HD 75898 b

HD 75898 / Stribor
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lynx
Right ascension 08h 53m 50.80524s[1]
Declination +33° 03′ 24.5206″[1]
Apparent magnitude (V) 8.03[2]
Characteristics
Spectral type F8V[2]
B−V color index 0.626[2]
Astrometry
Radial velocity (Rv)21.79±0.13[1] km/s
Proper motion (μ) RA: −95.110(29) mas/yr[1]
Dec.: −28.503(26) mas/yr[1]
Parallax (π)12.8110 ± 0.0329 mas[1]
Distance254.6 ± 0.7 ly
(78.1 ± 0.2 pc)
Absolute magnitude (MV)3.49[2]
Details[3]
Mass1.295±0.015 M☉
Radius1.58±0.11[4] R☉
Luminosity2.9±0.3[4] L☉
Surface gravity (log g)4.34±0.13 cgs
Temperature6122±52 K
Metallicity [Fe/H]+0.29±0.06 dex
Rotational velocity (v sin i)4.2±0.5 km/s
Age3.2±0.4 Gyr
Other designations
Stribor, BD+33°1776, HD 75898, HIP 43674, SAO 61116[5]
Database references
SIMBADdata

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.[2]

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.[6]

Planetary system

The planet HD 75898 b was discovered by the radial velocity method in 2007.[2] 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.[4]

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.[3]

The HD 75898 planetary system[3]
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

  1. ^ a b c d e 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.
  2. ^ a b c d e f 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.
  3. ^ a b c 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. hdl:2108/390324.
  4. ^ a b c 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.
  5. ^ "HD 75898". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-12-28.
  6. ^ Lukačić, Mirjana (2019-12-20). "EKSKLUZIVNE PRVE SNIMKE Upoznajte Stribora, prvu hrvatsku zvijezdu na nebu". www.icv.hr (in Croatian). Retrieved 2020-04-04.