SEQUOIA

Calculator Mode

  1. After selecting the desired calculator mode, press the 'Change Mode' button.

    Map Mode:
    Choose the spectral mode and the scan speed in arcsec/sec. Provide the central frequency in GHz and the size of the desired map in arcsec.
    1) RMS expected in given time. Provide the desired integration time (in minutes) and press the 'Calculate' button to determine the sensitivity in the selected units (mK or mJy).
    2) Time required for target RMS. Provide the desired sensitivity (in order to change units press the 'Units' button and select between mK or mJy). Press the 'Calculate' button to determine the required integration time.

    Position Switching (PS) Mode:
    1) RMS expected in given time. Choose the spectral mode and provide your desired integration time in minutes. Press the 'Calculate' button to determine the sensitivity in the selected units (mK or mJy). 2) Time required for target RMS. Choose the spectral mode and provide your desired sensitivity (in order to change units press the 'Units' button and select between mK or mJy). Press the 'Calculate' button to determine the required integration time.


Inputs

  1. Mode Bandwidth Channels Resolution
    N 200 MHz
    (600 km/s)    		 8192 24 kHz
    (0.072 km/s)
    I 400 MHz
    (1200 km/s)    		 4096 98 kHz
    (0.294 km/s)
    W 800 MHz
    (2400 km/s)    		 2048 391 kHz
    (1.173 km/s)

    Note: bandwidth and resolution in km/s for central frequency = 100GHz

  3. GHz (84.5-115.5 GHz)

    For central frequencies < 113 GHz, this SEQUOIA calculator considers Tsys = 100K. For higher frequencies, a value of Tsys = 300K is assumed.

  4. arcsec
  5. arcsec
  6. min