  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco [1] |
| Right ascension | 17h 25m 00.09774s [2] |
| Declination | +67° 18′ 24.1487″ [2] |
| Apparent magnitude (V) | 6.44 [1] |
| Characteristics | |
| Evolutionary stage | main sequence [2] |
| Spectral type | K0 V [1] |
| U−B color index | +0.29 [3] |
| B−V color index | +0.76 [3] |
| Astrometry | |
| Radial velocity (Rv) | −38.71±0.08 [1] km/s |
| Proper motion (μ) | RA: −531.749 [2] mas/yr Dec.: +4.818 [2] mas/yr |
| Parallax (π) | 78.1747±0.0226 mas [2] |
| Distance | 41.72 ± 0.01 ly (12.792 ± 0.004 pc) |
| Absolute magnitude (MV) | 5.89 [4] |
| Details | |
| Mass | 0.729 [5] M☉ |
| Radius | 0.7891±0.0144 [5] R☉ |
| Luminosity | 0.4090±0.0040 [5] L☉ |
| Surface gravity (log g) | 4.80 [6] cgs |
| Temperature | 5,203±46 [5] K |
| Metallicity [Fe/H] | −0.43±0.08 [7] dex |
| Rotational velocity (v sin i) | 3.4 [8] km/s |
| Age | 4.27 [7] Gyr |
| Other designations | |
| BD+67°1014, GJ 675, HD 158633, HIP 85235, HR 6518, SAO 17474, LHS 287, LTT 15185 [9] | |
| Database references | |
| SIMBAD | data |
HD 158633 is a main sequence star in the northern constellation of Draco. With an apparent visual magnitude of 6.43, this star is a challenge to view with the unaided eye but it can be seen clearly with a small telescope. Based upon parallax measurements, it is 42 light years from the Sun. The star is drifting closer to the Sun with a radial velocity of −39 km/s, [1] and is predicted to come to within 26.5 ly (8.1 pc) in around 190,400 years. [10]
This is a K-type main sequence star with a spectral classification of K0 V. It has about 79% of the Sun's radius and 73% of the solar mass. [5] It is an estimated 4.3 billion years old and is spinning with a projected rotational velocity of 3.4 km/s. [8] The star is emitting an excess of infrared radiation at a wavelength of 70 μm, suggesting the presence of an orbiting debris disk. [7] It has a low metallicity, with only 37% of the Sun's abundance of elements more massive than helium, [7] and has a relatively high proper motion. [2]
