  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 04h 17m 08.09353s [1] |
| Declination | +57° 51′ 37.1513″ [1] |
| Apparent magnitude (V) | 5.72±0.01 [2] |
| Characteristics | |
| Spectral type | K1 III [3] |
| B−V color index | +1.09 [4] |
| Astrometry | |
| Radial velocity (Rv) | −38.2±1.6 [5] km/s |
| Proper motion (μ) | RA: +29.108 mas/yr [1] Dec.: −25.942 mas/yr [1] |
| Parallax (π) | 12.0207±0.1939 mas [1] |
| Distance | 271 ± 4 ly (83 ± 1 pc) |
| Absolute magnitude (MV) | +1.21 [6] |
| Orbit [7] | |
| Primary | A |
| Companion | B |
| Period (P) | 1,658.7±2.9 d |
| Eccentricity (e) | 0.309±0.005 |
| Periastron epoch (T) | 2,453,848±5 JD |
| Argument of periastron (ω) (secondary) | 31.2±1.2° |
| Semi-amplitude (K1) (primary) | 6.10±0.04 km/s |
| Details | |
| Mass | 1.68 [8] M☉ |
| Radius | 9.44±0.47 [9] R☉ |
| Luminosity | 42.5±1.3 [1] L☉ |
| Surface gravity (log g) | 2.58±0.11 [10] cgs |
| Temperature | 4,717±92 [10] K |
| Metallicity [Fe/H] | +0.17±0.05 [10] dex |
| Rotational velocity (v sin i) | 1±1 [11] km/s |
| Age | 2.13 [8] Gyr |
| Other designations | |
| AG+57°460, BD+57°787, GC 5139, HD 26755, HIP 19983, HR 1313, SAO 24514 [12] | |
| Database references | |
| SIMBAD | data |
HD 26755, also known as HR 1313, is a spectroscopic binary [11] [13] located in the northern circumpolar constellation Camelopardalis, the giraffe. It has an apparent magnitude of 5.72, [2] making it faintly visible to the naked eye under ideal conditions. Gaia DR3 parallax measurements place the system at a distance of 271 light years [1] and is currently drifting closer with a heliocentric radial velocity of −38 km/s . [5] At its current distance, HD 26755's brightness is diminished by 0.19 magnitudes due to interstellar dust. [14]
The visible component is an evolved red giant with a stellar classification of K1 III. [3] It is estimated to be 2.13 billion years old, [8] enough time for the star to exhaust its core hydrogen and evolve to become a red giant. It has cooled and expanded to 9.4 times the Sun's radius. It has 1.68 times the mass of the Sun [8] and radiates 42.5 times the luminosity of the Sun [1] from its enlarged photosphere at an effective temperature of 4,717 K , [10] giving it an orange hue when viewed in the night sky. HD 26755 is a metal enriched star with an iron abundance 48% greater than the Sun. [10] It spins slowly with a projected rotational velocity of 1 km/s , [11] which is poorly constrained.
