HD 187085

HD 187085
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 19h 49m 33.9667s[1]
Declination −37° 46′ 49.981″[1]
Apparent magnitude (V) +7.225[2]
Characteristics
Spectral type G0V[3]
B−V color index 0.622±0.007[2]
Astrometry
Radial velocity (Rv)+17.70±0.59[4] km/s
Proper motion (μ) RA: −2.853±0.344[1] mas/yr
Dec.: +8.514±0.363[1] mas/yr
Parallax (π)3.2263 ± 0.1847 mas[1]
Distance1,010 ± 60 ly
(310 ± 20 pc)
Absolute magnitude (MV)4.00[4]
Details[2]
Mass1.189±0.023 M☉
Radius1.270±0.066 R☉
Luminosity2.298+0.007
−0.006[1] 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[5]
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.[2] The star is located at a distance of approximately 1,010 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +18 km/s.[4]

This is an ordinary G-type main-sequence star with a stellar classification of G0V,[3] which means it is generating energy through core hydrogen fusion. It is younger than the 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.[2] It is radiating 2.3[1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,117 K.[2]

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.[6] The orbit overlaps the habitable zone of this star.[7] In 2009, the presence of an infrared excess was announced, suggesting a debris disk orbits the star.[8]

The HD 187085 planetary system[2]
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 		— —
  1. ^ a b c d e f g h Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Barbato2018 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Jones2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Agnew2017 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Kóspál2009 was invoked but never defined (see the help page).