VdB 145


vdB 145
Nebulosa a riflessione
vdB 145
Dati osservativi
(epoca J2000)
CostellazioneCigno
Ascensione retta21h 43m 37s[1]
Declinazione+48° 53′ 02″[1]
Coordinate galattichel = 94,2; b = -03,2[1]
Distanza?[2] a.l.
(?[2] pc)
Magnitudine apparente (V)8,06 (stella centrale)[3]
Dimensione apparente (V)9' x 9'
Caratteristiche fisiche
TipoNebulosa a riflessione
ClasseI[3]
Mappa di localizzazione
VdB 145
Categoria di nebulose a riflessione

vdB 145 è una piccola nebulosa a riflessione visibile nella costellazione del Cigno.

Si individua nella parte nordorientale della costellazione, a meno di 1° di distanza a SW della stella π2 Cygni, in direzione di una regione della Via Lattea molto ricca di nebulose oscure; il periodo più indicato per la sua osservazione nel cielo serale ricade fra i mesi di luglio e dicembre ed è notevolmente facilitata per osservatori posti nelle regioni dell'emisfero boreale terrestre. La nebulosa riflette la luce della stella HD 206887, una gigante gialla con classe spettrale F2II o F2III avente magnitudine apparente pari a 8,06.[1] La sua distanza non è nota con precisione e la misura della parallasse risulta essere inutilizzabile in quanto negativa;[2] è comunque certamente compresa all'interno del Braccio di Orione.

Note

  1. ^ a b c d Simbad Query Result, su simbad.u-strasbg.fr. URL consultato il 7 maggio 2013.
  2. ^ a b c VizieR services - star catalogues, in result for HD 206887. URL consultato il 7 maggio 2013.
  3. ^ a b van den Bergh, S., A study of reflection nebulae., in Astronomical Journal, vol. 71, dicembre 1966, pp. 990-998, DOI:10.1086/109995. URL consultato il 7 maggio 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.

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