Alsafi
| Stern Alsafi | |||||||||||||||||||||||
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| Bild von Alsafi | |||||||||||||||||||||||
| AladinLite | |||||||||||||||||||||||
| Beobachtungsdaten Äquinoktium: J2000.0, Epoche: J2000.0 | |||||||||||||||||||||||
| Sternbild | Drache | ||||||||||||||||||||||
| Rektaszension | 19h 32m 21,591s [1] | ||||||||||||||||||||||
| Deklination | +69° 39′ 40,23″ [1] | ||||||||||||||||||||||
| Helligkeiten | |||||||||||||||||||||||
| Scheinbare Helligkeit | 4,67 mag[1] | ||||||||||||||||||||||
| Spektrum und Indices | |||||||||||||||||||||||
| B−V-Farbindex | +0,79[2] | ||||||||||||||||||||||
| U−B-Farbindex | +0,38[2] | ||||||||||||||||||||||
| R−I-Index | +0,41[2] | ||||||||||||||||||||||
| Spektralklasse | G9 V[3] | ||||||||||||||||||||||
| Astrometrie | |||||||||||||||||||||||
| Radialgeschwindigkeit | 26,73 ± 0,01 km/s[4] | ||||||||||||||||||||||
| Parallaxe | (173,77 ± 0,18) mas[5] | ||||||||||||||||||||||
| Entfernung | (18,77 ± 0,02) Lj (5,755 ± 0,006) pc [5] | ||||||||||||||||||||||
| Eigenbewegung[5] | |||||||||||||||||||||||
| Rek.-Anteil: | (+598,07 ± 0,17) mas/a | ||||||||||||||||||||||
| Dekl.-Anteil: | (−1738,40 ± 0,19) mas/a | ||||||||||||||||||||||
| Physikalische Eigenschaften | |||||||||||||||||||||||
| Masse | 0,8 bis 0,9 M☉[6] | ||||||||||||||||||||||
| Radius | 0,77 R☉[6] | ||||||||||||||||||||||
| Effektive Temperatur | 5315 K[6] | ||||||||||||||||||||||
| Rotationsdauer | 29 d[6] | ||||||||||||||||||||||
| Alter | 3 Mrd. a[6] | ||||||||||||||||||||||
| Andere Bezeichnungen und Katalogeinträge | |||||||||||||||||||||||
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Alsafi[7], Bayer-Bezeichnung Sigma Draconis(σ Dra), ist ein ca. 19 Lichtjahre entfernter Stern der Spektralklasse G9 V[3] im Sternbild Drache mit einer scheinbaren visuellen Helligkeit von 4,7 mag. Sein historischer Eigenname stammt aus dem Arabischen الأثافي, DMG al-aṯāfī und bedeutet „Dreibein (zum Kochen)“.
Einzelnachweise
- ↑ a b Hipparcos-Katalog (ESA 1997)
- ↑ a b c Bright Star Catalogue
- ↑ a b Henry, Todd J.: The 100 Nearest Star Systems. Abgerufen am 20. Januar 2018 (englisch).
- ↑ sig Dra. In: SIMBAD. Centre de Données astronomiques de Strasbourg, abgerufen am 5. Juni 2022.
- ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
- ↑ a b c d e Jim Kaler: Alsafi. In: STARS. Abgerufen am 5. Juni 2022 (englisch).
- ↑ Naming Stars. IAU, archiviert vom (nicht mehr online verfügbar) am 10. März 2025; abgerufen am 23. August 2020 (englisch).
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