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Summary

Description
English: Launched on 17 May 1968, ESRO-2B had an elliptical orbit with (initially) apogee 1086 km, perigee 326 km, and inclination 97.2 degrees. The orbital period was 98.9 minutes. It was the first successful ESRO satellite launch. ESRO (European Space Research Organisation), was the forerunner of ESA. ESRO-2B was also known as Iris. The satellite was mainly intended to study X-ray and particle emissions from the Sun, however, it is credited with some extra-solar observations. The spacecraft was cylindrical in shape, with a 0.76 m diameter and a 0.85 m height. It weighed 80 kg. The failure of the on-board tape recorder in December 1968 (after roughly 6.5 months of operation) was catastrophic for the 2 X-ray experiments. They did not provide any significant data return after that time. The satellite reentered the atmosphere on 8 May 1971.
Français : Lancé le 17 mai 1968, le ESRO-2B a une orbite elliptique avec (au début) 1086 km d'apogée, un périgée de 326 km, et une inclinaison 97,2 degrés. La période orbitale est de 98,9 minutes. Il a été le premier lancement réussi d'un satellite de l'ESRO. Également connu sous le nom d'Iris. Le satellite a été principalement destiné à l'étude des rayons X et les émissions de particules provenant du Soleil, cependant, il est crédité de quelques observations solaire supplémentaires. La sonde est de forme cylindrique, avec un diamètre de 0,76 m et une hauteur de 0,85 m. Il pesait 80 kg. L'échec de l'enregistement des données en décembre 1968 (après environ 6,5 mois d'activité) a été catastrophique pour les deux expériences de rayons X. Ils n'ont pas fourni de données important après cette date. Le satellite rentre dans l'atmosphère le 8 mai 1971.
Date
Source NASA's HEASARC: Observatories, Goddard Spaceflight Center
Author HEASARC Director: Dr. Alan P. Smale HEASARC Associate Director: Dr. Roger Brissenden Responsible NASA Official: Phil Newman Web Curator: Meredith Gibb
Permission
(Reusing this file)		 Images produced by NASA are usually free of copyright [...]

The satellite carried seven instruments to detect high energy cosmic rays, determine the total flux of solar X-rays, and measure trapped radiation, Van Allen belt protons and cosmic ray protons. There were 2 X-ray instruments: one designed to detect 1-20 Angstroms (consisting of proportional counters with varying window thickness) and one designed to detect 44-60 Angstroms (consisting of proportional counters with thin mylar windows). While geared primarily for solar observations, the detectors are credited with the detection of non-solar X-ray sources.

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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inception

26 June 2003

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Date/TimeThumbnailDimensionsUserComment
current19:56, 16 July 2012Thumbnail for version as of 19:56, 16 July 2012576 × 411 (155 KB)U5K0larger image from http://heasarc.gsfc.nasa.gov/Images/esro/esro-2b.gif
23:26, 12 September 2009Thumbnail for version as of 23:26, 12 September 2009348 × 248 (56 KB)Marshallsumter{{Information |Description={{en|1=Launched on 17 May 1968, ESRO-2B had an elliptical orbit with (initially) apogee 1086 km, perigee 326 km, and inclination 97.2 degrees. The orbital period was 98.9 minutes. It was the first successful ESRO satellite launc

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