Which Greek astronomer first recorded the NGC 869 and 884 clusters?
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NGC 884 NGC 884 is an open cluster located 7600 light years away in the constellation of Perseus. It is the easternmost of the Double Cluster with NGC 869. NGC 869 and 884 are often designated h and χ Persei, respectively. The cluster is most likely around 12.5 million years old. Located in the Perseus OB1 association, both clusters are located physically close to one another, only a few hundred light years apart. The clusters were first recorded by Hipparchus, but have likely been known since antiquity.
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Hipparchus Hipparchus of Nicaea ( ; Greek: Ἵππαρχος, "Hipparkhos" ;  ) was a Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry but is most famous for his incidental discovery of precession of the equinoxes.
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NGC 448 NGC 448 is a lenticular galaxy of type S0^- (edge-on) located approximately 27.120 +/- away in the constellation Cetus. It was discovered on September 2, 1886 by Lewis Swift. It was described by Dreyer as "pretty bright, very small, [and] a little extended."
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NGC 267 NGC 267 is an open cluster in the Small Magellanic Cloud. It is located in the constellation Tucana. It was discovered on October 4, 1836 by John Herschel.
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NGC 129 NGC 129 is an open cluster in the constellation Cassiopeia. It was discovered by William Herschel in 1788. It is located almost exactly halfway between the bright stars Caph (β Cassiopeiae) and γ Cassiopeiae. It is large but not dense and can be observed by binoculars, where the most obvious is a small triangle of stars of magnitude 8 and 9, located in the center of the cluster.
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NGC 1502 NGC 1502 is a small open cluster of approximately 45 stars in the constellation Camelopardalis, it was discovered by William Herschel November 3, 1787. Kemble's Cascade seems to "flow" into NGC 1502.
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NGC 5986 NGC 5986 is a globular cluster in the constellation Lupus.
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NGC 418 NGC 418 is a barred spiral galaxy of type SB(s)c located in the constellation Sculptor. It was discovered on September 28, 1834 by John Herschel. It was described by Dreyer as "faint, pretty large, round, very gradually a little brighter middle, western of 2.", the other being NGC 423.
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Messier 37 Messier 37 (also known as "M37" or "NGC 2099") is the richest open cluster in the constellation Auriga. It is the brightest of three open clusters in Auriga and was discovered by the Italian astronomer Giovanni Battista Hodierna before 1654. M37 was missed by French astronomer Guillaume Le Gentil when he rediscovered M36 and M38 in 1749. French astronomer Charles Messier independently rediscovered M37 in September 1764 but all three clusters were recorded by Hodierna. It is classified as Trumpler type I,1,r or I,2,r.
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NGC 6801 NGC 6801 is a spiral galaxy in the constellation of Cygnus. It was discovered by Lewis A. Swift on August 5, 1886.
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NGC 6850 NGC 6850 is a spiral galaxy in the constellation Telescopium, discovered by John Herschel in 1836.
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NGC 38 NGC 38 (also known as MCG-1-1-47, Stephan XII, or PGC 818) is a spiral galaxy in the constellation Pisces. It was discovered in 1881.
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NGC 4689 NGC 4689 is a spiral galaxy located about 54 million light-years away in the constellation of Coma Berenices. NGC 4689 is inclined at an angle of about 36° which means that the galaxy is seen almost face-on to the Earth's line of sight. NGC 4689 was discovered by astronomer William Herschel on April 12, 1784. The galaxy is a member of the Virgo Cluster.
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NGC 2240 NGC 2240 is an open cluster in the constellation Auriga. It was discovered by William Herschel on January 3, 1786, and is located about 5.1 thousand light-years away.
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NGC 176 NGC 176 is an open cluster located around 3.5 million light-years in the constellation Tucana. This cluster consists of several stars together with another galaxy making it one of the most fascinating galaxies among nearby galaxies. It was discovered on August 12, 1834 by John Herschel.
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NGC 6861 NGC 6861 is a lenticular galaxy located in the Telescopium constellation. It is the second-brightest object in the constellation. Unlike most lenticular galaxies, which tend to be mostly devoid of both gas and dust, NGC 6861 exhibits a thick obscuring ring of dust around the nucleus where star formation is occurring. The galaxy was discovered by Scottish astronomer James Dunlop, in 1826. NGC 6861 is interacting with NGC 6868, and it is predicted that they will eventually merge.
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NGC 604 NGC 604 is an H II region inside the Triangulum Galaxy. It was discovered by William Herschel on September 11, 1784. It is the largest H II region in the Local Group of galaxies; at the galaxy's estimated distance of 2.7 million light-years, its longest diameter is roughly 1,520 light years (~460 parsecs), over 40 times the size of the visible portion of the Orion Nebula. It is over 6,300 times more luminous than the Orion Nebula, and if it were at the same distance it would outshine Venus. Its gas is ionized by a cluster of massive stars at its center. with 200 stars of spectral type O and WR, a mass of 10 solar masses, and an age of 3.5 million years; however, unlike the Large Magellanic Cloud's Tarantula Nebula central cluster (R136), NGC 604's one is much less compact and more similar to a large stellar association, being considered the prototypical example of a "Scaled OB Association" ("SOBA")
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NGC 408 NGC 408 is a star located in the constellation Pisces. It was discovered on October 22, 1867 by Herman Schultz. It was described by Dreyer as "very faint, very small, (WH) II 220 eight seconds of time to east.", WH II 220 being NGC 410.
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NGC 317 NGC 317 is a pair of interacting galaxies, consisting of a lenticular galaxy and a spiral galaxy, in the constellation Andromeda. It was discovered on October 1, 1885 by Lewis Swift.
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Eudoxus of Cnidus Eudoxus of Cnidus ( ; Greek: Εὔδοξος ὁ Κνίδιος , "Eúdoxos ho Knídios"; c. 390– c. 337 BC) was a Greek astronomer, mathematician, scholar and student of Plato. All of his works are lost, though some fragments are preserved in Hipparchus' commentary on Aratus's poem on astronomy. Theodosius of Bithynia's important work, "Sphaerics", may be based on a work of Eudoxus.
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NGC 336 NGC 336 is a spiral galaxy in the constellation Cetus. It was discovered on October 31, 1885 by Francis Leavenworth. It was described by Dreyer as "very faint, small, round, suddenly brighter middle." It is also known as PGC 3470. Despite this, sometimes it is mistakenly identified as PGC 3526.
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Callippus Callippus ( ; Ancient Greek: Κάλλιππος ; c. 370 BC – c. 300 BC) was a Greek astronomer and mathematician.