Other
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.1301d&link_type=abstract
American Astronomical Society, DPS meeting #28, #13.01; Bulletin of the American Astronomical Society, Vol. 28, p.1115
Other
2
Scientific paper
A new control network of Mercury, based on Mariner 10 images, has been computed. Gross measurement errors were removed, camera focal lengths were modified, and improved image reseaux were used to correct camera distortions. The analytical triangulation contains 10704 measurements of 2306 points on 811 pictures. The overdetermination is 3.04, and the standard measurement error is 0.00844 mm (0.6 pixels). Mercury's radius was assumed to be 2439 km at most points, except some derived from occultation data and others from radar measurements. The focal length of camera A is 1494.3 mm and that of camera B is 1500.6 mm. The first Mariner 10 flyby of Mercury was a northern-darkside pass which obtained the best north-polar-region images. The second flyby was a southern-distant-lightside pass which covered the region between the first approach and departing images. Harmon et al. (1994) published coordinates of radar anomalies in Mercury's polar regions. These anomalies were interpeted to be ice deposits in permanently shadowed craters (Slade et al., 1992). The table below compares Harmon's coordinates with ours. Latitude differences are important because they represent differences in the pole's location. Longitude differences are not important because the points are near the poles, and because Harmon did not use the crater Hun Kal to define the 20deg meridian. References: Harmon et al. (1994) Nature, 369, 213--215; Slade et al. (1992) Science, 258, 635--640. Harmon and Davies Feature lat long(W) lat long(W) Feature lat long(W) lat long(W) C 87.4 168 87.6 175.4 Q 82.5 43 83.1 45.6 D 88.3 128 88.3 141.8 R 82.2 18 83.0 18.7 E 89.5 165 89.1 184.6 S 79.8 24 80.8 23.7 G -86.0 75 -86.1 73.2 T 79.8 20 80.8 20.0 L 85.1 68 85.5 72.9 V -80.7 86 -81.0 84.9 M 85.9 42 86.5 43.3 X -88.3 150 -88.5 142.4 N 84.8 8 85.7 8.4 Y 87.8 146 87.4 156.6 P 83.1 50 83.7 54.2
Colvin Tim R.
Davies Mike E.
Edwards Khan
Robinson Mark S.
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