NGC 3021
| Galaxie NGC 3021 | |
|---|---|
 (c) ESA/Hubble, CC BY 4.0 | |
| Aufnahme mit dem Hubble-Weltraumteleskop | |
| AladinLite | |
| Sternbild | Kleiner Löwe |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 09h 50m 57,1s[1] |
| Deklination | +33° 33′ 13″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | SA(rs)bc:[1] |
| Helligkeit (visuell) | 12,2 mag[2] |
| Helligkeit (B-Band) | 13,0 mag[2] |
| Winkelausdehnung | 1,5′ × 0,9′[2] |
| Positionswinkel | 110°[2] |
| Flächenhelligkeit | 12,4 mag/arcmin²[2] |
| Physikalische Daten | |
| Zugehörigkeit | LDCE 676[1] |
| Rotverschiebung | 0,005120 ± 0,000009[1] |
| Radialgeschwindigkeit | (1535 ± 3) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (67 ± 5) · 106 Lj (20,6 ± 1,4) Mpc [1] |
| Durchmesser | 30.0000 Lj[3] |
| Geschichte | |
| Entdeckung | William Herschel |
| Entdeckungsdatum | 7. Dezember 1785 |
| Katalogbezeichnungen | |
| NGC 3021 • UGC 5280 • PGC 28357 • CGCG 182-25 • MCG +06-22-019 • IRAS 09479+3347 • KUG 0947+337 • 2MASX J09505711+3333124 • GC 1944 • H I 115 • h 645 • KTG 26B | |
NGC 3021 ist eine Spiralgalaxie vom Hubble-Typ Sbc im Sternbild Kleiner Löwe am Nordsternhimmel. Sie ist schätzungsweise 68 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 30.000 Lichtjahren. Gemeinsam mit NGC 3003 und NGC 3067 bildet sich das isolierte Galaxientrio KTG 26.
Im selben Himmelsareal befinden sich u. a. die Galaxien NGC 3013 und IC 2508.
Die Typ-Ia-Supernova SN 1995al wurde hier beobachtet.[4]
Das Objekt wurde am 7. Dezember 1785 von William Herschel entdeckt.[5]
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A cosmological measuring tape.jpg
(c) ESA/Hubble, CC BY 4.0
This NASA/ESA Hubble Space Telescope image shows the spiral galaxy NGC 3021 which lies about 100 million light-years away in the constellation of Leo Minor (The Little Lion). Among many other types of stars, this galaxy contains Cepheid variable stars, which can be used work out the distance to the galaxy. These stars pulsate at a rate that is closely related to their intrinsic brightness, so measurements of their rate of pulsation and their observed brightness give astronomers enough information to calculate the distance to the galaxy itself. Cepheids are also used to calibrate an even brighter distance marker, that can be used over greater distances: Type Ia supernovae. One of these bright exploding stars was observed in NGC 3021, back in 1995. In addition, the supernova in NGC 3021 was also used to refine the measurement of what is known as the Hubble constant. The value of this constant defines how fast the Universe is expanding and the more accurately we know it the more we can understand about the evolution of the Universe in the past as well as in the future. So, there is much more to this galaxy than just a pretty spiral.
(c) ESA/Hubble, CC BY 4.0
This NASA/ESA Hubble Space Telescope image shows the spiral galaxy NGC 3021 which lies about 100 million light-years away in the constellation of Leo Minor (The Little Lion). Among many other types of stars, this galaxy contains Cepheid variable stars, which can be used work out the distance to the galaxy. These stars pulsate at a rate that is closely related to their intrinsic brightness, so measurements of their rate of pulsation and their observed brightness give astronomers enough information to calculate the distance to the galaxy itself. Cepheids are also used to calibrate an even brighter distance marker, that can be used over greater distances: Type Ia supernovae. One of these bright exploding stars was observed in NGC 3021, back in 1995. In addition, the supernova in NGC 3021 was also used to refine the measurement of what is known as the Hubble constant. The value of this constant defines how fast the Universe is expanding and the more accurately we know it the more we can understand about the evolution of the Universe in the past as well as in the future. So, there is much more to this galaxy than just a pretty spiral.