AAUSAT-II (Aalborg University CubeSat no 2), is the second student-built CubeSat built and operated by students from Aalborg University in Denmark.^[2] It was launched 28 April 2008 05:53:51 UTC from Satish Dhawan Space Centre in India on a Polar Satellite Launch Vehicle (PSLV) launch vehicle. AAUSAT-II carries a gamma radiation sensor.

Quick Facts Names, Mission type ...

AAUSat-2

AAUSAT-II, alongside its engineering model, ahead of launch
Names	AAUSat-II Aalborg University CubeSat-2
Mission type	Technology demonstration
Operator	AAU Student Space
COSPAR ID	2008-021F
SATCAT no.	32788
Website	www.aausatii.aau.dk
Mission duration	6 months (planned) 4 years (primary) 15 years (ongoing)
Spacecraft properties
Spacecraft	Aalborg University CubeSat-2
Spacecraft type	1U CubeSat
Bus	CubeSat
Manufacturer	AAU Student Space
Launch mass	1 kg (2.2 lb)
Dimensions	10 × 10 × 11.3 cm (3.9 × 3.9 × 4.4 in)
Start of mission
Launch date	28 April 2008, 03:53:51 UTC[1]
Rocket	Polar Satellite Launch Vehicle (PSLV-CA)
Launch site	Satish Dhawan Space Centre, Second Launch Pad
Contractor	Indian Space Research Organisation
Entered service	May 2008
End of mission
Disposal	Primary mission end
Deactivated	March 2012
Orbital parameters
Reference system	Geocentric orbit[2]
Regime	Sun-synchronous orbit
Perigee altitude	615 km (382 mi)
Apogee altitude	634 km (394 mi)
Inclination	97.9°
Period	97.4 minutes
Instruments
Attitude Determination and Control System (ADCS) Gamma ray detector
Aalborg University CubeSat ← AAU CubeSat AAUSAT3 →

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The primary purpose of construction of satellites at the University of Aalborg is to give the students engineering capabilities beyond what is normally achieved within a masters program.

Student satellite activities at Aalborg University (AAU) started in 2003 as a result of AAU's involvement in the first pure Danish research satellite, Ørsted, which was successfully launched in 1999. AAUSAT-II's predecessor was AAU CubeSat which was constructed in the period 2001-2003 and was launched 30 June 2003. The project started in the summer 2003. The construction of AAUSAT-II began in 2005.

After the launch on 28 April 2008, AAUSat-2 beacon was received at Cal Poly University in California but two-way amateur radio communications could not be achieved as it turned out that AAUSat-2 was transmitting at a lower level than anticipated. After upgrades to the ground station were completed, fully functional two-way communication were achieved and continued with normal operations until May 2009 after a year of successful operation.

The ground station has remained in operation and beacons are received on a regular basis and AAUSat-2 is still considered operational - although heavy tumbling is observed (December 2009). Beacons are still received on regular basis in March 2011. In addition, AAUSat-2 does receive and acknowledge commands from ground and log files has been requested and received. Due to the very high tumbling (more than 2.5 Hz) it has not been possible to decode log files.

Below is a snapshot of the radio communication. On left side is a beacon, next a request for log is issued and AAUSat-2 reply with a transmission of the logfile. Notice the high tumbling rate.

In March 2012, the AAUSAT-II mission was officially retired by the project — but the CubeSat is still up and running. As of 2022, the satellite continues to function.^[2]

AAUSAT-II consists of several sub-systems:

• ADCS: Attitude Determination and Control System
• CDH: Command and Datahandling System
• COM: Communication System
• EPS: Electrical Power System
• GND: Ground Station
• MCC: Mission Control Center
• MECH: Mechanical System
• OBC: On-board Computer System
• P/L: Payload System

Technical Facts:

• Callsign: OZ2CUB
• Up/downlink: 437.425 MHz AFSK & FSK
• Bit rate: 1200-9600 bit/s (1200 as standard mode)
• AX.25 FM CW TLM

• List of CubeSats