I made a sky cam with a DMK31usb camera and a 24mm f1.8 Zuiko lens. First light during a whole observing session, about 8h of video, 1 image every minutes. The aim is sky monitoring during observation, detection of cloud and in the future, detection and...

Following the study of HeII4686, here is the HeI 5876 extracted from an order of an eshell spectrum of 9600s exposure and sampled to 3600s and 7200s for comparison. SNR is better than in the blue region, normal with the better sensitivity of the ccd,...

Here is a study of the HeII4686 profile variation depending of the exposure time of WR134, a wolf rayet star subject of a 2013 pro am campaign from the Convento group The SNR requirement on 1hour exposure for this campaign is about 200. The resolution...