Pi1 Ursae Majoris
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For other stars named Pi UMa, see Pi Ursae Majoris
For other stars named Muscida, see Muscida
| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Ursa Major |
| Right ascension | 08h 39m 11.7s |
| Declination | +65° 01′ 15″ |
| Apparent magnitude (V) | 5.63 |
| Characteristics | |
| Spectral type | G1.5Vb |
| U-B color index | 0.07 |
| B-V color index | 0.62 |
| Variable type | BY Draconis |
| Astrometry | |
| Radial velocity (Rv) | -12.5 km/s |
| Proper motion (μ) | RA: -27.73 mas/yr Dec.: 87.90 mas/yr |
| Parallax (π) | 70.07 ± 0.71 mas |
| Distance | 46.5 ± 0.5 ly (14.3 ± 0.1 pc) |
| Absolute magnitude (MV) | 4.86 |
| Details | |
| Mass | 1.08 M☉ |
| Radius | ? R☉ |
| Luminosity | 0.89 L☉ |
| Temperature | 5,860 K |
| Metallicity | ? |
| Rotation | 4.79 days |
| Age | ? years |
| Other designations | |
pi1 Ursae Majoris is a yellow G-type main sequence dwarf with a mean apparent magnitude of +5.63. It is approximately 46.5 light years from Earth. It is classified as a BY Draconis type variable star and its brightness varies by 0.08 magnitudes. An excess of infrared radiation has been detected from this system, which is indicative of a debris disk.[1]
[edit] References
- ^ Beichman, C. A.; Tanner, A.; Bryden, G.; Stapelfeldt, K. R.; Werner, M. W.; Rieke, G. H.; Trilling, D. E.; Lawler, S.; Gautier, T. N. (2006). "IRS Spectra of Solar-Type Stars: A Search for Asteroid Belt Analogs". The Astrophysical Journal 639: 1166–1176. doi:.
[edit] External links
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