NGC 2441

Galaxie
NGC 2441
{{{Kartentext}}}
Aufnahme des Hubble-Weltraumteleskops
AladinLite
SternbildGiraffe
Position
Äquinoktium: J2000.0, Epoche: J2000.0
Rektaszension07h 51m 54,7s[1]
Deklination+73° 00′ 56″[1]
Erscheinungsbild
Morphologischer TypSAB(r)b:[1]
Helligkeit (visuell)12,1 mag[2]
Helligkeit (B-Band)12,9 mag[2]
Winkel­ausdehnung2′ × 1,8′[2]
Positionswinkel45°[2]
Flächen­helligkeit13,3 mag/arcmin²[2]
Physikalische Daten
ZugehörigkeitLGG 154
LDCE 573[1][3]
Rotverschiebung0,011562 ± 0,000001[1]
Radial­geschwin­digkeit(3466 ± 1) km/s[1]
Hubbledistanz
H0 = 73 km/(s • Mpc)		(160 ± 11) · 106 Lj
(49,1 ± 3,5) Mpc [1]
Durchmesser95.000 Lj[4]
Geschichte
EntdeckungErnst Tempel
Entdeckungsdatum8. August 1882
Katalogbezeichnungen
NGC 2441 • UGC 4036 • PGC 22031 • CGCG 331-017 • MCG +12-08-015 • IRAS 07460+7308 • 2MASX J07515477+7300564 •

NGC 2441 ist eine Balken-Spiralgalaxie im Sternbild Giraffe am Nordsternhimmel. Sie ist schätzungsweise 160 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 90.000 Lichtjahren.

Die Typ-Ia-Supernova SN 1995E wurde hier beobachtet.[5]

Das Objekt wurde am 8. August 1882 vom Astronomen Ernst Wilhelm Leberecht Tempel mit einem 24-cm-Teleskop entdeckt.[6]

Commons: NGC 2441 – Sammlung von Bildern, Videos und Audiodateien

Einzelnachweise

  1. ↑ a b c d e NASA/IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS: NGC 2441
  3. ↑ VizieR
  4. ↑ NASA/IPAC
  5. ↑ Simbad SN
  6. ↑ Seligman

Auf dieser Seite verwendete Medien

Potw1425a.tif
Autor/Urheber: Credit: ESA/Hubble & NASA Acknowledgement: Nick Rose, Lizenz: CC BY 3.0
A curious supernova in NGC 2441


This bright spiral galaxy is known as NGC 2441, located in the northern constellation of Camelopardalis (The Giraffe). However, NGC 2441 is not the only subject of this new Hubble image; the galaxy contains an intriguing supernova named SN1995E, visible as a small dot at the approximate centre of this image. For a labelled view, see potw1425b.

Supernova SN1995E, discovered in 1995 as its name suggests is a type Ia supernova. This kind of supernova is found in binary systems, where one star — a white dwarf — drags matter from its orbiting companion until it becomes unstable and explodes violently. White dwarf stars all become unbalanced once they reach the same mass, meaning that they all form supernovae with the same intrinsic brightness. Because of this, they are used as standard candles to measure distances in the Universe.

But SN1995E may be useful in another way. More recent observations of this supernova have suggested that it may display a phenomenon known as a light echo, where light is scattered and deflected by dust along our line of sight, making it appear to “echo” outwards from the source. In 2006, Hubble observed SN1995E to be fading in a way that suggested its light was being scattered by a surrounding spherical shell of dust. These echoes can be used to probe both the environments around cosmic objects like supernovae, and the characteristics of their progenitor stars. If SN1995E does indeed have a light echo, it would belong to a very elite club; only two other type Ia supernovae have been found to display light echoes (SN1991T and SN1998bu).

NGC 2441 was first seen by Wilhelm Tempel in 1882, a German astronomer with a keen eye for comets. In total, Tempel observed and documented some 21 comets, several of which were named after him.

A version of this image was entered into the Hubble’s Hidden Treasures image processing competition by contestant Nick Rose.

Credit: ESA/Hubble & NASA

Acknowledgement: Nick Rose

About the Object 

Name:	   NGC 2441, SN 1995E
Type:	   • Local Universe : Galaxy : Type : Spiral
          • X - Galaxies Images/Videos
Distance: 180 million light years

Colours & filters Band Wavelength Telescope 

Optical B 	435 nm 	Hubble Space Telescope ACS
Optical V 	555 nm 	Hubble Space Telescope ACS
.