HD 68988
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 08h 18m 22.1727s[1] |
| Declination | +61° 27′ 38.5973″[1] |
| Apparent magnitude (V) | 8.21 |
| Characteristics | |
| Spectral type | G0V[2] |
| Astrometry | |
| Proper motion (μ) | RA: 128.329±0.073[1] mas/yr Dec.: 30.270±0.059[1] mas/yr |
| Parallax (π) | 16.4066 ± 0.0513 mas[1] |
| Distance | 198.8 ± 0.6 ly (61.0 ± 0.2 pc) |
| Details | |
| Mass | 1.16±0.01[3] M☉ |
| Radius | 1.08±0.01[3] R☉ |
| Luminosity | 1.297±0.002[3] L☉ |
| Surface gravity (log g) | 4.42±0.01[3] cgs |
| Temperature | 5919±11[3] K |
| Age | 1.0±0.4[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 68988 is an 8th magnitude G-type star located approximately 200 light-years away in Ursa Major constellation.
The star HD 68988 is named Násti. The name was selected in the NameExoWorlds campaign by Norway, during the 100th anniversary of the IAU. Násti means star in the Northern Sami language.[5][6]
Planetary system
There are two planets: HD 68988 b was discovered in 2002[7] and HD 68988 c was discovered in 2006.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >1.86 ± 0.16 MJ | 0.0704 ± 0.0041 | 6.27711 ± 0.00021 | 0.1249 ± 0.0087 | — | — |
| c | >5–20 MJ | 5–7 | 4000–22000 | ? | — | — |
See also
References
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ van Belle, Gerard T.; von Braun, Kaspar (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal. 694 (2): 1085–1098. arXiv:0901.1206. Bibcode:2009ApJ...694.1085V. doi:10.1088/0004-637X/694/2/1085.
- ^ a b c d e f Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951.
- ^ "HD 68988". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-13.
- ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
- ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
- ^ Vogt, Steven S.; et al. (2002). "Ten Low-Mass Companions from the Keck Precision Velocity Survey". The Astrophysical Journal. 568 (1): 352–362. arXiv:astro-ph/0110378. Bibcode:2002ApJ...568..352V. doi:10.1086/338768.
- ^ a b Wright, J. T.; et al. (2007). "Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars". The Astrophysical Journal. 657 (1): 533–545. arXiv:astro-ph/0611658. Bibcode:2007ApJ...657..533W. doi:10.1086/510553.
- ^ Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701.
External links
- "Notes for star HD 68988". Retrieved 2008-08-25.
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