Contains: NGC 884, Double cluster, NGC 869, The star 7Per
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Double cluster in Perseus (NGC 869 and NGC 884)

Technical card

Imaging telescope or lens: Celestron CPC 800 XLT

Imaging camera: Canon 600D

Focal reducer: Celestron f/6.3 Focal Reducer

Software: Adobe Photoshop Express for AndroidSequator

Resolution: 5202x3465

Dates: Feb. 9, 2018

Frames: 40x30" ISO800

Integration: 0.3 hours

Darks: ~10

Flats: ~10

Avg. Moon age: 23.80 days

Avg. Moon phase: 32.83%

Bortle Dark-Sky Scale: 6.00

Astrometry.net job: 1922817

RA center: 35.119 degrees

DEC center: 57.180 degrees

Pixel scale: 0.687 arcsec/pixel

Orientation: 292.606 degrees

Field radius: 0.596 degrees

Locations: Home Stockport, Stockport, Cheshire, United Kingdom

Description

Double cluster in Perseus imaged with a Celestron CPC800 equipped with a focal reducer f/6.3 and a Canon 600D prime focus. 40x30s frames @ 800 ISO stacked with Sequator with 10 darks and 10 flats.

The diffraction spikes, unexpected with a Schimdt-Cassegrain, are the unintended consequence of the trunk and branches of the tree through which I was imaging!

From Wikipedia:
The Double Cluster (also known as Caldwell 14) is the common name for the open clusters NGC 869 and NGC 884 (often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus. Both visible with the naked eye, NGC 869 and NGC 884 lie at a distance of 7500 light years.[2] NGC 869 has a mass of 3700 solar masses and NGC 884 weighs in at 2800 solar masses; however, later research has shown both clusters are surrounded with a very extensive halo of stars, with a total mass for the complex of at least 20,000 solar masses. Based on their individual stars, the clusters are relatively young, both 12.8 million years old. In comparison, the Pleiades have an estimated age ranging from 75 million years to 150 million years. There are more than 300 blue-white super-giant stars in each of the clusters. The clusters are also blueshifted, with NGC 869 approaching Earth at a speed of 39 km/s (24 mi/s) and NGC 884 approaching at a similar speed of 38 km/s (24 mi/s). Their hottest main sequence stars are of spectral type B0.

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Author

michele vonci
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Double cluster in Perseus (NGC 869 and NGC 884), 




    

        michele vonci

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