Late Summer Star Tracks

November 09, 2009

20091109 – Monday - Late Summer Star Tracks
Miguel Claro; Miguel's Web Page
Summary Author: Miguel Claro; Jim Foster

The photo above shows a Northern Hemisphere late summer view of Orion and its neighbors migrating across the early morning sky. It was taken from a farm field in Vila Boim, Alentejo, Portugal. The total exposure time is 34 minutes, beginning at 5:16 a.m. (05:16 UTC) and ending at 5:59 a.m. -- sunrise occurs at lower left. Notice that minor differences in the direction of the star and planet tracks can be observed. Tracks of Castor and Pollux and other bodies that are farther to the north of the celestial equator bend marginally to the left; whereas those to the south of the celestial equator, Sirius for example, bend slightly to the right. Those tracks near the center of the image including Betelgeuse, Rigel and M42, in the vicinity of the celestial equator, are virtually straight.

Photo details: Canon 400D camera; 68 images acquired; exposure of 30 seconds (each); aperture between F-3.5 F-5; ISO 400; 18 mm lens; combined manually in Photoshop CS3 to produce a single image along with the path of each star.