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
verbreitet werden – vervielfältigt, verbreitet und öffentlich zugänglich gemacht werden
neu zusammengestellt werden – abgewandelt und bearbeitet werden
Zu den folgenden Bedingungen:
Namensnennung – Du musst angemessene Urheber- und Rechteangaben machen, einen Link zur Lizenz beifügen und angeben, ob Änderungen vorgenommen wurden. Diese Angaben dürfen in jeder angemessenen Art und Weise gemacht werden, allerdings nicht so, dass der Eindruck entsteht, der Lizenzgeber unterstütze gerade dich oder deine Nutzung besonders.
https://creativecommons.org/licenses/by/3.0CC BY 3.0 Creative Commons Attribution 3.0 truetrue
Kurzbeschreibungen
Ergänze eine einzeilige Erklärung, was diese Datei darstellt.
== {{int:filedesc}} == {{Information |Description ={{en|1='''A curious supernova in NGC 2441 A curious supernova in NGC 2441 Click to Enlarge This bright spiral galaxy is known as NGC 2441, located in the northern constellation of Camelopardalis (T...
Diese Datei enthält weitere Informationen (beispielsweise Exif-Metadaten), die in der Regel von der Digitalkamera oder dem verwendeten Scanner stammen. Durch nachträgliche Bearbeitung der Originaldatei können einige Details verändert worden sein.
Breite
2.913 px
Höhe
1.861 px
Bits pro Farbkomponente
8
8
8
Art der Kompression
LZW
Pixelzusammensetzung
RGB
Kameraausrichtung
Normal
Anzahl Komponenten
3
Anzahl Zeilen pro Streifen
29
Horizontale Auflösung
72 dpi
Vertikale Auflösung
72 dpi
Datenausrichtung
Grobformat
Software
Adobe Photoshop CS6 (Windows)
Speicherzeitpunkt
18:12, 6. Feb. 2014
Farbraum
Nicht kalibriert
warning
wrong data type 7 for "XMLPacket"; tag ignored. wrong data type 7 for "RichTIFFIPTC"; tag ignored. wrong data type 7 for "Photoshop"; tag ignored.