NGC 225

Open Cluster NGC 225 (= CH 11 = CH 15 = H VIII.78), in Cassiopeia

Sailboat Cluster

Right Ascension 00 : 43.4 (h:m)
Declination +61 : 47 (deg:m)
Distance 2.1 (kly)
Visual Brightness 7.0 (mag)
Apparent Dimension 12 (arc min)

Discovered by Caroline Herschel in 1783.

When Caroline Herschel discovered this cluster on September 23, 1783, she added it to her list as No. 11. This discovery occurred on the same day with two others, that of NGC 189 (CH 12) and that of NGC 659 (CH 20). On an accidentally unrecognized reobservation on February 23, 1784, she added it once more under No. 15. Her brother William included it in his catalog as H VIII.78, apparently referring to her second finding as he remarked "CH 1784."

NGC 225 has been nicknamed the Sailboat Cluster by Rod Pommier in an article in Astronomy magazine.

  • Jean-Claude Mermilliod's WEBDA cluster page for NGC 225
  • SIMBAD Data of NGC 225
  • Publications on NGC 225 (NASA ADS)
  • Observing Reports for NGC 225 (IAAC Netastrocatalog)
  • NGC Online data for NGC 225


    Hartmut Frommert
    Christine Kronberg
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    Last Modification: March 11, 2009