# Okean-O1 / Tselina-D-derived bus
*bus . products*

Okean-O1 spacecraft platform used by the Sich-1/Okean-O1-8 ocean-observation satellite.

## Specifications
- **product status**: retired
- **deployment context**: orbital
- **manufacturer**: yuzhnoye
- **bus**: {"power_w":300,"notes":"WMO gives 300 W power for SICH-1; Gunter describes the Okean-O1 series as based on the Tselina-D bus.","platform_class":"large"}
- **entity type**: bus
- **last verified date**: 2026-06-26
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: yuzhnoye
- **mass kg**: 1950
- **power gen w**: 300
- **attributes**: {"kind":"bus","product_status":"retired","deployment_context":"orbital","manufacturer":"yuzhnoye","description":"Okean-O1 spacecraft platform used by the Sich-1/Okean-O1-8 ocean-observation satellite.","bus":"{\"power_w\":300,\"notes\":\"WMO gives 300 W power for SICH-1; Gunter describes the Okean-O1 series as based on the Tselina-D bus.\",\"platform_class\":\"large\"}"}
- **relevance**: in-scope

## Editorial
Okean-O1 / Tselina-D-derived bus is the spacecraft platform associated with Sich-1, also named Okean-O1-8, an ocean-observation satellite. Sich-1 was the eighth Okean-O1 flight unit, with operational oceanography as its main mission.[^wmo-sich-1] The satellite had 1,950 kg launch mass and 300 W power, so this bus application is treated as a large platform.[^wmo-sich-1] The Okean-O1 platform carries Tselina-D-derived heritage.[^gunter-okean-o1]

## Compositional position
- sich-1 (missions) --[mission_buses]--> Okean-O1 / Tselina-D-derived bus

## Sources
- [wmo-sich-1] | WMO OSCAR satellite record: SICH-1 | https://space.oscar.wmo.int/satellites/view/sich_1 | tier=agency-doc | accessed=2026-06-26 | author=World Meteorological Organization
- [gunter-okean-o1] | Okean-O1 / Sich 1, Gunter Space Page | https://space.skyrocket.de/doc_sdat/okean-o1.htm | tier=community | accessed=2026-06-26 | author=Gunter D. Krebs
  Used only as heritage cross-check for Okean-O1/Tselina-D naming.

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Source: https://eo-atlas.org/products/bus/okean-o1-bus
Maintainer: SpectraWorks B.V. (CC-BY 4.0)