This photo was shot from Drassa Greece on Oct. 4th 2016
Click on it for a higher resolution view
The Double Cluster (also known as Caldwell 14) is the common name for the naked-eye open clustersNGC 869 and NGC 884 (often designated h Persei and χ Persei, respectively),[1] which are close together in the constellation Perseus. NGC 869 and NGC 884 both 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.[3] Based on their individual stars, the clusters are relatively young, both 12.8 million years old.[4] 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).[5] Their hottest main sequence stars are of spectral type B0
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Photo Details and instruments used:
4-10-2016 Drassa-Greece
12x600"
15 Flat15 Bias
45 Dark
QHY8l -15°
F:500mmMount:AZEQ6GT
Click on it for a higher resolution view
The Double Cluster (also known as Caldwell 14) is the common name for the naked-eye open clustersNGC 869 and NGC 884 (often designated h Persei and χ Persei, respectively),[1] which are close together in the constellation Perseus. NGC 869 and NGC 884 both 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.[3] Based on their individual stars, the clusters are relatively young, both 12.8 million years old.[4] 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).[5] Their hottest main sequence stars are of spectral type B0
--------------------------
Photo Details and instruments used:
4-10-2016 Drassa-Greece
12x600"
15 Flat15 Bias
45 Dark
QHY8l -15°
F:500mmMount:AZEQ6GT