![]() Merak in Ursa Major. |
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Observation data Epoch J2000.0 Equinox J2000.0 |
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Constellation | Ursa Major |
Right ascension | 11 |
Declination | +56° 22′ 56.7339″ |
Apparent magnitude (V) | +2.37 |
Characteristics | |
Spectral type | A1 V |
U−B color index | +0.00 |
B−V color index | -0.02 |
Variable type | Suspected |
Astrometry | |
Radial velocity (Rv) | -12.0 km/s |
Proper motion (μ) | RA: +81.43 mas/yr |
Parallax (π) | 40.90 ± 0.16mas |
Distance | 79.7 ± 0.3 ly (24.45 ± 0.10 pc) |
Details | |
Mass | 2.7M☉ |
Radius | 3.021 ± 0.038R☉ |
Luminosity | 63.015 ± 1.307L☉ |
Surface gravity (log g) | 3.83 |
Temperature | 9377 ± 75K |
Rotational velocity (v sin i) | 46 km/s |
Age | 500 ± 100Myr |
Other designations | |
Merak, Mirak,
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