| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19 49 33.9667 |
| 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 |
| Distance | 1,010 ± 60 ly (310 ± 20 pc) |
| Absolute magnitude (MV) | 4.00 |
| Details | |
| Mass | 1.189±0.023 M☉ |
| Radius | 1.270±0.066 R☉ |
| Luminosity | 2.298+0.007 −0.006 L☉ |
| Surface gravity (log g) | 4.279±0.041 cgs |
| Temperature | 6,117±27 K |
| Metallicity | +0.12±0.04 dex |
| Rotation | ~21 days |
| Age | 2.747±0.838 Myr |
| Other designations | |
| CD–38°13701, GC 27415, HD 187085, HIP 97546, SAO 211579 | |
| Database references | |
| SIMBAD | data |
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 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. 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.
| 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
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Barbato, D.; et al. (August 2018), "Exploring the realm of scaled solar system analogues with HARPS", Astronomy & Astrophysics, 615: 21, arXiv:1804.08329, Bibcode:2018A&A...615A.175B, doi:10.1051/0004-6361/201832791, S2CID 119099721, A175.
- ^ Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Department of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- "HD 187085". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-09.
- Jones, Hugh R. A.; et al. (2006), "High-eccentricity planets from the Anglo-Australian Planet Search", Monthly Notices of the Royal Astronomical Society, 369 (1): 249–256, arXiv:astro-ph/0603335, Bibcode:2006MNRAS.369..249J, doi:10.1111/j.1365-2966.2006.10298.x, S2CID 15452372.
- Agnew, Matthew T.; et al. (November 2017), "Stable habitable zones of single Jovian planet systems", Monthly Notices of the Royal Astronomical Society, 471 (4): 4494–4507, arXiv:1706.05805, Bibcode:2017MNRAS.471.4494A, doi:10.1093/mnras/stx1449, S2CID 119227856.
- Kóspál, Ágnes; et al. (August 2009), "On the Relationship Between Debris Disks and Planets", The Astrophysical Journal Letters, 700 (2): L73 – L77, arXiv:0907.0028, Bibcode:2009ApJ...700L..73K, doi:10.1088/0004-637X/700/2/L73, S2CID 16636256.
External links
- "Notes for star HD 187085". Extrasolar Planets Encyclopaedia. Archived from the original on July 2, 2007.
