NGC 23
Galaxie NGC 23 | |
---|---|
SDSS-Aufnahme | |
AladinLite | |
Sternbild | Pegasus |
Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
Rektaszension | 00h 09m 53,41s[1] |
Deklination | +25° 55′ 25,6″[1] |
Erscheinungsbild | |
Morphologischer Typ | SB(s)ab / HII / LIRG / Sbrst[1] |
Helligkeit (visuell) | 11,9 mag[2] |
Helligkeit (B-Band) | 12,8 mag[2] |
Winkelausdehnung | 2,1′ × 1,3′[2] |
Positionswinkel | 174,2°[2] |
Flächenhelligkeit | 12,8 mag/arcmin²[2] |
Physikalische Daten | |
Zugehörigkeit | NGC 23-Gruppe LGG 2[1][3] |
Rotverschiebung | 0.015227 ± 0.000007[1] |
Radialgeschwindigkeit | (4565 ± 2) km/s[1] |
Hubbledistanz H0 = 73 km/(s • Mpc) | (211 ± 15) · 106 Lj (64,8 ± 4,5) Mpc [1] |
Durchmesser | 130.000 Lj[4] |
Geschichte | |
Entdeckung | Wilhelm Herschel |
Entdeckungsdatum | 10. September 1784 |
Katalogbezeichnungen | |
NGC 23 • UGC 89 • PGC 698 • CGCG 477-62 • CGCG 478-34 • MCG +04-01-033 • IRAS 00073+2538 • KUG 0007+256 • 2MASX J00095341+2555254 • Mrk 545 • GC 9 • H III 147 • GALEXASC J000953.40+255524.9 • NVSS J000953+255526 • WISEA J000953.41+255526.0 |
NGC 23 ist eine aktive Balken-Spiralgalaxie mit hoher Sternentstehungsrate vom Hubble-Typ SBa im Sternbild Pegasus am Nordsternhimmel. Sie ist schätzungsweise 211 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 130.000 Lichtjahren. Wahrscheinlich bildet sie gemeinsam mit NGC 26 ein gebundenes Galaxienpaar. Sie ist Mitglied der Galaxiengruppe LGG 2 oder NGC 23-Gruppe.
Aufnahmen
- Falschfarbendarstellung des Zentrums der Galaxie, aufgenommen mit der NICMOS-Kamera des HST bei 1,1 µm, 1,6 µm und 1,9 µm.
Die Supernova SN 1955C wurde hier entdeckt.[5]
Das Objekt wurde am 10. September 1784 vom deutsch-britischen Astronomen Wilhelm Herschel entdeckt.[6]
NGC 23-Gruppe
Galaxie | Alternativname | Entfernung/Mio. Lj |
---|---|---|
NGC 1 | PGC 564 | 211 |
NGC 23 | PGC 698 | 212 |
NGC 26 | PGC 732 | 213 |
PGC 912 | UGC 127 | 217 |
PGC 619 | UGC 69 | 215 |
PGC 654 | UGC 79 | 201 |
PGC 830 | UGC 110 | 209 |
Weblinks
Einzelnachweise
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Autor/Urheber: Fabian RRRR, Lizenz: CC BY-SA 3.0
RGB composite of Hubble images made at wavelengths 1100nm, 1600nm and 1900nm. The composite is logarithmic scales and done by Aladin-software (2000A&AS..143...33B.)
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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/