NGC 976
| Galaxie NGC 976 | |
|---|---|
 (c) Credit: ESA/Hubble & NASA, D. Jones, A. Riess et al., CC BY 4.0 | |
| Aufnahme mithilfe des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Widder |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 02h 34m 00,0s [1] |
| Deklination | +20° 58′ 36″ [1] |
| Erscheinungsbild | |
| Morphologischer Typ | SA(rs)c:[1] |
| Helligkeit (visuell) | 12,5 mag[2] |
| Helligkeit (B-Band) | 13,3 mag[2] |
| Winkelausdehnung | 1,6′ × 1,3′[2] |
| Positionswinkel | 162°[2] |
| Flächenhelligkeit | 13,1 mag/arcmin²[2] |
| Physikalische Daten | |
| Zugehörigkeit | LGG 61[1][3] |
| Rotverschiebung | 0,014330 ± 0,000002[1] |
| Radialgeschwindigkeit | (4296 ± 1) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (195 ± 14) · 106 Lj (59,9 ± 4,2) Mpc [1] |
| Durchmesser | 90.000 Lj[4] |
| Geschichte | |
| Entdeckung | Ernst Leberecht Tempel |
| Entdeckungsdatum | 1876 |
| Katalogbezeichnungen | |
| NGC 976 • UGC 2042 • PGC 9776 • CGCG 462-27 • MCG +03-07-027 • IRAS 02311+2045 • 2MASX J02340001+2058364 • GALEXASC J023359.96+205835.5 • LDCE 168 NED009 | |
NGC 976 ist eine Spiralgalaxie vom Hubble-Typ Sbc im Sternbild Widder auf der Ekliptik. Sie ist schätzungsweise 195 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 90.000 Lichtjahren.
Im selben Himmelsareal befinden sich die Galaxien NGC 992 und IC 235.
Die Typ-Ia/P-Supernova SN 1999dq wurde hier beobachtet.[5]
Das Objekt wurde im Jahr 1876 von Ernst Wilhelm Leberecht Tempel entdeckt.[6]
NGC 976-Gruppe (LGG 61)
| Galaxie | Alternativname | Mio. Lj |
|---|---|---|
| NGC 924 | PGC 9302 | 203 |
| NGC 932 | PGC 9379 | 186 |
| NGC 976 | PGC 9776 | 195 |
| NGC 935 | PGC 9388 | 189 |
| NGC 938 | PGC 9423 | 188 |
| IC 1797 | PGC 9205 | 188 |
| IC 1801 | PGC 9392 | 183 |
| PGC 9475 | UGC 1965 | 189 |
| PGC 9738 | UGC 2032 | 197 |
| PGC 9828 | UGC 2064 | 194 |
| PGC 9313 | MCG +3-7-13 | 192 |
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(c) Credit: ESA/Hubble & NASA, D. Jones, A. Riess et al., CC BY 4.0
Galactic Tranquility
The lazily winding spiral arms of the spectacular galaxy NGC 976 fill the frame of this image from the NASA/ESA Hubble Space Telescope. This spiral galaxy lies around 150 million light-years from the Milky Way in the constellation Aries. Despite its tranquil appearance, NGC 976 has played host to one of the most violent astronomical phenomena known — a supernova explosion. These cataclysmicly violent events take place at the end of the lives of massive stars, and can outshine entire galaxies for a short period. While supernovae mark the deaths of massive stars, they are also responsible for the creation of heavy elements that are incorporated into later generations of stars and planets.
Supernovae are also a useful aid for astronomers who measure the distances to faraway galaxies. The amount of energy thrown out into space by supernova explosions is very uniform, allowing astronomers to estimate their distances from how bright they appear to be when viewed from Earth. This image — which was created using data from Hubble’s Wide Field Camera 3 — comes from a large collection of Hubble observations of nearby galaxies which host supernovae as well as a pulsating class of stars known as Cepheid variables. Both Cepheids and supernovae are used to measure astronomical distances, and galaxies containing both objects provide useful natural laboratories where the two methods can be calibrated against one another.
Credit:
ESA/Hubble & NASA, D. Jones, A. Riess et al.