The Efficiencies of the 45-m Radiotelescope in 2011-2012 Observing Seasons

Measured between November - December 2011


    
    
    Reciver

    Frequency
[GHz]
    HPBW
[arcsec]
    Main Beam
Effic [%]
    Aperture
Effic [%]
    Calib.
source
    EL
    comments
      
    
    
      

      
    
    S80
    86
    19.2+-0.2
    34+-2
    27+-1
    Mars
    49 - 50
    
      
    
    3C279
    34 - 38
      
    
    110
    16.3+-0.3
    27+-2
    18+-1
    Mars
    35 - 42
    
      
    
    3C279
    46 - 47
      
    
    115
    15.6+-0.1
    22+-2
    15+-1
    Saturn
    46 - 49
    
      
    
    3C279
    43 - 45
      
    
    

      

      
    
    S100
    86
    18.4+-0.3
    38+-2
    32+-2
    Mars
    49 - 50
    
      
    
    3C279
    34 - 38
      
    
    110
    15.6+-0.3
    36+-3
    26+-2
    Mars
    35 - 42
    
      
    
    3C279
    46 - 47
      
    
    115
    15.2+-0.3
    29+-2
    20+-2
    Saturn
    46 - 49
    
      
    
    3C279
    43 - 45
      
    
    

      

      
    
    T100(H)
    86
    18.9+-0.3
    43+-3
    35+-2
    Mars
    48 - 46
    
      
    
    3C279
    39 - 42
      
    
    110
    17.3+-0.3
    43+-3
    35+-2
    Mars
    46 - 42
    
      
    
    3C279
    39 - 42
      
    
    115
    16.6+-0.5
    33+-3
    19+-2
    Mars
    50 - 49
    
      
    
    3C279
    48 - 46
      
    
    

      

      
    
    T100(V)
    86
    19.2+-0.2
    40+-2
    30+-2
    Mars
    48 - 46
    
      
    
    3C279
    39 - 42
    
      
    
    110
    16.2+-0.2
    40+-2
    30+-2
    Mars
    46 - 42
    
      
    
    3C279
    39 - 42
      
    
    115
    14.6+-0.4
    30+-2
    23+-1
    Mars
    48 - 46
    
      
    
    3C279
    48 - 46
      

    
    
      
    
    *) Slightly modified on May 22, 2013.
      
    
    **) The values for TZ1(V) at 86 GHz should be similar to the corresponding values of the TZ1(H) receiver.

The error of the efficiencies is mainly due to uncertainty of brightness temperature of the planet.

Brightness Temperatures (T_b) of the Source (We used temperatures compiled by Shibata 1990)

115 GHz: 155+-11 K (Interpolation of the values at 2.1 mm and 3.1 mm)
110 GHz: 153+-11 K (Interpolation of the values at 2.1 mm and 3.1 mm)
86 GHz: 153+-5 K

Mars 210 K (assumed based on compiled data by Shibata, 5 % error is also assumed)
The brightness temperature of Mars is known to change depending on the distance to the Sun (R). According to Ulich (1981), the approximate formula to obtain effective Tb is Tb(effective) = Tb x (1.524 AU / R)^1/2. The value of R is taken from Japanese Ephemeris.

Diameter of the Planet

^1/2

References

Shibata, Internal Memorandum: Brightness temperatures of Venus, Mars, and Saturn (1990)
Japanese Ephemeris, Maritime Safety Agency of Japan (2011)

2012-02-09

Reciver	Frequency [GHz]	HPBW [arcsec]	Main Beam Effic [%]	Aperture Effic [%]	Calib. source	EL	comments

S80	86	19.2+-0.2	34+-2	27+-1	Mars	49 - 50
					3C279	34 - 38
	110	16.3+-0.3	27+-2	18+-1	Mars	35 - 42
					3C279	46 - 47
	115	15.6+-0.1	22+-2	15+-1	Saturn	46 - 49
					3C279	43 - 45

S100	86	18.4+-0.3	38+-2	32+-2	Mars	49 - 50
					3C279	34 - 38
	110	15.6+-0.3	36+-3	26+-2	Mars	35 - 42
					3C279	46 - 47
	115	15.2+-0.3	29+-2	20+-2	Saturn	46 - 49
					3C279	43 - 45

T100(H)	86	18.9+-0.3	43+-3	35+-2	Mars	48 - 46
					3C279	39 - 42
	110	17.3+-0.3	43+-3	35+-2	Mars	46 - 42
					3C279	39 - 42
	115	16.6+-0.5	33+-3	19+-2	Mars	50 - 49
					3C279	48 - 46

T100(V)	86	19.2+-0.2	40+-2	30+-2	Mars	48 - 46
					3C279	39 - 42
	110	16.2+-0.2	40+-2	30+-2	Mars	46 - 42
					3C279	39 - 42
	115	14.6+-0.4	30+-2	23+-1	Mars	48 - 46
					3C279	48 - 46

*) Slightly modified on May 22, 2013.
**) The values for TZ1(V) at 86 GHz should be similar to the corresponding values of the TZ1(H) receiver.

The Efficiencies of the 45-m Radiotelescope during 2011-2012