• Source: 10 Lacertae

10 Lacertae (10 Lac) is a star in the constellation Lacerta. With an apparent magnitude of 4.9, it is located around 550 parsecs (1,800 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.
It 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.
It is the star with the smallest angular diameter measured by the CHARA array, at 0.11±0.02 milliarcseconds.
10 Lacertae has an 8th magnitude companion about one arc-minute away.




References

Kata Kunci Pencarian:

• Beta Lacertae
• Bintang deret utama tipe-O
• Daftar galaksi
• Daftar bintang di rasi bintang Lacerta
• 10 Lacertae
• BL Lacertae object
• BL Lacertae
• O-type main-sequence star
• Stellar classification
• O-type star
• Blazar
• Lacerta
• List of O-type stars
• Beta Lacertae