HD 115337
Star in the constellation Camelopardalis
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HD 115337 is a binary star located in the northern circumpolar constellation Camelopardalis. The pair have a combined apparent magnitude of 6.25,[3] placing it near the limit for naked eye visibility. Parallax measurements place the system at a distance of 698 light years.[2] It has a heliocentric radial velocity of −9.4 km/s,[6] indicating that it is drifting towards the Solar System.
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Camelopardalis[1] |
| Right ascension | 13h 12m 25.43269s[2] |
| Declination | +80° 28′ 16.7089″[2] |
| Apparent magnitude (V) | 6.25[3] (6.33 + 9.04)[4] |
| Characteristics | |
| Spectral type | G8 III + A8 V:[5] |
| B−V color index | +0.94[3] |
| Astrometry | |
| Radial velocity (Rv) | −9.38±0.21[6] km/s |
| Proper motion (μ) | RA: −6.288 mas/yr[2] Dec.: +10.446 mas/yr[2] |
| Parallax (π) | 4.6717±0.0166 mas[2] |
| Distance | 698 ± 2 ly (214.1 ± 0.8 pc) |
| Absolute magnitude (MV) | −0.32[1] |
| Details | |
| A | |
| Mass | 3.4[2] M☉ |
| Radius | 16.4[2] R☉ |
| Luminosity | 161[2] L☉ |
| Surface gravity (log g) | 2.38[2] cgs |
| Temperature | 5,160[2] K |
| Metallicity [Fe/H] | −0.13[2] dex |
| Rotational velocity (v sin i) | <1[7] km/s |
| Age | 270[2] Myr |
| Other designations | |
| AG+80°289, BD+81 416, FK5 3056, GC 17932, HD 115337, HIP 64437, HR 5009, SAO 2164, WDS J13124+8028A[8] | |
| Database references | |
| SIMBAD | data |
Optical measurements from Mason et al. (2001) find the pair to have a mean separation of an arcsecond along a position angle of 184°.[9] The components have spectral classifications of K0 Ib[10] and A8 V,[5] indicating a K-type lower luminosity supergiant and an A-type main-sequence star (with uncertainty). At present the primary has 3.4 times the mass of the Sun and an enlarged radius of 16.4 R☉ due to its evolved status. It radiates 161 times the luminosity of the Sun from its photosphere at an effective temperature of 5,160 K,[11] giving a yellowish orange hue. HD 115337A is metal deficient, having an iron abundance only 74% of solar levels. Like most giants and supergiants, it spins slowly with a projected rotational velocity of less than 1 km/s.[7]
The physical characteristics of HD 115337A belong to a giant star as opposed to a supergiant. It has often been classified as G5 III[12] or G8 III,[5] more consistent with the above properties.