E-mail for Telemetry data:

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.

Key Characteristics:

- "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

General Information:  CAERUS was USC's 1st satellite subsystem put into space.  It is a "1U Cubesat" that fits with a 2U Cubesat to make up a complete 3U when launched.  

Launch and Initial Orbit Information: Launch Date estimated to be November 18th 2010 from Cape Canaveral FL.  Estimated orbital ephemeris is as follows:

Inclination: 34.51 (deg)

RAAN: 96.44 (deg)

Eccentricity: 0.0010873

Argument of Perigee: 237.60 (deg)

Mean Anomaly: 195.89 (deg)

Mean Motion: 15.9109 (revs/day)

Communication Systems Information:  CAERUS uses amateur satellite band.  The following information is required to recieve information from the CAERUS satellite:


Beacon Downlink Frequency:  437.600 MHZ, 25kHz bandwidth

Beacon Output Power:  900mW

Antenna:  Quad Monopole

Modulation Type:  CW

Modulation Frequency:  Approximately every 10 seconds a beacon pulse is sent, except over the Ground station at USC (Los Angeles CA).

Data Analysis Information:  Go to following link for the telemetry protocol for both analyzing the information packets, and for a small JAVA script that will automatically decode it for you.CAERUS Telemetry Data & QSL Card

Please send any/all information packets recieved (raw only) to the following e-mail address with the word "Pass" in the title of the e-mail:

SPECIAL REQUEST FOR UNIVERSITIES and RESEARCH INSTITUTES: USC's Department of Astronatics is conducting an experiment to update the two-line element set using Beacon information only.  The CAERUS student team are measuring the Doppler frequency shift during the beacon pass and recording it real time using a Spectrum Analyzer for post processing.  Would like to invite other Universities around the globe to participate in this experiment to update this Cubesat's TLE using doppler frequency measurements, to send this information to the Caerus e-mail address with "Doppler" in the title to allow the USC student team to increase the fidelity of the estimates.

To help us perform the satellite orbit determination/correction, please kindly provide the following information when CAERUS passes your station: your ground station information, each beacon’s received time (local time), and its received frequency.  An example is listed below.


USC CAERUS Received Frequencies Report

• Station Name: USC

• Station City, State, Country: Los Angeles, CA, U.S.A.

• Latitude: 34.0194º

• Longitude: -118.287º

• Elevation: 100 meters

• Frequency Measurement Equipment Brand Name and Model #: TBD

• Equipment measurement-noise (if known): TBD

Beacon #

Received Frequency


Time Received

(GMT or 24hr local time identified)