HD 151613 is a binary star[5] system in the northern circumpolar constellation of Draco. It is visible to the naked eye with an apparent visual magnitude of 4.84.[2] The distance to this star, as estimated from its annual parallax shift of 39.3 mas,[1] is 83 light years. It is moving closer to the Earth with a heliocentric radial velocity of −2 km/s.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| Right ascension | 16h 45m 17.88121s[1] |
| Declination | +56° 46′ 54.7985″[1] |
| Apparent magnitude (V) | 4.84[2] |
| Characteristics | |
| Spectral type | F2 V[3] |
| B−V color index | 0.375±0.013[2] |
| Astrometry | |
| Radial velocity (Rv) | −2.0[4] km/s |
| Proper motion (μ) | RA: 24.85 mas/yr Dec.: 67.07 mas/yr |
| Parallax (π) | 39.2932 ± 0.3182 mas[1] |
| Distance | 83.0 ± 0.7 ly (25.4 ± 0.2 pc) |
| Absolute magnitude (MV) | 2.71[2] |
| Orbit[5] | |
| Period (P) | 363.57 d |
| Eccentricity (e) | 0.35 |
| Periastron epoch (T) | 2415232.4 JD |
| Argument of periastron (ω) (secondary) | 80.7° |
| Semi-amplitude (K1) (primary) | 6.0 km/s |
| Details | |
| Mass | 1.43[4] M☉ |
| Radius | 1.6[6] R☉ |
| Luminosity | 6.91[2] L☉ |
| Surface gravity (log g) | 4.05[4] cgs |
| Temperature | 6,630[7] K |
| Metallicity [Fe/H] | −0.23[4] dex |
| Rotational velocity (v sin i) | 47.5±2.4[7] km/s |
| Age | 2.30[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a single-lined spectroscopic binary[3] system with an orbital period of 363.57 days and an eccentricity of 0.35.[5] The pair were resolved through speckle interferometry in 1977, showing an angular separation of 0.041″. They were later resolved in 1981 with a separation of 0.047″, but were unresolved during 20 other attempts between 1976–1991.[9] The system is a source of X-ray emission.[10] The visible component is an F-type main-sequence star with a stellar classification of F2 V.[3] It is around 2.3[4] billion years old with a projected rotational velocity of 48 km/s.[7]