Messier 81

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Messier 81[1][2]
Messier 81 HST.jpg
A Hubble Space Telescope (HST) image
o Messier 81
Observation data
Epoch J2000
Constellation Ursa Major[3]
Richt ascension 09h 55m 33.2s[4]
Declination +69° 3′ 55″[4]
Apparent dimension (V) 26.9 × 14.1 moa[4]
Apparent magnitude (V)6.94[5][6]
TypeSA(s)ab,[4] LINER[4]
Helio Radial velocity -34 ± 4[4]km/s
Reidshift -0.000113 ± 0.000013[4]
Galactocentric Velocity 73 ± 6[4] km/s
Distance 11.8 ± 0.4 Mly (3.62 ± 0.12 Mpc)
Other designations
NGC 3031,[4] UGC 5318,[4] PGC 28630,[4] Bode's Galaxy[7]

Messier 81 (an aa kent as NGC 3031 or Bode's Galaxy) is a spiral galaxy aboot 12 million licht-years away in the constellation Ursa Major. Due tae its proximity tae Yird, lairge size an active galactic nucleus (which harbors a 70 million M[8] supermassive black hole), Messier 81 haes been studied extensively bi professional astronomers. The galaxy's lairge size an relatively heicj brightness an aa mak it a popular target for amateur astronomers.[9]

References[eedit | eedit soorce]

  1. Jensen, Joseph B.; Tonry, John L.; Barris, Brian J.; Thompson, Rodger I.; Liu, Michael C.; Rieke, Marcia J.; Ajhar, Edward A.; Blakeslee, John P. (2003). "Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations". Astrophysical Journal. 583 (2): 712–726. arXiv:astro-ph/0210129. Bibcode:2003ApJ...583..712J. doi:10.1086/345430.CS1 maint: multiple names: authors leet (link)
  2. I. D. Karachentsev, O. G. Kashibadze (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics. 49 (1): 3–18. Bibcode:2006Ap.....49....3K. doi:10.1007/s10511-006-0002-6.
  3. 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.
  4. a b c d e f g h i j k "NASA/IPAC Extragalactic Database". Results for NGC 3031. Retrieved 10 November 2006.
  5. "SIMBAD-M81". SIMBAD Astronomical Database. Retrieved 28 November 2009.
  6. Armando, Gil de Paz; Boissier; Madore; Seibert; Boselli; et al. (2007). "The GALEX Ultraviolet Atlas of Nearby Galaxies". Astrophysical Journal. 173 (2): 185–255. arXiv:astro-ph/0606440. Bibcode:2007ApJS..173..185G. doi:10.1086/516636.
  7. "SIMBAD Astronomical Database". Results for NGC 3031. Retrieved 10 November 2006.
  8. N. Devereux, H. Ford, Z. Tsvetanov, and J. Jocoby (2003). "STIS Spectroscopy of the Central 10 Parsecs of M81: Evidence for a Massive Black Hole". Astronomical Journal. 125 (3): 1226–1235. Bibcode:2003AJ....125.1226D. doi:10.1086/367595.CS1 maint: multiple names: authors leet (link)
  9. S. J. O'Meara (1998). The Messier Objects. Cambridge University Press. ISBN 0-521-55332-6.