NGC 845

NGC 845
Galassia a spirale
NGC 845 nelle immagini Pan-STARRS
Scoperta
ScopritoreJohn Herschel
Dataottobre 1828 [1]
Dati osservativi
(epoca J2000)
CostellazioneAndromeda
Ascensione retta02h 12m 19.8s [2]
Declinazione37° 28′ 38″ [2][1]
Distanza202,0 milioni di a.l.
(61,94 Mpc) [2]
Magnitudine apparente (V)13,5 [3]
nella banda B: 14,3 [3]
Redshift+0,014787 ± 0,000019 [2]
Luminosità superficiale13,08
Angolo di posizione149° [3]
Velocità radiale4433 ± 6 [2] km/s
Caratteristiche fisiche
TipoGalassia a spirale
ClasseSb [2][3], Sb? [1]
Dimensioni91 600 a.l.
(28 090 pc)
Altre designazioni
PGC 8438
MCG 6-5-104
UGC 1695
CGCG 522-135
IRAS 02093+3714 [3]
Mappa di localizzazione
NGC 845
Categoria di galassie a spirale

NGC 845 è una galassia a spirale situata nella costellazione di Andromeda, a una distanza di circa 202 milioni di anni luce dalla nostra Via Lattea.[1]

Scoperta

La galassia è stata scoperta nell'ottobre 1828 dall'astronomo britannico John Herschel.[1]

Descrizione

NGC 845 ha una classe di luminosità II e presenta una larga riga a 21 cm dell'idrogeno neutro.[2]

Gruppo di NGC 841

NGC 845 fa parte del Gruppo di NGC 841, che comprende sei galassie luminose nei raggi X. Le altre cinque galassie componenti il gruppo sono NGC 834, NGC 841, UGC 1650, UGC 1673 e UGC 1721.[4] Anche la galassia UGC 1771 fa parte di questo gruppo, ma non è luminosa ai raggi X.[5]

Note

  1. ^ a b c d e (EN) Courtney Seligman, Celestial Atlas Table of Contents, NGC 845, su cseligman.com. URL consultato il 30 agosto 2024.
  2. ^ a b c d e f g Results for object NGC 845, su ned.ipac.caltech.edu, National Aeronautics and Space Administration / Infrared Processing and Analysis Center. URL consultato il 30 agosto 2024.
  3. ^ a b c d e (FR) Les données de «Revised NGC and IC Catalog by Wolfgang Steinicke», NGC 800 à 899, su astrovalleyfield.ca. URL consultato il 30 agosto 2024.
  4. ^ Chandreyee Sengupta e Ramesh Balasubramanyam, HI content in galaxies in loose groups (PDF), in Monthly Notices of the Royal Astronomical Society, 369 #1, giugno 2006, p. 360-368, Bibcode:2006MNRAS.369..360S, DOI:10.1111/j.1365-2966.2006.10307.x.
  5. ^ A.M. Garcia, General study of group membership. II - Determination of nearby groups, in Astronomy and Astrophysics Supplement Series, 100 #1, luglio 1993, pp. 47-90, Bibcode:1993A&AS..100...47G.

Voci correlate

Altri progetti

Collegamenti esterni

New General Catalogue: NGC 843  •  NGC 844  •  NGC 845  •  NGC 846  •  NGC 847
  Portale Astronomia

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