Corona up to 4 solar radii

This image is very similar to this image. It is made from the same data sets. The only difference is that the 640 mm focal length William Optics lens image set was used as the main image set and the other sets were aligned with this set. That is why the resulting image has wider field of view.
The image contains a lot of very fait stars some of them very near to the Sun. The magnitude limit is about 11. The stars are not round because the Sun is moving rather fast among the stars - about 1° per day. The star trails are of different length because every image part consists of different images taken in different time. The trails of bright stars are usually longer because they are recorded on more images than the faint stars. Some stars are double dots which look like caused by images misalignment. It is not the reason is again Sun movement.
The full resolution image is here.
Click on the image or on the following reference to display the higher resolution image version (1.9 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) William Optics FLT 110 mm APO F/7.0 + field flattener, focal length 760 mm
(2) Rubinar 10/1000 mm
(3) GSO RC 8'', Ritchey-Chrétien F/8, 203 mm/1624 mm
Camera(1) Canon EOS 5D Mark II digital camera (ISO 100)
(2,3) Canon EOS 5D digital camera (ISO 100)
Exposure(1) 1/500 s - 8 s
(2) 1/125 s - 8 s
(3) 1/500 s - 2 s
ProcessingComposition of 120 eclipse images (26 (1), 33 (2) 61 (3)). 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 3.78° 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