Seite in Deutsch
| Seite in Deutsch | Frameless version of this page |
Halo occurrences around the moon are caused by clouds with thin ice crystals. A common Halo event is the 22 degree ring. It is the result of randomized orientated crystals and appears in a distance of 22 degree around the moon. The distance with 22 degrees is fixed because this crystals have the form of hexagonal prism and the moon light is refracted in an exactly defined angle in this crystals. Of course the refraction depends of the wavelength too. Red will be refracted in an angle of 21.7 degrees and purple in an angle of 22.5 degrees. But below 21.7 degrees no visible light will be refracted. So the visible impression of a ring in a distance of 22 degrees is generated.
On December 27, 2009 the cloudy sky prevented the recording of a star graze (SAO 92988) on the south pole region of the moon. The recording was calculated and planned for a place in the region of Burgschleinitz. Due to the clouds I did not make the trip. Some time later the crystals in the clouds showed this 22 degree Halo around the moon above our house. And so this images were made at home in Nonndorf.
| The moon with Halo on December 27, 2009 at 20:03 UTC |
 Objektiv Canon EF-S 17-85 IS UMS, 17mm, f=5.6, ISO 400, 15s |
| The moon with Halo on December 27, 2009 at 20:08 UTC |
 Objektiv Canon EF-S 17-85 IS UMS, 17mm, f=5.6, ISO 400, 15s |
| The moon with Halo on December 27, 2009 at 20:11 UTC |
 Objektiv Canon EF-S 17-85 IS UMS, 17mm, f=4.0, ISO 400, 15s |
| The moon with Halo on December 27, 2009 at 20:13 UTC |
 Objektiv Canon EF-S 17-85 IS UMS, 17mm, f=5.6, ISO 400, 30s |
| The moon with Halo and Plejades on December 27, 2009 at 20:14 UTC |
 Objektiv Canon EF-S 17-85 IS UMS, 17mm, f=5.6, ISO 400, 30s |
| The moon with Halo on December 27, 2009 at 20:15 UTC |
 Objektiv Canon EF-S 17-85 IS UMS, 17mm, f=5.6, ISO 400, 15s |
December 27, 2009 |
|
Site Home |
Questions and suggestions to =>