Eyesat-1

Eyesat-1 / AMRAD OSCAR 27
Spacecraft properties

Mission type	Amateur radio satellite
Operator	AMRAD
COSPAR ID	1993-061C
SATCAT no.	22825^[1]
Website	AO27.net
Mission duration	Elasped: 30 years and 7 months


Bus	Microsat
Manufacturer	Interferometrics Inc.
Launch mass	11.8 kg (26 lb)
Dimensions	15 cm × 15 cm × 15 cm (5.9 in × 5.9 in × 5.9 in)


Start of mission
Launch date	26 September 1993, 01:45 UTC^[2]
Rocket	Ariane-40 V59
Launch site	Kourou ELA-2
Contractor	Arianespace


Orbital parameters
Reference system	Geocentric
Regime	Low Earth
Eccentricity	0.00202^[2]
Perigee altitude	794 km (493 mi)^[2]
Apogee altitude	823 km (511 mi)^[2]
Inclination	98.5°^[2]
Period	101 minutes^[2]
Epoch	26 September 1993^[2]

OSCAR ← OSCAR 26 OSCAR 28 →

Eyesat-1 is an American experimental communications microsatellite with an store-dump payload. The mission of Eyesat-1 was experimental monitoring of mobile industrial equipment. Eyesat-1 has provided the National Oceanic and Atmospheric Administration in Silver Spring, Maryland, with communication services to the South Pole. Eyesat-1 carries an FM repeater for Amateur Radio Research and Development Corporation (AMRAD) called AMRAD OSCAR 27 or OSCAR 27.^[2]

Eyesat-1 was launched on September 26, 1993 using an Ariane 4 rocket at Guiana Space Centre, Kourou, French Guiana, along with SPOT-3, Stella, Healthsat-2, KITSAT-2, Itamsat and PoSAT-1.

After 19 years of operation, the satellite suffered a bus failure on December 5, 2012. This failure caused the high-level software to lockup. Several years were spent trying to work around the problem, but a solution was not found.

In early 2020, the satellite was recovered by writing a new operating system in 80186 assembly that could work around the bus failure, and its FM repeater became intermittently operational.^[3]

As of 19-April-2023 AO-27 is still working.^[4]

Frequencies

Uplink: 145.850 MHz^[4]
Downlink: 436.797 MHz^[4]

External links

AMRAD OSCAR 27 - The Radio Amateur Satellite Corporation

References

^ n2yo.com. "EYESAT 1". Retrieved 13 February 2020.{{cite web}}: CS1 maint: numeric names: authors list (link)
^ ^a ^b ^c ^d ^e ^f ^g ^h NASA Goddard Space Flight Center. "EYESAT 1". NSSDCA Master Catalog. Retrieved 13 February 2020.
^ "AO-27 Returns from the Dead". AMSAT. 24 May 2020. Retrieved 26 September 2020.
^ ^a ^b ^c "AO-27 Status". AO27.net. 19 April 2023.

OSCAR satellites

Satellites

OSCAR 1
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v t e ← 1992 Orbital launches in 1993 1994 →
January	Kosmos 2230 Molniya 1-85 STS-54 (TDRS-6) Kosmos 2231 Soyuz TM-16 Kosmos 2232
February	USA-88 Kosmos 2233 SCD-1, Orbcomm CDS-1 Kosmos 2234, Kosmos 2235, Kosmos 2236 Asuka Progress M-16
March	Gran' No.42L EKA-1 UFO F-1 Kosmos 2237 USA-90, SEDS-1 Kosmos 2238 Progress M-17
April	Kosmos 2239 Kosmos 2240 Kosmos 2241 STS-56 (SPARTAN 201) Kosmos 2242 Molniya-3 No.57 ALEXIS, Orbcomm CDS-2 STS-55 Kosmos 2243 Kosmos 2244
May	Kosmos 2245, Kosmos 2246, Kosmos 2247, Kosmos 2248, Kosmos 2249, Kosmos 2250 Astra 1C, Arsene USA-91 Resurs-F2 No.9 Progress M-18 Molniya-1T No.81 Gorizont No.39L
June	Kosmos 2251 STS-57 Kosmos 2252, Kosmos 2253, Kosmos 2254, Kosmos 2255, Kosmos 2256, Kosmos 2257 Galaxy 4 Resurs-F1 No.57 Radcal USA-92, PMG
July	Soyuz TM-17 Kosmos 2258 Kosmos 2259 USA-93 Kosmos 2260 Hispasat 1B, INSAT-2B
August	Unnamed, Unnamed, Unnamed, SLDCOM-3 Molniya-3 No.58 NOAA-13 Kosmos 2261 Progress M-19 Resurs-F1 No.56 USA-94 Meteor-2 No.24, Temisat
September	USA-95 Kosmos 2262 STS-51 (ACTS, ORFEUS-SPAS) Kosmos 2263 Kosmos 2264 IRS-P1 SPOT-3, Stella, KITSAT-2, Itamsat, Eyesat-1, PoSAT-1, Healthsat-2 Gran' 41L
October	Landsat 6 FSW-15 Progress M-20 STS-58 Intelsat 701 Kosmos 2265 USA-96 Gorizont No.40L
November	Kosmos 2266 Kosmos 2267 Gorizont No.41L Solidaridad 2, Meteosat 6 USA-97
December	STS-61 USA-98 Telstar 401 DirecTV-1, Thaicom 1 Molniya 1-87
Launches are separated by dots ( • ), payloads by commas ( , ), multiple names for the same satellite by slashes ( / ). CubeSats are smaller. Crewed flights are underlined. Launch failures are marked with the † sign. Payloads deployed from other spacecraft are (enclosed in parentheses).