Pi Aurigae
 The location of π Aurigae (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 59m 56.0994s[1] |
| Declination | +45° 56′ 12.248″[1] |
| Apparent magnitude (V) | 4.25[2] |
| Characteristics | |
| Spectral type | M3 II[3] |
| U−B color index | +1.83[2] |
| B−V color index | +1.72[2] |
| R−I color index | 1.48 |
| Variable type | LC[4] |
| Astrometry | |
| Radial velocity (Rv) | 0.71 ± 0.76[5] km/s |
| Proper motion (μ) | RA: -2.42[1] mas/yr Dec.: -7.32[1] mas/yr |
| Parallax (π) | 3.88 ± 0.85[1] mas |
| Distance | approx. 800 ly (approx. 260 pc) |
| Details | |
| Mass | 5.0 M☉ |
| Radius | 265[6] R☉ |
| Luminosity | 9590 L☉ |
| Temperature | 3530 K |
| Age | 70-100 Myr |
| Other designations | |
Pi Aurigae (π Aur, π Aurigae) is the Bayer designation for a star in the northern constellation of Auriga. Located about one degree north of the 2nd magnitude star Beta Aurigae,[8] Pi Aurigae is visible to the naked eye with an apparent visual magnitude of 4.25[2] Based upon parallax measurements, it is approximately 800 light-years (250 parsecs) away from Earth.[1] At that distance, the brightness of the star is diminished by 0.54 in magnitude from extinction caused by interstellar gas and dust.[5]
Pi Aurigae is a bright giant star with a stellar classification of M3 II.[3] The measured angular diameter of this star, after correction for limb darkening, is 9.56 ± 0.10 mas.[9] At the estimated distance of Pi Aurigae,[1] this yields a physical size of about 265 times the radius of the Sun.[6] It is classified as an slow irregular variable of type LC and its brightness varies from magnitude +4.24 to +4.34.[4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Lua error in package.lua at line 80: module 'strict' not found. Note: see VizieR catalogue I/311.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found. The radius (R*) is given by:
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
