Sh2-120

Sh2-120
Regione H II
Sh2-120
Dati osservativi
(epoca J2000)
CostellazioneCigno
Ascensione retta21h 04m 07s[1]
Declinazione+49° 53′ 06″[1]
Coordinate galattichel = 90,3; b = +02,0[1]
Distanza20500?[2] a.l.
(6300?[2] pc)
Magnitudine apparente (V)-
Dimensione apparente (V)1' x 1'
Caratteristiche fisiche
TipoRegione H II
Classe1 1 1[3]
Altre designazioni
Avedisova 1152
Mappa di localizzazione
Sh2-120
Categoria di regioni H II

Sh2-120 è una nebulosa a emissione visibile nella costellazione del Cigno.

Si individua nella parte settentrionale della costellazione, circa 6° a nordovest della brillante stella Deneb; il periodo più indicato per la sua osservazione nel cielo serale ricade fra i mesi di luglio e dicembre e, a causa della sua declinazione fortemente settentrionale, è notevolmente facilitata per osservatori posti nelle regioni dell'emisfero boreale terrestre.

Si presenta come una piccola nube dalla forma circolare del diametro di appena un primo d'arco, situata in una regione galattica parzialmente oscurata da densi banchi di polveri situati in primo piano rispetto alla nube stessa, come LDN 988; si tratta di un oggetto poco studiato la cui distanza è stata stimata attorno ai 6300 parsec (20500 anni luce) dal sistema solare,[2] in una regione remota sul bordo esterno del Braccio di Perseo. Uno studio del 1978 indica per questa e per la vicina Sh2-121 una distanza approssimativa di almeno 7500 parsec, affermando esplicitamente che, assieme a Sh2-127 e Sh2-128, farebbero parte di una struttura galattica esterna rispetto al Braccio di Perseo.[4] Il catalogo Avedisova la inserisce in una regione di formazione stellare assieme alla sorgente di radiazione infrarossa IRAS 21020+4939 e ad alcune sorgenti di onde radio.[5]

Note

  1. ^ a b c Simbad Query Result, su simbad.u-strasbg.fr. URL consultato il 7 febbraio 2012.
  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 7 febbraio 2012.
  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 7 febbraio 2012.
  4. ^ Crampton, D.; Georgelin, Y. M.; Georgelin, Y. P., First optical detection of W51 and observations of new H II regions and exciting stars, in Astronomy and Astrophysics, vol. 66, n. 1-2, maggio 1978, pp. 1-11. URL consultato il 7 febbraio 2012.
  5. ^ 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 7 febbraio 2012.

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 111 to 120) [collegamento interrotto], su galaxymap.org.
  • Avesidova 1152 - Sky-Map.org, su galaxymap.org.
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