11 Lacertae
Star in the constellation Lacerta
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11 Lacertae is a star in the northern constellation of Lacerta. It is visible to the naked eye as a faint orange-hued star with an apparent visual magnitude of 4.46.[3] It lies at a distance of about 350[2] light years and has an absolute magnitude -0.54.[7] The object is moving closer to the Earth with a heliocentric radial velocity of â10.9 km/s.[6]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lacerta[1] |
| Right ascension | 22h 40m 30.85848s[2] |
| Declination | +44° 16â² 34.7069â³[2] |
| Apparent magnitude (V) | 4.46[3] |
| Characteristics | |
| Evolutionary stage | red clump[4] |
| Spectral type | K2.5 III[5] |
| UâB color index | +1.36[3] |
| BâV color index | +1.33[3] |
| Astrometry | |
| Radial velocity (Rv) | â10.91±0.09[6] km/s |
| Proper motion (μ) | RA: +93.728 mas/yr[2] Dec.: +10.946 mas/yr[2] |
| Parallax (Ï) | 9.317±0.105 mas[2] |
| Distance | 350 ± 4 ly (107 ± 1 pc) |
| Absolute magnitude (MV) | â0.54[7] |
| Details | |
| Mass | 1.38[4] Mâ |
| Radius | 29.5±0.5[8] Râ |
| Luminosity | 279±10[9] Lâ |
| Surface gravity (log g) | 1.56±0.06[9] cgs |
| Temperature | 4,352[10] K |
| Metallicity [Fe/H] | â0.2±0.02[9] dex |
| Rotational velocity (v sin i) | 8[11] km/s |
| Age | 3.2[4] Gyr |
| Other designations | |
| 11 Lac, BD+43°4266, HD 214868, HIP 111944, HR 8632, SAO 52251[12] | |
| Database references | |
| SIMBAD | data |
This is an evolved giant star with a stellar classification of K2.5 III.[5] It is a red clump giant, meaning it is fusing helium in its core after passing through the red giant branch.[4] The star is 3.2[4] billion years old with 1.38 times the mass of the Sun and has expanded to 39 times the Sun's radius.[8] It is radiating 280[9] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,352 K.[10]