Back مرصد روفن رماتي للتصوير الطيفي الشمسي عالي الطاقة Arabic Reuven Ramaty High Energy Solar Spectroscopic Imager BS Reuven Ramaty High Energy Solar Spectroscopic Imager Czech Reuven Ramaty High Energy Solar Spectroscopic Imager German Reuven Ramaty High Energy Solar Spectroscopic Imager Spanish Reuven Ramaty High Energy Solar Spectroscopic Imager French Reuven Ramaty High Energy Solar Spectroscopic Imager Galician Reuven Ramaty High Energy Solar Spectroscopic Imager Croatian RHESSI Hungarian RHESSI Italian
 RHESSI spacecraft observing the Sun | |
| Names | Explorer 81 HESSI High Energy Solar Spectroscopic Imager RHESSI SMEX-6 |
|---|---|
| Mission type | Solar observatory |
| Operator | NASA / Space Sciences Laboratory |
| COSPAR ID | 2002-004A |
| SATCAT no. | 27370 |
| Website | RHESSI |
| Mission duration | 2 years (planned) [1] 16 years, 6 months, 10 days (achieved) |
| Spacecraft properties | |
| Spacecraft | Explorer LXXXI |
| Spacecraft type | Reuven Ramaty High Energy Solar Spectroscopic Imager |
| Bus | RHESSI |
| Manufacturer | Spectrum Astro Inc.[1] |
| Launch mass | 293 kg (646 lb) [2] |
| Dimensions | 2.16 × 5.76 m (7 ft 1 in × 18 ft 11 in) |
| Power | 414 watts |
| Start of mission | |
| Launch date | 5 February 2002, 20:58:12 UTC[3] |
| Rocket | Pegasus XL (F31) |
| Launch site | Cape Canaveral, Stargazer |
| Contractor | Orbital Sciences Corporation |
| Entered service | 2002 |
| End of mission | |
| Deactivated | 16 August 2018 [4] |
| Last contact | 11 April 2018 |
| Decay date | 20 April 2023 (UTC)[5] |
| Orbital parameters | |
| Reference system | Geocentric orbit[6] |
| Regime | Low Earth orbit |
| Perigee altitude | 579 km (360 mi) |
| Apogee altitude | 607 km (377 mi) |
| Inclination | 38.04° |
| Period | 96.50 minutes |
| Main telescope | |
| Type | Coded aperture mask |
| Focal length | 1.55 m (5 ft 1 in) |
| Collecting area | 150 cm2 (23 sq in) |
| Wavelengths | X-ray / gamma ray (γ-ray) |
| Resolution | 2 arcseconds up to 100 keV 7 arcseconds up to 400 keV 36 arcseconds above 1 MeV [2] |
| Instruments | |
| Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI) | |
 HESSI mission patch Explorer program | |
Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI, originally High Energy Solar Spectroscopic Imager or HESSI or Explorer 81) was a NASA solar flare observatory. It was the sixth mission in the Small Explorer program (SMEX), selected in October 1997 [1][7] and launched on 5 February 2002, at 20:58:12 UTC. Its primary mission was to explore the physics of particle acceleration and energy release in solar flares.
The spacecraft re-entered Earth's atmosphere at 00:21 UTC on 20 April 2023, 21 years after its launch.[5]
- ^ a b c "RHESSI (Reuven Ramaty High Energy Solar Spectroscopic Imager)". eoPortal Directory. European Space Agency (ESA). Retrieved 16 March 2021.
- ^ a b "RHESSI Mission Facts". NASA. Retrieved 3 September 2015.
This article incorporates text from this source, which is in the public domain.
- ^ "Launch Log". Jonathan's Space Report. 28 November 2021. Retrieved 3 December 2021.
- ^ Cite error: The named reference
nasa20181120was invoked but never defined (see the help page). - ^ a b "NASA Retired Solar Energy Imager Spacecraft Reenters Atmosphere". 24 April 2023.
- ^ "Trajectory: RHESSI (Explorer 81) 2002-004A". 28 October 2021. Retrieved 3 December 2021. This article incorporates text from this source, which is in the public domain.
- ^ Dennis, Brian (30 April 2009). "RHESSI - Concept to Fruition". Space Sciences Laboratory. Retrieved 15 January 2015.
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