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  • 1
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    Unknown
    Absolute brightness temperature measurements at 3.5-mm wavelength (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Careful observations have been made at 86.1 GHz to derive the absolute brightness temperatures of the sun (7914 + or - 192 K), Venus (357.5 + or - 13.1 K), Jupiter (179.4 + or - 4.7 K), and Saturn (153.4 + or - 4.8 K) with a standard error of about three percent. This is a significant improvement in accuracy over previous results at millimeter wavelengths. A stable transmitter and novel superheterodyne receiver were constructed and used to determine the effective collecting area of the Millimeter Wave Observatory (MWO) 4.9-m antenna relative to a previously calibrated standard gain horn. The thermal scale was set by calibrating the radiometer with carefully constructed and tested hot and cold loads. The brightness temperatures may be used to establish an absolute calibration scale and to determine the antenna aperture and beam efficiencies of other radio telescopes at 3.5-mm wavelength.
    Keywords: ASTRONOMY
    Type: IEEE Transactions on Antennas and Propagation; AP-28; May 1980
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Results from the Orbiting Astronomical Observatory. XLI - Photometry of M31 and M33 (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Filter photometry observations from the Orbiting Astronomical Observatory, in six wavelength bands between 1550 and 4250 A, are reported for several positions along the major and minor axes in M31 and at some positions in M33. The spatial resolution is 10 arcmin. The colors along the major axis of M31 within about 20 arcmin of the nucleus are similar to the nucleus; at 45 arcmin the colors are much bluer, indicating a spiral arm population. This behavior is expected from other observations of H I, CO, and early-type stars, which are all concentrated in a ring of material whose inner edge is about 7 kpc (= 35 arcmin) from the nucleus. The center of M33 is bluer than the ring of M31, and the arms of M33 even bluer. There are no colors too blue to be explained (within observational error) by unreddened B stars.
    Keywords: ASTRONOMY
    Type: Astronomical Journal; 87; June 198
    Format: text
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    NASA TECHNICAL REPORTS
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