| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lacerta |
| Right ascension | 22h 52m 02.03323s[1] |
| Declination | +43° 18′ 44.7028″[1] |
| Apparent magnitude (V) | 4.95[2] + 11.9[3] |
| Characteristics | |
| Spectral type | M0 III[4] |
| B−V color index | 1.559±0.010[2] |
| Astrometry | |
| Radial velocity (Rv) | −19.21±0.20[2] km/s |
| Proper motion (μ) | RA: +109.890±0.214[1] mas/yr Dec.: +23.581±0.215[1] mas/yr |
| Parallax (π) | 9.6841 ± 0.1425 mas[1] |
| Distance | 337 ± 5 ly (103 ± 2 pc) |
| Absolute magnitude (MV) | −0.04[2] |
| Details | |
| Radius | 37.30+0.61 −1.02[1] R☉ |
| Luminosity | 294.5±5.1[1] L☉ |
| Surface gravity (log g) | 1.352[5] cgs |
| Temperature | 3,915+55 −32[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
15 Lacertae is a binary star[7] system in the northern constellation of Lacerta, near the southeast constellation border with Andromeda. It is faintly visible to the naked eye with an apparent visual magnitude of 4.95.[2] The distance to this system is approximately 337 light years based on parallax.[1] It is drifting closer to the Sun with a radial velocity of −19 km/s.[2] The absolute magnitude of 15 Lacertae is −0.04.[2]
The primary component is an aging red giant with a stellar classification of M0 III.[4] With the supply of hydrogen at its core exhausted, the star has cooled and expanded to 37 times the Sun's radius. It is radiating 295 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,915 K,[1] giving it a reddish hue.
The secondary companion was discovered by American astronomer S. W. Burnham in 1888. It has a visual magnitude of 11.9 and is located at an angular separation of 23.6″ from the primary along a position angle of 159°, as of 2014.[3]
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