NGC 5474

Galaxie
NGC 5474
StarArrowUR.svg
Ursa major constellation map.png
Vorlage:Skymap/Wartung/UMa
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Die Galaxie NGC 5474 aufgenommen mithilfe des Mayall Telescope
AladinLite
SternbildGroßer Bär
Position
Äquinoktium: J2000.0, Epoche: J2000.0
Rektaszension14h 05m 01,6s[1]
Deklination+53° 39′ 44″[1]
Erscheinungsbild
Morphologischer TypSA(s)cd pec / HII[1]
Helligkeit (visuell)10,6 mag[2]
Helligkeit (B-Band)11,3 mag[2]
Winkel­ausdehnung4,7′ × 4,7′[2]
Flächen­helligkeit13,8 mag/arcmin²[2]
Physikalische Daten
ZugehörigkeitLGG 371[1]
Rotverschiebung(911 ± 30) · 10−6[1]
Radial­geschwin­digkeit(273 ± 9) km/s[1]
Hubbledistanz
vrad / H0		(17 ± 1) · 106 Lj
(5,36 ± 0,40) Mpc [1]
Geschichte
EntdeckungWilliam Herschel
Entdeckungsdatum1. Mai 1788
Katalogbezeichnungen
NGC 5474 • UGC 9013 • PGC 50216 • CGCG 272-023 • MCG +09-23-032 • GC 3783 • H I 214 • LDCE 0842 NED011

NGC 5474 ist eine spiralförmige Zwerggalaxie vom Typ Sc im Sternbild Großer Bär und 17 Millionen Lichtjahre von der Milchstraße entfernt. Sie wurde am 1. Mai 1788 von William Herschel entdeckt.[3]

NGC 5474 gehört zur Messier-101-Gruppe, einer Galaxiengruppe, deren bekanntestes Mitglied die namensgebende Galaxie Messier 101 ist. Die Nähe dieses Objektes hat durch ihre gravitativen Kräfte das Aussehen von NGC 5474 stark verzerrt[4].

Weblinks

Einzelnachweise

  1. ↑ a b c d e NASA/IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d SEDS: NGC 5474
  3. ↑ Seligman
  4. ↑ http://www.astronews.com/bilddestages/2014/20140617.shtml

Auf dieser Seite verwendete Medien

StarArrowUR.svg
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A dwarf galaxy ravaged by grand design.jpg
(c) ESA/Hubble, CC BY 4.0
The subject of this new Hubble image is NGC 5474, a dwarf galaxy located 21 million light-years away in the constellation of Ursa Major (The Great Bear). This beautiful image was taken with Hubble's Advanced Camera for Surveys (ACS).

The term "dwarf galaxy" may sound diminutive, but don't let that fool you — NGC 5474 contains several billion stars! However, when compared to the Milky Way with its hundreds of billions of stars, NGC 5474 does indeed seem relatively small.

NGC 5474 itself is part of the Messier 101 Group. The brightest galaxy within this group is the well-known spiral Pinwheel Galaxy (also known as Messier 101, heic0602). This galaxy's prominent, well-defined arms classify it as a "grand design galaxy", along with other spirals Messier 81 (heic0710) and Messier 74 (heic0719).

Also within this group are Messier 101's galactic neighbours. It is possible that gravitational interactions with these companion galaxies have had some influence on providing Messier 101 with its striking shape. Similar interactions with Messier 101 may have caused the distortions visible in NGC 5474.

Both the Messier 101 Group and our own Local Group reside within the Virgo Supercluster, making NGC 5474 something of a neighbour in galactic terms.
NGC5474 - Noao-ngc5474.jpg
Autor/Urheber: Credit:T.A. Rector/University of Alaska Anchorage, H. Schweiker/WIYN and NOIRLab/NSF/AURA, Lizenz: CC BY 4.0
Dwarf Galaxy NGC 5474


Located in the constellation Ursa Major, NGC 5474 is a dwarf galaxy and nearest companion to the large spiral galaxy M101. Strong gravitational interactions with M101 have distorted the shape of NGC 5474, triggering star formation and offsetting the nucleus of the galaxy from the disk. This image was obtained with the wide-field view of the Mosaic Camera on the Mayall 4-meter telescope at Kitt Peak National Observatory. In the image North is up and East is to the left. Imaged May 30, 2008 and February 2, 2010.

Credit:T.A. Rector/University of Alaska Anchorage, H. Schweiker/WIYN and NOIRLab/NSF/AURA
Ursa major constellation map.png
Autor/Urheber: unknown, Lizenz: CC-BY-SA-3.0
NGC 5474 I FUV g2006.jpg
An en:ultraviolet image of NGC 5474 taken with en:GALEX. Credit: GALEX/en:NASA.