CAS500-1, or Compact Advanced Satellite 500-1 (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.^[2][3] It is in a 500-kilometre (310 mi) Sun-synchronous orbit, inclined by 97.7 degrees or 15 orbits/day.

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	2021-022A
SATCAT no.	47932
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	2021-022A
SATCAT no.	47932
Spacecraft properties
Launch mass	500 kg (1,100 lb)
Start of mission
Launch date	2024 (planned)
Rocket	Nuri(KSLV-II)
Launch site	Naro LP-2
Contractor	KARI
Orbital parameters
Regime	Low Earth orbit

CAS500-4

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	2025 (planned)[1]
Rocket	Falcon 9 Block 5
Launch site	Cape Canaveral SLC-40
Contractor	SpaceX
Orbital parameters
Regime	Low Earth orbit

CAS500-5

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	2025 (planned)
Rocket	TBA
Launch site	TBA
Contractor	TBA
Orbital parameters
Regime	Low Earth orbit