Stellar Data

A timelapse of about 2 and a half hours (left) shows a sample of whole sky ASHI stellar images recorded from a desert site near San Diego, CA. The ASHI images are centered near 33 degrees declination, and start at about 9h 30m right ascension. Polaris can be seen in the upper right portion of the image while the Big Dipper is located in the middle and the bright Venus can be seen on the right. Background light shows up on the edges coming from San Diego, Los Angeles, and passing by vehicles are present on the perimeter of the images; streaks are from an occasional airplane passing overhead during the exposures. Normally, a single, small flat mirror would be seen in the upper right of the image, capturing any stars coming in from the lower left that the fisheye is unable to view. The image (bottom right) displays the mirror superimposed in the location in which it would align with the fisheye for a continuous 90 degree view.