NGC 3198, also known as Herschel 146[4] is a barred spiral galaxy in the constellation Ursa Major. It was discovered by William Parsons, 3rd Earl of Rosse (Lord Rosse), sometime before 1850.[2] NGC 3198 is located in the Leo Spur,[2] which is part of the Virgo Supercluster,[5] and is approximately 47 million light years away.[2]
NGC 3198 was one of 18 galaxies targeted by the Hubble Space Telescope (HST) Key Project on the Extragalactic Distance Scale, which aimed to calibrate various secondary distance indicators and determine the Hubble constant to an accuracy of 10%. The type and orientation of NGC 3198 made it suitable for these measurements.[6] The Wide Field and Planetary Camera 2 (WFPC2) of the HST was used to measure the magnitudes of 52 Cepheid variables, and the resulting distance modulus corresponded to a distance of 14.5 Mpc (47 million light years).[6]
Observations made with the Westerbork Synthesis Radio Telescope detected for the first time the presence of extraplanar gas.[7] The extraplanar gas makes up approximately 15% of the total atomic hydrogen (HI) mass of the galaxy.[7]
Two supernovae have been discovered in NGC 3198: SN 1966J, a Type Ib supernova,[2] and 1999bw, which was significantly fainter than expected when first discovered, and has been classified a Type IIn supernova.[8]
^ abcd"NGC 3198". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 5 July 2015.
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O'Meara, Stephen James (2011). Deep-Sky Companions: The Secret Deep, Volume 4. Photographs by Mario Motta. Cambridge University Press. pp. 186–188. ISBN 978-1-139-50007-4.
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Bratton, Mark (2011). The Complete Guide to the Herschel Objects. Cambridge University Press. p. 440. ISBN 978-0-521-76892-4.
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Clark, Maurice. "Herschel 146 / NGC 3198". Herschel 400 List Objects. Retrieved 2017-01-25.
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Monks, Neale (2010). Go-To Telescopes Under Suburban Skies. Springer. p. 53. ISBN 978-1-4419-6851-7.
^ ab
Kelson, Daniel (1999). "The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XIX. The Discovery of Cepheids in and a New Distance to NGC 3198". The Astrophysical Journal. 514 (2): 614–636. Bibcode:1999ApJ...514..614K. doi:10.1086/306989.
^ ab
Gentile, G. (2013). "HALOGAS: Extraplanar gas in NGC 3198". Astronomy & Astrophysics. 554: A125. arXiv:1304.4232. Bibcode:2013A&A...554A.125G. doi:10.1051/0004-6361/201321116. S2CID 56047203.
^
Bishop, David. "Supernova 1999bw in NGC 3198". Astronomy Section Rochester Academy of Science. Retrieved 25 January 2017.
NGC3198, also known as Herschel 146 is a barred spiral galaxy in the constellation Ursa Major. It was discovered by William Parsons, 3rd Earl of Rosse...
lacks a galactic bulge. NGC 3319 is relatively isolated. It is in a small group of galaxies including NGC 3104, NGC 3184, and NGC3198. The nearest galaxy...
proposed, showing that the rotation curves for the Milky Way, NGC 3031, NGC3198 and NGC 7331 are consistent with the mass density distributions of the...
which have shown evidence of extraplanar gas include NGC 891, NGC 2403, UGC 7321, NGC 4559 and NGC3198. Possible explanations for the presence of this gas...
identified it as a symbiotic star in 1972. Wild's Supernova is SN 1966j in NGC3198 (in Ursa Major). Named after Paul Wild. Wischnjewsky's Supernova in Fornax...
II Program. The catalogue contains 400 objects. All objects are from the NGC. All objects are visible in mid northern latitudes, since they were all observed...
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It is a member of the NGC 2998 group, which also includes NGC 2998, NGC 3002, NGC 3006, NGC 3008, and a few others. Skrutskie, Michael F.; Cutri, Roc...
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light-years from the Sun. It is a member of the NGC 2998 group, which also includes NGC 2998, NGC 3002, NGC 3005, NGC 3006, and a few others. Among these galaxies...
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at an effective temperature of 4,416 K. The spiral galaxy in Ursa Major, NGC 3877 (= H I.201), type Sc, is best found from Chi Ursae Majoris, which is...
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