Angular diameter of the asteroids Vesta and Pallas determined from speckle observations.
Abstract
The technique of speckle interferometric measurement of asteroids is applied to Vesta and Pallas, yielding diameters of 550 i 23 and 673+55 km, respectively. The improved Vesta speckle diameter is in excellent agreement with other measurements for Vesta. However, the derived Pallas diameter is slightly larger than other measurements. This is perhaps attributable to systematic errors arising as an object's angular diameter nears the seeing disk size. It is also pointed out that it is necessary to carefully normalize and center speckle frames before applying the autocorrelation ,cross-correlation subtraction method developed by Worden et al. [Icarus 32, 450 (1977)].
- Publication:
-
The Astronomical Journal
- Pub Date:
- January 1979
- DOI:
- 10.1086/112400
- Bibcode:
- 1979AJ.....84..140W
- Keywords:
-
- Astronomical Photometry;
- Diameters;
- Interferometry;
- Speckle Patterns;
- Vesta Asteroid;
- Angular Distribution;
- Angular Resolution;
- Asteroids;
- Astronomical Photography;
- Autocorrelation;
- Cross Correlation;
- ASTEROIDS;
- VESTA;
- PALLAS;
- SPECKLE TECHNIQUES;
- INTERFEROMETRY;
- OBSERVATIONS;
- REDUCTION;
- DIAMETER;
- IMAGERY;
- TELESCOPIC OBSERVATIONS;
- TELESCOPIC PHOTOGRAPHY;
- Astronomy; Asteroids;
- Diameters:Minor Planets;
- Minor Planets:Speckle Interferometry