NGC 3156
| Galaxie NGC 3156 | |
|---|---|
.jpg) (c) ESA/Hubble, CC BY 4.0 | |
| Aufnahme des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Sextant |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 10h 12m 41,249s[1] |
| Deklination | +03° 07′ 45,69″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | S0[1] |
| Helligkeit (visuell) | 12,1 mag[2] |
| Helligkeit (B-Band) | 13,1 mag[2] |
| Winkelausdehnung | 1,9' × 0,9'[2] |
| Positionswinkel | 47°[2] |
| Flächenhelligkeit | 12,6 mag/arcmin²[2] |
| Physikalische Daten | |
| Zugehörigkeit | NGC 3169-Gruppe LGG 192[1][3] |
| Rotverschiebung | 0.004463 ± 0.000017[1] |
| Radialgeschwindigkeit | (1338 ± 5) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (53 ± 4) · 106 Lj (16,4 ± 1,2) Mpc [1] |
| Durchmesser | 30.000 Lj[4] |
| Geschichte | |
| Entdeckung | William Herschel |
| Entdeckungsdatum | 13. Dezember 1784 |
| Katalogbezeichnungen | |
| NGC 3156 • UGC 5503 • PGC 29730 • CGCG 036-057 • MCG +01-26-019 • 2MASX J10124120+0307455 • GC 2028 • H III 255 • h 680 • GALEXASC J101241.30+030746.8 • LDCE 715 NED001 • WISEA J101241.26+030745.7 | |
NGC 3156 ist eine Linsenförmige Galaxie vom Hubble-Typ S0 im Sternbild Sextant am Südsternhimmel. Sie ist schätzungsweise 53 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 30.000 Lichtjahren. Die Galaxie gilt als Mitglied der fünf Galaxien zählenden NGC 3169-Gruppe (LGG 192).
Im selben Himmelsareal befinden sich u. a. die Galaxien NGC 3165 und NGC 3166.
Das Objekt wurde am 13. Dezember 1784 von William Herschel entdeckt.[5]
Weblinks
Commons: NGC 3156 – Sammlung von Bildern, Videos und Audiodateien
Einzelnachweise
Auf dieser Seite verwendete Medien
NGC3156 - Measure of a great galactic disc (potw2337a).jpg
(c) ESA/Hubble, CC BY 4.0
This dream-like Picture of the Week features the galaxy known as NGC 3156. It is a lenticular galaxy, meaning that it falls somewhere between an elliptical and a spiral galaxy. It lies about 73 million light-years from Earth, in the minor equatorial constellation Sextans. Sextans is a small constellation that belongs to the Hercules family of constellations. It itself is a constellation with an astronomical theme, being named for the instrument known as the sextant. Sextants are often thought of as navigational instruments that were invented in the 18th century. However, the sextant as an astronomical tool has been around for much longer than that: Islamic scholars developed astronomical sextants many hundreds of years earlier in order to measure angles in the sky. A particularly striking example is the enormous sextant with a radius of 36 metres that was developed by Ulugh Beg of the Timurid dynasty in the fifteenth century, located in Samarkand in present-day Uzbekistan. These early sextants may have been a development of the quadrant, a measuring device proposed by Ptolemy. A sextant, as the name suggests, is shaped like one-sixth of a circle, approximately the shape of the constellation.Sextants are no longer in use in modern astronomy, having been replaced by instruments that are capable of measuring the positions of stars and astronomical objects much more accurately and precisely. NGC 3156 has been studied in many ways other than determining its precise position — from its cohort of globular clusters, to its relatively recent star formation, to the stars that are being destroyed by the supermassive black hole at its centre.[Image Description: A large elliptical galaxy. It appears to be formed of faint, grey, concentric ovals that grow progressively brighter towards the core, where there is a very bright point, and fade away at the edge. Two threads of dark red dust cross the galaxy’s disc, near the centre. The background is black and mostly empty, with only a few point stars and small galaxies.]
(c) ESA/Hubble, CC BY 4.0
This dream-like Picture of the Week features the galaxy known as NGC 3156. It is a lenticular galaxy, meaning that it falls somewhere between an elliptical and a spiral galaxy. It lies about 73 million light-years from Earth, in the minor equatorial constellation Sextans. Sextans is a small constellation that belongs to the Hercules family of constellations. It itself is a constellation with an astronomical theme, being named for the instrument known as the sextant. Sextants are often thought of as navigational instruments that were invented in the 18th century. However, the sextant as an astronomical tool has been around for much longer than that: Islamic scholars developed astronomical sextants many hundreds of years earlier in order to measure angles in the sky. A particularly striking example is the enormous sextant with a radius of 36 metres that was developed by Ulugh Beg of the Timurid dynasty in the fifteenth century, located in Samarkand in present-day Uzbekistan. These early sextants may have been a development of the quadrant, a measuring device proposed by Ptolemy. A sextant, as the name suggests, is shaped like one-sixth of a circle, approximately the shape of the constellation.Sextants are no longer in use in modern astronomy, having been replaced by instruments that are capable of measuring the positions of stars and astronomical objects much more accurately and precisely. NGC 3156 has been studied in many ways other than determining its precise position — from its cohort of globular clusters, to its relatively recent star formation, to the stars that are being destroyed by the supermassive black hole at its centre.[Image Description: A large elliptical galaxy. It appears to be formed of faint, grey, concentric ovals that grow progressively brighter towards the core, where there is a very bright point, and fade away at the edge. Two threads of dark red dust cross the galaxy’s disc, near the centre. The background is black and mostly empty, with only a few point stars and small galaxies.]