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Pinwheel Galaxy

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Pinwheel Galaxy
Observation data (J2000 epoch)
ConstellationUrsa Major
Richt ascension14h 03m 12.6s
Declination+54° 20′ 57″
Helio radial velocity241 ± 2 km/s
Distance20.9 ± 1.8 Mly (6.4 ± 0.5 Mpc)
Size (ly)~170,000 ly in diameter[1]
Nummer o starns1 trillion (1012)
Apparent dimensions (V)28′.8 × 26′.9
Apparent magnitude (V)7.86
Ither designations
Messier 101, M101, NGC 5457, UGC 8981, PGC 50063, Arp 26
References: [2][3][4][5][6][7]
See an aa: Galaxy, Leet o galaxies

The Pinwheel Galaxy (kent as Messier 101, M101 or NGC 5457 an aw) is a face-on spiral galaxy distanced 21 million licht-years (sax megaparsecs)[3] away in the constellation Ursa Major, first discovered bi Pierre Méchain on Mairch 27, 1781, an communicatit tae Charles Messier wha verified its poseetion for inclusion in the Messier Catalogue as ane o its final entries.

References[eedit | eedit soorce]

  1. http://www.nasa.gov/multimedia/imagegallery/image_feature_2265.html#.VIX5BWf0DDE NASA/CXC/SAO; IR & UV: NASA/JPL-Caltech; Optical: NASA/STScI
  2. "NASA/IPAC Extragalactic Database". Results for Messier 101. Retrieved 6 December 2006.
  3. a b Shappee, Benjamin; Stanek, Kris (Juin 2011). "A New Cepheid Distance to the Giant Spiral M101 Based on Image Subtraction of Hubble Space Telescope/Advanced Camera for Surveys Observations". Astrophysical Journal. 733 (2): 124. arXiv:1012.3747. Bibcode:2011ApJ...733..124S. doi:10.1088/0004-637X/733/2/124.
  4. R. W. Sinnott, ed. (1988). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation / Cambridge University Press. ISBN 0-933346-51-4.
  5. "Distance Results for Messier 101". NASA/IPAC Extragalactic Database. Retrieved 1 Mey 2010.
  6. "SIMBAD-M101". SIMBAD Astronomical Database. Retrieved 29 November 2009.
  7. Armando, Gil de Paz; Boissier; Madore; Seibert; et al. (2007). "The GALEX Ultraviolet Atlas of Nearby Galaxies". Astrophysical Journal Supplement. 173 (2): 185–255. arXiv:astro-ph/0606440. Bibcode:2007ApJS..173..185G. doi:10.1086/516636. Explicit use of et al. in: |author6= (help)

Coordinates: Sky map 14h 03m 12.6s, +54° 20′ 57″