CAS500

CAS500 (Compact Advanced Satellite 500) is a series of Earth observation satellites developed by the Korea Aerospace Research Institute (KARI).^[2][3]

CAS500-1

Mission type	Earth observation
COSPAR ID	2021-022A
SATCAT no.	47932
Spacecraft properties
Launch mass	500 kg (1,100 lb)
Dimensions	1.9 m x 1.9 m x 2.9 m
Start of mission
Launch date	22 March 2021, 06:07:12 UTC
Rocket	Soyuz-2.1a / Fregat
Launch site	Baikonur Site 31/6
Contractor	Glavkosmos
Orbital parameters
Regime	Low Earth orbit
Inclination	97.7 degrees
Period	15 orbits/day

CAS500-2

Mission type	Earth observation
COSPAR ID	TBA
SATCAT no.	TBA
Spacecraft properties
Launch mass	500 kg (1,100 lb)
Start of mission
Launch date	2025 (planned)[1]
Rocket	Falcon 9 Block 5
Launch site	TBA
Contractor	SpaceX
Orbital parameters
Regime	Low Earth orbit

CAS500-3

Mission type	Earth observation
COSPAR ID	2025-274
SATCAT no.	47932
Spacecraft properties
Launch mass	500 kg (1,100 lb)
Start of mission
Launch date	26 November 2025
Rocket	Nuri (KSLV-II)
Launch site	Naro LP-2
Contractor	KARI
Orbital parameters
Regime	Low Earth orbit

Satellites

CAS500-1, (Korean: 국토위성 1호, transl. "Land Satellite No. 1"), is a prototype 500-kilogram (1,100 lb) class Earth observation satellite that was launched by South Korea at the Baikonur Cosmodrome on 22 March 2021.^[4][5][6][7] It is in a 500-kilometre (310 mi) Sun-synchronous orbit, inclined by 97.7 degrees or 15 orbits/day.

CAS500-2 was expected to launch in 2022 also on a Russian rocket, but the launch was cancelled after the Russian invasion of Ukraine.^{[8][9][2][10]} The satellite was later rescheduled to launch together with CAS500-4 on a SpaceX Falcon 9 rocket.^[11][12][13]

CAS500-3 was launched on 26 November 2025 on the South Korean launch vehicle Nuri.^[14][15]