Displaying items by tag: Open Cluster
A small compact open cluster. Consisting of 37 likely members, within a radius of 4 light years. Estimated age is around 10 million years making it a young cluster.
Messier 35, and NGC 2158, two open clusters located in Gemini the Twins. These are more like distant relatives. M 35 is relatively near by at only 2,800 light years, and NGC 2158 is a distant 15,000 light years away. M 35 is a young cluster at around 150 million years old, and NGC 2158 is an old 2 billion years old cluster. M 35 has an abundance of bright blueish stars that burn through their fuel at a faster rate, and only the older more yellowish survive in NGC 2158.
NGC 7510 a compressed young open cluster located in Cepheus. Some dimming of the stars due to a plume of gas and dust that is plentiful in the area.
NGC 7209 is an open cluster located in Lacerta, it consists of around 150 members with an estimated age of 420 million years. Discovers by William Herschel in October 1787.
Messier 45 is a young open cluster located in Taurus. Also know as the Pleiades, or the Seven Sisters. Visible to the naked eye, the cluster has been known since ancient times. It's curious that Charles Messier included it in his catalog of non-comet objects as there is little chance of it being confused with a comet. Originally thought the reflection nebula surrounding the stars was left over debris from their formation, but at 100 million years of age, it should have been dispersed. It is now assumed the cluster is just passing through a dust cloud. Light from the hot O type blue stars is reflected off the surrounding dust creating the reflection nebula around the stars.
The cluster contains over 1,000 stars and is around 444 light years away.
NGC 7686 an open cluster (maybe) located in Andromeda. One source says its just a chance alignment based on its HR diagram, everyone else classifies it as an open cluster. Distance 900-3,000 light years? Not a lot of info on it. Bright stars are probably not members of the cluster.
Image of part of an young emission nebula that spans 40 light years across located in Cepheus. The cluster is mostly illuminated by a star named BD+66, one of the hottest stars at 100,000 times more luminous than our sun. A young stellar nursery that is forming new stars from the clouds of dust and gas.
NGC 129 an open cluster in Cassiopeia. Contains several giant stars including the Cepheid variable star DL Cas which can used to measure its distance of around 5,300 light years. Contains 35 - 80 members and estimated age of 77 million years old.
The Double Cluster consists of two open clusters, NGC869 and NGC884 located in Perseus. Estimated age is 12.8 million years.
Although visible to the naked eye, they need optical aid to show the two individual clusters and to see them in all their glory.
NGC6885 and NGC6882 are a pair of overlapping open clusters located in Vulpecula. NGC 6885 is the small group of brighter stars, and NGC 6882 is the set of fainter stars or possibly it is Collinder 416 as there is some confusion from William Herschel observations. Age is estimated at 1.4 billion years.