Hypatia (exoplanet)
|
Exoplanet Hypatia |
|
|---|---|
|
|
|
| Artist's impression of Hypatia | |
| Constellation | Dragon |
| Position equinox : J2000.0 |
|
| Right ascension | 15h 24m 57.775s |
| declination | + 58 ° 57 ′ 57.818 ″ |
| Orbit data | |
| Central star | Edasich |
| Major semi-axis | 1.28 ± 0.07 AU |
| eccentricity | 0.71 ± 0.01 |
| Period of circulation | 510.72 ± 0.07 d |
| Further data | |
| Minimum dimensions | 8.82 ± 0.72 M J |
| distance | 31.5 pc |
| method | Radial velocity method |
| Orbit inclination | 69.9 ± 43.3 deg |
| history | |
| discovery | Sabine Frink et al. |
| Date of discovery | 2002 |
Hypatia ( Iota Draconis b ) is an exoplanet that orbits the orange giant Edasich ( Iota Draconis ) every 511 days . Due to its mass , it is assumed that it is a gas planet .
Origin of name
Like all exoplanets, Hypatia was originally designated with the star's official name and a lowercase letter, according to the order in which it was discovered. After a public IAU competition , on December 15, 2015, it was officially named after the late ancient Greek astronomer, mathematician and philosopher Hypatia .
discovery
The planet was discovered by Sabine Frink and colleagues in 2001. The verification was carried out with the aid of the radial velocity method . It was the first planet to be detected around a giant star. This was seen as evidence that planets can survive the transition of their parent star from the main sequence to the group of giant stars.
Circulation and mass
The planet orbits its star at a mean distance of about 1.3 astronomical units . Due to its high eccentricity of 0.71, it approaches up to 0.4 AU in the periastron and moves away again to over 2 AU. Hypatia has a mass of at least 8.8 Jupiter masses (2800 Earth masses ). It could well be that the mass is significantly higher and Hypatia is a brown dwarf .
Individual evidence
- ↑ iot Dra b. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed March 7, 2020 .
- ↑ a b c d e f g HIP 75458 b. In: Extrasolar Planets Encyclopaedia . Retrieved March 7, 2020 .
- ↑ International Astronomical Union: NameExoWorlds - The Approved Names. Retrieved January 3, 2016 .
- ↑ Sabine Frink, David S. Mitchell, Andreas Quirrenbach, Debra A. Fischer, Geoffrey W. Marcy, R. Paul Butler: Discovery of a Substellar Companion to the K2 III Giant Iota Draconis . In: The Astrophysical Journal . 576, No. 1, 2002, pp. 478-484. bibcode : 2002ApJ ... 576..478F . doi : 10.1086 / 341629 .