Sh2-56

Sh2-56
Regione H II
Sh2-56
Dati osservativi
(epoca J2000)
CostellazioneScudo
Ascensione retta18h 31m :[1]
Declinazione-09° 43′ :[1]
Coordinate galattichel = 22,0; b = +00,0[1]
Distanza15650[2] a.l.
(4800[2] pc)
Magnitudine apparente (V)-
Dimensione apparente (V)7' x 7'
Caratteristiche fisiche
TipoRegione H II
Classe1 2 1[3]
Dimensioni31,9 a.l.
(9,8 pc)
Altre designazioni
RCW 169; LBN 77;[1] Avedisova 329
Mappa di localizzazione
Sh2-56
Categoria di regioni H II

Sh2-56 (nota anche come RCW 169) è una nebulosa a emissione visibile nella costellazione dello Scudo.

Si individua nella parte occidentale della costellazione, circa 1,5° a SW della stella α Scuti; si estende per 7 minuti d'arco in direzione di una regione della Via Lattea fortemente oscurata da dense nubi di polveri, fra le quali spicca il complesso di Barnard 97. Il periodo più indicato per la sua osservazione nel cielo serale ricade fra giugno e novembre; trovandosi a soli 9° dall'equatore celeste, può essere osservata indistintamente da tutte le regioni popolate della Terra.

Si tratta di una remota regione H II situata sul Braccio Scudo-Croce alla distanza di circa 4800 parsec (circa 15650 anni luce), in una regione molto interna della Via Lattea; fa parte di una regione di formazione stellare dominata dalle forti emissioni alla lunghezza d'onda H2O provenienti dal maser GAL 021.88+00.02.[4] Oltre a quest'oggetto, vi è anche la sorgente di radiazione infrarossa IRAS 18282-0943,[5] coincidente con la giovane protostella 2MASS J18310242-0941134, che si presenta circondata da un involucro individuabile anche alla lunghezza d'onda OH.[6][7]

Note

  1. ^ a b c d Simbad Query Result, su simbad.u-strasbg.fr. URL consultato il 3 settembre 2011.
  2. ^ a b 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 3 settembre 2011.
  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 3 settembre 2011.
  4. ^ Genzel, R.; Downes, D., H2O in the Galaxy. II - Duration of the maser phase and the galactic distribution of H2O sources, in Astronomy and Astrophysics, vol. 72, n. 1-2, febbraio 1979, pp. 234-240. URL consultato il 3 settembre 2011.
  5. ^ Helou, George; Walker, D. W., Infrared astronomical satellite (IRAS) catalogs and atlases. Volume 7: The small scale structure catalog, in Infrared astronomical satellite (IRAS) catalogs and atlases, vol. 7, 1988, pp. 1-265. URL consultato il 3 settembre 2011.
  6. ^ Simbad Query Result, su simbad.u-strasbg.fr. URL consultato il 3 settembre 2011.
  7. ^ Avedisova, V. S., A Catalog of Star-Forming Regions in the Galaxy, in Astronomy Reports, vol. 46, n. 3, marzo 2002, pp. 193-205, DOI:10.1134/1.1463097. URL consultato il 3 settembre 2011.

Bibliografia

  • Tirion, Rappaport, Lovi, Uranometria 2000.0 - Volume II - The Southern Hemisphere to +6°, Richmond, Virginia, USA, Willmann-Bell, inc., 1987, ISBN 0-943396-15-8.
  • 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 51 to 60), su galaxymap.org. URL consultato il 3 settembre 2011 (archiviato dall'url originale il 30 settembre 2011).
  • Sky-Map.org - RCW Catalogue (from 161 to 170) [collegamento interrotto], su galaxymap.org.
  • Avesidova 329 - Sky-Map.org, su galaxymap.org.
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