Sentinel-1B

Sentinel-1B

Model of a Sentinel-1 satellite (with radar antenna missing)
Mission type	Earth observation
Operator	ESA
COSPAR ID	2016-025A
SATCAT no.	41456
Website	Sentinel-1 (ESA)
Mission duration	Planned: 7 years[1] Elasped: 6 years, 3 months, 9 days[2]
Spacecraft properties
Spacecraft type	Sentinel-1
Bus	Prima[3]
Manufacturer	Thales Alenia Space Airbus Defence and Space[1]
Launch mass	2,164 kg (4,771 lb)
Start of mission
Launch date	25 April 2016, 21:02 (2016-04-25UTC21:02) UTC[4]
Rocket	Soyuz-STA/Fregat-M[5]
Launch site	Kourou ELS[5]
Contractor	Arianespace
Orbital parameters
Reference system	Geocentric
Regime	Low Earth
Altitude	693 km[6]
Sentinel-1

Sentinel-1B was a European radar imaging satellite launched on 25 April 2016. It is the second of two original satellites in the Sentinel-1 constellation, part of the European Union's Copernicus programme on Earth observation. The satellite carries a C-SAR sensor, capable of providing high-resolution imagery regardless of weather conditions.

The satellite made its first observation on 28 April 2016, capturing a 250 kilometres (160 mi) wide image of the Austfonna glacier on Svalbard.^[7]

Beginning on December 23, 2021, the spacecraft experienced an anomaly which resulted in a loss of data transmission. On January 10, 2022, the European Space Agency confirmed online that a power issue was the root cause of the issue and that initial attempts to fix it had failed. The agency confirmed that efforts to restore the spacecraft's capabilities would continue,^[8] before announcing on 3 August 2022 that efforts to recover the mission would end. The power issue disabled the use of the satellite's payload, but otherwise the satellite remains operable, thus allowing ESA to perform a controlled deorbit. Sentinel-1B's deorbit is expected to take place once its successor satellite, Sentinel-1C is in orbit.^[9]

See also

• 2016 in spaceflight

References

1. "Facts and figures / Sentinel-1". ESA. Retrieved 28 April 2016.
2. "End of mission of the Copernicus Sentinel-1B satellite". ESA. Archived from the original on 31 August 2022. Retrieved 28 May 2023.
3. "Thales Alenia Space flies high at the Space Symposium". Thales Group. 13 April 2015. Retrieved 28 April 2016.
4. "Sentinel-1B liftoff delayed another 24 hours". ESA. 23 April 2016. Retrieved 28 April 2016.
5. "Sentinel 1A, 1B, 1C, 1D". Gunter's Space Page. Retrieved 28 April 2016.
6. "ESA - Sentinel-1". Retrieved 18 January 2022.
7. "Sentinel-1B delivers". ESA. 28 April 2016. Retrieved 28 April 2016.
8. "Copernicus Sentinel 1-B Anomaly". Copernicus Open Access Hub. 10 January 2022. Retrieved 10 January 2022.
9. "Mission ends for Copernicus Sentinel-1B satellite". ESA. 3 August 2022. Retrieved 3 August 2022.