HD 85512

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HD 85512
HD 85512.jpg
Close-up of the sky around the star HD 85512.
Credit: ESO and Digitized Sky Survey 2.
Observation data
Epoch 2000      Equinox 2000
Constellation Vela
Right ascension 09h 51m 07.1s[1]
Declination −43° 30′ 10″[1]
Apparent magnitude (V) 7.66
Characteristics
Spectral type K5 V
U−B color index 1.12
B−V color index 1.18
V−R color index 0.71
Astrometry
Radial velocity (Rv) -9.6 km/s
Proper motion (μ) RA: 461.92 ± 0.52[1] mas/yr
Dec.: −471.92 ± 0.51[1] mas/yr
Parallax (π) 89.62 ± 0.67[1] mas
Distance 36.4 ± 0.3 ly
(11.16 ± 0.08 pc)
Absolute magnitude (MV) 7.43
Details
Mass 0.69 M
Radius 0.533 ± 0.04[note 1] R
Luminosity (bolometric) 0.126 ± 0.008 L
Surface gravity (log g) 4.39 ± 0.28 cgs
Temperature 4715 ± 102 K
Metallicity 44–50%
Rotation 47.13 ± 6.98
Rotational velocity (v sin i) <3 km/s
Age 5.61 ± 0.61 Gyr
Other designations
CD-42 5678, Gliese 370, HD 85512, HIP 48331, LHS 2201, NStars 0951-4330

HD 85512 is a solitary K-type main-sequence star located approximately 36 light-years away in the constellation Vela. It is approximately one billion years older than the Sun. It is extremely chromospherically inactive, only slightly more active than Tau Ceti. The star is known to host one low-mass planet.

Planetary system[edit]

Artists's impression of HD 85512 b.[2] Credit: ESO/M. Kornmesser.

On August 19, 2011, a ≥3.6 Earth-mass planet was discovered using HARPS that is "just inside" the habitable zone, along with the planets of 82 G. Eridani and HR 7722 c.[3] The planet could be potentially cool enough to host liquid water if the planet exhibits more than 50% cloud coverage. HD 85512 b is currently the fifth best candidate for habitability according to the Habitable Exoplanets Catalog.

The HD 85512 planetary system[3]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b ≥3.6 M 0.26 ± 0.005 58.43 ± 0.13 0.11 ± 0.1

References[edit]

Notes[edit]

  1. ^ From R = \sqrt \frac{L} {4 \pi \sigma T_{\rm eff} ^4}, where R is the radius, L is the luminosity, T_{\rm eff} is the effective surface temperature and \sigma is the Stefan–Boltzmann constant.

External links[edit]

Coordinates: Sky map 09h 51m 07.1s, −43° 30′ 10″