NGC 1356
| Galaxie NGC 1356 | |
|---|---|
 (c) Credit: ESA/Hubble & NASA, J. Dalcanton, Dark Energy Survey/DOE/FNAL/NOIRLab/NSF/AURA Acknowledgement: L. Shatz, CC BY 4.0 | |
| NGC 1356, LEDA 467699 (r.o.), LEDA 95415 (r.m.) & IC 1947, kombinierte Aufnahmen durch des Hubble-Weltraumteleskop und Víctor M. Blanco Telescope | |
| AladinLite | |
| Sternbild | Pendeluhr |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 03h 30m 40,8s[1] |
| Deklination | −50° 18′ 35″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | SAB(r)bc[1] |
| Helligkeit (visuell) | 13,0 mag[2] |
| Helligkeit (B-Band) | 13,7 mag[2] |
| Winkelausdehnung | 1,7′ × 0,9′[2] |
| Positionswinkel | 173°[2] |
| Flächenhelligkeit | 13,3 mag/arcmin²[2] |
| Physikalische Daten | |
| Rotverschiebung | 0,039337 ± 0,000050[1] |
| Radialgeschwindigkeit | (11.793 ± 15) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (520 ± 37) · 106 Lj (159,5 ± 11,2) Mpc [1] |
| Durchmesser | 260.000 Lj[3] |
| Geschichte | |
| Entdeckung | John Herschel |
| Entdeckungsdatum | 23. Dezember 1837 |
| Katalogbezeichnungen | |
| NGC 1356 • PGC 13035 • ESO 200-031 • IRAS 03291-5028 • 2MASX J03304076-5018346 • SGC 032911-5028.7 • AM 0329-502 NED01 • | |
NGC 1356 ist eine Balken-Spiralgalaxie vom Hubble-Typ SBbc im Sternbild Horologium am Südsternhimmel. Sie ist schätzungsweise 520 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 260.000 Lj. Im selben Himmelsareal befinden sich die Galaxien IC 1947, IC 1950, IC 1959, IC 1968.
Das Objekt wurde am 23. Dezember 1837 von John Herschel entdeckt.[4]
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(c) Credit:
ESA/Hubble & NASA, J. Dalcanton, Dark Energy Survey/DOE/FNAL/NOIRLab/NSF/AURA
Acknowledgement: L. Shatz, CC BY 4.0It’s all relative
This Hubble Picture of the Week features a richness of spiral galaxies: the large, prominent spiral galaxy on the right side of the image is NGC 1356; the two apparently smaller spiral galaxies flanking it are LEDA 467699 (above it) and LEDA 95415 (very close at its left) respectively; and finally, IC 1947 sits along the left side of the image.
ThIs image is a really interesting example of how challenging it can be to tell whether two galaxies are actually close together, or just seem to be from our perspective here on Earth. A quick glance at this image would likely lead you to think that NGC 1356, LEDA 467699 and LEDA 95415 were all close companions, whilst IC 1947 was more remote. However, we have to remember that two-dimensional images such as this one only give an indication of angular separation: that is, how objects are spread across the sphere of the night sky. What they cannot represent is the distance objects are from Earth.
For instance, whilst NGC 1356 and LEDA 95415 appear to be so close that they must surely be interacting, the former is about 550 million light-years from Earth and the latter is roughly 840 million light-years away, so there is nearly a whopping 300 million light-year separation between them. That also means that LEDA 95415 is likely nowhere near as much smaller than NGC 1356 as it appears to be.
On the other hand, whilst NGC 1356 and IC 1947 seem to be separated by a relative gulf in this image, IC 1947 is only about 500 million light-years from Earth. The angular distance apparent between them in this image only works out to less than four hundred thousand light-years, so they are actually much much closer neighbours in three-dimensional space than NGC 1356 and LEDA 95415!
[Image Description: A collection of galaxies. On the left side a large spiral galaxy with swirling, twisted arms is flanked by a smaller, but still detailed, spiral behind its arm on the left, and a smaller spiral above it. On the right side is a fourth, round spiral galaxy seen face-on. Between them lies a single bright star. Several stars and distant galaxies dot the background.]
Credit:
ESA/Hubble & NASA, J. Dalcanton, Dark Energy Survey/DOE/FNAL/NOIRLab/NSF/AURA
Acknowledgement: L. Shatz
Coordinates Position (RA): 3 30 36.99 Position (Dec): -50° 19' 7.14" Field of view: 3.35 x 3.09 arcminutes Orientation: North is 115.5° right of vertical
Colours & filters Band Wavelength Telescope Optical g 474 nm Víctor M. Blanco 4-meter Telescope DECam Optical r 644 nm Víctor M. Blanco 4-meter Telescope DECam Optical z 919 nm Víctor M. Blanco 4-meter Telescope DECam Optical V 606 nm Hubble Space Telescope ACS.