Objects for Visual Astronomy in Light Polluted Skies - Content


As I live in a large city in central Europe with heavy light pollution I concentrate on objects good visible against not this dark skiesmainly double stars and open clusters.


This is a living site containing my session plans with many pages far from being completed and most pages will change within one season as ideas regarding content and format change and thus also some links may not yet be active.


My long term project is the observation of all known double stars of interest suited for my equipment (means scopes with single digit aperture in inches) coming over the year into my field of view (south-east to north-west) in a reasonable altitude of above 35° giving in total about estimated 5.000 objects (~500 so far observed) and additionally the constellations Sgr and Sco as targets during vacation trips in the summer. The double stars are selected from the Washington Double Star catalog currently per mid 2013 (this means that the data may have to be checked for recent changes, especially if the existence of a known "Orbit" is indicated) and arranged by star hopping routes within constellations. The session plans consist in average of about 20 objects each with their easy to understand basic parameters means discoverer designation, separation and magnitudes. Multiples are according to WDS practice listed as several doubles if the other components besides AB are of interest. As additional information the for resolution proposed aperture in mm is indicatedbased on another long term project of mine: Developping an Rule of Thumb algorithm for calculating a proposed average aperture in mm for resolving unequal binaries. Some rare comments (especially for doubles with dubious advertised data) are in German language but these should pose no problem if not understood.

The session plans are complemented by star maps for my setup (means with Alt/Az-rotation and horizontal flip) and my location for the planned observation period. This maps might be of use also for other locations and observation times but will need then some accordingly rotation. The maps per session plan are also provided as PDF-file for printing. For some session plans also links to Excel sheets, SkyCommander files, AstroPlanner documents or SkySafari lists with the content of the session plan are given. Long term I intend to do this for all plans.


After some years of double star observing it seems time to resume as compact as possible the current state of my "insights" regarding visual resolution of double stars with "small" telescopes: http://www.sterngucker.eu/PDF/On%20resolution%20of%20double%20stars.pdf.


Wien, 2015-07-01/Wilfried Knapp




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