The Herschel 400 catalogue is a subset of William Herschel's original Catalogue of Nebulae and Clusters of Stars , selected by Brenda F. Guzman (Branchett), Lydel Guzman, Paul Jones, James Morris, Peggy Taylor and Sara Saey of the Ancient City Astronomy Club in St. Augustine, Florida, United States c. 1980. They decided to generate the list after reading a letter [1] published in Sky & Telescope by James Mullaney of Pittsburgh, Pennsylvania, United States. [2]
In this letter Mr. Mullaney suggested that William Herschel's original catalogue of 2,500 objects would be an excellent basis for deep sky object selection for amateur astronomers looking for a challenge after completing the Messier Catalogue.
The Herschel 400 is a subset of John Herschel's General Catalogue of Nebulae and Clusters published in 1864 of 5,000 objects, and hence also of the New General Catalogue .
The catalogue forms the basis of the Astronomical League's Herschel 400 club. In 1997, another subset of 400 Herschel objects was selected by the Rose City Astronomers of Portland, Oregon as the Herschel II list, which forms the basis of the Astronomical League's Herschel II Program.
The Herschel 400 contains 17 objects that are part of the Messier catalogue:
Messier | NGC | Common name | Notes |
---|---|---|---|
M20 | NGC 6514 | Trifid Nebula | |
M33 | NGC 598 | Triangulum Galaxy | |
M47 | NGC 2422 | ||
M48 | NGC 2548 | ||
M51b | NGC 5195 | companion to the Whirlpool Galaxy | |
M61 | NGC 4303 | Swelling Spiral Galaxy | |
M76 | NGC 651 | Little Dumbbell Nebula, Barbell Nebula (northern portion) | |
M82 | NGC 3034 | Cigar Galaxy | |
M91 | NGC 4548 | ||
M102? | NGC 5866 | Spindle Galaxy | uncertain Messier object designation |
M104 | NGC 4594 | Sombrero Galaxy | |
M105 | NGC 3379 | ||
M106 | NGC 4258 | ||
M107 | NGC 6171 | Crucifix Cluster | |
M108 | NGC 3556 | Surfboard Galaxy | |
M109 | NGC 3992 | Vacuum Cleaner Galaxy | |
M110 | NGC 205 |
The Herschel 400 catalogue pre-dates the Caldwell catalogue by about 15 years. The Caldwell catalogue contains 44 objects that are members of the Herschel 400: [3]
Caldwell | NGC | Common name |
---|---|---|
C2 | NGC 40 | Bow-Tie Nebula |
C6 | NGC 6543 | Cat's Eye Nebula |
C7 | NGC 2403 | |
C8 | NGC 559 | |
C10 | NGC 663 | |
C12 | NGC 6946 | Fireworks Galaxy |
C13 | NGC 457 | Owl Cluster |
C14 | NGC 869 | Double Cluster |
C15 | NGC 6826 | Blinking Planetary |
C16 | NGC 7243 | |
C18 | NGC 185 | |
C20 | NGC 7000 | North America Nebula |
C21 | NGC 4449 | |
C22 | NGC 7662 | Blue Snowball |
C23 | NGC 891 | Silver Sliver Galaxy |
C25 | NGC 2419 | |
C28 | NGC 752 | |
C29 | NGC 5005 | |
C30 | NGC 7331 | |
C32 | NGC 4631 | Whale Galaxy |
C36 | NGC 4559 | |
C37 | NGC 6885 | |
C38 | NGC 4565 | Needle Galaxy |
C39 | NGC 2392 | Eskimo Nebula, Clown Face Nebula |
C40 | NGC 3626 | |
C42 | NGC 7006 | |
C43 | NGC 7814 | |
C44 | NGC 7479 | |
C45 | NGC 5248 | |
C47 | NGC 6934 | |
C48 | NGC 2775 | |
C50 | NGC 2244 | Satellite Cluster |
C52 | NGC 4697 | |
C53 | NGC 3115 | Spindle Galaxy |
C54 | NGC 2506 | |
C55 | NGC 7009 | Saturn Nebula |
C56 | NGC 246 | Skull Nebula |
C58 | NGC 2360 | Caroline's Cluster |
C59 | NGC 3242 | Ghost of Jupiter |
C60 | NGC 4038 | brighter of two Antennae Galaxies |
C62 | NGC 247 | |
C64 | NGC 2362 | Tau Canis Majoris Cluster |
C65 | NGC 253 | Sculptor Galaxy, Silver Coin Galaxy |
C66 | NGC 5694 |
Type of object | Number of objects |
---|---|
Galaxies | 231 |
Globular clusters | 34 |
Nebulae | 6 |
Star clusters | 99 |
Star clusters and nebulae | 5 |
Planetary nebulae | 24 |
Asterisms | 1 |
Total | 400 |
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Open cluster Globular cluster Diffuse nebula Planetary nebula Galaxy
Charles Messier was a French astronomer. He published an astronomical catalogue consisting of 110 nebulae and star clusters, which came to be known as the Messier objects, referred to with the letter M and their number between 1 and 110. Messier's purpose for the catalogue was to help astronomical observers distinguish between permanent and transient visually diffuse objects in the sky.
The Messier objects are a set of 110 astronomical objects catalogued by the French astronomer Charles Messier in his Catalogue des Nébuleuses et des Amas d'Étoiles. Because Messier was interested only in finding comets, he created a list of those non-comet objects that frustrated his hunt for them. This list, which Messier created in collaboration with his assistant Pierre Méchain, is now known as the Messier catalogue. The Messier catalogue is one of the most famous lists of astronomical objects, and many objects on the list are still referenced by their Messier numbers. The catalogue includes most of the astronomical deep-sky objects that can be easily observed from Earth's Northern Hemisphere; many Messier objects are popular targets for amateur astronomers.
The New General Catalogue of Nebulae and Clusters of Stars is an astronomical catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, including galaxies, star clusters and emission nebulae. Dreyer published two supplements to the NGC in 1895 and 1908, known as the Index Catalogues, describing a further 5,386 astronomical objects. Thousands of these objects are best known by their NGC or IC numbers, which remain in widespread use.
The Ring Nebula is a planetary nebula in the northern constellation of Lyra. Such a nebula is formed when a star, during the last stages of its evolution before becoming a white dwarf, expels a vast luminous envelope of ionized gas into the surrounding interstellar space.
Messier 100 is a grand design intermediate spiral galaxy in the southern part of the mildly northern Coma Berenices. It is one of the brightest and largest galaxies in the Virgo Cluster and is approximately 55 million light-years from our galaxy, its diameter being 107,000 light years, and being about 60% as large. It was discovered by Pierre Méchain in 1781 and 29 days later seen again and entered by Charles Messier in his catalogue "of nebulae and star clusters". It was one of the first spiral galaxies to be discovered, and was listed as one of fourteen spiral nebulae by Lord William Parsons of Rosse in 1850. NGC 4323 and NGC 4328 are satellite galaxies of M100; the former is connected with it by a bridge of luminous matter.
The North America Nebula is an emission nebula in the constellation Cygnus, close to Deneb. It is named because its shape resembles North America.
The Eskimo Nebula, also known as the Clown-faced Nebula, Lion Nebula, or Caldwell 39, is a bipolar double-shell planetary nebula (PN). It was discovered by astronomer William Herschel in 1787. The formation resembles a person's head surrounded by a parka hood. It is surrounded by gas that composed the outer layers of a Sun-like star. The visible inner filaments are ejected by a strong wind of particles from the central star. The outer disk contains unusual, light-year-long filaments.
Omega Centauri is a globular cluster in the constellation of Centaurus that was first identified as a non-stellar object by Edmond Halley in 1677. Located at a distance of 17,090 light-years, it is the largest-known globular cluster in the Milky Way at a diameter of roughly 150 light-years. It is estimated to contain approximately 10 million stars, and a total mass equivalent to 4 million solar masses, making it the most massive-known globular cluster in the Milky Way.
Messier 7 or M7, also designated NGC 6475 and sometimes known as the Ptolemy Cluster, is an open cluster of stars in the constellation of Scorpius. The cluster is easily detectable with the naked eye, close to the "stinger" of Scorpius. With a declination of −34.8°, it is the southernmost Messier object.
The Lagoon Nebula is a giant interstellar cloud in the constellation Sagittarius. It is classified as an emission nebula and as an H II region.
Messier 102 is a galaxy listed in the Messier Catalogue that cannot be unambiguously identified. Its original discoverer Pierre Méchain retracted his discovery two years after publication and said that it was a duplicate observation of Messier 101. Later historical evidence favors that M102 is actually the galaxy NGC 5866, although other galaxies have been suggested as possible identities. The National Aeronautics and Space Administration (NASA) considers it to be the same as NGC 5866.
The Small Sagittarius Star Cloud is a star cloud in the constellation of Sagittarius approximately 600 light years wide, which was catalogued by Charles Messier in 1764. It should not be confused with the nearby Large Sagittarius Star Cloud which lies about 10° to the south.
The Little Dumbbell Nebula, also known as Messier 76, NGC 650/651, the Barbell Nebula, or the Cork Nebula, is a planetary nebula in the northern constellation of Perseus. It was discovered by Pierre Méchain in 1780 and included in Charles Messier's catalog of comet-like objects as number 76. It was first classified as a planetary nebula in 1918 by the astronomer Heber Doust Curtis. However, others might have previously recognized it as a planetary nebula; for example, William Huggins found its spectrum indicated it was a nebula ; and Isaac Roberts in 1891 suggested that M76 might be similar to the Ring Nebula (M57), as seen instead from the side view.
Messier 91 is a barred spiral galaxy that is found in the south of Coma Berenices. It is in the local supercluster and is part of the Virgo Cluster of galaxies. It is about 63 million light-years away from our galaxy. It was the last of a group of eight "nebulae" – the term 'galaxy' only coming into use for these objects once it was realized in the 20th century that they were extragalactic – discovered by Charles Messier in 1781. It is the faintest object in the Messier catalog, with an apparent magnitude of 10.2.
The Owl Nebula is a planetary nebula approximately 2,030 light years away in the constellation Ursa Major. Estimated to be about 8,000 years old, it is approximately circular in cross-section with a faint internal structure. It was formed from the outflow of material from the stellar wind of the central star as it evolved along the asymptotic giant branch. The nebula is arranged in three concentric shells, with the outermost shell being about 20–30% larger than the inner shell. The owl-like appearance of the nebula is the result of an inner shell that is not circularly symmetric, but instead forms a barrel-like structure aligned at an angle of 45° to the line of sight.
Messier 110, or M110, also known as NGC 205, is a dwarf elliptical galaxy that is a satellite of the Andromeda Galaxy in the Local Group.
The Merope Nebula is a diffuse reflection nebula in the Pleiades star cluster, surrounding the 4th magnitude star Merope. It was discovered on October 19, 1859 by the German astronomer Wilhelm Tempel. The discovery was made using a 10.5cm refractor. John Herschel included it as 768 in his General Catalogue of Nebulae and Clusters of Stars but never observed it himself.
NGC 3532, also commonly known as the Pincushion Cluster, Football Cluster, the Black Arrow Cluster, or the Wishing Well Cluster, is an open cluster some 405 parsecs from Earth in the constellation Carina. Its population of approximately 150 stars of 7th magnitude or fainter includes seven red giants and seven white dwarfs. On 20 May 1990 it became the first target ever observed by the Hubble Space Telescope. A line from Beta Crucis through Delta Crucis passes somewhat to the north of NGC 3532. The cluster lies between the constellation Crux and the larger but fainter "False Cross" asterism. The 4th-magnitude Cepheid variable star x Carinae appears near the southeast fringes, but it lies between the Sun and the cluster and is not a member of the cluster.
The Caldwell catalogue is an astronomical catalogue of 109 star clusters, nebulae, and galaxies for observation by amateur astronomers. The list was compiled by Patrick Moore as a complement to the Messier catalogue.
NGC 4889 is an E4 supergiant elliptical galaxy. It was discovered in 1785 by the British astronomer Frederick William Herschel I, who catalogued it as a bright, nebulous patch. The brightest galaxy within the northern Coma Cluster, it is located at a median distance of 94 million parsecs from Earth. At the core of the galaxy is a supermassive black hole that heats the intracluster medium through the action of friction from infalling gases and dust. The gamma ray bursts from the galaxy extend out to several million light years of the cluster.
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