HD 85390
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Vela |
| Right ascension | 09h 50m 02.4969s[1] |
| Declination | –49° 47′ 24.9576″[1] |
| Apparent magnitude (V) | 8.55 |
| Characteristics | |
| Spectral type | K1.5V |
| Apparent magnitude (B) | 9.40 |
| Apparent magnitude (J) | 7.012 |
| Apparent magnitude (H) | 6.612 |
| Apparent magnitude (K) | 6.491 |
| B−V color index | 0.85 |
| Astrometry | |
| Radial velocity (Rv) | 32.5 km/s |
| Proper motion (μ) | RA: 29.8018 ± 0.0379[1] mas/yr Dec.: –60.245 ± 0.058[1] mas/yr |
| Parallax (π) | 29.8018 ± 0.0379 mas[1] |
| Distance | 109.4 ± 0.1 ly (33.56 ± 0.04 pc) |
| Absolute magnitude (MV) | 5.896 |
| Details | |
| Mass | 0.80 M☉ |
| Radius | 0.82 ± 0.06 R☉ |
| Luminosity | 0.431 ± 0.031 L☉ |
| Surface gravity (log g) | 4.38 cgs |
| Temperature | 5170 ± 100 K |
| Metallicity [Fe/H] | –0.07 dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 85390 is a main sequence star of spectral class K1 located approximately 109 light years away[1] in the constellation Vela, appearing as 8.55 magnitude star. This star is smaller, cooler, dimmer, and less massive than our Sun. Also its metal content is seven-sixths as much as the Sun. In 2009, a planet with a minimum mass of about 1/7 of Jupiter's was found in orbit around the star.
The star HD 85390 is named Natasha. The name was selected in the NameExoWorlds campaign by Zambia, during the 100th anniversary of the IAU. Natasha means thank you in many languages of Zambia.[3][4]
Planetary system
The planet b as detected by radial velocity method in 2011. An additional planet in the system was suspected since 2013,[5] only to be refuted in 2019.[6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (Madalitso) | ≥42.0 ± 3.6 M🜨 | 1.52 ± 0.04 | 788 ± 25 | 0.41 ± 0.12 | — | — |
See also
References
- ^ a b c d e f 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.
- ^ "HD 85390". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-26.
- ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
- ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
- ^ Wittenmyer, Robert A.; Wang, Songhu; Horner, Jonathan; Tinney, C. G.; Butler, R. P.; Jones, H. R. A.; O'Toole, S. J.; Bailey, J.; Carter, B. D.; Salter, G. S.; Wright, D.; Zhou, Ji-Lin (2013), "Forever alone? Testing single eccentric planetary systems for multiple companions", The Astrophysical Journal Supplement Series, 208 (1): 2, arXiv:1307.0894, Bibcode:2013ApJS..208....2W, doi:10.1088/0067-0049/208/1/2, S2CID 14109907
- ^ Wittenmyer, Robert A.; Clark, Jake T.; Zhao, Jinglin; Horner, Jonathan; Wang, Songhu; Johns, Daniel (2019), "Truly eccentric. I. Revisiting eight single-eccentric planetary systems", Monthly Notices of the Royal Astronomical Society, 484 (4): 5859–5867, arXiv:1901.08471, Bibcode:2019MNRAS.484.5859W, doi:10.1093/mnras/stz290, S2CID 118915974
{{citation}}: CS1 maint: unflagged free DOI (link) - ^ Mordasini, C.; et al. (2011). "The HARPS search for southern extrasolar planets XXIV. Companions to HD 85390, HD 90156, and HD 103197: a Neptune analog and two intermediate-mass planets". Astronomy and Astrophysics. 526. A111. arXiv:1010.0856. Bibcode:2011A&A...526A.111M. doi:10.1051/0004-6361/200913521.
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