The SpaceX Dragon spacecraft launched on its maiden flight on December 08, 2010, beginning a series of demonstration missions as part of NASA’s Commercial Orbital Transportation Services (COTS) programme. The mission, known as Dragon C1, launched from Cape Canaveral atop a Falcon 9 rocket at 15:43 UTC. During the flight four cubesats were deployed from the “trunk” section of the Dragon spacecraft.

CAERUS is USC’s 1st nano-satellite subsystem delivered in May 2010, and was named after the greek word for “opportunity”. It was developed from authorization to proceed (ATP) to delivery in 14 weeks. CAERUS is part of the “MAYFLOWER” Next Generation Technology Nanosatellite that is a joint effort with Northrop Grumman NOVAWORKS group. It is a 3U-size CubeSat with propulsion that has eight Pumpkin deployable solar panels unfurled into a single array.

NASA-Catalog: 37252

Beacon437.600 MHz 1k2 AFSK, FM, 900 mW Telemetriesignal CAERUS 1k2 AFSK




Dec 22, 2010: decayed

Dec 14, 2010: Due to operational considerations, the beacon will be off except in certain conditions and at variable event times which will not be predicted. Whereas tracking of the beacon is possible over the next few weeks, it is improbable.

Dec 08, 2010: First-day on-orbit telemetry from Caerus/Mayflower indicated that all systems were operating normally.

Orbital Parameter

Name                   MAYFLOWER
NORAD                  37252
COSPAR Bezeichnung     2010-066-J  
Inklination (Grad)     34.528
RAAN                   88.482
Excentrizität          0.0011285
ARGP                   8.251
Umläufe pro Tag        16.32182276
Periode                1h 28m 13s (88.22 Min)
Semi-major axis        6565 km
Perigäum x Apogäum     179 x 194 km
Mean Anomaly           351.831
  • “1U” form factor structural integration of two complete RF subsystems, with 2 separate micro-processors (PIC24’s)
  • Fully qualified in Thermal Vacuum and 3-Axis Vibration
  • New Antenna Module validated in the UltraLab RF Chamber on USC Campus
  • Burn in with over 100 hours for Flight Software and Telemetry Systems
  • Integration of 3 new Technologies (new Quad monopole deployable antenna, an RF splitter, and burn wire mechanism)
  • Built and integrated by professionals and students at SERC


00:47 KE5RDY-1/TCPIP>CQ>UI,?,F0 (1199 baud):
00:47 KE5RDY-1/TCPIP>CQ>UI,?,F0 (1199 baud):
00:47 KE5RDY-1/TCPIP>CQ>UI,?,F0 (1199 baud):
00:47 KE5RDY-1/TCPIP>CQ>UI,?,F0 (1199 baud):
00:48 KE5RDY-1/TCPIP>CQ>UI,?,F0 (1199 baud):
00:48 KJ6FIX-1/TCPIP>CQ>UI,?,F0 (1199 baud):

09.12.2010, 00:46 UTC Thanks to Tetsu san, JA0CAW


decoded packet:
Total length: 59
Unused: 0x00 0x00
Time: 12/8/10-2-13:27:10
Reboots: 86
Last Reboot Cause: 0
Flash Status: 16
Bit 0 = 0 : Device is ready.
Bit 1 = 0 : Device is NOT write-enabled.
Bit3&4= 1 : All sectors software-protected.
Bit 4 = 1 : WP is deasserted.
Bit 5 = 0 : Last op successful.
Bit 7 = 0 : Sector Protection Registers unlocked.
Radio Status: 64
No detailed Radio info yet
TLM Pointer: 320046
PLY Pointer: 2356688
Last Sent Command: 0x08 0xa2 0xf0 0x54 0x90 0x26 0x82 0x1c 0xc7 0xc6 0xd0 0x22 0xf9 0xf8 0x01
Time: 4/16/10-4-16:3:36
Gyro Rates Data Bytes: 0x20 0x80 0xa5 0xc0 0x7f 0xbf
Gyro Rates (deg/s): A: 2.34432 B: 12.0879 C: -9.450541
Gyro Rates New Data Flags: A: true B: true C: true
Gyro Rates Error Flags: A: false B: true C: false
Gyro Temp Data Bytes: 0x8b 0x80 0xbd 0xc0 0xb9 0x80
Gyro Temps (deg C): A: 45.1967 B: 52.4617 C: 51.8805
Gyro Temps New Data Flags: A: true B: true C: true
Gyro Temps Error Flags: A: false B: true C: false
Total count: 59 (Should be 83 or 59)

Ken, W7KKE heard the first beacon from CAERUS on 437.600MHz (1k2 AFSK every 10 sec) at 20:25 UTC (Dec 08, 2010)

QSL Telemetry

Homepage und weitere Informationen

QSL Card