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SETI System Performance At 10 Light Years

9006-022

 

9006-022a

 

Parameter

Microwave Infrared Visible
Wavelength 0.20 m 10.6 m 656 nm 488 nm
Frequency, Hz 1.50 X 109 2.83 X 1013 4.57 X 1014 6.15 X 1014

TRANSMITTERS
Diameter, m 300 10 10 10
Gain, dB 73.5 129.4 153.6 156.2
Power, W 1,000 1,000 1,000 1,000
EIRP, W 2.22 X 1010 8.78 X 1015 2.29 X 1018 4.14 X 1018

 

1 Astronomical Unit (A.U.) = 1.496 X 1011 m.

1 Light Year (L.Y.) = 9.461 X 1015 m.

1 Light Year (L.Y.) = 63,242 A.U.

1 Parsec (psc) = 3.26 L.Y.

 

9006-022b

 

Parameter

Microwave

Infrared Visible
Wavelength 0.20 m 10.6 m 656 nm 488 nm
Frequency, Hz 1.50 X 109 2.83 X 1013 4.57 X 1014 6.15 X 1014

RECEIVERS
Diameter, m 300 10 10 10
Gain, dB 73.5 129.4 153.6 156.2
Beam Dia., A.U. 430 0.684 0.043 0.032
Intensity, W/m2 1.99 X 10-25 7.74 X 10-20 2.04 X 10-17 3.71 X 10-17
Signal, W 1.41 X 10-20 6.08 X 10-18 1.60 X 10-15 2.91 X 10-15
Magnitude ----- ----- +23 +22

 

1Apparent Stellar Magnitude of reflected Planckian light from alien planet.

2Signal-To-Planck Ratio at the heterodyned I.F. frequency is based on a noise spectral density of 2Npl, and no separation (resolution) of alien star and planet.

3Signal-To-Daylight Ratio (per pixel) at the heterodyned I.F. frequency.

4Maximum Doppler shift due to motion of Earth around the Sun.

5Maximum Doppler shift chirp for transmitter/receiver in geosynchronous orbit.

9006-022c

 

Parameter

Microwave

Infrared Visible
Wavelength 0.20 m 10.6 m 656 nm 488 nm
Frequency, Hz 1.50 X 109 2.83 X 1013 4.57 X 1014 6.15 X 1014

RECEIVERS
Quantum Effic. ----- 0.5 0.5 0.5
Temperature, K 10 2,700 44,000 59,100
Planck, W/m2.Hz* 8.80 X 10-33 1.07 X 10-25 2.74 X 10-24 1.77 X 10-24
Stellar Magnitude ----- ----- +2 +2
1Planet Magnitude ----- ----- +24 +24
SNR, dB/Hz* 20.0 22.1 34.2 35.5
2SPR, dB/Hz* 71.0 55.7 65.8 70.2
3SDR, dB/Hz* ----- 51 106 107
4Doppler Shift, Hz 1.5 X 105 2.8 X 109 4.6 X 1010 6.2 X 1010
5Orbital Chirp, Hz/s 1.1 X 100 2.1 X 104 3.4 X 105 4.6 X 105

 

 * Polarized

 

The Columbus Optical SETI Observatory
Copyright (c), 1990

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