The Moonrise on October 18, 2008

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On October 18, 2008 a recording of a star occultation caused by an asteroid was planned on the evening. But because of the moonrise above a ridge in the Northeast about 30 minutes before I mounted the DSLR Canon 20D on the Newton telescope and made images.

The ridge was in a distance of about 11 kilometers. Because my own position was on 550m MSL and the ridge on a level of 650m MSL the real horizon was raised about 0.5 degrees. So the moonrise occurred some time later than calculated.

The exposure data:
Camera:       DSLR Canon EOS 20D
ISO:          400
Focal length: 1200mm (Newton Primärfokus)
f-stop:       4.72   (1200/254)
Exposure:     2.0s to 1/125s

Haze and clouds on the horizon were visible as dark stripes on the red moon surface. Also the wood on the ridge was visible clearly. The moon limb was strongly deformated by the air turbulences. Later than the moon was high enough above the horizon the image got stable and the colour changed from red to the typical moon gray.

The earthmoon rising on northeast horizon on October 18, 2008 at 18:06 UT

Exposure time = 2.0s

The earthmoon rising on northeast horizon on October 18, 2008 at 18:07 UT

Exposure time = 2.0s

The earthmoon rising on northeast horizon on October 18, 2008 at 18:09 UT

Exposure time = 2.0s

The earthmoon rising on northeast horizon on October 18, 2008 at 18:13 UT

Exposure time = 1/2s

The earthmoon rising on northeast horizon on October 18, 2008 at 18:15 UT

Exposure time = 1/5s

The earthmoon rising on northeast horizon on October 18, 2008 at 18:47 UT

Exposure time = 1/125s

© 2008 G. Dangl