HD 7449 is a star located in the constellation Keith about 127.2 light-years from us. At least two planets revolve around the stars.
| HD 7449 | |||
|---|---|---|---|
| Star | |||
| Observational data ( Age J2000.0 ) | |||
| Type of | Single star | ||
| Right ascension | |||
| Declination | |||
| Distance | 127.2 St. years (39 pc ) [1] | ||
| Visible magnitude ( V ) | 7.50 [1] | ||
| Constellation | Whale | ||
| Astrometry | |||
| Radial velocity ( R v ) | -19.90 [2] km / s | ||
| Own movement (μ) | RA: -160.79 [2] Dec: -138.95 [2] | ||
| Parallax (π) | 25.69 ± 0.48 [2] mas | ||
| Absolute magnitude (V) | 4,57 [1] | ||
| Specifications | |||
| Spectral class | F8V [1] | ||
| Color Index ( B - V ) | 0.575 [1] | ||
| physical characteristics | |||
| Weight | 1.05 [1] M ☉ | ||
| Radius | 1.01 [1] R ☉ | ||
| Age | 2.10 ± 0.24 billion [1] years | ||
| Temperature | 6024 ± 13 [1] K | ||
| Luminosity | 1.21 [1] L ☉ | ||
| Metallicity | [Fe / H] = - 0.11 ± 0.01 [1] | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
| Sources: [2] | |||
Content
Features
HD 7449 is a main sequence star with a mass and radius almost equal to that of the sun . [1] The surface temperature of the star is about 6024 Kelvin . Scientists estimate the age of HD 7449 at approximately 2.1 billion years.
Planet System
In 2011, a group of researchers announced the discovery [1] of two planets in the system. These are gas giants similar to Jupiter . Planet HD 7449 b orbits at a distance of 2.3 AU from the parent star, making a complete revolution in 1275 days. Planet HD 7449 c is located a little further - at a distance of 4.96 AU from a star, making a complete revolution in almost 11 years. The discovery of both planets was accomplished using the method of calculating proper motion using a HARPS spectrograph .
| Planet | Weight ( M J ) | Radius ( R J ) | Circulation period ( days ) | Semimajor axis orbits ( a.u. ) | Eccentricity orbits |
|---|---|---|---|---|---|
| b | 1.11 ± 0.37 | ? | 1275 ± 13 | 2.3 ± 0.04 | 0.82 ± 0.06 |
| c | 2 ± 0.5 | ? | 4046 ± 366 | 4.96 ± 0.3 | 0.53 ± 0.08 |
|
Notes
- ↑ 1 2 3 4 5 6 7 8 9 10 11 12 13 X. Dumusque, C. Lovis, D. Ségransan, M. Mayor, S. Udry, W. Benz, F. Bouchy, G. Lo Curto, C. Mordasini , F. Pepe, D. Queloz, NC Santos, D. Naef. The HARPS search for southern extra-solar planets. XXX Planetary systems around stars with solar-like magnetic cycles and short-term activity variation . Arxiv.org (8 Jul 2011). Date of treatment August 12, 2011. Archived on August 25, 2012.
- ↑ 1 2 3 4 5 SIMBAD - HD 7449 in the SIMBAD database . Date of treatment August 12, 2011.
See also
- List of stars constellation China