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c14

Double Cluster
Object
Cat.
Const
Type
Common Name
RAHrs
RAMins
DecDeg
DecMin
vMag
Size
C14
NGC 884 & NGC 889
Perseus
Open Cluster
Double Cluster
02
20
57
08
4.3
1 deg

chartt.jpg
Chart

The Double Cluster is the common name for the naked-eye (OK you will need Binoculas in light polluted areas such as Crayford) open clusters NGC 884 and NGC 869, which are close together in the constellation Perseus. NGC 884 and NGC 869 are at distances of 7600 and 6800 light-years away, respectively, so they are close to one another in space as well.
They are relatively young clusters, with NGC 869 5.6 million years and NGC 884 at 3.2 million years according to the 2000 Sky Catalogue. In comparison, the Pleiades have an estimated age ranging from 75 million years to 150 million years.
They are also blueshifted, with NGC 869 approaching Earth at a speed of 22 km/s and NGC 884 approaching at a similar speed of 21 km/s. Their hottest main sequence stars are of spectral type B0.

c14_jt01t.jpg
Bagged by: Julian Tworek
Method:AstroTrac Canon 100-400 lens @ 200mm ISO800, 9 x 120s self modified Canon 20D DSLR
Special Features: Eaisly visible from a dark site without any optical aide
Click on image for full size image


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Page edited 2 times. Last edit by - SimonTelescopium SimonTelescopium on May 31, 2010 2:12 am. This site contains 560 pages
CMHASD - c14