Hamal
| Stern Hamal (Alpha Arietis) | |||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AladinLite | |||||||||||||||||||||||
| Beobachtungsdaten Äquinoktium: J2000.0, Epoche: J2000.0 | |||||||||||||||||||||||
| Sternbild | Widder | ||||||||||||||||||||||
| Rektaszension | 02h 07m 10,407s [1] | ||||||||||||||||||||||
| Deklination | +23° 27′ 44,72″ [1] | ||||||||||||||||||||||
| Helligkeiten | |||||||||||||||||||||||
| Scheinbare Helligkeit | 2,01 mag[1] | ||||||||||||||||||||||
| Spektrum und Indices | |||||||||||||||||||||||
| B−V-Farbindex | +1,15[2] | ||||||||||||||||||||||
| U−B-Farbindex | +1,12[2] | ||||||||||||||||||||||
| R−I-Index | +0,62[2] | ||||||||||||||||||||||
| Spektralklasse | K2 III[1] | ||||||||||||||||||||||
| Astrometrie | |||||||||||||||||||||||
| Radialgeschwindigkeit | (−14,6 ± 0,1) km/s[3] | ||||||||||||||||||||||
| Parallaxe | (49,56 ± 0,25) mas[4] | ||||||||||||||||||||||
| Entfernung | (65,8 ± 0,3) Lj (20,2 ± 0,1) pc [4] | ||||||||||||||||||||||
| Visuelle Absolute Helligkeit Mvis | +0,5 mag[Anm 1] | ||||||||||||||||||||||
| Eigenbewegung[4] | |||||||||||||||||||||||
| Rek.-Anteil: | (+188,55 ± 0,31) mas/a | ||||||||||||||||||||||
| Dekl.-Anteil: | (−148,08 ± 0,19) mas/a | ||||||||||||||||||||||
| Physikalische Eigenschaften | |||||||||||||||||||||||
| Andere Bezeichnungen und Katalogeinträge | |||||||||||||||||||||||
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| Anmerkung | |||||||||||||||||||||||
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Hamal (auch Hamel[5], arabisch الحمل, DMG al-ḥamal ‚Lamm‘), sowie lateinisch Alpha Arietis (kurz α Arietis) genannt, ist ein K2-Riese im Sternbild Widder. Mit einer scheinbaren visuellen Helligkeit von etwa 2,0 mag ist er der hellste Stern in diesem Sternbild. Hamal ist von der Erde 65,8 Lichtjahre entfernt und hat einen Durchmesser, der 14 mal größer als der der Sonne ist.
Siehe auch
Weblinks
Einzelnachweise
- ↑ a b c Hipparcos-Katalog (ESA 1997)
- ↑ a b c Bright Star Catalogue
- ↑ Pulkovo radial velocities for 35493 HIP stars
- ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
- ↑ Der Bau des Universums - Vom Atom zum Spiralnebel, Peter von der Osten-Sacken, Büchergilde Gutenberg, FfM, 1971, ISBN 3 7632 1648 0
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