STSat-1

{{Short description|South Korean satellite launched in 2003}}

{{Use American English|date=March 2021}}

{{Use dmy dates|date=February 2018}}

{{Infobox spaceflight

| name = STSat-1

| names_list = Science and Technology Satellite-1
KAISTSat-4
Korea Advanced Institute of Science and Technology Satellite-4

| image =

| image_caption =

| image_size = 300px

| mission_type = Technology, Astrophysics

| operator = KAIST Satellite Technology Research Center (SaTReC)

| COSPAR_ID = 2003-042G

| SATCAT = 27945

| website =

| mission_duration = 2 years (planned)

| spacecraft_type = STSat

| spacecraft_bus = STSat-1

| manufacturer = KAIST Satellite Technology Research Center (SaTReC)

| launch_mass = {{cvt|106|kg}}

| dimensions = 66 cm x 60 cm x 80 cm

| power = 150 watts

| launch_date = 27 September 2003,
06:11:44 UTC

| launch_rocket = Kosmos-3M (11K65M)

| launch_site = Plesetsk, Site 132/1

| launch_contractor = Yuzhnoye / NPO Polyot

| last_contact =

| decay_date =

| orbit_reference = Geocentric orbit

| orbit_regime = Sun-synchronous orbit

| orbit_periapsis = {{cvt|675|km}}

| orbit_apoapsis = {{cvt|695|km}}

| orbit_inclination = 98.20°

| orbit_period = 98.50 minutes

| apsis = gee

| instruments = Far-ultraviolet Imaging Spectrograph (FIMS)
Space Physics Package (SPP)
Data Collection System (DCS)

| programme = STSat program

| previous_mission =

| next_mission = STSat-2A

}}

The STSat-1 (Science and Technology Satellite-1), formerly known as KAISTSat-4 (Korea Advanced Institute of Science and Technology Satellite-4), is an ultraviolet telescope in a satellite. It is funded by the Korea Aerospace Research Institute (KARI), and was launched on 27 September 2003, from Plesetsk Cosmodrome by a Kosmos-3M launch vehicle,{{cite web|url=http://nssdc.gsfc.nasa.gov/spacewarn/spx600.html|title=SPACEWARN Bulletin Number 600|publisher=NASA|date=1 November 2003}} {{PD-notice}} into an Earth orbit with a height between 675 and 695 km.{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/displayTrajectory.action?id=2003-042G|title=Trajectory: Kaistsat 4 2003-042G|publisher=NASA|date=10 February 2021 |access-date=1 March 2021}} {{PD-notice}}{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2003-042G|title=Display: Kaistsat 4 2003-042G|publisher=NASA |date=10 February 2021|access-date=1 March 2021}} {{PD-notice}}

STSat-1 is a low-cost KAIST / KAIST Satellite Technology Research Center (SaTReC) satellite technology demonstration mission, funded by the Ministry of Science and Technology (MOST) of South Korea, a follow-up mission in the KITSAT program. STSat-1 is a South Korean astrophysical satellite that was launched by a Kosmos 3M launch vehicle from Plesetsk at 06:11:44 UTC on 27 September 2003. The 106 kg satellite carries a special UV imaging spectrograph to monitor gas clouds in the Galaxy. It will complete a full sky mapping in about a year, by scanning a one-degree strip every day. Additionally, it may also aim the telescope downward to image auroral displays.