Corona up to 6 solar radii

80 images were taken during 5 m 41 s long totality by means of a Canon EOS 5D digital camera equipped with my old well-tried Russian Maksutov-Cassegrain 6.3/500 mm. Unfortunately the absolutely clear weather several minutes before the totality was interrupted by a small cumulus cloud and a part of the total eclipse was lost. After careful inspection of all eclipse images, 38 images which were not influenced by clouds were chosen. These images were calibrated by means of about 300 dark frames and about 100 flat-field images. The resulting image is finally over my expectation and the influence of clouds nearly negligible. The position of the Moon represents the situation 136 seconds after the second contact i. e. 03:30:55 UT (15:30:55 local time). The display of the solar corona, lunar surface and stars in the resulting image are highly beyond the ability of human vision during the eclipse. The weakest stars visible in the image are of about magnitude 10. The stars are a little bit blurred by the motion of the Sun during the very long eclipse.
Click on the image or on the following reference to display the higher resolution image version (3.8 MB, PNG format).

Date22. 07. 2009
Time2nd contact 03:28:39 UT, 3rd contact 03:34:20 UT
Total eclipse duration 5 m 41 s
PlaceEnewetak Atoll, Marshall Islands
Coordinate11° 21.546' N, 162° 20.827' E, 3 m altitude
ConditionsPartially clear, partially small cumulus cloud,
altitude of the Sun above the horizon 56-57°
OpticsMaksutov-Cassegrain 3M-6A, 6.3/500 mm
CameraCanon EOS 5D digital camera (ISO 100)
Exposure1/250 s - 8 s
ProcessingComposition of 38 eclipse images. 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 3.7° clockwise to achieve standard orientation i. e. North up.
Copyright© 2009 Miloslav Druckmüller, Peter Aniol, Vojtech Rušin, Ľubomír Klocok, Karel Martišek, Martin Dietzel

Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
Page last update: 27.11.2019