NGC 5917
| Galaxie NGC 5917 | |
|---|---|
 (c) ESA/Hubble, CC BY 4.0 | |
| Aufnahme des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Waage |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 15h 21m 32,6s[1] |
| Deklination | -07° 22′ 38″ [1] |
| Erscheinungsbild | |
| Morphologischer Typ | Sb pec? [1] |
| Helligkeit (visuell) | 13,2 mag [2] |
| Helligkeit (B-Band) | 14,0 mag [2] |
| Winkelausdehnung | 1,6' × 0,9' [2] |
| Positionswinkel | 75° [2] |
| Flächenhelligkeit | 13,4 mag/arcmin² [2] |
| Physikalische Daten | |
| Rotverschiebung | 0,006351 ± 0,000120 [1] |
| Radialgeschwindigkeit | (1904 ± 36) km/s [1] |
| Hubbledistanz vrad / H0 | (85 ± 6) · 106 Lj (26 ± 1,9) Mpc [1] |
| Geschichte | |
| Entdeckung | John Herschel |
| Entdeckungsdatum | 16. Juli 1835 |
| Katalogbezeichnungen | |
| NGC 5917 • PGC 54809 • MCG -01-39-002 • IRAS 15188-0711 • Arp 254 • | |
NGC 5917 ist eine Spiralgalaxie des Typs Sb im Sternbild Waage. Sie ist rund 85 Millionen Lichtjahre von der Milchstraße entfernt. Gemeinsam mit PGC 54817 bildet sie das Galaxienpaar Arp 254. Halton Arp gliederte seinen Katalog ungewöhnlicher Galaxien nach rein morphologischen Kriterien in Gruppen. Diese Galaxie gehört zu der Klasse Galaxien mit Anzeichen für eine Aufspaltung.
Die Galaxie wurde von John Herschel am 16. Juli 1835 entdeckt.[3]
Weblinks
Literatur
- Jeff Kanipe und Dennis Webb: The Arp Atlas of Peculiar Galaxies – A Chronicle and Observer´s Guide, Richmond 2006, ISBN 978-0-943396-76-7
Einzelnachweise
Auf dieser Seite verwendete Medien
(c) ESA/Hubble, CC BY 4.0
A cosmic conversatio
This image from Hubble’s Wide Field Camera 3 (WFC3) shows a spiral galaxy NGC 5917, perhaps best known for its intriguing interactions with its neighbouring galaxy MCG-01-39-003 (not visible here, but located off the bottom right of the frame — as seen here).
Mass is often confused with weight, but they are very different things. Mass is the very substance of an object and is something one always has, no matter the location. If you fly to the Moon and experience low-gravity conditions, your mass has not changed at all. What has actually changed is your weight, because weight is a force caused by the gravitational attraction of another massive body. Gravity is how objects with mass “talk” to one another. People do weigh less on the Moon, but not because they have lost any body mass — the mass of the Moon is less than that of the Earth, so it exerts a smaller gravitational pull on them.
Understanding mass is vital when it comes to understanding why objects behave the way they do in space. Without mass “talking” via gravity, the planets would not orbit the Sun, and galaxies would not interact as NGC 5917 does with its neighbour. Galaxy interactions can lead to very interesting effects; the galaxies can steal mass — in form of stars, dust and gas — from one another, distort and warp one another’s shape, or trigger immense waves of new star formation. Sometimes, a galactic duo interact so strongly that they end up colliding and merging completely. Unfortunately, if NGC 5917 is destined to merge with its celestial neighbour, it will happen much too far into the future for us to enjoy the spectacle.
Credit:
ESA/Hubble & NASA
Coordinates Position (RA): 15 21 32.89 Position (Dec): -7° 22' 42.57" Field of view: 2.33 x 1.50 arcminutes Orientation: North is 32.5° left of vertical Colours & filters Band Wavelength Telescope Optical V 555 nm Hubble Space Telescope WFC3 Optical I 814 nm Hubble Space Telescope WFC3 Infrared H 1.6 μm Hubble Space Telescope WFC3 Optical I 814 nm Hubble Space Telescope WFC3 Optical Very Broad 350 nm Hubble Space Telescope WFC3.
Autor/Urheber: ESO: observations by Ferdinando Patat and the Paranal Science team (ESO), final processing by Olivia Blanchemain, Henri Boffin and Haennes Heyer (ESO)., Lizenz: CC BY 4.0
Composite image based on data acquired with the FORS1 multi-mode instrument in April and May 2006 for the European Supernova Collaboration. The observations were made in four different filters (B, V, R, and I) that were combined to make a colour image. The field of view covers 5.6 x 8.3 arcmin. North is up and East is to the left. The observations were done by Ferdinando Patat and the Paranal Science team (ESO), and the final processing was done by Olivia Blanchemain, Henri Boffin and Haennes Heyer (ESO).
ID: phot-22-06
Press Release: ESO 22/06
Long Caption
Object: NGC 5917
Telescope: UT2/Kueyen
Instrument: FORS1
Credit: ESO