Geo-IK

Geo-IK
Type:	Earth surveying satellite
Country:	Soviet Union
Mission dates
Dimensions:	≈ 1550 kg
Size:	3.0 x 2.04 m
Begin:	First start January 23, 1981 (failure)
Starting place:	Plesetsk
Launcher:	Cyclone-3
Orbit data
Orbit inclination :	≈ 82.6 or 73.6 °
Apogee height :	≈ 1540 km
Perigee height :	≈ 1500 km

Geo-IK ( Russian Гео-ИК , also Musson-Eridan, GRAU index : 11F666) is the name for Russian earth survey satellites .

They are the successors of the Sfera series and were used to determine the shape of the gravitational field and thus also the shape of the earth and an exact coordinate system. They also supported the development of a global position system. The first successful launch of a series satellite (Kosmos-1312) took place on September 30, 1981 with a Zyklon-3 rocket from the Plesetsk cosmodrome . The cylindrical satellites are based on the KAUR-1 satellite bus and have a height of 3.00 m and a diameter of 2.04 m. The total length with passive gravity stabilization boom is 17.8 m, the diameter with extended solar collectors 7.5 m. They were developed by the NPO PM from Zheleznogorsk (Krasnoyarsk) . Five systems were installed for the geodetic analyzes. A 9.4 GHz radar provides altitude information above the sea surface with an accuracy of 3 to 5 m. A two-frequency Doppler system (150 MHz and 400 MHz) with 1 to 3 cm / s accuracy works up to 12 hours per day and an additionally activated 5.7 / 3.4 GHz transponder with an accuracy of 3 to 5 m. In addition, laser reflectors with a total area of ​​0.024 m² are installed on the space probe and enable distances to be determined with an accuracy of 1.5 m. The payload also includes a flashlight, which can produce a series of nine strong flashes of light with a frequency of 1/3 Hertz up to 55 times per day. Like the similar device on Sfera, it was used to very precisely determine the position of the satellite in the night sky using photography. The satellites have a lifespan of one to two years. The last remaining satellite ceased operations on February 5, 1999.

Satellites

A total of 14 satellites were launched before the series was replaced by Geo-IK-2 satellites .

Surname	Start date	Launch complex	Production number	Takeoff weight kg	COSPAR name	NORAD ID	Orbit inclination	Rotation time min	Perigee km	Apogee km
-	January 23, 1981, 2:20 pm	32/1	11	1596	-	-	82.60 °	Orbit not reached
Cosmos-1312	September 30, 1981, 1:00 p.m.	32/1	12	1588	1981-098A	12879	82.61 °	115.99	1536.8	1511.6
Cosmos-1410	24 September 1982, 12:15	32/1	13	1547	1982-096A	13589	82.62 °	115.99	1521.9	1499.9
Cosmos-1510	November 24, 1983, 3:33 pm	32/2	14th	1550	1983-115A	14521	73.63 °	116.08	1540.5	1506.8
Cosmos-1589	August 8, 1984, 3:08 pm	32/2	15th	1554	1984-084A	15171	82.60 °	116.00	1522.7	1499.4
Cosmos-1660	June 14, 1985, 1:36 pm	32/1	17th	1556	1985-047A	15821	73.64 °	116.11	1537.8	1499.2
Cosmos-1732	February 11, 1986, 9:56 am	32/2	16	1557	1986-015A	16593	73.61 °	116.08	1544.4	1499.0
Cosmos-1803	December 2, 1986, 10:00	32/1	18th	1552	1986-094A	17117	82.61 °	116.05	1526.8	1502.6
Cosmos-1823	February 20, 1987, 7:43 am	32/2	19th	1545	1987-020A	17535	73.62 °	116.08	1544.2	1498.8
Cosmos-1950	May 30, 1988, 11:00 am	32/1	21st	1548	1988-046A	19195	73.61 °	116.10	1541.5	1504.7
Cosmos-2037	August 28, 1989, 3:14 am	32/2	20th	1548	1989-068A	20196	73.58 °	116.12	1537.5	1502.8
Cosmos-2088	July 30, 1990, 3:06 am	32/1	22nd	1556	1990-066A	20720	73.61 °	116.12	1543.7	1503.7
Cosmos-2226	December 22, 1992, 3:36 pm	32/2	23	1536	1992-092A	22282	73.64 °	116.07	1537.6	1497.7
Geo-IK	November 29, 1994, 5:54 am	32/2	24	1522	1994-078A	23411	73.62 °	116.10	1545.0	1498.9

Web links

• Gunter's Spage Page: Geo-IK (English)
• Academician MF Reshetnev: Geo-IK (English)

Individual evidence

1. ↑ ^{a b} Geo-IK in the Encyclopedia Astronautica (English)
2. ↑ ^{a b} космодрома "Плесецк"
3. ↑ Russianspaceweb: Geo-IK (Musson) satellite
4. ↑ Global security: GEO-IK