Messier 15

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Messier 15
New Hubble image of star cluster Messier 15.jpg
M15 photographed bi HST. The planetar nebula Pease 1 can be seen as a smaw blue object tae the upper left o the core o the cluster.
Observation data (J2000 epoch)
Cless IV[1]
Constellation Pegasus
Richt ascension 21h 29m 58.33s[2]
Declination +12° 10′ 01.2″[2]
Distance 33 kly (10 kpc)[3]
Apparent magnitude (V) +6.2
Apparent dimensions (V) 18′.0
Pheesical chairacteristics
Mass 5.6×105[4] M
Radius ~88 ly[5]
VHB 15.83
Metallicity  = –2.37[6] dex
Estimatit age 12.0 Gyr[7]
Notable featurs steep central cusp
Ither designations NGC 7078, GCl 120[8]
See an aw: Globular cluster, Leet o globular clusters

Messier 15 or M15 (an aw designatit NGC 7078) is a globular cluster in the constellation Pegasus.

References[eedit | eedit soorce]

  1. Shapley, Harlow; Sawyer, Helen B. (August 1927). "A Classification of Globular Clusters". Harvard College Observatory Bulletin. 849 (849): 11–14. Bibcode:1927BHarO.849...11S. 
  2. 2.0 2.1 Goldsbury, Ryan; et al. (December 2010). "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters". The Astronomical Journal. 140 (6): 1830–1837. arXiv:1008.2755Freely accessible. Bibcode:2010AJ....140.1830G. doi:10.1088/0004-6256/140/6/1830. 
  3. Hessels, J. W. T.; et al. (November 2007). "A 1.4 GHz Arecibo Survey for Pulsars in Globular Clusters". The Astrophysical Journal. 670 (1): 363–378. arXiv:0707.1602Freely accessible. Bibcode:2007ApJ...670..363H. doi:10.1086/521780. 
  4. Marks, Michael; Kroupa, Pavel (August 2010). "Initial conditions for globular clusters and assembly of the old globular cluster population of the Milky Way". Monthly Notices of the Royal Astronomical Society. 406 (3): 2000–2012. arXiv:1004.2255Freely accessible. Bibcode:2010MNRAS.406.2000M. doi:10.1111/j.1365-2966.2010.16813.x.  Mass is from MPD on Table 1.
  5. distance × sin( diameter_angle / 2 ) = 88 ly radius
  6. Boyles, J.; et al. (November 2011). "Young Radio Pulsars in Galactic Globular Clusters". The Astrophysical Journal. 742 (1): 51. arXiv:1108.4402Freely accessible. Bibcode:2011ApJ...742...51B. doi:10.1088/0004-637X/742/1/51. 
  7. Koleva, M.; et al. (April 2008). "Spectroscopic ages and metallicities of stellar populations: validation of full spectrum fitting". Monthly Notices of the Royal Astronomical Society. 385 (4): 1998–2010. arXiv:0801.0871Freely accessible. Bibcode:2008MNRAS.385.1998K. doi:10.1111/j.1365-2966.2008.12908.x 
  8. "M 15". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2006-11-16. 

Coordinates: Sky map 21h 29m 58.38s, 12° 10′ 00.6″