Pi Arietis
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aries |
| Right ascension | 02h 49m 17.5599s |
| Declination | +17° 27′ 51.512″ |
| Apparent magnitude (V) | 5.314 |
| Characteristics | |
| Spectral type | B6V |
| U-B color index | -0.47 |
| B-V color index | -0.06 |
| Astrometry | |
| Radial velocity (Rv) | 8.8 km/s |
| Proper motion (μ) | RA: 3.65 mas/yr Dec.: -14.61 mas/yr |
| Parallax (π) | 5.41 ± 1.06 mas |
| Distance | approx. 600 ly (approx. 180 pc) |
| Absolute magnitude (MV) | 5.226 |
| Details | |
| Mass | 18 M☉ |
| Radius | 7 R☉ |
| Luminosity | 20,000 L☉ |
| Temperature | 10,000–30,000 K |
| Orbit | |
| Companion | ADS 2151 B |
| Semimajor axis (a) | 3,2" |
| Inclination (i) | 119° |
| Orbit | |
| Companion | ADS 2151 C |
| Semimajor axis (a) | 25,2" |
| Inclination (i) | 110° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
| Database references | |
| SIMBAD | data |
Pi Arietis (π Ari / π Arietis) is a star system in the constellation Aries. It is approximately 603 light years from Earth.
The primary component, π Arietis A, is a spectroscopic binary which is classified as a blue-white B-type main sequence dwarf with an apparent magnitude of +5.26. Its two components have an orbital period of 3.85 days and are separated by approximately 0.00004 arcseconds. At 3.2 arcseconds from the binary is π Arietis B, which is a white A-type main sequence star with an apparent magnitude of 8.8. It is probably an optical companion. At 25.2 arcseconds from A is π Arietis C, which is a magnitude +10.9 yellow-white F-type main sequence star.
[edit] External links
[edit] Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Spectral type | Database references |
|---|---|---|---|---|---|
| ADS 2151 B (SV* ZI 154) | 02h 49m 17.5599s | +17° 27' 51.512 | 5.314 | B6V | Simbad |
| ADS 2151 C (BD+16 355B) | 02h 49m 18 s | +17° 27' 00 | 8.8 | A0Vp | Simbad |
| ADS 2151 D (BD+16 355C) | 02h 49m 19.0s | +17° 27' 43 | 10.72 | F8V | Simbad |
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