| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 08 53 50.80524 |
| Declination | +33° 03′ 24.5206″ |
| Apparent magnitude (V) | 8.03 |
| Characteristics | |
| Spectral type | F8V |
| B−V color index | 0.626 |
| Astrometry | |
| Radial velocity (Rv) | 21.79±0.13 km/s |
| Proper motion (μ) | RA: −95.110(29) mas/yr Dec.: −28.503(26) mas/yr |
| Parallax (π) | 12.8110 ± 0.0329 mas |
| Distance | 254.6 ± 0.7 ly (78.1 ± 0.2 pc) |
| Absolute magnitude (MV) | 3.49 |
| Details | |
| Mass | 1.295±0.015 M☉ |
| Radius | 1.58±0.11 R☉ |
| Luminosity | 2.9±0.3 L☉ |
| Surface gravity (log g) | 4.34±0.13 cgs |
| Temperature | 6122±52 K |
| Metallicity | +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 | |
| Database references | |
| SIMBAD | data |
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.
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.
Planetary system
The planet HD 75898 b was discovered by the radial velocity method in 2007. 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.
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.
| 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° |
— |
See also
References
- ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ Robinson, Sarah E.; et al. (2007). "Two Jovian-Mass Planets in Earthlike Orbits". The Astrophysical Journal. 670 (2): 1391–1400. arXiv:0708.0832. Bibcode:2007ApJ...670.1391R. doi:10.1086/522106. S2CID 14454598.
- ^ Ruggieri, A.; Desidera, S.; et al. (September 2024). "The GAPS Programme at TNG: LVIII. Two multi-planet systems with long-period substellar companions around metal-rich stars". Astronomy & Astrophysics. 689: A235. Bibcode:2024A&A...689A.235R. doi:10.1051/0004-6361/202449456.
- ^ Ment, Kristo; et al. (2018). "Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810". The Astronomical Journal. 156 (5). 213. arXiv:1809.01228. Bibcode:2018AJ....156..213M. doi:10.3847/1538-3881/aae1f5. S2CID 119243619.
- "HD 75898". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-12-28.
- Lukačić, Mirjana (2019-12-20). "EKSKLUZIVNE PRVE SNIMKE Upoznajte Stribora, prvu hrvatsku zvijezdu na nebu". www.icv.hr (in Croatian). Retrieved 2020-04-04.
External links
- "HD 75898". Extrasolar Planets Encyclopaedia. Archived from the original on July 2, 2007.
