HD 41248 is a star located in the constellation Painter at a distance of about 170 light years from us. At least two planets revolve around the stars.
| HD 41248 | |||
|---|---|---|---|
| Star | |||
 HD 41248 by the artist. | |||
| Observational data ( Age J2000.0 ) | |||
| Type of | Single star | ||
| Right ascension | |||
| Declination | |||
| Distance | 170 St. years (52.38 pc ) [1] | ||
| Visible magnitude ( V ) | 8.82 [1] | ||
| Constellation | Painter | ||
| Astrometry | |||
| Radial velocity ( R v ) | 3.2 [2] km / s | ||
| Own movement (μ) | RA: 125.88 [2] Dec: 58.53 [2] | ||
| Parallax (π) | 19.09 ± 0.71 [2] mas | ||
| Absolute magnitude (V) | 5.22 ± 0.08 [1] | ||
| Specifications | |||
| Spectral class | G2V [2] | ||
| Color Index ( B - V ) | 0.624 [1] | ||
| physical characteristics | |||
| Weight | 0.92 ± 0.05 [1] M ☉ | ||
| Radius | 0.78 ± 0.04 [1] R ☉ | ||
| Age | 2 billion [1] years | ||
| Temperature | 5713 ± 50 [1] K | ||
| Luminosity | 0.68 ± 0.03 [1] L ☉ | ||
| Metallicity | [Fe / H] = - 0.43 ± 0.10 [1] | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
| Sources: [2] | |||
Content
Features
HD 41248 - a star of 8.82 visible magnitude; for the first time in astronomical literature is mentioned in the catalog of Henry Draper , published at the beginning of the XX century . It is a yellow dwarf with a mass and radius equal to 92% and 78% of the solar, respectively. [1] The luminosity of a star is 68% of the solar. The surface temperature of HD 41248 is approximately 5713 Kelvin . The age of the star is estimated at approximately 2 billion years.
Planet System
In 2013, a group of European astronomers announced the discovery [1] of two planets in the system. Both of them belong to the type of hot gas giants , which are close to the parent star. They are comparable in mass with Neptune : the planet HD 41248 b has a mass equal to 3% of the mass of Jupiter ; planet HD 41248 c has a mass equal to 2% of Jupiter. The discovery of both planets was accomplished by Doppler spectroscopy . The table below shows their detailed specifications.
After a series of new measurements in 2014, the planetary system was closed: the 18-day period of radial velocity fluctuations was not confirmed, and the 25-day period was explained by the activity of the star itself with differential rotation and a large number of spots [3] .
| Planet | Weight ( M J ) | Radius ( R J ) | Circulation period ( days ) | Semimajor axis orbits ( a.u. ) | Eccentricity orbits |
|---|---|---|---|---|---|
| b | 0.039 ± 0.017 | - | 18.36 ± 0.6 | 0.137 ± 0.017 | 0.15 ± 0.13 |
| c | 0.027 ± 0.016 | - | 25.65 ± 0.13 | 0.172 ± 0.2 | 0 |
Notes
- ↑ 1 2 3 4 5 6 7 8 9 10 11 12 James S. Jenkins, Mikko Tuomi, Ramon Brasser, Oleksiy Ivanyuk, Felipe Murgas. Two Super-Earths Orbiting the Solar Analogue HD41248 on the edge of a 7: 5 Mean Motion Resonance . Arxiv.org (30 Apr 2013). Date of appeal May 15, 2013.
- ↑ 1 2 3 4 5 6 SIMBAD (English) . - HD 41248 in the SIMBAD database . Date of treatment May 10, 2013.
- ↑ News of planetary astronomy
See also
- List of stars of the constellation Painter