Delta2 Lyrae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 54m 30.28269s |
| Declination | +36° 53′ 55.0317″ |
| Apparent magnitude (V) | 4.22 – 4.33 |
| Characteristics | |
| Evolutionary stage | AGB |
| Spectral type | M4 II |
| U−B color index | +1.65 |
| B−V color index | +1.68 |
| Variable type | SRc? |
| Astrometry | |
| Radial velocity (Rv) | −25.55 km/s |
| Proper motion (μ) | RA: −6.598 mas/yr Dec.: 1.953 mas/yr |
| Parallax (π) | 4.2352±0.2951 mas |
| Distance | 770+68 −42 ly (237+21 −13 pc) |
| Absolute magnitude (MV) | −3.3 |
| Details | |
| Mass | 4.5±1 M☉ |
| Radius | 293+19 −22 R☉ |
| Luminosity | 10,248±1,500 L☉ |
| Surface gravity (log g) | 0 cgs |
| Temperature | 3,394±32 K |
| Age | 75 Myr |
| Other designations | |
| Delta2 Lyrae, 12 Lyrae, HR 7139, BD+36°3319, HD 175588, SAO 67559, HIP 92791, GC 25959, CCDM J18545+3654, WDS J18545+3654 | |
| Database references | |
| SIMBAD | data |
Delta2 Lyrae (δ2 Lyr) is a 4th magnitude star in the constellation Lyra, approximately 770 light years away from Earth. It is visible to the naked eye. It is one of the M4II spectral standard stars.