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HD 93385

Star in the constellation Vela From Wikipedia, the free encyclopedia

HD 93385 is a star in the southern constellation of Vela. At an apparent visual magnitude of 7.5,[3] it is too faint to be seen with the unaided eye. Parallax measurements made using the Gaia spacecraft show an annual shift of 23.15 mas. This is equivalent to a physical separation of around 141[2] light years from the Sun. It is drifting further away with a radial velocity of +47.8 km/s.

Quick facts Constellation, Right ascension ...
HD 93385
Observation data
Epoch J2000      Equinox ICRS
Constellation Vela[1]
Right ascension 10h 46m 15.116s[2]
Declination −41° 27′ 51.73″[2]
Apparent magnitude (V) 7.486[3]
Characteristics
Evolutionary stage main sequence[2]
Spectral type G2/G3 V[4]
B−V color index 0.595[5]
Astrometry
Radial velocity (Rv)+47.80±0.61[6] km/s
Proper motion (μ) RA: −48.135 mas/yr[2]
Dec.: −54.551 mas/yr[2]
Parallax (π)23.1489±0.018 mas[2]
Distance140.9 ± 0.1 ly
(43.20 ± 0.03 pc)
Absolute magnitude (MV)+4.37[1]
Details
Mass1.07[5] M☉
Radius1.17[7] R☉
Luminosity1.42[7] L☉
Surface gravity (log g)4.08±0.11[7] cgs
Temperature5,823±35[7] K
Metallicity [Fe/H]−0.05±0.03[7] dex
Age4.13[5] Gyr
Other designations
CD−40°6283, HD 93385, HIP 52676, SAO 222310[8]
Database references
SIMBADdata
Exoplanet Archivedata
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This is an ordinary G-type main sequence star with a stellar classification of G2/G3 V.[4] The physical properties of HD 93385 are similar to those of the Sun; it is slightly larger with 107%[5] of the Sun's mass, 117% of the radius, and 142% of the luminosity. The abundance of elements, other than hydrogen and helium, is nearly the same as in the Sun.[7] It is currently at an unusual low level of surface activity and thus is a candidate Maunder minimum analog.[5]

A physical companion star with an apparent visual magnitude of 12.29 is located at an angular separation of 10.32 arcseconds (equivalent to projected separation of 448 AU) along a position angle of 288°. It is estimated to have 45% of the mass of the Sun.[9] A 2015 survey ruled out the existence of any additional stellar companions at projected distances from 12 to 352 astronomical units.[10]

Planetary system

This star hosts two close-orbiting, super-Earth-like planets, suspected since 2011 and confirmed in 2021.[11][12] The first has 8.3 times the mass of the Earth and an orbital period of 13.186 days. The second is 10.1 times the Earth's mass with a period of 46.025 days.[13] A third planet on an innermost orbit was discovered in 2017[14] and confirmed in 2021.[12]

More information Companion (in order from star), Mass ...
The HD 93385 A planetary system[12]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination
(°)
Radius
b ≥4.2±0.5 M🜨 0.0756±0.0013 7.3426±0.0012 <0.295 — —
c ≥7.1±0.6 M🜨 0.112±0.002 13.180±0.003 <0.20 — —
d ≥8.7±0.9 M🜨 0.2565±0.0043 45.85±0.05 0.09+0.15
−0.05
— —
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