Object: U Camelopardalis

Constellation
RA / DEC
Magnitude
Spectral class
Colour
: Camelopardalis
: 03.42.31 / +62.40.36
: 7.7-9.5
: C3,9-C6,4e(N5) (Carbon Star)
: deep Orange
Details sketch
Date / Time
Observing Location
Seeing / Transparency
Telescope
Eye-piece
Magnification / Field of View '
: 29/12/08 / 21.00
: Landgraaf
: 2 / 4
: Orion Optics UK 300 mm
: 22 mm Nagler type 4
: 72 / 68
U Camelopardalis
Observing report
I had to locate U Camelopardalis using the RA and Dec coordinates, because this variable star is not in my Argo Navis database. Using RA/Dec with a Dobson telescope pointed near zenith proved to be quite frustrating, but once I got U Camelopardalis into the field of view, the reward was big. A wonderful deep-orange giant which stands out very well from its surroundings. The optimum magnification was the 22mm Nagler, giving a field of view of 68' and a magnification of 72x. U Camelopardalis seems to bee part of an asterism, which looks like a long neck and big head of a Giraffe. U Cam is part of the head. All in all a wonderful view.
Notes
U Camelopardalis is an SRB-type variable. SR stands for semi-variable. These stars are "Giants or supergiants of intermediate and late spectral types showing noticeable periodicity in their light changes, accompanied or sometimes interrupted by various irregularities". There are five sub-types, SRB being the giant stars. As you can see on the HR diagram below, U Cam is a cool red giant with a temperature around 2000 degrees Kelvin. The spectral type C (which consists of the R and N type) can be found in the M-type area.
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