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suffered a mechanical failure. This effectively ended the two X-ray experiments as they did not provide any significant data return from then on. Other experiments could still be operated through ground radio links.
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SLC-5. The cause of failure was malfunction of the third stage of the rocket, preventing the satellite from reaching orbit. ESRO-2A was similar to ESRO-2B except it weighed a little less (74 kg).
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Seven instruments were carried aboard EROS 2B designed to detect high energy cosmic rays, determine the total flux of solar X-rays and to measure
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protons. While designed for solar observations ESRO-2B is credited with the detection of X-rays from non-solar sources. The instruments were:
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with a length of 85 cm and a diameter of 76 cm. On 10 December 1968 (approx 195 days since mission start) the on-board
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and re-entered Earth's atmosphere on 8 May 1971 after completing 16,282 orbits.
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Flux and Energy
Spectra of Solar and Galactic Cosmic Ray Particles
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ESRO-2B was an 89 kg (196 lb) cylindrical
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497:"NASA – NSSDCA – Spacecraft – Trajectory Details"
283:International Radiation Investigation Satellite
411:Solar and Galactic Alpha Particles and Protons
381:, ESRO-2B had a spin rate of approximately 40
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312:which was launched in 1968. Operated by the
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359:on 17 May 1968. Its predecessor satellite,
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574:"NASA – NSSDCA – Spacecraft – Details"
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445:"NASA – NSSDCA – Spacecraft – Details"
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314:European Space Research Organisation
405:Monitor of Energetic Particle Flux
172:8 May 1971, shortly after 03:00 UT
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599:European Space Agency satellites
408:Solar and Van Allen Belt Protons
552:"ESRO 2B: May – December 1968"
255:16 May 1968, 22:09:00 UTC
225:1,086 kilometres (675 mi)
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414:Primary Cosmic Ray Electrons
215:326 kilometres (203 mi)
99:89.8 kilograms (198 lb)
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348:ESRO-2B was launched on a
527:"ESRO 2A, 2B (Iris 1, 2)"
308:spin-stabilised research
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554:. University of Indiana
190:Reference system
120:17 May 1968, 02:06:00
91:Spacecraft properties
529:. Gunters Space Page
318:astronomical surveys
594:1972 in spaceflight
501:nssdc.gsfc.nasa.gov
124:1968-05-17UTC02:06Z
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304:), was a European
185:Orbital parameters
16:Research satellite
420:Soft Solar X-rays
417:Hard Solar X-rays
354:highly elliptical
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245:98.9 minutes
235:97.2 degrees
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357:near-polar orbit
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112:Start of mission
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379:Spin-stabilised
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164:End of mission
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556:. Retrieved
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397:protons and
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44:Astrophysics
40:Mission type
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389:Instruments
365:(sometimes
328:detectors.
231:Inclination
143:Launch site
117:Launch date
96:Launch mass
588:Categories
428:References
399:cosmic ray
338:spacecraft
332:Spacecraft
194:Geocentric
169:Decay date
147:Vandenberg
472:"ESRO 2B"
310:satellite
204:Low Earth
128: UTC
65:1968-041A
61:COSPAR ID
50:Operator
558:6 March
533:6 March
481:6 March
362:ESRO-2A
352:into a
295:ESRO II
271:ESRO-2B
137:Scout B
122: (
71:SATCAT
22:ESRO 2B
368:Iris 1
301:ESRO 2
289:Iris 2
241:Period
200:Regime
133:Rocket
506:1 May
322:x-ray
251:Epoch
150:SLC-5
78:03233
560:2013
535:2013
508:2018
483:2013
476:NASA
324:and
298:(or
277:Iris
54:ESRO
383:rpm
274:or
73:no.
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280:(
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