10 Lacertae
  | ||
| Observation data J2000
| ||
|---|---|---|
| Constellation | Lacerta
| |
| Right ascension | 22h 39m 15.67864s[1] | |
| Declination | +39° 03′ 00.9712″[1] | |
| Apparent magnitude (V) | 4.880[2] | |
| Characteristics | ||
| Spectral type | O9V[3] | |
| U−B color index | −1.010[2] | |
| B−V color index | −0.210[2] | |
| Variable type | β Cep?[4] | |
| Absolute magnitude (MV) | −4.40[7] | |
| Details Rotational velocity (v sin i)35 km/s | | |
NSV 25932, WDS J22393+3903 | ||
| Database references | ||
| SIMBAD | data | |
10 Lacertae (10 Lac) is a
Lacerta. With an apparent magnitude of 4.9, it is located around 700 parsecs (2,300 ly) distant in the small Lacerta OB1 association. It is a hot blue main-sequence star of spectral type O9V, a massive star that is currently fusing its core hydrogen. It is a suspected Beta Cephei variable
star.
10 Lacertae was one of the first O-type stars (along with S Monocerotis) to be defined as an anchor point for the MKK spectral classification; since the early twentieth century it has served as such a point. Specifically, the star is representative of O9V stars, meaning relatively cool O-type stars on the main-sequence.[8]
10 Lacertae has an 8th magnitude companion about one arc-minute away.[9]
References
- ^ S2CID 18759600.
- ^ ISSN 0365-0138.
- S2CID 119248206.
- Bibcode:2009yCat....102025S.
- S2CID 119231169.
- Bibcode:2011sca..conf..299K.
- ^ S2CID 9965794.
- Bibcode:1994ASPC...60....3G.
- Bibcode:1994CoORB.115.....D.
