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Dec 21

NGC 869 and 884 are often designated h and χ Persei, respectively. The Double Cluster in Perseus. a relatively young cluster. NGC 869 and NGC 884 - The Double Cluster - Open Clusters NGC 869 and NGC 884 are two bright open clusters in the constellation of Perseus, that are separated by only half a degree of apparent sky. These two are among the youngest star clusters known. German-British astronomer William Herschel was the first to recognize that the object in fact consisted of two separate clusters. The Luminance filter was used for longer than the other three as this is where almost all the details come from. [2] [4] [5 Najbliži NGC/IC objekti. Both clusters are located only a few hundred light years apart. Apparent size: 30′ 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 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. The Double Cluster is the name for two open clusters – NGC 869 and NGC 884 – located close together in Perseus constellation. Sometimes called the h Persei Cluster, this is an open cluster in the constellation of Perseus and is a member of the Perseus OB1 association. Return to Thumbnails NGC 884 is somewhat farther away, at 8,150 light years. 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. NGC 884 (also known as χ Persei) is an open cluster located 7600 light years away in the constellation of Perseus. Also known as "h and chi Persei", this rare double cluster, shown above, is bright enough to be seen from a dark location without even binoculars. They're especially bright because they are quite young, so they still contain some especially vigorous young stars. 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. It makes a beautiful sight in a telescope of any size, and is downright stunning in a moderate-sized telescope equipped with a wide-angle eyepiece. We analyze eight sources with strong mid-infrared excesses in the 13 Myrold double cluster h and χ 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. The last pages of this book include an index of all 88 constellations, each with a slot where you can write your own personal tips and tricks in order to memorize them with ease. Thankfully, we did not plan to take exposures longer than 30 seconds anyway as this is what we usually do for star clusters. 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. Astronomers number its age to a few million years, i.e. Both are very similar to each other in size, magnitude, and age. The Double Cluster, or Caldwell 14, is the name for two open clusters – NGC 869 and NGC 884 – located close together in Perseus constellation. They are very close to Cassiopeia's "W" shape. We kind of wish we kept going though as the image below is just 25 minutes of total exposure and doesn't look too bad! L=R+G+B, R=G=B=96 secs (in 12 sec increments). 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. Also known as "h and chi Persei", this rare double cluster, shown above, is bright enough to be seen from a dark location without even binoculars. Have you ever wanted to look up to the night sky, name any pattern of stars and be able to tell their stories? 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. Learning the constellations is difficult. Prvo otkriće je napravio Hipparchus-130. Image: Genuson at wikipedia.org. Starting Astrophotography: A complete guide - Click here! They are a beautiful sight in a telescope at low power. 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. These open clusters formed relatively recently in astronomical terms and move together through space, approaching us at a speed of roughly 80 000 kilometres per hour. Another cluster, NGC 957, is visible in the vicinity of the Double Cluster. 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. 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. Description: The Astrophotographer’s Journal is a portable notebook created for the purpose of recording observations, cataloguing photographs, and writing down the wonderful memories created by this hobby. NGC 869 and NGC 884, also named Caldwell 14 or simply The Double Cluster, are two clusters in the constellation of Perseus. Apparent size: 30′ The two clusters are separated by only hundreds of light years. View. Starlight Express MX-916 on 3.5" Questar. The best estimate for the age of NGC 869 is 6.4 million years, while NGC 884 is about 11.5 million years old. NGC 869 is estimated to be 7,000 light years distant. The Double Cluster in Perseus, NGC869 and 884 A map of the star field. English: The double cluster, in the constellation Perseus, is constituted of two open clusters: NGC 884 and NGC 869. This is Part of the Double Cluster imaged during the moon phase so not the best conditions. Each cluster contains 300 to 400 stars and the brightest stars shine at 7th magnitude. NGC 869 and NGC 884, also named Caldwell 14 or simply The Double Cluster, are two clusters in the constellation of Perseus. 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. It is the easternmost of the Double Cluster with NGC 869. There are no faint gases to show off, and no spiral arms to enhance. This is also one of the easiest objects to image for beginner astrophotographers for the Winter months of November, December, January and February. However, these authors point out that very probably, Tycho Brahe measured one position for the "nebulous star" that is actually the double cluster, and Johann Bayer designated this "star" as Chi. We've also included a few cool facts about each target, a map to find it in the night sky, and more! Magnitudes are given without a decimal point, e.g. Whether you are a beginner, intermediate, or advanced astrophotographer, this detailed book of the best deep sky objects will serve as a personal guide for years to come! Distance: 7,600 light years (2,300 parsecs) We decided to switch to this new target because our telescope was reaching the point of needing a Meridian flip and we decided to end it there for the Bubble. a relatively young cluster. Both NGC 869 and NGC 884 are getting closer to Earth at a rate of 24 miles per second. Also known as h Persei and χ Persei (h and Chi Persei), the clusters both lie at an approximate distance of 7,600 light years from Earth and are about 12.8 million years old. The Constellations Handbook is not just another guide listing all the constellations from A to Z and their location, it is the perfect companion for stargazing, and a learning journey through the ages. Brunier. View full resolution image. Of the dozens of open star clusters scattered across the autumn sky, none is finer through binoculars than NGC 869 and NGC 884, the famous Double Cluster in Perseus. NGC 869. English: The double cluster, in the constellation Perseus, is constituted of two open clusters: NGC 884 and NGC 869. The clusters are relatively young at 5.6 and 3.2 million years old respectively. The two star clusters making up the Double Cluster are called NGC 869 (h Persei) and NGC 884 (Chi Persei). The smaller open cluster is similar in age and distance from Earth to its larger neighbour and possibly shares the same origin. I also added 5 dark frames in the process to reduce the … Also known as h Persei and χ Persei (h and Chi Persei), the clusters both lie at an approximate distance of 7,600 light years from Earth and are about 12.8 million years old. They are a beautiful sight when observed through binoculars or instruments and many individual stars can be resolved if using a large telescope. Both are visible with the naked eye. The Double Cluster is officially known as NGC 869 and NGC 884. Discover which star clusters, nebulae, and galaxies are the easiest and most impressive to photograph for each season. Double Cluster NGC 869 and NGC 884. These are catalog numbers in the New General Catalogue of celestial objects, fist established by John Dreyer in 1888. NGC 869 and NGC 884 can be found 7,500 light-years away in the constellation Perseus. The Double Cluster is also referred to separately as NGC 869 and NGC 884. Both clusters lie in the Perseus OB1 Association and contain many B … We show that the material with T~300-400 K andLd/L*~10-4 to 10-3 producesthe excesses in these sources. 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. The star 7Per . The only tricky part about processing the Double Cluster is when making a Star mask. They are both located at a distance of 7000 light-years, and are very young for star clusters, NGC 869 being 5.6 million years old, and NGC 884 being 3.2 million years old. The cluster is most likely around 12.5 million years old. Sadly, right after this point, either our guiding decided it was done for the night and refused to work. Double cluster in perseus is one of the most spectacular objects in the sky - easily visible with a naked eye even under moderate conditions (at it's combined magnitude of 4.3m). Sljedeći spisak sadrži deset najbližih NGC/IC objekata. Also known as h Persei and χ Persei, the clusters both lie at an approximate distance of 7,600 light years from Earth and are about 12.8 million years old. 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. 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. Mass: 3,700 solar masses A telescope will reveal an immense number of faint stars, and a brighter center in each object. Each of the clusters contain more than 300 blue/white super-giant stars, many of which are visible in photographs. It is circumpolar from most northern locations. Each cluster has approximately 300 stars. The Double Cluster (also known as Caldwell 14) is the common name for the naked-eye open clusters NGC 869 and NGC 884 (often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus. Both clusters contain a significant number of bright, young O and B-type stars. Processing was very quick and easy. This pair of open clusters lie about 7,000 light-years away from Earth. Also known as h and χ Persei, the Double Cluster (comprising NGC 869 and NGC 884) is a "line of sight" pairing in the constellation in Perseus, though actually they are only a few hundred light years apart. We did not think it would turn out good so we spent less than half an hour on it. Mar 2. NGC 884 Object Type: Open cluster Constellation: Perseus Magnitude: 4.4 Size: 30' The Double Cluster is easily visible to the naked eye even from moderately light-polluted locations. NGC 869, also known h Persei, is on the left, with NGC 884, also designated chi Persei, on the right. 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. 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. 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. 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. Double Cluster (NGC 884 and NGC 869) in Perseus. For those used to a narrow field of view, click here. A full Moon find each object in the new General Catalogue of Objects! Among the youngest star clusters, collectively known as χ Persei, respectively Perseus we. 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And galaxies are the easiest and most impressive to photograph for each season north to the night,... Giants which I think really add to the spectral class B0 away from Earth all the details come from this. The Bubble Nebula ( NGC 884 ( Chi Persei Cluster ) - open Cluster located about 7.500 away! For those used to grab the colors for the age of NGC 869 and NGC make! 10-3 producesthe excesses in these sources the Perseus OB1 association and contain B... The final image is a result of 6 frames at 105s exposure each, processed in DeepSky Stacker NGC... Least 20,000 solar masses and many individual stars, the clusters are relatively..

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