Delta Ursae Minoris
Star in the constellation Ursa Minor / From Wikipedia, the free encyclopedia
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Delta Ursae Minoris, Latinized from δ Ursae Minoris, formally named Yildun /jɪlˈdʌn/,[11] is a white-hued star in the northern circumpolar constellation of Ursa Minor, forming the second star in the bear's tail.[12] It is visible to the naked eye with an apparent visual magnitude of 4.36.[3] Based upon an annual parallax shift of 18.95 mas as seen from Earth,[2] it is located 172 light years from the Sun. The star is moving closer to the Sun with a radial velocity of about −8 km/s.[5]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ursa Minor[1] |
Right ascension | 17h 32m 12.99671s[2] |
Declination | 86° 35′ 11.2584″[2] |
Apparent magnitude (V) | 4.36[3] |
Characteristics | |
Spectral type | A1 Van[4] |
U−B color index | +0.03[3] |
B−V color index | +0.02[3] |
Astrometry | |
Radial velocity (Rv) | −7.6±2.7[5] km/s |
Proper motion (μ) | RA: +10.17[2] mas/yr Dec.: +53.97[2] mas/yr |
Parallax (π) | 18.95 ± 0.14 mas[2] |
Distance | 172 ± 1 ly (52.8 ± 0.4 pc) |
Absolute magnitude (MV) | 0.62[6] |
Details | |
Mass | 2.35[7] M☉ |
Radius | 2.8[1] R☉ |
Luminosity | 47.77[8] L☉ |
Surface gravity (log g) | 4.04[7] cgs |
Temperature | 9,911±337[7] K |
Rotation | 19 hours[1] |
Rotational velocity (v sin i) | 154[7] km/s |
Age | 327[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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