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| Eta Cassiopeia is a wonderful double star with a striking colour contrast which seems to depend on the observer. Its primary is yellow (or golden) while the seventh-magnitude companion is red (or perhaps purple?).
The companion orbits its primary every 480 years and according to its orbit it is presently at a position angle of 317º and a very wide separation of 13", a separation which is slowly growing even wider. Finding eta is no problem as it is in the same field of view as alpha Cassiopeiae: binoculars. |
