Sentinel-3B

Sentinel-3B is a European Earth observation satellite dedicated to oceanography which launched on 25 April 2018.^[1] It was built as a part of the Copernicus Programme, and is the second (after Sentinel-3A, launched 16 February 2016) of four planned Sentinel-3 satellites.

Sentinel-3B

Vector drawing of the Sentinel-3
Mission type	Earth observation
Operator	ESA · EUMETSAT
COSPAR ID	2018-039A
SATCAT no.	43437
Website	Sentinel-3 (ESA)
Mission duration	Planned: 7 years Elapsed: 7 years, 5 months, 27 days
Spacecraft properties
Spacecraft type	Sentinel-3
Bus	Prima
Manufacturer	Thales Alenia Space[1]
Launch mass	1,250 kg (2,756 lb)[2]
Dry mass	1,150 kg (2,535 lb)[3]
Dimensions	3.9 × 2.2 × 2.2 m (12.8 × 7.2 × 7.2 ft)[2]
Power	2,300 watts[3]
Start of mission
Launch date	25 April 2018, 17:57:51 (2018-04-25UTC17:57:51) UTC[1]
Rocket	Rokot/Briz-KM
Launch site	Plesetsk Cosmodrome, Site 133
Contractor	Eurockot Launch Services
Orbital parameters
Reference system	Geocentric
Regime	Sun-synchronous
Semi-major axis	7,180.77 km (4,461.92 mi)
Eccentricity	0.0001027
Perigee altitude	801.90 km (498.28 mi)
Apogee altitude	803.38 km (499.20 mi)
Inclination	98.6276°
Period	100.93 min
RAAN	183.84°
Argument of perigee	96.39°
Mean motion	14.26 rev/day
Repeat interval	27 days[4]
Epoch	25 April 2018, 20:50:15 UTC[5]
Transponders
Band	S band (TT&C support) X band (science data)
Bandwidth	S band: 64 kbit/s uplink, 1 Mbit/s downlink X band: 2 × 280 Mbit/s
Instruments OLCI Ocean and Land Colour Instrument SLSTR Sea and Land Surface Temperature Radiometer SRAL Synthetic Aperture Radar Altimeter MWR Microwave Radiometer DORIS Doppler Orbitography and Radiopositioning Integrated by Satellite LRR Laser Retro-Reflector GNSS Global Navigation Satellite System
Sentinel-3 ← Sentinel-3A Sentinel-3C → Sentinel ← Sentinel-5P Sentinel-6A →

Launch

Sentinel-3B was successfully launched on 25 April 2018 at 17:57 UTC from the Plesetsk Cosmodrome aboard a Rokot launch vehicle.^[1]

See also

• Sentinel-3#Instruments