ESA title
ESEO artist impression

Be the first to catch a signal from ESEO

03/12/2018 5456 views 32 likes
ESA / Education / ESEO

It is time to prepare to listen to space. To celebrate the launch of the European Student Earth Orbiter (ESEO), ESA’s Education Office challenges the amateur radio community to listen out to be first to hear the new spacecraft orbiting Earth. 

ESEO will be launched today, 3 December 2018, from the Vandenberg Air Force Base, as part of the Spaceflight’s SSO-A rideshare launch; spacecraft separation and activation is scheduled at about 2 hours 13 minutes after launch. 

About two minutes after being deployed into its final orbit, ESEO will begin transmitting with its beacon signals to Earth that can be picked up by anyone with common amateur radio equipment. ESA challenges anyone to send to  the recording of the signal of the 437.00 MHz signal received from ESEO during its pass in visibility of their ground station.


For one week after the ESEO launch, the first email coming from each continent (America, Africa, Europe, Asia, Oceania, Antartica), sent by radio-amateurs who recorded the signals received from ESEO, for which the signal recorded is confirmed to belong to ESEO, will be awarded an official ESA Education shirt of the ESEO mission.

More information about ESEO can be found here.

ESEO was launched on 3 December 2018, 19:34 CET.

You can find the TLEs here

ESEO UHF Beacon Information:

Frequency: 437.00 MHz

Transmission Format: See attachment 1

Modulation Format: GFSK


Beacon schedule:

  • Every 1 minute when in safe mode and just after deployment during the de-tumbling phase
  • Every 1 minutes when in sunlight
  • Every 5 minutes when in eclipse


Beacon Types (transmitted cyclically):

  1. General
  2. Power System
  3. OBDH
  4. AOCS and sensor/actuator
  5. FDIR and TMTC
  6. Payload

Additional beacon (not in nominal rotation): Emergency

Telemetry equations: See attachment 2

Destination Address is: ESEO 

Source Address is: IW4DUL 

The following information is stored in every packet sent from the spacecraft in the Address part of the message, as per AX.25 protocol. 

 First Byte 
Destination Address Subfield  Source Address Subfield 
A1 A2 A3 A4 A5 A6 A7  A8 A9 A10 A11 A12 A13 A14 
Byte  ASCII 

Bin Data 

MSB           LSB 

Hex Data 
A1  10001010  8A 
A2  10100110  A6 
A3  10001010  8A 
A4  10011110  9E 
A5  Space  01000000  40 
A6  Space  01000000  40 
A7  SSID  01100000  60 
A8  10010010  92 
A9  10101110  AE 
A10  01101000  68 
A11  10001000  88 
A12  10101010  AA 
A13  10011000  98 
A14  SSID  01100001  61 

What your email should contain:

  • An IQ recording in a recognised format
  • Your Name
  • Your Callsign (if any!)
  • Snailmail address for delivery of your polo shirt
  • Reception time of the beacon
  • Details of any telemetry decoded
  • Your Location
  • A few lines about your equipment


*Attachements will be uploaded latest on Monday, 19th November 2018.