Sentinel-3A

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Sentinel-3A
Sentinel-3 spacecraft model.svg
Vector drawing of the Sentinel-3
Mission type Earth observation
Operator ESA  · EUMETSAT
COSPAR ID 2016-011A OOjs UI icon edit-ltr-progressive.svg
SATCAT no. 41335
Website Sentinel-3 (ESA)
Mission durationPlanned: 7 years [1]
Elapsed: 9 years, 8 months, 3 days
Spacecraft properties
Spacecraft type Sentinel-3
Bus Prima
Manufacturer Thales Alenia Space [2]
Launch mass1,250 kg (2,760 lb) [3]
Dry mass1,150 kg (2,540 lb) [4]
Dimensions3.9 × 2.2 × 2.2 m (12.8 × 7.2 × 7.2 ft) [3]
Power2,300 watts [3]
Start of mission
Launch date16 February 2016, 17:57 (2016-02-16UTC17:57) UTC [5]
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 7,182.47 km (4,462.98 mi)
Eccentricity 0.000309
Perigee altitude 802.12 km (498.41 mi)
Apogee altitude 806.56 km (501.17 mi)
Inclination 98.62°
Period 100.97 min
RAAN 117.18°
Argument of perigee 86.80°
Mean motion 14.26 rev/day
Repeat interval27 days [6]
Epoch 17 February 2016, 18:53:04 UTC [7]
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 [1]

Sentinel-3A is a European Earth observation satellite dedicated to oceanography which launched on 16 February 2016. [5] It was built as a part of the Copernicus Programme, and is the first of four planned Sentinel-3 satellites. Its sister satellite, Sentinel-3B, launched on 25 April 2018. After completing initial commissioning, each satellite was handed over to EUMETSAT for the routine operations phase of the mission. Two recurrent satellites—Sentinel-3C and Sentinel-3D—will follow in approximately 2025 and 2028 respectively to ensure continuity of the Sentinel-3 mission.

Contents

Mission history

In October 2015, the Sentinel-3A launch was planned for December 2015, [8] but delays in transportation from Cannes to the Plesetsk Cosmodrome postponed the launch to January 2016. [9] The spacecraft arrived at Talagi Airport aboard an Antonov An-124 on 28 November. [10] [11] By 17 December, Sentinel-3A completed pre-launch testing and was placed into storage for the Christmas break, lasting until 11 January 2016. [12] After the break, launch was scheduled for 4 February, [13] but while the spacecraft was being fuelled for launch, Khrunichev Space Center in Moscow determined that the launch pad needed to be recertified, resulting in a further delay. [14] Launch was eventually rescheduled for 16 February. [15]

Launch

Sentinel-3A was successfully launched on 16 February 2016 at 17:57  UTC from the Plesetsk Cosmodrome aboard a Rokot launch vehicle. The Briz-KM upper stage fired twice to insert the spacecraft into its intended 815 km (506 mi) orbit, first at 5 minutes and then at 75 minutes after launch. Spacecraft separation occurred at 79 minutes after launch, and ground controllers received the first communication from the vehicle at 92 minutes. [5] [16]

Operations

The first instrument switched on was OLCI. It made its first picture on 29 February 2016, capturing Svalbard island along with a part of the arctic ice pack near solar terminator. [17]

See also

References

  1. 1 2 "Sentinel-3 › Satellite Description". European Space Agency . Retrieved 30 January 2016.
  2. ↑ "Sentinel-3A arrived at launch site" (Press release). Thales Alenia Space. 2 December 2015. Retrieved 30 January 2016.
  3. 1 2 3 "Copernicus: Sentinel-3". eoPortal. European Space Agency. Retrieved 21 December 2015.
  4. ↑ "Satellite: Sentinel-3A". World Meteorological Organization . Retrieved 17 January 2016.
  5. 1 2 3 Bergin, Chris; Graham, William (16 February 2016). "Russian Rokot launches Sentinel-3A". NASA Spaceflight. Retrieved 16 February 2016.
  6. ↑ "Sentinel-3 › Mission Summary". European Space Agency. Retrieved 30 January 2016.
  7. ↑ "Sentinel 3A - Orbit". Heavens Above. 17 February 2016. Retrieved 17 February 2016.
  8. ↑ "Sentinel-3A shows off". European Space Agency. 15 October 2015. Retrieved 30 January 2016.
  9. ↑ "Sentinel-3A taking final steps to launch". European Space Agency. 3 December 2015. Retrieved 30 January 2016.
  10. ↑ "Safe at the launch site". European Space Agency. 4 December 2015. Retrieved 30 January 2016.
  11. ↑ "Sentinel-3A Launch Campaign Commenced". Eurockot Launch Services. 12 December 2015. Retrieved 30 January 2016.
  12. ↑ "Almost time to pack up for Christmas". European Space Agency. 17 December 2015. Retrieved 30 January 2016.
  13. ↑ "Back to Plesetsk and brrrrr... it's cold". European Space Agency. 12 January 2016. Retrieved 30 January 2016.
  14. ↑ "Satellite fuelling on hold". European Space Agency. 21 January 2016. Retrieved 30 January 2016.
  15. ↑ "Sentinel-3A gets new launch date". European Space Agency. 27 January 2016. Retrieved 30 January 2016.
  16. ↑ "Third Sentinel satellite launched for Copernicus". European Space Agency. 16 February 2016. Retrieved 16 February 2016.
  17. ↑ "Just two weeks after launch, the latest Sentinel satellite has offered a taster of what it will provide for the EU's Copernicus programme" (Press release). EUMETSAT. 2 March 2016. Archived from the original on 14 June 2016. Retrieved 2 March 2016.

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