HD 75898
Star in the constellation Lynx
From Wikipedia, the free encyclopedia
HD 75898 is an 8th magnitude star approximately 255 light-years away in the constellation Lynx. The star is 28% more massive, 60% larger, and 3 times as luminous as the Sun. It is a metal-rich star, with 186% the solar abundance of iron. In 2007 the California and Carnegie Planet Search team found one planet orbiting HD 75898.[3]
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Lynx[1] |
| Right ascension | 08h 53m 50.80524s[2] |
| Declination | +33° 03′ 24.5206″[2] |
| Apparent magnitude (V) | 8.03[3] |
| Characteristics | |
| Spectral type | F8V[3] |
| B−V color index | 0.626[3] |
| Astrometry | |
| Radial velocity (Rv) | 21.79±0.13[2] km/s |
| Proper motion (μ) | RA: −95.110(29) mas/yr[2] Dec.: −28.503(26) mas/yr[2] |
| Parallax (π) | 12.8110±0.0329 mas[2] |
| Distance | 254.6 ± 0.7 ly (78.1 ± 0.2 pc) |
| Absolute magnitude (MV) | 3.49[3] |
| Details[4] | |
| Mass | 1.295±0.015 M☉ |
| Radius | 1.58±0.11[5] R☉ |
| Luminosity | 2.9±0.3[5] L☉ |
| Surface gravity (log g) | 4.34±0.13 cgs |
| Temperature | 6122±52 K |
| Metallicity [Fe/H] | +0.29±0.06 dex |
| Rotational velocity (v sin i) | 4.2±0.5 km/s |
| Age | 3.2±0.4 Gyr |
| Other designations | |
| Stribor, BD+33°1776, HD 75898, HIP 43674, SAO 61116[6] | |
| Database references | |
| SIMBAD | data |
Nomenclature
In 2019 the HD 75898 system was chosen as part of the NameExoWorlds campaign organised by the International Astronomical Union, which assigned each country a star and planet to be named. HD 75898 was assigned to Croatia. The winning proposal named the star Stribor, after the god of winds in Slavic mythology, and the planet b Veles, after a deity of earth, water and the underworld in Slavic mythology.[7]
Planetary system
The planet HD 75898 b was discovered by the radial velocity method in 2007.[3] At the time the centre of mass of the system appeared to be accelerating, indicating the presence of a third, more distant, component at least the mass of Jupiter. Later additional monitoring however indicated that this long-period signal was likely a result of long-term magnetic activity on the parent star.[5]
However in 2024, an additional long-period planet, HD 75898 c, was confirmed using both astrometry and radial velocity, in addition to an intermediate-period activity cycle. Both planets are super-Jupiters, with planet c having a mass 8.5 times that of Jupiter, and planet b having a minimum mass 2.5 times that of Jupiter, with a likely true mass of about 6 Jupiters if coplanar orbits are assumed.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b (Veles) | ≥2.55±0.04 MJ | 1.2025±0.0047 | 422.82±0.22 | 0.105±0.009 | — | — |
| c | 8.49+0.65 −0.63 MJ |
7.39+0.04 −0.05 |
6717+44 −40 |
0.08±0.01 | 153+2 −3 |
— |