HD 75898

Last updated
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]
Distance 254.6 ± 0.7  ly
(78.1 ± 0.2  pc)
Absolute magnitude  (MV)3.49 [2]
Details [3]
Mass 1.295±0.015  M☉
Radius 1.58±0.11 [4]   R☉
Luminosity 2.9±0.3 [4]   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 [5]
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. [2]

Contents

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±0.0047422.82±0.220.105±0.009——
c8.49+0.65
−0.63  MJ 		7.39+0.04
−0.05		6717+44
−40		0.08±0.01153+2
−3 ° 		—

See also

Related Research Articles

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References

  1. 1 2 3 4 5 6 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. 1 2 3 4 5 6 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. 1 2 3 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 .
  4. 1 2 3 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.
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