NGC 4496
| Galaxie NGC 4496 | |
|---|---|
 (c) Credit: ESA/Hubble & NASA, J. Dalcanton, Dark Energy Survey/DOE/FNAL/DECam/CTIO/NOIRLab/NSF/AURA, CC BY 4.0 | |
| Die Galaxie NGC 4496 bzw. NGC 4496A (oben) und die Galaxie NGC 4496B (unten) aufgenommen mit dem Hubble-Weltraumteleskop. | |
| AladinLite | |
| Sternbild | Jungfrau |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 12h 31m 40,0s[1] |
| Deklination | +03° 55′ 58″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | A: SB(rs)m / HII B: IB(s)m[1] |
| Helligkeit (visuell) | A: 11,2 mag B: 13,9 mag[2] |
| Helligkeit (B-Band) | A: 11,9 mag B: 14,5 mag[2] |
| Winkelausdehnung | A: 3.9 / 3.1 B: 0.8/0.6[2] |
| Positionswinkel | A: 70° B: 102°[2] |
| Flächenhelligkeit | A: 13,8 mag/arcmin² B: 13,0 mag/arcmin²[2] |
| Physikalische Daten | |
| Rotverschiebung | 0.005774 ±0.000255[1] |
| Radialgeschwindigkeit | (1731 ±76) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (74 ± 5) · 106 Lj (22,6 ± 1,6) Mpc [1] |
| Geschichte | |
| Entdeckung | William Herschel |
| Entdeckungsdatum | 23. Februar 1784 |
| Katalogbezeichnungen | |
| NGC 4496, 4505 • UGC 7668 • PGC 41471 • CGCG 042-144 • MCG +01-32-090 • IRAS 12291+0412 • VCC 1375 • VV 76 • GC 3045/3055 • H II 36/III 18 • h 1309/1315 • KCPG 343A | |
NGC 4496 = NGC 4505 ist ein Galaxienpaar im Sternbild Jungfrau auf der Ekliptik, das im New General Catalogue verzeichnet ist. Zur besseren Unterscheidung sind die beiden Galaxien auch mit NGC 4496A (Balkenspiralgalaxie vom Hubble-Typ SBc) und NGC 4496B (irreguläre Galaxie vom Hubble-Typ IBm) bezeichnet, da sie sich in ihrer Entfernung deutlich unterscheiden (74 Millionen Lichtjahre bzw. 199 Millionen Lichtjahre). Die Bezeichnungen NGC 4496 und NGC 4496A werden dabei synonym verwendet.
Das Galaxienpaar wurde im Jahr 1784 von dem deutsch-britischen Astronomen William Herschel mithilfe seines 18,7 Zoll-Spiegelteleskops entdeckt.[3]
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NGC4496 Potw2209a.jpg
(c) Credit: ESA/Hubble & NASA, J. Dalcanton, Dark Energy Survey/DOE/FNAL/DECam/CTIO/NOIRLab/NSF/AURA, CC BY 4.0
The twin galaxies NGC 4496A and NGC 4496B dominate the frame in this image from the NASA/ESA Hubble Space Telescope. Both galaxies lie in the constellation Virgo, but despite appearing side-by-side in this image they are at vastly different distances from both Earth and one another. NGC 4496A is 47 million light-years from Earth while NGC 4496B is 212 million light-years away. The enormous distances between the two galaxies mean that the two cannot interact, and they only appear to overlap owing to a chance alignment. Chance galactic alignments such as this provide astronomers with the opportunity to delve into the distribution of dust in these galaxies. Galactic dust adds to the beauty of astronomical images — it can be seen in this image as the dark tendrils threading through both NGC 4496A and NGC 4496B —but it also complicates astronomers’ observations. Dust absorbs starlight, making stars seem dimmer and shifting their light towards longer wavelengths, a process that astronomers refer to as “reddening” (not the same thing as redshift). By carefully measuring how starlight from background galaxies is affected by dust in intervening galaxies, astronomers can map out where the dust is in the foreground galaxy’s spiral arms. The resulting “dust maps” help astronomers calibrate measurements of everything from cosmological distances to the types of stars populating galaxies.
(c) Credit: ESA/Hubble & NASA, J. Dalcanton, Dark Energy Survey/DOE/FNAL/DECam/CTIO/NOIRLab/NSF/AURA, CC BY 4.0
The twin galaxies NGC 4496A and NGC 4496B dominate the frame in this image from the NASA/ESA Hubble Space Telescope. Both galaxies lie in the constellation Virgo, but despite appearing side-by-side in this image they are at vastly different distances from both Earth and one another. NGC 4496A is 47 million light-years from Earth while NGC 4496B is 212 million light-years away. The enormous distances between the two galaxies mean that the two cannot interact, and they only appear to overlap owing to a chance alignment. Chance galactic alignments such as this provide astronomers with the opportunity to delve into the distribution of dust in these galaxies. Galactic dust adds to the beauty of astronomical images — it can be seen in this image as the dark tendrils threading through both NGC 4496A and NGC 4496B —but it also complicates astronomers’ observations. Dust absorbs starlight, making stars seem dimmer and shifting their light towards longer wavelengths, a process that astronomers refer to as “reddening” (not the same thing as redshift). By carefully measuring how starlight from background galaxies is affected by dust in intervening galaxies, astronomers can map out where the dust is in the foreground galaxy’s spiral arms. The resulting “dust maps” help astronomers calibrate measurements of everything from cosmological distances to the types of stars populating galaxies.
Coordinates Position (RA): 12 31 39.34 Position (Dec): 3° 55' 41.10" Field of view: 2.61 x 2.63 arcminutes Orientation: North is 3.8° left of vertical
Colours & filters Band Wavelength Telescope Optical u 354 nm SDSS Optical G 474 nm Víctor M. Blanco 4-meter Telescope DECam Optical G 477 nm SDSS Optical R 623 nm SDSS Optical R 644 nm Víctor M. Blanco 4-meter Telescope DECam Optical I 762 nm SDSS Optical Z 913 nm SDSS Optical Z 919 nm Víctor M. Blanco 4-meter Telescope DECam Optical V 606 nm Hubble Space Telescope WFC3.