Corona up to 5 solar radii

This image was made from data obtained by means of two different optical systems. The first one was my old but excellent Russian Maksutov-Cassegrain 3M-6A, 6.3/500 mm. The second one was new GSO Ritchey-Chrétien with 203 mm diameter and 1624 mm focal length. Both equipped with computer controlled (Linux Fedora Multican program made by Jindřich Nový) Canon EOS 5D cameras. The equipment was placed on a massive ultra-precise Astelco NTM 500 mount. During the totality 64 (3M-6A) and 89 (GSO) images were taken with both cameras. Because the sky was not absolutely clear during the whole totality it was necessary to remove all images significantly influenced by clouds. It was especially complicated task for wide angle 500mm focal length optics. Finally 23 (3M-6A) and 61 (GSO) images were chosen. These images were calibrated by means of over 1000 dark frames and flat-field images. The position of the Moon represents the situation 157 seconds after the second contact. It is possible do identify over 130 stars down to magnitude 11 in this wide angle image.
Click on the image or on the following reference to display the higher resolution image version (2.2 MB, PNG format).

Date11. 07. 2010
Time2nd contact 18:45:36 UT, 3rd contact 18:50:05 UT
Total eclipse duration 4 m 29 s
PlaceTatakoto Atoll, French Polynesia
CoordinateS 17° 20' 39.3'',   W 138° 27' 3.1'',  Alt. 6 m
ConditionsPartially clear, partially thin clouds
Optics(1) Maksutov-Cassegrain 3M-6A, 6.3/500 mm
(2) GSO RC 8'', Ritchey-Chrétien f/8, 203 mm/1624 mm
Camera(1,2) Canon EOS 5D digital camera (ISO 100)
Exposure(1) 1/250 s - 8 s
(2) 1/500 s - 2 s
ProcessingComposition of 84 eclipse images (23 (1), 61 (2)). Eclipse images calibrated by means of dark frames and flat-fields, aligned by means of phase correlation, composed by means of LDIC 5.0 software, processed using Corona 4.1 in order to visualize coronal structures. Final processing was done using ACC 6.1 software.
Image processing by Miloslav Druckmüller
SoftwareAstro D3F 2.0, PhaseCorr 6.0, MPA 1.0, LDIC 5.0, Corona 4.1, Sofo ACC 6.1
OrientationImage must be rotated 6.25° anti-clockwise to achieve standard orientation i.e. solar north up.
Copyright© 2010 Miloslav Druckmüller, Martin Dietzel, Shadia Habbal, Vojtech Rušin

Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
Page last update: 1.8.2014