# HD 85512

(Redirected from Gliese 370)
Observation data Characteristics Epoch 2000      Equinox 2000 Close-up of the sky around the star HD 85512. Credit: ESO and Digitized Sky Survey 2. Constellation Vela Right ascension 09h 51m 07.1s Declination −43° 30′ 10″ Apparent magnitude (V) 7.66 Spectral type K5 V U−B color index 1.12 B−V color index 1.18 V−R color index 0.71 R−I color index 0.62 Radial velocity (Rv) -9.6 km/s Proper motion (μ) RA: 461.28 mas/yr Dec.: −472.87 mas/yr Parallax (π) 89.75 ± 0.82 mas Distance 36.3 ± 0.3 ly (11.1 ± 0.1 pc) Absolute magnitude (MV) 7.43 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 CD-42 5678, GJ 370, HD 85512, HIP 48331, LHS 2201, NStars 0951-4330, YPC 2340

HD 85512 is a solitary, orange, main-sequence (K5 V) star located approximately 36 light-years away in the constellation Vela. The star 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

Artists's impression of HD 85512 b.[1] 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.[2] 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 system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
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.