Corona up to 9 solar radii and comet

This image shows the extend and shape of the solar corona in the middle of unusually long and deep solar activity minimum.
About 715 images taken with two cameras were used for the creation of this eclipse image. 52 images were taken during the eclipse, all others were calibration images (dark frames, flat-field images) taken immediately after the eclipse. 30 eclipse images were taken with Canon EOS 1D Mark III equiped with 400 mm lens, which is equivalent to 520 mm lens for a full-frame camera. 22 images were taken with Canon EOS 350D equipped with Maksutov-Cassegrain of 500 mm focal length, which is equivalent to 800 mm for a full-frame camera. The position of the Moon represents the situation 62 seconds after the second contact i. e. 11:04:37 UT (18:04:37 local time).
Comet C/2008 O1 (SOHO) is visible in this image like in our more wide-angle 200 mm lens image.

Click on the image or on the following reference to display the higher resolution image version (2.0 MB, PNG format).

Date01. 08. 2008
Time2nd contact 11:03:35 UT, 3rd contact 11:05:39 UT
Total eclipse duration 2 m 4 s
PlaceMongolia, Bor Udzuur
Coordinate45° 43.251' N, 92° 06.837' E, 1223 m altitude
ConditionsExcellent - clear sky, altitude of the Sun above the horizon 22°
OpticsCanon EF 100-400 mm 1:4.5-5.6 L IS set to 400 mm (Canon EOS 1D Mark III)
Maksutov-Cassegarin 3M-6A, 6.3/500 mm (Canon EOS 350D)
CameraCanon EOS 1D Mark III (ISO 100)
Canon EOS 350D (ISO 100)
Exposure1/100 s - 8 s (Canon EOS 1D Mark III)
1/125 s - 8 s (Canon EOS 350D)
ProcessingComposition of 52 images (30 images Canon EOS 1D Mark III, 22 images Canon EOS 350D). 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, LDIC 5.0, Corona 4.1, Sofo ACC 6.1
NoteThe graph above the table shows the average values of the relative number of sunspots in which the red line indicates the time of 2008 eclipse. The data from the World Data Center for the sunspot index, (Solar Influences Data Analysis Center, the Royal Observatory of Belgium) were used.
OrientationImage must be rotated 10.5° clockwise to achieve standard orientation i. e. North up.
Copyright© 2008 Miloslav Druckmüller, Martin Dietzel, Peter Aniol, Vojtech Rušin

Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
Page last update: 7.4.2013