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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]
| 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] |
| Distance | 1,010 ± 60 ly (310 ± 20 pc) |
| Absolute magnitude (MV) | 4.00[4] |
| Details[2] | |
| Mass | 1.189±0.023 M☉ |
| Radius | 1.270±0.066 R☉ |
| Luminosity | 2.298+0.007 −0.006[1] L☉ |
| Surface gravity (log g) | 4.279±0.041 cgs |
| Temperature | 6,117±27 K |
| Metallicity [Fe/H] | +0.12±0.04 dex |
| Rotation | ~21 days |
| Age | 2.747±0.838 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
| 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 |
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