| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Lacerta |
| Right ascension | 22h 31m 17.5010s[1] |
| Declination | +50° 16′ 56.969″[1] |
| Apparent magnitude (V) | 3.777[1] |
| Characteristics | |
| Spectral type | A1V[1] |
| U−B color index | 0.00[2] |
| B−V color index | +0.01[2] |
| R−I color index | −0.03[2] |
| Astrometry | |
| Radial velocity (Rv) | −4.0 ± 2[1] km/s |
| Proper motion (μ) | RA: 137.22[1] mas/yr Dec.: 17.15[1] mas/yr |
| Parallax (π) | 31.86 ± 0.54[1] mas |
| Distance | 102 ± 2 ly (31.4 ± 0.5 pc) |
| Absolute magnitude (MV) | 1.29[3] |
| Details | |
| Mass | ~2[4] M☉ |
| Radius | 1.9[5] R☉ |
| Luminosity (bolometric) | 27[4] L☉ |
| Temperature | 9200[4] K |
| Rotational velocity (v sin i) | 146[2] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Alpha Lacertae (Alpha Lac, α Lacertae, α Lac) is an A-type main sequence star in the constellation of Lacerta.[1] It is the brightest star in Lacerta and has an apparent visual magnitude of approximately 3.777.[1][4]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Lacerta |
| Right ascension | 22h 31m 13.2s[7] |
| Declination | +50° 17′ 09″[7] |
| Apparent magnitude (V) | 11.8[7] |
| Characteristics | |
| Spectral type | A5[7] |
| B−V color index | 0.0[7] |
| Position (relative to α Lacertae) | |
| Epoch of observation | 1925 |
| Angular distance | 36.3″ [6] |
| Position angle | 294° [6] |
| Other designations | |
| Database references | |
| SIMBAD | data |
The star has a visual companion, CCDM J22313+5017B, of spectral type A and apparent visual magnitude 11.8, approximately 36 arcseconds away.[6][7] The companion is optical, a chance line-of-sight coincidence.[2]
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