HD 85390

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.

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[1] mas
Distance109.4 ± 0.1 ly
(33.56 ± 0.04 pc)
Absolute magnitude (MV)5.896
Details
Mass0.80 M☉
Radius0.82 ± 0.06 R☉
Luminosity0.431 ± 0.031 L☉
Surface gravity (log g)4.38 cgs
Temperature5170 ± 100 K
Metallicity [Fe/H]–0.07 dex
Other designations
Natasha, CD–49°4727, Gaia DR2 5406324138654973824, HIP 48235, SAO 221526, 2MASS J09500249-4947250[2]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

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]

The HD 85390 planetary system[7]
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
  • List of extrasolar planets

References
  1. 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.
  2. "HD 85390". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-26.
  3. "Approved names". NameExoworlds. Retrieved 2020-01-02.
  4. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  5. 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
  6. 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
  7. 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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