| タイトル | Planetary observations with the Tidbinbilla interferometer |
| 著者（英） | Jauncey, D. L.; Rayner, P. T.; Gulkis, S.; Batty, M. J. |
| 著者所属（英） | Commonwealth Scientific and Industrial Research Organization|Jet Propulsion Lab., California Inst. of Tech. |
| 発行日 | 1980-01-01 |
| 言語 | eng |
| 内容記述 | Radio observations at a wavelength of 13.1 cm of Saturn and Uranus made with the Tidbinbilla interferometer during 1978 and 1979 are summarized. The observations were made with 64-m and 26-m antennas on a 200-m north-south baseline at a bandwidth of 12 MHz with RCP polarization and a primary beamwidth of about 12 arcmin. A flux density of 198 + or - 15 mJy was measured for Saturn, which indicates a surface temperature, corrected for the occulting effect of the rings, of 191 + or - 15 K, in excellent agreement with previous determinations. With the use of a background subtraction technique to remove the local background confusion, Uranus was found to have a flux density of 11.7 + or - 0.8 mJy, indicating a disk-averaged brightness temperature of 255 + or - 18 K. The increase in Uranus brightness temperature over that measured 15 years previously is attributed to variations in temperature or opacity below the cloud tops, or to a reduction in relative ammonia abundance most likely reflecting a change in the aspect of the planet as viewed from earth. |
| NASA分類 | ASTRONOMY |
| レポートNO | 81A27057 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/417521 |
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