Un halo de cristal de glace autour de la lune gibbeuse cireuse se déroulant dans les étoiles d'hiver d'une nuit de janvier. Le halo à 22° est le plus évident et avec un rougeâtre et sha
7800 x 5464 px | 66 x 46,3 cm | 26 x 18,2 inches | 300dpi
Date de la prise de vue:
30 janvier 2023
Informations supplémentaires:
An ice crystal halo around the waxing gibbous Moon set in the winter stars of a January night. The 22° halo is most obvious and with a reddish and sharply defined inner rim and a bluish and more diffuse outer edge. But a faint 8° halo is also visible, a rare halo sometimes called the Van Buijsen Halo (according to Lynch and Livingston in their book Color and Light in Nature; Minnaert also mentions it in his seminal book The Nature of Color and Light in the Open Air). It is not a lens flare as shots taken with the Moon well off to one side of the frame still show the inner halo centred on the Moon. Nor is it an artifact of the exposure blending as it is present on the raw single long-exposure image. The Moon was in Taurus this night and very close to Mars, shining here just above the Moon. An occultation occured for locatons in the southern U.S. and Mexico this night, but for me in Alberta it was a very close conjunction. Orion is at lower left; Gemini at upper left; Auriga above the Moon; and Perseus is at upper right. To retain the disk of the Moon and better capture the scene as the eye saw it, this is a blend of 7 untracked exposures, from 20 seconds to 1/200 second with the RF15-35mm lens at 15mm and f/4 and Canon R5 at ISO 400. Blended with luminosity masks.
