2 CVn

[darthvader]

I was observing a few objects in Canes Venatici with help from the  'Turn Left at Orion' book and noticed that the description of 2 CVn appears to be wrong (or I am colourblind). 

The book on pg 113 states that 2 CVn (blue) has a yellow 9th mag companion 11" to the E. I think this is the wrong way round and the 9th mag companion is blue and 2 CVn is yellow.

 

[chiltonstar]

In her book, Sissy Haas quotes CVn A as brick red, and CVn B as silvery sapphire (I think I remember the primary as red with my ED80, but saw the secondary as lilac.)

(Note - The colours appear to vary with observer & scope, but the primary star is Type F2V, the secondary A0; this implies that the primary should always be redder than the secondary.)

Chris

[lunator]

I agree with Chris, this is one of those pairs that seem to vary. I was them as orange and yellow. I will have another look soon. 

Cheers

Ian

[cotterless45]

I've found that you usually get more colour with smaller aperture. Try sticking the end cap on and removing the small cap, make sure this is opposite the focuser,

Nick.

[Patbloke]

Mmmm first special 'target' tonight then :-)

[laudropb]

I noted them as orange/red and yellow. Colours really do seem to be very subjective.