Environment and Security) of the European Union . Unlike the two sister pairs, the two satellites will orbit the earth in an identical orbit offset by 140 °. Sentinel-3A was launched on February 16, 2016, and Sentinel-3B on April 25, 2018.

task

The two Sentinel-3 satellites are used for ocean observation. You will measure land and ocean colors as a continuation of the Envisat Meris instrument, land and sea temperature as a continuation of AATSR, and sea surface and ice topography as a continuation of the Envisat altimeter.

Sentinel-3A launched on February 16, 2016 and Sentinel-3B on April 25, 2018 from the Plesetsk Cosmodrome . The first picture was taken on February 29, 2016.

Instruments

The payload of the Sentinel-3 satellites consists mainly of the following five instruments:

OLCI (Ocean and Land Color Instrument)

The OLCI was designed as the successor to the MERIS sensor and has a similar structure plus some improvements. These include a higher spectral resolution , a higher temporal resolution (about 3-4 days) and less interference from reflected sunlight (Engl. Sun-glint ) by the camera is tilted to the west.

  • 1270 km of recording strips with 5 cameras
  • 21 spectral channels between 400 and 1020 nm wavelength
  • 300 m spatial resolution
tape Mean wavelength (nm) Bandwidth (nm) use
1 400 15th Correction of aerosol influences, improved detection of water constituents
2 412.50 10 Yellowness and cloudiness from detritus
3 442.50 10 Chlorophyll (absorption maximum), biogeochemistry , vegetation
4th 490 10 Chlorophyll ,
5 510 10 Chlorophyll , sediments, turbidity, red tide
6th 560 10 Chlorophyll (chlorophyll minimum)
7th 620 10 Sediments
8th 665 10 Chlorophyll (second absorption maximum), yellow matter , vegetation
9 673.75 7.5 Improved fluorescence determination
10 681.25 7.5 Chlorophyll , red edge
11 708.75 10 Chlorophyll , red edge
12 753.75 75 O2 absorption, clouds , vegetation
13 761.25 2.5 O2 absorption, correction of aerosol influences
14th 764.375 3.75 Atmospheric correction
15th 767.50 2.5 O2 absorption, fluorescence over land
16 778.75 15th Atmospheric correction, aerosol correction
17th 865 20th Atmospheric correction, aerosol correction, clouds
18th 885 10 Water vapor . Common reference band with the SLSTR sensor reference, vegetation
19th 900 10 Water vapor , vegetation
20th 940 20th Water vapor , atmospheric correction, aerosol correction
21st 1020 40 Atmospheric correction, aerosol correction

SLSTR (Sea and Land Surface Temperature Radiometer)

  • 1420 km recording strip in nadir direction, 750 km to the rear
  • 9 spectral channels between 550 nm and 12 µm wavelength
  • 500 m spatial resolution in the visible and near-infrared range, 1000 m in the medium and thermal infrared

SRAL (Sentinel-3 Ku / C Radar Altimeter)

  • Radar height measurements in low resolution mode (LRM) for homogeneous sea surfaces or as SAR in high resolution sea-ice mode.
  • Pulse frequency: 1.9 kHz (LRM) or 17.8 kHz (SAR)

MWR (Microwave Radiometer)

  • Dual measurements at 23.8 and 36.5 GHz
  • Radiometric accuracy of 3 K absolute (0.6 K relative)

POD (Precise Orbit Determination)

  • GPS, LRR and DORIS for determining the orbit with 3 cm accuracy

Data

The European Organization for the Use of Meteorological Satellites (EUMETSAT) in Darmstadt is responsible for the operational operation of the satellites and the distribution of the data.

Web links

Commons : Sentinel-3  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b ESA: Sentinel-3B liftoff. ESA, April 25, 2018, accessed April 25, 2018 .
  2. ↑ Orbit data according to SENTINEL 3A. N2YO, February 17, 2016, accessed February 17, 2016 .
  3. ↑ Sentinel-3B. ESA, February 2, 2018, accessed March 21, 2018 .
  4. ↑ Sentinel-3. ESA, accessed January 8, 2014 .
  5. ^ Third Sentinel satellite launched for Copernicus. ESA, February 16, 2016, accessed on February 16, 2016 .
  6. ↑ heise online: New European satellite Sentinel-3B observes the earth. Accessed April 26, 2018 (German).
  7. ↑ esa: Watch live: Sentinel-3B launch . In: European Space Agency . ( esa.int [accessed April 26, 2018]).
  8. ^ ESA: First image from Sentinel-3A. March 2, 2016, accessed March 7, 2016 .
  9. ↑ Sentinel-3. ESA's Global Land and Ocean Mission for GMES Operational Services. (PDF, 6.4 MB) ESA, November 14, 2012, pp. 47–71 , accessed on January 13, 2014 (English).