NGC 869+884. The double Cluster.

Note
First try on the double cluster. Color balance not 100%.


About
NGC 869 is an open cluster located 7600 light years away in the constellation of Perseus. The cluster is most likely around 13 million years old. It is the westernmost of the Double Cluster with NGC 884. Located in the Perseus OB1 association both clusters are located physically close to one another, only a few hundred light years apart. The clusters were first recorded by Hipparchus, but have likely been known since antiquity.

The Double Cluster is a favorite of amateur astronomers. These bright clusters are often photographed or observed with small telescopes. Easy to find, the clusters are visible with the unaided eye between the constellations of Perseus and Cassiopeia as a brighter patch in the winter Milky Way.

In small telescopes the cluster appears as a beautiful assemblage of bright stars located in a rich star field. Dominated by bright blue stars the cluster also hosts a few orange stars that add to the visual interest.
Sometimes known as h Per this designation more probably refers to a nearby dim star.










Processing
Maxim DL and CS5

Exposure
9 x 300 sec.

Calibration
Darks, bias and flats.

Filters
N/A

Cooling temp
-30´ C

Mean FWHM
3.37"

Date
September 5th 2010

Location
Krigslida, Stockholm, Sweden.
N59 06 52.4    E 18 03 54.5

Image aqusition
MaximDL Pro

Scope control
Sky X Pro Native drv, and Maxim DL with Astro-Physics V2 drv.

Telescope
WO FLT 110 DDG

Mount
Astro-Physics Mach 1 GTO

Camera
SBIG ST-8300C

Guiding
WO ZS 70 + Qcam 5 Guider

Focus system
Lakeside motorfocus.


Inverted B/W image


Star spikes version