NGC 1706
Galaxie NGC 1706 | |
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(c) ESA/Hubble, CC BY 4.0 | |
NGC 1706 mit LEDA 177963[1] Hubble-Weltraumteleskop | |
AladinLite | |
Sternbild | Schwertfisch |
Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
Rektaszension | 04h 52m 31,02s[2] |
Deklination | −62° 59′ 08,8″[2] |
Erscheinungsbild | |
Morphologischer Typ | SA(s)ab[2] |
Helligkeit (visuell) | 12,8 mag[3] |
Helligkeit (B-Band) | 13,6 mag[3] |
Winkelausdehnung | 1,4′ × 1′[3] |
Positionswinkel | 124°[3] |
Flächenhelligkeit | 13,0 mag/arcmin²[3] |
Physikalische Daten | |
Zugehörigkeit | SSRS-Gruppe 11 LGG 125[2][4] |
Rotverschiebung | 0.016308 ± 0.000087[2] |
Radialgeschwindigkeit | (4889 ± 26) km/s[2] |
Hubbledistanz H0 = 73 km/(s • Mpc) | (210 ± 15) · 106 Lj (64,4 ± 4,5) Mpc [2] |
Geschichte | |
Entdeckung | John Herschel |
Entdeckungsdatum | 25. Dezember 1837 |
Katalogbezeichnungen | |
NGC 1706 • PGC 16220 • ESO 085-007 • 2MASX J04523101-6259089 • SGC 045203-6304.0 • GC 938 • h 2682 • GALEXASC J045231.34-625909.0 • LDCE 357 NED002 |
NGC 1706 ist eine Spiralgalaxie vom Hubble-Typ Sab im Sternbild Dorado am Südsternhimmel. Sie ist schätzungsweise 210 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 90.000 Lichtjahren. Gemeinsam mit NGC 1771 und PGC 16670 bildet sie die kleine Galaxiengruppe LGG 125.
Das Objekt wurde von dem britischen Astronomen John Herschel am 25. Dezember 1837 mithilfe seines 18,7-Zoll-Spiegelteleskops entdeckt.[5]
NGC 1706-Gruppe (LGG 125)
Galaxie | Alternativname | Entfernung / Mio. Lj |
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PGC 16670 | ESO 85-038 | 208 |
NGC 1771 | PGC 16472 | 215 |
NGC 1706 | PGC 16220 | 210 |
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(c) ESA/Hubble, CC BY 4.0
Lonely Hearts Club
Galaxies may seem lonely, floating alone in the vast, inky blackness of the sparsely populated cosmos — but looks can be deceiving. The subject of this Picture of the Week, NGC 1706, is a good example of this. NGC 1706 is a spiral galaxy, about 230 million light-years away, in the constellation of Dorado (The Swordfish).
NGC 1706 is known to belong to something known as a galaxy group, which is just as the name suggests — a group of up to 50 galaxies which are gravitationally bound and hence relatively close to each other. Around half of the galaxies we know of in the Universe belong to some kind of group, making them incredibly common cosmic structures. Our home galaxy, the Milky Way, belongs to the Local Group, which also contains the Andromeda Galaxy, the Large and Small Magellanic Clouds, and the Triangulum Galaxy.
Groups are the smallest of galactic gatherings; others are clusters, which can comprise hundreds of thousands of galaxies bound loosely together by gravity, and subsequent superclusters, which bring together numerous clusters into a single entity.
Credit:
ESA/Hubble & NASA, A. Bellini et al.
Coordinates Position (RA): 4 52 31.14 Position (Dec): -62° 59' 9.28" Field of view: 3.18 x 1.59 arcminutes Orientation: North is 64.7° left of vertical
Colours & filters Band Wavelength Telescope Optical V 606 nm Hubble Space Telescope ACS Optical I 814 nm Hubble Space Telescope ACS.