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A few pics from the Spring SSP.
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The pre-order offer has expired, and only a handful of Calendars are now available, at R200 + packaging & posting.(photo: Pre-order has expired.)
A collection of pics of the beautiful total eclipse of the Moon - thanks to Ed, Wendy, Paul, Leslie, Maciej and Christine!(photo: Moon setting over the Bay, imaged at 06:05 SAST (EOS 60D, 50-mm f/3.5, ISO 640 1/3-sec))
Enthusiastic people, a beautiful setting with a lovely Moon, but alas, the wind!(photo: International Observe the Moon Night (InOMN 2015) in Gordon's Bay, South Africa)
Some pics from this morning's partial solar eclipse.(photo: Cloudy view of the partial solar eclipse.)
A partial eclipse of the Sun (Sunday, Sep 13) and a total eclipse of the Moon (Monday, Sep 28) grace our skies in September.
Update: solar eclipse photos.(photo: The Sun as seen from four ZA places: Bloemfontein, Cape Town, Durban and Johannesburg)
Photo account of our National Science Week 2015 event at Iziko Museum's Planetarium, Cape Town.(photo: Things to see and do during National Science Week 2015 in Cape Town, presented by StarPeople)
DOCdb now has constellations as a special type of "object", making planning your observing session even easier. This step-by-step guide shows how easy it is to use.(photo: How to log in)
The reduction in noise following stacking of DSLR images of stars is illustrated.(photo: HD 121228, cropped from a single frame (left) and from a stack of 17 frames (right).)
A puzzling (and worrying) feature of dark frames, taken with a Canon EOS 60D, is presented. The author is desperate for a solution!(photo: Figure 1. File size of a sequential series of 40 dark frames taken with a Canon EOS 60D (ISO 1600, 9-s exposure time, CR2 raw format).)
The effect of the number of dark frames subtracted from a light frame on the signal-to-noise ratio (SNR) of stars is investigated. The conclusion is that applying a single dark frame gives a substantial improvement in the SNR of stars, while applying additional dark frames gives only a very small improvement.(photo: Five stars selected for S/R measurement.)