  | |||
| Beobachtungsdaten Epoche J2000.0 Equinox J2000.0 (ICRS) | |||
|---|---|---|---|
| Constellation | Stier | ||
| σ 1 Tau | |||
| Aufstieg nach rechts | 04 h 39 m 09.22247 s [1] | ||
| Deklination [1] | |||
| Deklination [1] | |||
| ° 47 ′ 59.5345 ″ [1] | |||
| Scheinbare Größe (V) | 5.07 | ||
| σ 2 Tau | |||
| Right aufsteigend [19659011] 04 h 39 m 16.50230 s [1] | |||
| Deklination | + 15 ° 55 ′ 04.7029 ″ [1] | ||
| (19659021) (19456523) (1945) ] | 4.70 [3] | ||
| Eigenschaften | |||
| σ 1 Tau | |||
| Spektraltyp | A4m [4] | ||
| U-B-Farbindex | 0,190 [2] | ||
| B-V-Farbindex | 0.146 [2] | ||
| σ 2 Tau | |||
| Spektraltyp | A5 Vn [5] | ||
| U-B-Farbindex | +0,13 [3] | ||
| B-V-Farbindex | +0.14 [3] | ||
| Astrometrie | |||
| σ 1 Tau | |||
| Radialgeschwindigkeit (R v ) | +26 ± 10.0 [6] km / s | ||
| Richtige Bewegung (μ) | RA: +41.91 [1] mas / Jahr Dez .: - 66.88 [1] mas / yr | ||
| Parallax (π) | 22.18 ± 0.93 [1] mas | ||
| Abstand | 147 ± 6 ly (45 ± 2 pc) | ||
| Absolute Magnitude (M V ) | 1.73 [2] | ||
| σ 2 Tau | |||
| Radialgeschwindigkeit (R v ) 19659041] 7001408000000000000 1945 +40.8 ± 1.2 [6] km / s | |||
| Richtige Bewegung (μ) | RA: +83.17 [1] mas / yr Dez .: -20.97 [1] mas / a. | ||
| Parallax (π) | 20.97 ± 0.27 [1] mas | ||
| Abstand | |||
| Abstand [19] 659052] 156 ± 2 ly (47,7 ± 0,6 Stck.) | |||
| Orbit [7] | |||
| Primary | σ 1 Tau A | ||
| Companion | σ Tau B | ||
| Zeitraum (P) | 38.951 d | ||
| Exzentrizität (e) | 0.15 | ||
| Länge des Knotens (Ω) | 82 ° | ||
| Periastron-Epoche (T) | 2443094.319 JD | ||
| Semiamplitude (K 1 ) (19659085) (19659085) 7,9 km / s | |||
| ] Details | |||
| σ 1 Tau | |||
| Masse | 1.94 [2] M | ||
| Luminosity | 14.7 | 14.7 | L [1945 |
| Oberflächengravitation (log g ) | 4.08 [2] cgs | ||
| Temperatur | 8.470
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