16 Lyrae is a suspected astrometric binary[8] star system in the constellation Lyra,[7] located 126 light years away from the Sun based on parallax.[1] It is visible to the naked eye as a dim, white-hued star with a combined apparent visual magnitude of 5.00.[2] The system is moving further away from the Earth with a heliocentric radial velocity of +5 km/s.[2] It is a suspected member of the Ursa Major Moving Group stream.[9]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 01m 26.38228s[1] |
| Declination | +46° 56′ 05.1398″[1] |
| Apparent magnitude (V) | 5.00[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A6 IV[4] or A7 V[5] |
| B−V color index | +0.186±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | +4.9±0.9[2] km/s |
| Proper motion (μ) | RA: +22.239[1] mas/yr Dec.: −80.409[1] mas/yr |
| Parallax (π) | 25.9005 ± 0.1377 mas[1] |
| Distance | 125.9 ± 0.7 ly (38.6 ± 0.2 pc) |
| Absolute magnitude (MV) | +2.13[2] |
| Details | |
| Mass | 1.80±0.01[3] M☉ |
| Radius | 1.87+0.04 −0.09[1] R☉ |
| Luminosity | 12.043±0.079[1] L☉ |
| Surface gravity (log g) | 4.28[6] cgs |
| Temperature | 7870+191 −93[1] K |
| Rotational velocity (v sin i) | 124[3] km/s |
| Age | 791[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Cowley et al. (1969) found a stellar classification of A7 V[5] for the visible component, matching an A-type main-sequence star that is generating energy through hydrogen fusion at its core. Abt and Morrell (1995) instead listed a class of A6 IV,[4] suggesting it has left the main sequence and become a subgiant star. It is 791[6] million years old with a high rate of spin, showing a projected rotational velocity of 124 km/s.[3] This system is a source for X-ray emission with a luminosity of 105.3×1020 W, which is most likely coming from the unseen companion.[10]