HD 187085

HD 187085
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 19h 49m 33.9667s
Declination −37° 46′ 49.981″
Apparent magnitude (V) +7.225
Characteristics
Spectral type G0V
B−V color index 0.622±0.007
Astrometry
Radial velocity (Rv)+17.70±0.59 km/s
Proper motion (μ) RA: −2.853±0.344 mas/yr
Dec.: +8.514±0.363 mas/yr
Parallax (π)3.2263 ± 0.1847 mas
Distance1,010 ± 60 ly
(310 ± 20 pc)
Absolute magnitude (MV)4.00
Details
Mass1.189±0.023 M
Radius1.270±0.066 R
Luminosity2.298+0.007
−0.006
 L
Surface gravity (log g)4.279±0.041 cgs
Temperature6,117±27 K
Metallicity [Fe/H]+0.12±0.04 dex
Rotation~21 days
Age2.747±0.838 Myr
Other designations
CD–38°13701, GC 27415, HD 187085, HIP 97546, SAO 211579
Database references
SIMBADdata

HD 187085 is a yellow–hued star in the southern constellation of Sagittarius. It is too faint to be visible to the naked eye, having an apparent visual magnitude of +7.225. The star is located at a distance of approximately 1,010 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +18 km/s.

This is an ordinary G-type main-sequence star with a stellar classification of G0V, which means it is generating energy through core hydrogen fusion. It is younger than our Sun with an estimated age of 2.7 billion years and is spinning with a leisurely rotation period of around 21 days. The star is 27% larger and 19% more massive than the Sun. It is radiating 2.3 times the luminosity of the Sun from its photosphere at an effective temperature of 6,117 K.

In 2006, an extrasolar planet was announced orbiting HD 187085, with a minimum mass slightly below that of the planet Jupiter. It is orbiting the host star with a period of around 2.8 years. The orbit overlaps the habitable zone of this star. In 2009, the presence of an infrared excess was announced, suggesting a debris disk orbits the star.

The HD 187085 planetary system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b ≥0.836±0.011 MJ 2.100±0.032 1,019.74+21.29
−22.58
0.251+0.221
−0.191

See also


This page was last updated at 2022-10-22 14:12 UTC. Update now. View original page.

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