14 Trianguli
Star in the constellation Triangulum
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14 Trianguli (14 Tri), also known as HD 15656, is a spectroscopic binary[14] located in the northern constellation Triangulum. It has an apparent magnitude of 5.14,[2] making it faintly visible to the naked eye in ideal conditions. Gaia DR3 parallax measurements place the system 433 light years away,[1] and it is currently approaching the Solar System with a heliocentric radial velocity of −37 km/s.[5] At its current distance, 14 Tri's brightness is diminished by 0.21 magnitude due to interstellar dust.[15] It has an absolute magnitude of −0.46.[6]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Triangulum |
| Right ascension | 02h 32m 06.16977s[1] |
| Declination | +36° 08′ 50.1813″[1] |
| Apparent magnitude (V) | 5.14±0.01[2] |
| Characteristics | |
| Spectral type | K5 III[3] |
| U−B color index | +1.78[4] |
| B−V color index | +1.47[4] |
| Astrometry | |
| Radial velocity (Rv) | −36.8±0.3[5] km/s |
| Proper motion (μ) | RA: +45.066 mas/yr[1] Dec.: +11.901 mas/yr[1] |
| Parallax (π) | 7.5319±0.1060 mas[1] |
| Distance | 433 ± 6 ly (133 ± 2 pc) |
| Absolute magnitude (MV) | −0.46[6] |
| Orbit[7] | |
| Primary | 14 Tri A |
| Name | 14 Tri B |
| Period (P) | 6,257±73 d |
| Eccentricity (e) | 0.22±0.04 |
| Periastron epoch (T) | 2,448,284±166 JD |
| Argument of periastron (ω) (secondary) | 40±11° |
| Semi-amplitude (K1) (primary) | 2.27±0.09 km/s |
| Details | |
| Mass | 1.85±0.09[8] M☉ |
| Radius | 38.66±1.18[9] R☉ |
| Luminosity | 325±17[9] L☉ |
| Surface gravity (log g) | 1.65[10] cgs |
| Temperature | 3,991[9] K |
| Metallicity [Fe/H] | −0.16[11] dex |
| Rotational velocity (v sin i) | 2.1±1.2[12] km/s |
| Other designations | |
| 14 Trianguli, AG+35°233, BD+35°497, FK5 1070, GC 3032, HD 15656, HIP 11784, HR 736, SAO 55635[13] | |
| Database references | |
| SIMBAD | data |
The visible component is an evolved red giant with a stellar classification of K5 III. It has 1.85 times the mass of the Sun,[8] but it has expanded to 39 times its girth. It radiates 325 times the luminosity of the Sun from its photosphere at an effective temperature of 3,991 K,[9] giving it an orangish-red hue. 14 Tri is slightly metal-deficient with [Fe/H] = −0.16,[11] and spins modestly with a projected rotational velocity of 2.1 km/s.[12] This is a single-lined spectroscopic binary that completes an eccentric orbit within 17 years. The secondary star has not been detected visually or in the spectrum and is expected to be a low-mass red dwarf or white dwarf.[7] 14 Tri may be part of the Wolf 630 moving group.[16]