NGC 4217
| Galaxie NGC 4217 | |
|---|---|
 | |
| SDSS-Aufnahme | |
| AladinLite | |
| Sternbild | Jagdhunde |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 12h 15m 50,9s[1] |
| Deklination | +47° 05′ 30″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | SAb sp / HII[1] |
| Helligkeit (visuell) | 11,3 mag[2] |
| Helligkeit (B-Band) | 12,1 mag[2] |
| Winkelausdehnung | 5,2′ × 1,5′[2] |
| Positionswinkel | 50°[2] |
| Flächenhelligkeit | 13,4 mag/arcmin²[2] |
| Physikalische Daten | |
| Zugehörigkeit | UMa-Gruppe NGC 3992-Gruppe LGG 258[1][3] |
| Rotverschiebung | 0.003426 ± 0.000010[1] |
| Radialgeschwindigkeit | 1027 ± 3 km/s[1] |
| Hubbledistanz vrad / H0 | (49 ± 3) · 106 Lj (14,9 ± 1,0) Mpc [1] |
| Geschichte | |
| Entdeckung | Wilhelm Herschel |
| Entdeckungsdatum | 10. April 1788 |
| Katalogbezeichnungen | |
| NGC 4217 • UGC 7282 • PGC 39241 • CGCG 243-053 • MCG +08-22-087 • IRAS F12133+4722 • 2MASX J12155089+4705304 • GC 2807 • H II 748 • h 1149 • LDCE 867 NED092 • HOLM 354A | |
NGC 4217 ist eine Spiralgalaxie vom Hubble-Typ Sb im Sternbild Jagdhunde am Nordsternhimmel. Sie ist schätzungsweise 49 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 75.000 Lichtjahren. Bei dem Objekt handelt es sich um eine sogenannte Edge-On-Galaxie, d. h. wir sehen sie genau in Kantenstellung. Die Spiralarme erscheinen hier nur als dunkle staubhaltige Wolken, beleuchtet vom hellen Zentrum der Galaxie. Gemeinsam mit NGC 4226 bildet sie das, optische, Galaxienpaar Holm 354.
Im selben Himmelsareal befinden sich u. a. die Galaxien NGC 4220, NGC 4231, NGC 4232, NGC 4248.
UV-Aufnahme (GALEX)
(c) ESA/Hubble, CC BY 4.0Hochaufgelöste Detailaufnahme des Hubble-Weltraumteleskops
Das Objekt wurde am 10. April 1788 von dem Astronomen Wilhelm Herschel mit Hilfe seines 18,7 Zoll-Spiegelteleskops entdeckt.[4]
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(c) ESA/Hubble, CC BY 4.0
Dust filaments of NGC 4217
In this image the NASA/ESA Hubble Space Telescope takes a close look at the spiral galaxy NGC 4217, 60 million light-years away. The galaxy is seen almost perfectly edge on and is a perfect candidate for studying the nature of extraplanar dust structures — the patterns of gas and dust above and below the plane on the galaxy, seen here as brown wisps coming off NGC 4217.
These tentacle-like filaments are visible in the Hubble image only because the contrast with their surroundings is so high. This implies that the structures are denser than their surroundings. The image shows dozens of dust structures some of which reach as far as 7000 light-years away from the central plane. Typically the structures have a length of about 1000 light-years and are about 400 light-years in width.
Some of the dust filaments are round or irregular clouds, others are vertical columns, looplike structures or vertical cones. These structures can help astronomers to identify the mechanisms responsible for the ejection of gas and dust from the galactic plane of spiral galaxies and reveal information on the transport of the interstellar medium to large distances away from galactic discs.
The properties of the observed dust structures in NGC 4217 suggest that the gas and dust was driven out of the midplane of the galaxy by powerful stellar winds resulting from supernovae — explosions that mark the deaths of massive stars.
This image was entered into the Hubble Hidden Treasures competition by contestant Ralf Schoofs.
Credit:
Credit: ESA/Hubble & NASA Acknowledgement: R. Schoofs
About the Object
Name: NGC 4217
Type: • Local Universe : Galaxy : Type : Spiral
• Local Universe : Galaxy : Component : Disk
• Local Universe : Galaxy : Component : Dust Lane
Distance: 60 million light years
Constellation: Canes Venatici
Colours & filters Band Wavelength Telescope Infrared I 814 nm Hubble Space Telescope WFPC2 Optical V 555 nm Hubble Space Telescope WFPC2 Optical B 450 nm Hubble Space Telescope WFPC2.
NGC 4217 by GALEX
Autor/Urheber: Sloan Digital Sky Survey, Lizenz: CC BY 4.0
The sky image is obtained by Sloan Digital Sky Survey, DR14 with SciServer.
Angle of view: 4' × 4' (0.3" per pixel), north is up.
Details on the image processing pipeline: https://www.sdss.org/dr14/imaging/jpg-images-on-skyserver/