15 Draconis
Star in the constellation Draco
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15 Draconis is a single[8] star in the northern circumpolar constellation of Draco, located 452 light years away from the Sun. 15 Draconis is the Flamsteed designation; it also has the Bayer designation A Draconis.[9] This object is visible to the naked eye as a white-hued star with an apparent visual magnitude of 4.94.[2] It is moving closer to the Earth with a heliocentric radial velocity of â7 km/s.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| Right ascension | 16h 27m 59.01603s[1] |
| Declination | +68° 46â² 05.3051â³[1] |
| Apparent magnitude (V) | 4.94[2] |
| Characteristics | |
| Spectral type | B9.5IV[3] |
| BâV color index | â0.051±0.006[2] |
| Astrometry | |
| Radial velocity (Rv) | â6.7±2.8[2] km/s |
| Proper motion (μ) | RA: â24.818[1] mas/yr Dec.: +33.623[1] mas/yr |
| Parallax (Ï) | 7.2102±0.1296 mas[1] |
| Distance | 452 ± 8 ly (139 ± 2 pc) |
| Absolute magnitude (MV) | â0.93[2] |
| Details | |
| Mass | 2.6[4] Mâ |
| Radius | 4.9[4] Râ |
| Luminosity | 213[4] Lâ |
| Surface gravity (log g) | 3.47[4] cgs |
| Temperature | 9,994[4] K |
| Rotational velocity (v sin i) | 154[5] km/s |
| Age | 306[6] Myr |
| Other designations | |
| A Draconis, 15 Dra, BD+69°850, FK5 619, HD 149212, HIP 80650, HR 6161, SAO 17107[7] | |
| Database references | |
| SIMBAD | data |
This star has a stellar classification of A0 III,[10] matching that of an A-type giant star. It has a relatively high rate of spin with a projected rotational velocity of 154 km/s.[5] The star is radiating 213 times the Sun's luminosity from its photosphere at an effective temperature of 9,994 K.[4]