Kappa Andromeda ( lat. Κ Andromedae , κ And ) in Bayer's designations is a bright star of magnitude 4.1 m [1] in the Andromeda constellation at a distance of 168 sv. years (52 pc ) from the Earth [4] . This is a subgiant of the spectral class B9IVn [5] . The radius of the star is 2.3 times larger than the solar [6] , its rotation speed is also higher, the estimated rotation speed is 176 km / s [7] . The outer shell of the star radiates energy into space with an effective temperature of 11 361 K [6] , giving the color of the star a blue-white tint.
| Kappa Andromeda | |||
|---|---|---|---|
| Star | |||
  | |||
| Observational data ( Age J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | |||
| Visible magnitude ( V ) | 4,139 [1] | ||
| Constellation | Andromeda | ||
| Astrometry | |||
| Radial velocity ( R v ) | −15.0 [2] km / s | ||
| Own movement (μ) | RA: +80.73 [4] Dec: −18.70 [4] | ||
| Parallax (π) | 19.37 ± 0.19 [4] mas | ||
| Specifications | |||
| Spectral class | B9IVn [5] | ||
| Color Index ( B - V ) | −0.067 [1] | ||
| Color Index ( U - B ) | −0.221 [1] | ||
| physical characteristics | |||
| Weight | 2.45 ± 0.05 M ☉ | ||
| Radius | 2.31 ± 0.09 [6] R ☉ | ||
| Temperature | 11 361 ± 66 [6] K | ||
| Rotation | 176 [7] | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
Planet System
In November 2012, at a distance of 55 ± 2 a.e. directly from the star, a young hot planet of the class of gas giants was observed, approximately 13 times larger than Jupiter in mass and slightly larger in size . Observations at different wavelengths indicate that the temperature of the planet is about 1700 K [8] .
See also
- List of exoplanets discovered by direct observation
Notes
- ↑ 1 2 3 4 P. Harmanec, J. Horn, P. Koubsky, F. Zdarsky, S. Kriz, K. Pavlovski. Photoelectric photometry at the Hvar Observatory. IV - A study of UBV variations of a group of bright northern Be stars // Bulletin of the Astronomical Institutes of Czechoslovakia. - 1980. - Vol. 31, No. 3 . - P. 144-159. - .
- ↑ D. R. Palmer, E. N. Walker, D. H. P. Jones, R. E. Wallis. The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars // Royal Observatory Bulletin. - 1968. - Vol. 135. - .
- ↑ 1 2 3 4 5 Gaia Data Release 2 - 2018.
- ↑ 1 2 3 4 Floor van Leeuwen. Validation of the new Hipparcos reduction // Astronomy and Astrophysics . - 2007, November. - Vol. 474, No. 2 . - P. 653-664. - DOI : 10.1051 / 0004-6361: 20078357 . - . - arXiv : 0708.1752 .
- ↑ 1 2 A. Cowley, C. Cowley, M. Jaschek, C. Jaschek. A study of the bright A stars. I. A catalog of spectral classifications // The Astronomical Journal . - 1969, April. - Vol. 74. - P. 375-406. - DOI : 10.1086 / 110819 . - .
- ↑ 1 2 3 4 5 E. L. Fitzpatrick, D. Massa. Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry // The Astronomical Journal . - 2005, March. - Vol. 129, No. 3 . - P. 1642-1662. - DOI : 10.1086 / 427855 . - . - arXiv : astro-ph / 0412542 .
- ↑ 1 2 F. Royer, J. Zorec, A. E. Gómez. Rotational velocities of A-type stars. III. Velocity distributions // Astronomy and Astrophysics. - 2007, February. - Vol. 463, No. 2 . - P. 671-682. - DOI : 10.1051 / 0004-6361: 20065224 . - . - arXiv : astro-ph / 0610785 .
- ↑ J. Carson, C. Thalmann, M. Janson, et al. Direct Imaging Discovery of a 'Super-Jupiter' Around the late B-Type Star κ And. - arXiv : 1211.3744 .
| Title (in order from the star) | Weight | Radius | Semi-major axis , a.e. | Circulation period days | Eccentricity |
|---|---|---|---|---|---|
| b | 12.8 +2 −1 M J | - | 55 ± 2 | - | - |