HAT-P-2 ( HD 147506 ) is a star located in the constellation Hercules at a distance of about 440 light-years from us. At least one planet orbits a star.
| Hat-p-2 | |||
|---|---|---|---|
| Star | |||
| Observational data ( Age J2000.0 ) | |||
| Type of | Single star | ||
| Right ascension | |||
| Declination | |||
| Distance | 440 St. years (135 pc ) [1] | ||
| Visible magnitude ( V ) | 8.7 | ||
| Constellation | Hercules | ||
| Astrometry | |||
| Radial velocity ( R v ) | |||
| Own movement (μ) | RA: -10.64 [3] Dec: -29.70 [3] | ||
| Parallax (π) | 7.39 ± 0.88 [3] mas | ||
| Absolute magnitude (V) | 3.54 [1] | ||
| Specifications | |||
| Spectral class | F8V [1] | ||
| physical characteristics | |||
| Weight | 1,298 [1] M ☉ | ||
| Radius | 1,474 [1] R ☉ | ||
| Age | 2.6 billion [1] years | ||
| Temperature | 6290 ± 110 [1] K | ||
| Metallicity | + 0.12 ± 0.08 [1] | ||
| Rotation | 19.8 ± 1.6 [1] | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
| Sources: [3] | |||
Content
Features
HAT-P-2 belongs to the class of dwarfs of the main sequence . Its mass and radius are equivalent to 1.29 and 1.47 solar, respectively. [1] A star is noticeably brighter than our daylight: its luminosity is about 280% of the sun. The age of the star is estimated at approximately 2.6 billion years.
Planet System
In 2007, a team of astronomers working as part of the HATNet project announced the discovery [1] of the planet HAT-P-2 b in the system. This is a very massive gas giant : having dimensions almost like that of Jupiter , HAT-P-2 b exceeds Jupiter by weight more than 8 times. The planet turns very close to the parent star, so the upper layers of its atmosphere must be heated to such an extent that they evaporate into outer space. The discovery was made by the transit method .
| Planet | Weight ( M J ) | Radius ( R J ) | Circulation period ( days ) | Semimajor axis orbits ( a.u. ) | Eccentricity orbits |
|---|---|---|---|---|---|
| b | 8.74 ± 0.26 | 1.19 ± 0.1 | 5,633 | 0.067 ± 0.001 | 0.517 ± 0.003 |
Notes
- ↑ 1 2 3 4 5 6 7 8 9 10 11 GA Bakos, G. Kovacs, G. Torres, DA Fischer, DW Latham, RW Noyes, DD Sasselov, T. Mazeh, A. Shporer, RP Butler, RP Stefanik, JM Fernandez, A. Sozzetti, A. Pal, J. Johnson, GW Marcy, J. Winn, B. Sipocz, J. Lazar, I. Papp, P. Sari. HD147506b: A Super-Massive Planet in an Eccentric Orbit Transiting a Bright Star . Arxiv.org (May 1, 2007). Date of treatment September 24, 2010. Archived June 20, 2012.
- ↑ 1 2 3 4 5 6 Gaia Data Release 2 - 2018.
- ↑ 1 2 3 4 SIMBAD - HAT-P-2 in the SIMBAD database . Date of treatment September 22, 2010.
See also
- List of stars of the constellation Hercules