The following table contains a compilation of beam pattern measurements from the 12m telescope. In most cases, these measurements are images of planets observed in beam-switched mode using the On-The-Fly technique. For planets which are not point sources relative to the main diffraction beam, one must deconvolve the planet from these images in order to obtain the true beam characteristics.
| Freq (GHz) | Source | Date Observed | Thetaeq X Thetapol (arcsec) | Thetamb (arcsec) | Format | |
|---|---|---|---|---|---|---|
| Notes | ||||||
| 72.4 | Mars | 05/30/97 | 9.3x9.3 | 86.8 | jpg | fits |
| BS OTF image. Good image. Beam throw residuals about 5% of peak. Jpeg image scaled to emphasize low-level structure. Scanned at 20"/sec with a 30" row spacing. Throw correction = 1.014; angle correction = +0.66 deg; beam amplitude correction = 0.997 | ||||||
| 86.2 | Mars | 03/28/97 | 14.0x14.0 | 72.9 | jpg | fits |
| BS OTF image. Good image. Beam throw residuals about 1% of peak. Jpeg image scaled to emphasize low-level structure. Throw correction = 0.988; angle correction = +0.77 deg; beam amplitude correction = 0.997 | ||||||
| 218.2 | Mars | 05/29/97 | 9.3x9.3 | 28.8 | jpg | fits |
| BS OTF image. Scanned at 20"/sec with 8" row spacing. Good image. Beam throw residuals about 5% of peak. Mars size is a significant fraction of the beam size, so be cautious when using this for a beam image! Jpeg image scaled to emphasize low-level structure. Throw correction = 1.071; angle correction = -0.04 deg; beam amplitude correction = 1.000 | ||||||
