HD 26755
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  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Camelopardalis[1] |
| Right ascension | 04h 17m 08.09353s[2] |
| Declination | +57° 51′ 37.1513″[2] |
| Apparent magnitude (V) | 5.72±0.01[3] |
| Characteristics | |
| Evolutionary stage | red clump[4] |
| Spectral type | K1 III[5] |
| B−V color index | +1.09[6] |
| Astrometry | |
| Radial velocity (Rv) | −38.2±1.6[7] km/s |
| Proper motion (μ) | RA: +29.108 mas/yr[2] Dec.: −25.942 mas/yr[2] |
| Parallax (π) | 12.0207±0.1939 mas[2] |
| Distance | 271 ± 4 ly (83 ± 1 pc) |
| Absolute magnitude (MV) | +1.21[1] |
| Orbit[8] | |
| 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[9] M☉ |
| Radius | 9.44±0.47[10] R☉ |
| Luminosity | 42.5±1.3[2] L☉ |
| Surface gravity (log g) | 2.58±0.11[11] cgs |
| Temperature | 4,717±92[11] K |
| Metallicity [Fe/H] | +0.17±0.05[11] dex |
| Rotational velocity (v sin i) | 1±1[12] km/s |
| Age | 2.13[9] Gyr |
| Other designations | |
| AG+57°460, BD+57°787, GC 5139, HD 26755, HIP 19983, HR 1313, SAO 24514[13] | |
| Database references | |
| SIMBAD | data |
HD 26755, also known as HR 1313, is a spectroscopic binary[12][14] located in the northern circumpolar constellation Camelopardalis, the giraffe. It has an apparent magnitude of 5.72,[3] 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[2] and is currently drifting closer with a heliocentric radial velocity of −38 km/s.[7] At its current distance, HD 26755's brightness is diminished by 0.19 magnitudes due to interstellar dust.[15]
The visible component is an evolved red giant with a stellar classification of K1 III.[5] It is estimated to be 2.13 billion years old,[9] 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[9] and radiates 42.5 times the luminosity of the Sun[2] from its enlarged photosphere at an effective temperature of 4,717 K,[11] 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.[11] It spins slowly with a projected rotational velocity of 1 km/s,[12] which is poorly constrained.
