Represents the jewels from the handle of Perseus’ sword, Total mass of at least 20,000 solar masses. Mosaic of 3 LRGB images. NGC 869, also known h Persei, is on the left, with NGC 884, also designated chi Persei, on the right. First Light Guides #10 and #11 are a combined guide, as both NGC 869 and NGC 884 would be wonderful objects to observe on their own. There are no faint gases to show off, and no spiral arms to enhance. The Double Cluster in Perseus. Magnitude 3.7 and 3.8. The Double Cluster occupies a total area of 60 arc minutes of apparent sky, which is twice the size of a full Moon. Français : Le double amas de Persée , est constitué de deux amas ouverts : NGC 884 et NGC … The star 7Per . Apparent size: 60′ English: The double cluster, in the constellation Perseus, is constituted of two open clusters: NGC 884 and NGC 869. Both clusters are blueshifted: NGC 869 is approaching us at a speed of 39 km/s, while NGC 884 is moving in Earth’s direction at 38 km/s. If the Double Cluster were as close to us as the Pleiades (444 light years), it would occupy a quarter of the northern sky and contain some of the brightest stars visible from Earth. The cluster is most likely around 12.5 million years old. Together they are commonly known as the "Double Cluster" and form a famous showpiece object, that's easily visible to the naked eye and a wonderful sight in binoculars and telescopes. Image: Lukáš Kalista. NGC 869 and NGC 884 both lie at a distance of 7500 light years. In mythology, the Double Cluster represents the jewelled handle of Perseus’ sword, given to the hero by the gods, along with a shield and a helmet, to help him in his challenges. Also named Caldwell 14 or simply “The Double Cluster”, both star clusters are very similar to each other in size, magnitude, and age. Both are visible with the naked eye. Age: 12.8 million years Normal Inverted monochrome Large size Full size User. The final image is a result of 6 frames at 105s exposure each, processed in DeepSky Stacker. Double Cluster (h and Chi Persei). The star 7Per . August 16, 2020. They are a beautiful sight when observed through binoculars or instruments and many individual stars can be resolved if using a large telescope. Description: The Constellations Handbook is a logical guide to learning the 88 constellations. This image shows the Double Cluster in the constellation of Perseus. Open clusters NGC 884 and NGC 869 form the Double Cluster in … The clusters are relatively young at 5.6 and 3.2 million years old respectively. Each cluster contains more than 300 blue-white supergiants and their hottest stars on the main sequence belong to the spectral class B0. Distance: 7,600 light years (2,300 parsecs) Declination: +57°09′ These two are among the youngest star clusters known. Starlight Express MX-916 on 3.5" Questar. NGC 884 is a Open Cluster in the Perseus constellation.NGC 884 is situated north of the celestial equator and, as such, it is more easily visible from the northern hemisphere. NGC 957 is much smaller and really isn't that impressive looking, but it is always nice to add an extra deep sky object in your image if you can! Even under moderately dark skies, the double cluster in the constellation of Perseus is easily seen with the naked eye. We've also included a few cool facts about each target, a map to find it in the night sky, and more! A telescope will reveal an immense number of faint stars, and a brighter center in each object. NGC 884 is somewhat farther away, at 8,150 light years. NGC 869. The western component of the pair, h Persei, entry 689 in the New General Catalogue (NGC 689), is about 5.6 million years old, while Chi Persei (NGC 884) is closer to 3.6 million years old. The best estimate for the age of NGC 869 is 6.4 million years, while NGC 884 is about 11.5 million years old. The Double Cluster (also known as Caldwell 14) consists of the open clusters NGC 869 and NGC 884 (often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus. That is relatively close-by (the Milky Way galaxy has a diameter of roughly 100,000 light years.) Although their discovery surely predates written history, the Greek astronomer Hipparchus notably cataloged the "double cluster". The Double Cluster is the name for two open clusters – NGC 869 and NGC 884 – located close together in Perseus constellation. Magnitudes are given without a decimal point, e.g. Estimated age: 13 million years Astronomers number its age to a few million years, i.e. Apparent magnitude: +3.8 Both are very similar to each other in size, magnitude, and age. There are some blue giants in here too. Learn how to find each object in the night sky, and read our recommendations on imaging them in a quick and comprehensive way. We analyze eight sources with strong mid-infrared excesses in the 13 Myrold double cluster h and χ Persei. Image: Roberto Mura. The clusters are about 7,500 light-years from us. NGC884 and NGC869 both lie at a distance of 7500 light years. You want to make sure that you play with the settings and run some tests until the stars on the mask are either only background stars or cluster stars, not both. The Double Cluster (NGC 869 and NGC 884) in Perseus. Learning the constellations is difficult. We imaged the Double Cluster after spending three hours on the Bubble Nebula (NGC 7635). The clusters were likely formed in the same star forming cloud in the Perseus Arm of the Milky Way and both belong to the Perseus OB1 association, a group of extremely massive stars. NGC 884 NGC 869 and NGC 884 can be found 7,500 light-years away in the constellation Perseus. In comparison, the Pleiades cluster (Messier 45) has an estimated age between 75 and 150 million years. Both are very similar to each other in size, magnitude, and age. These are catalog numbers in the New General Catalogue of celestial objects, fist established by John Dreyer in 1888. NGC 884 (also known as χ Persei) is an open cluster located 7600 light years away in the constellation of Perseus. Each target in this guide contains our advice on imaging, photos of expected results, and a useful information table. This pair of open clusters lie about 7,000 light-years away from Earth. a relatively young cluster. The Double Cluster, is NGC 884 and NGC 869, a group of two open star clusters in the Perseus constellation.It has many blue and red stars. Designations: Double Cluster, Caldwell 14, NGC 869 and NGC 884, h Persei and χ Persei, Right ascension: 02h 19.1m We analyze eight sources with strong mid-infrared excesses in the 13 Myrold double cluster h and χ Persei. The Double Cluster (h and Chi Persei; NGC 869 and NGC 884) consists of two young open clusters that lie close together in the sky in Perseus and are visible to the naked eye on a clear, dark night as a hazy patch of light. Another cluster, NGC 957, is visible in the vicinity of the Double Cluster. That is relatively close-by (the Milky Way galaxy has a diameter of roughly 100,000 light years.) We show that the material with T~300-400 K andLd/L*~10-4 to 10-3 producesthe excesses in these sources. L=R+G+B, R=G=B=96 secs (in 12 sec increments). The Red, Green and Blue filters are only used to grab the colors for the image. Both visible with the naked eye, NGC 869 and NGC 884 lie at a distance of 7,500 light years. The Luminance filter was used for longer than the other three as this is where almost all the details come from. The Double Cluster has been known since ancient times, but first catalogued only around 130 BC, when the Greek astronomer Hipparchos mentioned it as a “nebula” or “cloudy spot” in his writings. Discover which star clusters, nebulae, and galaxies are the easiest and most impressive to photograph for each season. The position of h Persei’s is Right Ascension: 2h 19m; Declination: 57 o 9′ north The Double Cluster is officially known as NGC 869 and NGC 884. Keep an eye out for a Version 2 of our Double Cluster with either a wider telescope or the same instrument but guided and with am expected total exposure time of 2 to 3 hours. NGC 869 & NGC 884 - The Double Cluster in Perseus. NGC 869 and NGC 884 lie at a distance of 7,500 light years. There is a little heiroglyphic character at the heart of NGC … The Double Cluster can be spotted in the middle of an imaginary line that links the Cassiopeia star Ruchbach, and the star Miram in the constellation of Perseus. NGC 869 and NGC 884 both lie at a distance of 7500 light years. NGC 869 & NGC 884 The Double Cluster LRGB Post by Astrovetteman » Thu Nov 07, 2019 12:23 am Here's a quick shot that I took last night of the Double Cluster. Read back on the logs to see how much progress you have made through the months, the problems you overcame, and the notes taken to improve in the future. Individually, the clusters have a mass of 3,700 solar masses (NGC 869) and 2,800 solar masses (NGC 884), but as each cluster is surrounded by an extended halo of stars, the total mass of the Double Cluster is at least 20,000 solar masses. We imaged the Double Cluster in Perseus with 4 filters: As with most of our images, we like to show you the stacked image for each individual filter, sadly, these files are lost for this particular target. The Double Cluster in Perseus (NGC 869 and NGC 884) are two open clusters in the constellation Perseus. Bortle 6 skies, T-4, S-3. Thankfully, we did not plan to take exposures longer than 30 seconds anyway as this is what we usually do for star clusters. Image: Genuson at wikipedia.org. Each cluster contains 300 to 400 stars and the brightest stars shine at 7th magnitude. Processing wise I have not really done much just stretched it and a bit of noise reduction and that's it a nice easy one. This is also one of the easiest objects to image for beginner astrophotographers for the Winter months of November, December, January and February. The Double Cluster in Perseus is a beauty and fits perfectly in the 1.4° true field of view provided by my 32 mm plössl. Distance: 7,600 light years (2,300 parsecs) View. Image: ESO/S. Mass: 2,800 solar masses The clusters have a combined visual magnitude of 3.7 and 3.8 and are visible to the naked eye as a fuzzy patch between Perseus and Cassiopeia. Open clusters NGC 869 and NGC 884, however, are doubly impressive. Also known as "h and chi Persei", this unusual double cluster, shown above, is bright enough to be seen from a dark location without even binoculars. Description: Discover 60 Deep Sky Objects that will considerably improve your Imaging and Processing skills! NGC869 and NGC884 --- The Double Cluster August 15, 2002. Astronomers number its age to a few million years, i.e. English: The double cluster, in the constellation Perseus, is constituted of two open clusters: NGC 884 and NGC 869. Make sure to follow us on Facebook, Instagram, and YouTube to stay up to date with our work! The two star clusters making up the Double Cluster are called NGC 869 (h Persei) and NGC 884 (Chi Persei). The clusters are dominated by bright blue stars and, speckled with a few fine orange stars, make a spectacular sight in the night sky, especially through binoculars. Double Cluster NGC 869 and NGC 884. NGC 884 Part of the Double Cluster. Each cluster has approximately 300 stars. The Double Cluster (also known as Caldwell 14) consists of the open clusters NGC 869 and NGC 884 (often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus. Apparent size: 30′ Easy to spot in the northern winter sky between the constellations of Perseus and Cassiopeia, the Double Cluster is a favourite of amateur astronomers. For those used to a narrow field of view, click here. Probably, he used the name "h Persei" for a fainter nearby star. This book groups the constellations in a logical order, so that the reader can easily learn them by their origin, and see how their stories interact with one another as a group. The Double Cluster (Caldwell 14) is the common name for the naked-eye open clusters NGC884 and NGC869 (often designated Chi Persei and H Persei, respectively), which are close together in the constellation Perseus. NGC869 and NGC884 --- The Double Cluster August 15, 2002. Declination: +57°08′ Written By Jason Matter. Both NGC 869 and NGC 884 are getting closer to Earth at a rate of 24 miles per second. The Double Cluster, is NGC 884 and NGC 869, a group of two open star clusters in the Perseus constellation.It has many blue and red stars. The clusters NGC 869 and NNGC 884 feature dozens of bright, densly packed stars. But open clusters NGC 869 and NGC 884 are doubly impressive. The Double Cluster (also known as Caldwell 14) consists of 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 7,500 light years. With an apparent magnitude of 3.7/3.8, the Double Cluster is visible even without binoculars in good conditions, but best observed with binoculars or small telescopes. 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