| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h46m 13.01070s[1] |
| Declination | +41° 26′ 30.5041″[1] |
| Apparent magnitude (V) | 6.06[2] |
| Characteristics | |
| Spectral type | B3IVp[3][4] |
| B−V color index | −0.139±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | −15.0±2.9[2] km/s |
| Proper motion (μ) | RA: +1.093[1] mas/yr Dec.: −3.957[1] mas/yr |
| Parallax (π) | 2.5407 ± 0.0769 mas[1] |
| Distance | 1,280 ± 40 ly (390 ± 10 pc) |
| Absolute magnitude (MV) | −1.57[2] |
| Details | |
| Mass | 6.6±0.1[4] M☉ |
| Luminosity (bolometric) | 2,036[5] L☉ |
| Temperature | 17,900[5] K |
| Rotational velocity (v sin i) | 5[6] km/s |
| Age | 32.8±5.0[4] Myr |
| Other designations | |
BD+31°3369, FK5 3493, GC 25768, HD 174179, HIP 92243, HR 7081, SAO 67396[7] | |
| Database references | |
| SIMBAD | data |
HD 174179 is a single[8] star in the northern constellationofLyra. It has a white hue and is dimly visible to the naked eye with an apparent visual magnitude of 6.06.[2] The star is located at a distance of approximately 1,280 light years from the Sun based on parallax,[1] but is drifting closer with a radial velocity of −15 km/s.[2]
The star is an estimated 33[4] million years old with a low projected rotational velocity of 5 km/s.[6] It has 6.6[4] times the mass of the Sun and is radiating 2,036[5] times the Sun's luminosity from its photosphere at an effective temperature of 17,900 K.[5]
HD 174179 is a Be star, showing Balmer emission lines in its spectrum at times. It has a stellar classification of B3IVp,[4] with 'p' indicating spectral features of a shell star.[3] A 1976 study found no emission features,[9] but the star was reported to show emission lines again in later studies.[10][11]
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