Alrisha (α Psc / α Piscium / Alpha Pisces / Al-Risha / Al-Resha) is a double star in the constellation Pisces . The name of the star comes from the Arabic الرشآء al-rišā ', which means "rope, rope." Despite the fact that Alrisha is called Alpha of Pisces, she is only the third most brilliant in the constellation. The distance to α Pisces is 139 light years . The spectral class A0p and A3m for component B. The main star has a visible magnitude of +4.33, α Pisces B - +5.23. The masses of both stars are respectively 2.3 and 1.8 solar masses , the radius exceeds the solar by 2 and 1.5 times, respectively. The period of revolution around the common center of mass is 720 years.
| Alrisha A / B | |||
|---|---|---|---|
| Star | |||
 Pisces constellation map | |||
| Observational data ( Age J2000.0) | |||
| Right ascension | |||
| Declination | |||
| Distance | 139 St. years (42.6 pc ) | ||
| Visible magnitude ( V ) | from 3.82 to +3.83 | ||
| Constellation | Fish | ||
| Astrometry | |||
| Radial velocity ( R v ) | +7.5 km / s | ||
| Own movement (μ) | RA: +41.85 mas per year Dec: -11.00 mas per year | ||
| Parallax (π) | 23.45 ± 1.06 mas | ||
| Absolute magnitude (V) | from +0.67 to +0.68 | ||
| Specifications | |||
| Spectral class | A0p / A3m | ||
| Color Index ( B - V ) | -0.04 | ||
| Variability | maybe ACV | ||
| physical characteristics | |||
| Weight | 2.3 / 1.8 M ☉ | ||
| Radius | 2.05 / 1.56 R ☉ | ||
| Temperature | 9500/8600 K | ||
| Luminosity | 31/12 L ☉ | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
Notes
Links
- Alrisha . alcyone.de. Date of treatment October 30, 2013.