IC 5146

Nebulosa Bozzolo
Regione H II
Dati osservativi
(epoca J2000.0)
CostellazioneCigno
Ascensione retta21h 53m 24s
Declinazione+47° 16′ 00″
Distanza3300 a.l.
(1012 pc)
Magnitudine apparente (V)(10)
Dimensione apparente (V)30′
Caratteristiche fisiche
TipoRegione H II
Altre designazioni
C 19; Sh2-125
Mappa di localizzazione
IC 5146
Categoria di regioni H II

IC 5146, (noto anche come C 19), è un ammasso aperto legato ad una nebulosa diffusa visibile nella costellazione del Cigno.

Si individua 3,5 gradi ad est di M39, nella parte settentrionale della costellazione; è invisibile con un binocolo, occorre un telescopio di 150mm per apprezzare l'oggetto minimamente. È un piccolo ammasso circondato da una nebulosa molto raccolta (a forma di Bozzolo), connessa a sua volta ad un sistema di nebulosità oscure, conosciute con la sigla B 168, che si estende per circa 2 gradi in direzione di M39, evidentissima anche con piccoli strumenti in quanto oscura un ricco campo stellare. La stella principale dell'ammasso ha magnitudine 9,74 (probabilmente però appare solo in "sovraimpressione" per motivi prospettici, perché la sua distanza sarebbe inferiore a quella dell'ammasso). Quest'insieme di nebulose avrebbero una distanza dal Sole pari a circa 3300 anni-luce.

Bibliografia

  • Catalogo NGC/IC online, su ngcicproject.org. URL consultato il 7 settembre 2009 (archiviato dall'url originale il 28 maggio 2009).
  • Tirion, Rappaport, Lovi, Uranometria 2000.0, William-Bell inc. ISBN 0-943396-14-X

Voci correlate

Altri progetti

La nebulosa bozzolo che caratterizza l'ammasso.
  Portale Oggetti del profondo cielo: accedi alle voci di Wikipedia che trattano di oggetti non stellari

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