12 Pegasi is a
K-type supergiant star in the constellation of
Pegasus
Pegasus ( grc-gre, Πήγασος, Pḗgasos; la, Pegasus, Pegasos) is one of the best known creatures in Greek mythology. He is a winged divine stallion usually depicted as pure white in color. He was sired by Poseidon, in his role as hor ...
. It has a
spectral type of K0Ib Hdel0.5,
which indicates that it is a less luminous K-type supergiant with strong H-δ
Balmer lines
The Balmer series, or Balmer lines in atomic physics, is one of a set of six named series describing the spectral line emissions of the hydrogen atom. The Balmer series is calculated using the Balmer formula, an empirical equation discovered b ...
. The star has expanded to 81 times the
radius of the Sun
Solar radius is a unit of distance used to express the size of stars in astronomy relative to the Sun. The solar radius is usually defined as the radius to the layer in the Sun's photosphere where the optical depth equals 2/3:
:1\,R_ = 6.957\t ...
, and has an
effective temperature
The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation. Effective temperature is often used as an estimate of a body's surface temperature ...
of 4,185 K.
References
K-type supergiants
Pegasus (constellation)
Pegasi, 12
8321
207089
107472
Durchmusterung objects
{{supergiant-star-stub