Sh2-186

Sh2-186
Regione H II
Sh2-186
Dati osservativi
(epoca J2000)
CostellazioneCassiopea
Ascensione retta01h 08m 51s[1]
Declinazione+63° 07′ 34″[1]
Coordinate galattichel = 124,9; b = +00,3[1]
Distanza8480[2] a.l.
(2600[2] pc)
Magnitudine apparente (V)-
Dimensione apparente (V)1' x 1'
Caratteristiche fisiche
TipoRegione H II
Classe3 2 2[3]
Dimensioni2,6 a.l.
(0,8 pc)
Caratteristiche rilevantiAvedisova 1494
Altre designazioni
IRAS 01056+6251[1]
Mappa di localizzazione
Sh2-186
Categoria di regioni H II

Sh2-186 è una piccola nebulosa a emissione visibile nella costellazione di Cassiopea.

Si individua nella parte settentrionale della costellazione, alcuni gradi a nordest della stella κ Cassiopeiae; il periodo più indicato per la sua osservazione nel cielo serale ricade fra i mesi di agosto e gennaio ed è notevolmente facilitata per osservatori posti nelle regioni dell'emisfero boreale terrestre, dove si presenta circumpolare fino alle regioni temperate calde.

Si tratta di una regione H II di ridotte dimensioni situata alla distanza di 2600 parsec (8480 anni luce)[2] sul bordo interno del Braccio di Perseo. La ionizzazione dei suoi gas è dovuta alla presenza di un oggetto fortemente oscurato che emette radiazione infrarossa, noto come [DBS2003] 51: si tratta probabilmente di un giovane ammasso aperto originatosi all'interno della nebulosa.[4]

Note

  1. ^ a b c d Simbad Query Result, su simbad.u-strasbg.fr. URL consultato il 10 aprile 2013.
  2. ^ a b c Russeil, D., Star-forming complexes and the spiral structure of our Galaxy, in Astronomy and Astrophysics, vol. 397, gennaio 2003, pp. 133-146, DOI:10.1051/0004-6361:20021504. URL consultato il 10 aprile 2013.
  3. ^ Sharpless, Stewart, A Catalogue of H II Regions., in Astrophysical Journal Supplement, vol. 4, dicembre 1959, p. 257, DOI:10.1086/190049. URL consultato il 10 aprile 2013.
  4. ^ Bica, E.; Dutra, C. M.; Soares, J.; Barbuy, B., New infrared star clusters in the Northern and Equatorial Milky Way with 2MASS, in Astronomy and Astrophysics, vol. 404, giugno 2003, pp. 223-232, DOI:10.1051/0004-6361:20030486. URL consultato il 10 aprile 2013.

Bibliografia

  • Tirion, Rappaport, Lovi, Uranometria 2000.0 - Volume I - The Northern Hemisphere to -6°, Richmond, Virginia, USA, Willmann-Bell, inc., 1987, ISBN 0-943396-14-X.
  • Tirion, Sinnott, Sky Atlas 2000.0 - Second Edition, Cambridge, USA, Cambridge University Press, 1998, ISBN 0-933346-90-5.

Voci correlate

Collegamenti esterni

  • Sky-Map.org - Sharpless Catalogue (from 181 to 190) [collegamento interrotto], su galaxymap.org.
  Portale Oggetti del profondo cielo: accedi alle voci di Wikipedia che trattano di oggetti non stellari

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