NGC 684

NGC 684
Galassia a spirale
NGC 684 nelle immagini SDSS
Scoperta
ScopritoreWilliam Herschel
Data26 ottobre 1786 [1]
Dati osservativi
(epoca J2000)
CostellazioneTriangolo
Ascensione retta01h 50m 14.0s [2]
Declinazione27° 38′ 44″ [2][1]
Distanza157,0 milioni di a.l. [2]
(48,15 Mpc) [2]
Magnitudine apparente (V)12,4 [3]
nella banda B: 13,3 [3]
Redshift+0,011798 ± 0,000002 [2]
Luminosità superficiale13,11 [3]
Angolo di posizione87° [3]
Velocità radiale3537 ± 1 [2] km/s
Caratteristiche fisiche
TipoGalassia a spirale
ClasseSb [2][3][1]
Dimensioni137 500 anni luce (42 150 pc) a.l.  
Altre designazioni
IC 165
PGC 6759
MCG 4-5-17
UGC 1292
CGCG 482-22
IRAS 01474+2724 [3]
Mappa di localizzazione
NGC 684
Categoria di galassie a spirale

NGC 684 è una galassia a spirale situata nella costellazione del Triangolo, a una distanza di circa 157 milioni di anni luce dalla nostra Via Lattea.[1]

Scoperta

La galassia è stata scoperta il 26 ottobre 1786 dall'astronomo britannico di origine tedesca William Herschel. Il 18 gennaio 1890 è stata riosservata dall'astronomo statunitense Edward D. Swift e in seguito inclusa nell'Index Catalogue con il codice IC 165.[1]

Descrizione

NGC 684 ha una classe di luminosità II e presenta una larga riga a 21 cm dell'idrogeno neutro.[2]

Gruppo di NGC 661

NGC 684 fa parte del Gruppo di NGC 661, un raggruppamento che contiene almeno quattro galassie.[4] Oltre a NGC 684, il gruppo comprende anche le galassie NGC 661, NGC 670 e IC 1731. NGC 684 è la galassia più estesa del gruppo. Garcia, nel suo articolo del 1993 considera il gruppo composto di tre galassie e non vi include NGC 661.[5]

Note

  1. ^ a b c d e (EN) Courtney Seligman, Celestial Atlas Table of Contents, NGC 684, su cseligman.com. URL consultato il 28 giugno 2024.
  2. ^ a b c d e f g h Results for object NGC 684, su ned.ipac.caltech.edu, National Aeronautics and Space Administration / Infrared Processing and Analysis Center. URL consultato il 28 giugno 2024.
  3. ^ a b c d e f (FR) Les données de «Revised NGC and IC Catalog by Wolfgang Steinicke», NGC 600 à 699, su astrovalleyfield.ca. URL consultato il 28 giugno 2024.
  4. ^ Abraham Mahtessian, Groups of galaxies. III. Some empirical characteristics (PDF), in Astrophysics, 41 #3, luglio 1998, pp. 308-321, DOI:10.1007/BF03036100. URL consultato il 15 giugno 2024.
  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 682  •  NGC 683  •  NGC 684  •  NGC 685  •  NGC 686
  Portale Astronomia

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