Astronomy:HD 192699
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Short description: Star in the constellation Aquila
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquila[1] |
| Right ascension | 20h 16m 06.00378s[2] |
| Declination | +04° 34′ 50.8600″[2] |
| Apparent magnitude (V) | 6.44[1] |
| Characteristics | |
| Evolutionary stage | red giant branch[3][2] |
| Spectral type | G8 IV[4] |
| B−V color index | 0.867±0.006[1] |
| Astrometry | |
| Proper motion (μ) | RA: −40.884[2] mas/yr Dec.: −51.962[2] mas/yr |
| Parallax (π) | 13.7264 ± 0.0290[2] mas |
| Distance | 237.6 ± 0.5 ly (72.9 ± 0.2 pc) |
| Absolute magnitude (MV) | 2.36[1] |
| Details[5] | |
| Mass | 1.26±0.19 M☉ |
| Radius | 4.41±0.21 R☉ |
| Luminosity | 12.26[1] L☉ |
| Surface gravity (log g) | 3.25 cgs |
| Temperature | 5,041 K |
| Metallicity [Fe/H] | −0.12 dex |
| Age | 3.2+1.2 −0.7 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 192699 is a star located approximately 238 light-years away in the constellation of Aquila. It has the apparent magnitude of 6.45. Based on its mass of 1.68 solar, it was an A-type star when it was a main-sequence. In April 2007, a planet was announced orbiting the star, together with HD 175541 b and HD 210702 b.[7]
Although the published spectral class of G8 IV suggests that HD 192699 is a subgiant, models of the star suggest it has reached the base of the red giant branch, having developed a degenerate helium core.[2][3]
The star HD 192699 is named Chechia. The name was selected in the NameExoWorlds campaign by Tunisia, during the 100th anniversary of the IAU. Chechia is a flat-surfaced, traditional red wool hat.[8][9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Khomsa | ≥2.096±0.093 MJ | 1.063±0.049 | 340.94±0.92 | 0.082±0.041 | — | — |
See also
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 Ghezzi, L.; Cunha, K.; Schuler, S. C.; Smith, V. V. (2010), "Metallicities of Planet-hosting Stars: A Sample of Giants and Subgiants", The Astrophysical Journal 725 (1): 721, doi:10.1088/0004-637X/725/1/721, Bibcode: 2010ApJ...725..721G.
- ↑ Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey (Ann Arbor, Michigan: Department of Astronomy, University of Michigan) 5, Bibcode: 1999MSS...C05....0H
- ↑ Brewer, John M. et al. (2016), "Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-Search Stars", The Astrophysical Journal Supplement Series 225 (2): 32, doi:10.3847/0067-0049/225/2/32, Bibcode: 2016ApJS..225...32B.
- ↑ "HD 192263". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+192263.
- ↑ Johnson, John Asher et al. (2007). "Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants". The Astrophysical Journal 665 (1): 785–793. doi:10.1086/519677. Bibcode: 2007ApJ...665..785J.
- ↑ "Approved names" (in en). http://www.nameexoworlds.iau.org/final-results.
- ↑ "International Astronomical Union | IAU". https://www.iau.org/news/pressreleases/detail/iau1912/.
- ↑ Luhn, Jacob K. et al. (2019). "Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts". The Astronomical Journal 157 (4): 149. doi:10.3847/1538-3881/aaf5d0. Bibcode: 2019AJ....157..149L.
External links
- "HIC 99894". webviz.u-strasbg.fr/. http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HIC%2099894.
- "New Words Atlas". planetquest1.jpl.nasa.gov. http://planetquest1.jpl.nasa.gov/atlas/atlas_search.cfm?&Sort=EarthDist&SortDir=DESC.
Coordinates: 
20h 16m 06.0043s, +04° 34′ 50.863″
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