Pinwheel Galaxy

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Pinwheel Galaxy
M101 hires STScI-PRC2006-10a.jpg
Observation data (J2000 epoch)
Constellation Ursa Major
Richt ascension 14h 03m 12.6s
Declination +54° 20′ 57″
Redshift 0.000804
Helio radial velocity 241 ± 2 km/s
Distance 20.9 ± 1.8 Mly (6.4 ± 0.5 Mpc)
Teep SAB(rs)cd
Size (ly) ~170,000 ly in diameter[1]
Nummer o starns 1 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 (an aa kent as Messier 101, M101 or NGC 5457) 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 2006-12-06. 
  3. 3.0 3.1 Shappee, Benjamin; Stanek, Kris (June 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:1012.3747Freely accessible. 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 2010-05-01. 
  6. "SIMBAD-M101". SIMBAD Astronomical Database. Retrieved 2009-11-29. 
  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/0606440Freely accessible. Bibcode:2007ApJS..173..185G. doi:10.1086/516636. 

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