The central star in the downstroke of the ‘Y’ is a double, magnitudes about 11.1 and 11.7, separation a little bit less than a minute. It consists of only seven to ten stars (five, according to A&H), all of which are considerably brighter than the background stars. Despite the ‘not well detached’ classification, this object is much easier to discern than NGC 146. Its classification is given by Archinal & Hynes as IV1p (not well detached, stars all of similar brightness, poor). NGC 133 was discovered in 1865 by Heinrich d’Arrest. There is a background scatter of stars of magnitude 15 to 17, and it’s presumably these that make up the numbers. ![]() Although this classification is given by Archinal & Hynes, they also give its population as 132 stars. The Trumpler classification for NGC 146 is II2p (detached with little central condensation, medium range of stellar brightnesses, poor (fewer than 50 stars)). The double star mentioned by Herschel comprises two 11th mag stars separated by about 6.5”. It (just about) reveals itself as a loose scatter of 11th and 12th magnitude stars between three brighter stars that make up a long, narrow triangle. My own observation states that if I hadn’t known it was there, I would have completely overlooked it. Through the telescope, NGC 146 is distinctly underwhelming. He also added that the position he gives is that of the double star h1033 which is a member of the cluster. At the time, he described it as A loose cluster stars magnitude 11 and 12, 10’ diameter, a description that remained intact through to the 1888 NGC. The first to be discovered was NGC 146, by John Herschel in 1829. This link will open a larger version of this image in a new window. It has to be said from the start that none of these objects is visually stunning, but they have an interesting story to tell.Īn annotated version of an image of the open clusters NGC 133, NGC 146 and King 14 provided by Martin C Germano. The three clusters are NGC 133, NGC 146 and King 14. Three of these clusters form a triangle, 12’ to a side, just 15’ north-northwest of the magnitude 4.1 star kappa Cas. Straddling the Milky Way, Cassiopeia is rich in open clusters, many of which form a near-continuous band across the top of the familiar ‘W’ asterism. High in the northern October sky stands the familiar ‘wonky wubbledoo’ of Cassiopeia. This month, we’ll be looking at a group of three open clusters which have been considered as a genuine cluster triplet, and a slightly challenging planetary nebula. Magnitude 6.4 diameter 13' RA 01h 19.Open clusters in Cassiopeia and a planetary nebula in Cetus October 2021 - Nebula and Cluster of the Month Its stars appear to beĪrranged in chains. One of the brightest open clusters in the sky andĪn attractive object for small telescopes. 23h 24.2m, Dec +61° 35'Ī fan-shaped cluster with at least 40 stars. ![]() Kidney-shaped, containing over 100 stars, with a Nebulosity associated with Gamma Cas, consisting Stars in Cassiopeia brighter than magnitude 4.0 Magnitude: 18.3 apparent dimensions: 60' × 60'. An open cluster in the central region, called Melotteġ5, contains some stars up to 50 times as massive as the Sun. ![]() The brightest part of the nebula – the bright region near theĬenter – is classified separately as NGC 896, because it was the first The Heart Nebula (IC 1805) is an emission nebula located in the Perseus Arm of our galaxy in Cassiopeia. See below for details of the constellation's brightest It lies near Cepheus and not far from the north celestialĪ binocular sweep of the region is rewarding (especially aroundĭelta Cas) and small instruments reveal an interesting assortment of nebulaeĪnd open clusters. Cassiopeia (abbreviation: Cas), the Queen, mother of Andromeda, is a large northern constellation with a distinctive "W" shape marked by five stars of the third magnitude,Īnd with the Milky Way as a backdrop.
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