NGC 1808 is a Seyfert galaxy located in the constellation Columba, The which astronomical event that occurs during the last stellar evolutionary stages of a massive star's life, whose dramatic and catastrophic destruction is marked by one final titanic explosion, 1993af appeared in NGC 1808?
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NGC 1808 NGC 1808 is a Seyfert galaxy located in the constellation Columba. The Supernova 1993af appeared in NGC 1808.
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Supernova A supernova plural: supernovae or supernovas, abbreviations: SN and SNe) is an astronomical event that occurs during the last stellar evolutionary stages of a massive star's life, whose dramatic and catastrophic destruction is marked by one final titanic explosion. This causes the sudden appearance of a "new" bright star, before slowly fading from sight over several weeks or months.
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CXOU J061705.3+222127 CXOU J061705.3+222127 is a neutron star. It was likely formed 30,000 years ago in the supernova that created the supernova remnant IC 443, the "Jellyfish Nebula". It is travelling at approximately 800,000 km/h away from the site.
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NGC 4178 NGC 4178 is the "New General Catalogue" identifier for a barred spiral galaxy in the equatorial constellation of Virgo. It was discovered April 11, 1825 by English astronomer John Herschel. Located some 43.8 million light years away, this galaxy spans 2.3 × 0.4 arc minutes and is seen at a low angle, being inclined by 77° to the line of sight from the Earth. The morphological classification of NGC 4178 is SB(rs)dm, indicating that it has a bar feature at the core, and, per the '(rs)', has traces of a ring-like structure surrounding the bar. The 'dm' suffix indicates the spiral arms are diffuse, broken, and irregular in appearance with no bulge at the nucleus. This galaxy is a member of the Virgo Cluster, which is the richest nearby group of galaxies outside the Local Group and forms the core of the Virgo Supercluster.
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SN 1961i SN 1961i was a supernova that was discovered in June 1961 in the Messier 61 (NGC 4303) galaxy, by Milton L. Humason at the Palomar Observatory, the brightest of 16 supernovae found at Palomar that year. Although it was originally consider by Fritz Zwicky to be the prototype of a type III supernova, subsequent researchers have classified it as a type II supernova.
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Beethoven Burst (GRB 991216) GRB 991216, nicknamed the Beethoven Burst by Dr. Brad Schaefer of Yale University, was a gamma-ray burst observed on December 16, 1999, coinciding with the 229th anniversary of Ludwig van Beethoven's birth. A gamma-ray burst is a highly luminous flash associated with an explosion in a distant galaxy and producing gamma rays, the most energetic form of electromagnetic radiation, and often followed by a longer-lived "afterglow" emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, and radio).
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NGC 166 NGC 166 (also known as PGC 2143) is a spiral galaxy located around 2.6 million light-years away in the constellation Cetus, with an apparent magnitude of 15.18. It was discovered by Francis Preserved Leavenworth in 1886.
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Superbubble A superbubble or supershell is a cavity which is hundreds of light years across, and is filled with 10 K gas blown into the interstellar medium by multiple supernovae and stellar winds. The winds of newly born stars strip superbubbles of any dust or gas. The Solar System lies near the center of an old superbubble, known as the Local Bubble, whose boundaries can be traced by a sudden rise in dust extinction of stars at distances greater than a few hundred light years.
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NGC 1851 NGC 1851 (also known as Caldwell 73) is a globular cluster located in the constellation Columba.
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Alpha Lupi Alpha Lupi (α Lupi, α Lup) is the brightest star in the southern constellation of Lupus. According to the Bortle Dark-Sky Scale, its apparent visual magnitude of 2.3 makes it readily visible to the naked eye even from highly light-polluted locales. Based upon parallax measurements made during the Hipparcos mission, the star is located at a distance of around 460 ly from Earth. It is one of the nearest supernova explosion candidates.
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Hypergiant A hypergiant (luminosity class 0 or Ia) is among the very rare kinds of stars that typically show tremendous luminosities and very high rates of mass loss by stellar winds. The term "hypergiant" is defined as luminosity class 0 (zero) in the MKK system. However, this is rarely seen in the literature or in published spectral classifications, except for specific well-defined groups such as the yellow hypergiants, RSG (red supergiants), or blue B(e) supergiants with emission spectra. More commonly, hypergiants may be classed as Ia-0 or Ia, but red supergiants rarely receive these extra spectral classifications. Astronomers are mostly interested in these stars because they relate to understanding stellar evolution, especially with star formation, stability, and their expected demise as supernovae.
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NGC 2818 NGC 2818 is a planetary nebula located in the southern constellation Pyxis (The Compass). It consists largely of glowing gases from the star's outer layers ejected during the final stages of its life when it had run out of the fuel necessary to sustain its core fusion processes. The remnants of its core will remain as a white dwarf.
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NGC 1491 NGC 1491 is a bright nebula in the constellation of Perseus. It is also known as LBN 704.
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PGC 214560 PGC 214560 is a galaxy in the Hercules constellation. It is currently interacting with the galaxy SDSS J170007.01+230739.1. PGC 214560 has a similar appearance to the Mice Galaxies and is home to supernovae 2008eq, CBET 1460.
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NGC 185 NGC 185 (also known as Caldwell 18) is a dwarf spheroidal galaxy located 2.08 million light-years from Earth, appearing in the constellation Cassiopeia. It is a member of the Local Group, and is a satellite of the Andromeda Galaxy (M31). NGC 185 was discovered by William Herschel on November 30, 1787, and he cataloged it "H II.707". John Herschel observed the object again in 1833 when he cataloged it as "h 35", and then in 1864 when he cataloged it as "GC 90" within his "General Catalogue of Nebulae and Clusters". NGC 185 was first photographed between 1898 and 1900 by James Edward Keeler with the Crossley Reflector of Lick Observatory. Unlike most dwarf elliptical galaxies, NGC 185 contains young stellar clusters, and star formation proceeded at a low rate until the recent past. NGC 185 has an active galactic nucleus (AGN) and is usually classified as a type 2 Seyfert galaxy, though its status as a Seyfert is questioned. It is possibly the closest Seyfert galaxy to Earth, and is the only known Seyfert in the Local Group.
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NGC 6326 NGC 6326 is a complex and irregularly structured planetary nebula located in the constellation Ara. It is designated as PN in the galaxy morphological classification scheme and was discovered by the Scottish astronomer James Dunlop on 26 August 1826. NGC 6326 is the result of the ejected material from the central binary star, which is nearing the end of its life. The blue and red color is due to the amount of radiation the star releases, thus causing the gasses to glow. NGC 6326 is located at about 11,000 light years away from earth.<ref name="NASA/IPAC"> </ref>
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NGC 2768 NGC 2768 is a lenticular galaxy located in the constellation of Ursa Major. It is at a distance of 65 million light years from Earth. NGC 2768 is an example of a Seyfert galaxy, an object with a supermassive black hole at its centre. A dusty structure is encircling the centre of the galaxy, forming a knotted ring around the galaxy’s brightly glowing middle. This ring lies perpendicular to the plane of NGC 2768 itself, stretching up and out of the galaxy. The dust in NGC 2768 forms an intricate network of knots and filaments.
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Planetary nebula A planetary nebula, often abbreviated as PN or plural PNe, is a kind of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from old red giant stars late in their lives. The word "nebula" is Latin for mist or cloud, and the term "planetary nebula" is a misnomer that originated in the 1780s with astronomer William Herschel because when viewed through his telescope, these objects resemble the rounded shapes of planets. Herschel's name for these objects was popularly adopted and has not been changed. They are a relatively short-lived phenomenon, lasting a few tens of thousands of years, compared to a typical stellar lifetime of several billion years.
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SN 2002bj SN 2002bj was the explosion of a star in the galaxy NGC 1821, located in the constellation
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T Tauri wind The T Tauri wind — so named because of the young star currently in this stage—is a phenomenon indicative of the phase of stellar development between the accretion of material from the slowing rotating material of a solar nebula and the ignition of the hydrogen that has agglomerated into the protostar.
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NGC 6822 NGC 6822 (also known as Barnard's Galaxy, IC 4895, or Caldwell 57) is a barred irregular galaxy approximately 1.6 million light-years away in the constellation Sagittarius. Part of the Local Group of galaxies, it was discovered by E. E. Barnard in 1884 (hence its name), with a six-inch refractor telescope. It is one of the closer galaxies to the Milky Way. It is similar in structure and composition to the Small Magellanic Cloud. It is about 7,000 light-years in diameter.
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SN 2007sr SN 2007sr was a Type Ia supernova event that happened in the galaxy NGC 4038. It was announced on December 18, 2007, but was visible on images beginning December 7. It peaked at magnitude 12.7 on December 14.