NGC 7098
| Galaxie NGC 7098 | |
|---|---|
 | |
| NGC 7098 mit LEDA 246235 (lu)[1] Very Large Telescopes | |
| AladinLite | |
| Sternbild | Oktant |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 21h 44m 16,1s[2] |
| Deklination | −75° 06′ 41″[2] |
| Erscheinungsbild | |
| Morphologischer Typ | (R)SAB(r)a[2] |
| Helligkeit (visuell) | 11,3 mag[3] |
| Helligkeit (B-Band) | 12,2 mag[3] |
| Winkelausdehnung | 4′ × 2,6′[3] |
| Positionswinkel | 74°[3] |
| Flächenhelligkeit | 13,7 mag/arcmin²[3] |
| Physikalische Daten | |
| Rotverschiebung | 0,007942 ± 0,000019[2] |
| Radialgeschwindigkeit | (2381 ± 6) km/s[2] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (101 ± 7) · 106 Lj (30,9 ± 2,2) Mpc [2] |
| Geschichte | |
| Entdeckung | John Herschel |
| Entdeckungsdatum | 22. September 1835 |
| Katalogbezeichnungen | |
| NGC 7098 • PGC 67266 • ESO 048-005 • IRAS 21393-7520 • 2MASX J21441607-7506408 • SGC 213919-7520.5 • GC 4686 • h 3876 • HIPASS J2144-75 | |
NGC 7098 ist eine Balken-Spiralgalaxie vom Hubble-Typ SBa im Sternbild Oktant am Südsternhimmel. Sie ist schätzungsweise 101 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 130.000 Lichtjahren.
Das Objekt wurde am 22. September 1835 von John Herschel entdeckt.[4]
Weblinks
Einzelnachweise
Auf dieser Seite verwendete Medien
Autor/Urheber: Credit: ESO / Acknowledgement: Flickr user Josh Barrington, Lizenz: CC BY 4.0
Seeing double
Approximately 95 million light-years away, in the southern constellation of Octans (The Octant), lies NGC 7098 — an intriguing spiral galaxy with numerous sets of double features. The first of NGC 7098’s double features is a duo of distinct ring-like structures that loop around the galaxy’s hazy heart. These are NGC 7098’s spiral arms, which have wound themselves around the galaxy’s luminous core. This central region hosts a second double feature: a double bar.
NGC 7098 has also developed features known as ansae, visible as small, bright streaks at each end of the central region. Ansae are visible areas of overdensity — they commonly take looping, linear, or circular shapes, and can be found at the extremities of planetary ring systems, in nebulous clouds, and, as is the case with NGC 7098, in parts of galaxies that are packed to the brim with stars.
This image is formed from data gathered by the FOcal Reducer and low dispersion Spectrograph (FORS) instrument, installed on ESO’s Very Large Telescope at Paranal Observatory. An array of distant galaxies are also visible throughout the frame, the most prominent being the small, edge-on, spiral galaxy visible to the left of NGC 7098, known as ESO 048-G007.
Credit:
ESO
Coordinates Position (RA): 21 44 17.11 Position (Dec): -75° 6' 40.13" Field of view: 7.21 x 7.43 arcminutes Orientation: North is -0.0° left of vertical
Colours & filters Band Telescope Optical b 440 nm Very Large Telescope FORS2 Optical v 557 nm Very Large Telescope FORS2 Optical R 655 nm Very Large Telescope FORS2 Optical H-Alpha 660 nm Very Large Telescope FORS2.