NGC 4242

Galaxie
NGC 4242
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SDSS-Aufnahme
AladinLite
SternbildJagdhunde
Position
ÄquinoktiumJ2000.0, Epoche: J2000.0
Rektaszension12h 17m 30,2s[1]
Deklination+45° 37′ 09″[1]
Erscheinungsbild
Morphologischer TypSAB(s)dm[1]
Helligkeit (visuell)10,9 mag[2]
Helligkeit (B-Band)11,5 mag[2]
Winkel­ausdehnung5,2′ × 4,0′[2]
Positionswinkel25°[2]
Flächen­helligkeit14,0 mag/arcmin²[2]
Physikalische Daten
Rotverschiebung0.001688 ± 0.000007[1]
Radial­geschwin­digkeit(506 ± 2) km/s[1]
Hubbledistanz
H0 = 73 km/(s • Mpc)
(25 ± 2) · 106 Lj
(7,67 ± 0,54) Mpc [1]
Geschichte
EntdeckungWilliam Herschel
Entdeckungsdatum10. April 1788
Katalogbezeichnungen
NGC 4242 • UGC 7323 • PGC 39423 • CGCG 243-061 • MCG +08-22-098 • 2MASX J12173687+4753209 • GC 2830 • H III 725 • h 1166 • USGC U480 NED25

NGC 4242 ist eine Balken-Spiralgalaxie vom Hubble-Typ SBd im Sternbild Jagdhunde am Nordsternhimmel. Sie ist schätzungsweise 25 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 35.000 Lj.

Die Typ-IIn(?)-Supernova SN 2002bu wurde hier beobachtet.[3]

Das Objekt wurde am 10. April 1788 von dem Astronomen William Herschel mit Hilfe seines 18,7-Zoll-Teleskops entdeckt.[4]

Commons: NGC 4242 – Sammlung von Bildern, Videos und Audiodateien

Einzelnachweise

  1. a b c d NASA/IPAC EXTRAGALACTIC DATABASE
  2. a b c d e SEDS: NGC 4242
  3. Simbad
  4. Seligman

Auf dieser Seite verwendete Medien

Dim and diffuse.jpg
(c) ESA/Hubble, CC BY 4.0
Tucked away in the small northern constellation of Canes Venatici (The Hunting Dogs) is the galaxy NGC 4242, shown here as seen by the NASA/ESA Hubble Space Telescope. The galaxy lies some 30 million light-years from us. At this distance from Earth, actually not all that far on a cosmic scale, NGC 4242 is visible to anyone armed with even a basic telescope (as British astronomer William Herschel found when he discovered the galaxy in 1788). This image shows the galaxy’s bright centre and the surrounding dimmer and more diffuse “fuzz”. Despite appearing to be relatively bright in this image, studies have found that NGC 4242 is actually relatively dim (it has a moderate-to-low surface brightness and low luminosity) and also supports a low rate of star formation. The galaxy also seems to have a weak bar of stars cutting through its asymmetric centre, and a very faint and poorly-defined spiral structure throughout its disc. But if NGC 4242 is not all that remarkable, as with much of the Universe, it is still a beautiful and ethereal sight.
NGC4242 - SDSS DR14 (panorama).jpg
Autor/Urheber: Sloan Digital Sky Survey, Lizenz: CC BY 4.0
Color mapping
The sky image is obtained by Sloan Digital Sky Survey, DR14 with SciServer.

Angle of view: 8' × 8' (0.3" per pixel), north is up.

Details on the image processing pipeline: https://www.sdss.org/dr14/imaging/jpg-images-on-skyserver/