Selection of Open Clusters on Parameters and Available Measurements

This form helps answering questions like: Is there any cluster with right ascension between 5 and 7 hours, north of declination +25 degrees, with a diameter larger than 20 arc minutes and more than 50 stars measured in the uvby system?

Parameter Lower Upper Units
A) The kind of comparison:
Right Ascension in hour and minute
more than stars

Declination in degree and minute
less than stars

Longitude in decimal degree
between and stars
Latitude in decimal degree
B) The kind of data:
Distance in parsec
Distance modulus in magnitude
Colour excess in magnitude
Age in logarithm of the age
Distance Z in parsec
Diameter in minute of arc


This form offers the possibility of selecting clusters on the basis of their parameters and available observations.
Enter values for the limits relevant to the chosen parameters.
Select one of the three comparison items and enter the relevant limit(s).
Select the type of data you are interested in.
The form usage offers further explanations on its use.

Last update: 27 October 2005