HD 192699
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquila |
| Right ascension | 20h 16m 06.0043s |
| Declination | +04° 34′ 50.863″ |
| Apparent magnitude (V) | 6.449 |
| Characteristics | |
| Spectral type | G8IV |
| B−V color index | 0.86 ± 0.015 |
| Astrometry | |
| Proper motion (μ) | RA: -40.72 ± 0.83 mas/yr Dec.: -51.16 ± 0.7 mas/yr |
| Parallax (π) | 14.84 ± 0.91 mas |
| Distance | 220 ± 10 ly (67 ± 4 pc) |
| Absolute magnitude (MV) | 2.306 |
| Details | |
| Mass | 1.68 ± 0.12 M☉ |
| Radius | 4.25 ± 0.51 R☉ |
| Surface gravity (log g) | 3.66 ± temperature=5220 ± 44 |
| Metallicity | [Fe/H] = -0.15 ± 0.04 |
| Age | (1.8 ± 1)×109 years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia |
data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
HD 192699 is a yellow subgiant star located approximately 220 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. We report precision Doppler measurements of three intermediate-mass subgiants from Lick and Keck Observatories in Mount Hamilton (California) and Mauna Kea (Hawai'i), USA. All three stars show variability in their radial velocities consistent with planet-mass companions in Keplerian orbits. In April 2007, a planet was announced orbiting the star, together with HD 175541 b and HD 210702 b.[1]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| b | >2.5 MJ | 1.16 | 351.5 ± 6 | 0.149 ± 0.06 |
[edit] See also
[edit] References
- ^ a b Johnson et al.; Fischer, Debra A.; Marcy, Geoffrey W.; Wright, Jason T.; Driscoll, Peter; Butler, R. Paul; Hekker, Saskia; Reffert, Sabine et al (2007). "Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants". The Astrophysical Journal 665 (1): 785–793. Bibcode 2007ApJ...665..785J. doi:10.1086/519677. http://www.iop.org/EJ/article/0004-637X/665/1/785/71436.html.
[edit] External links
- "HIC 99894". http://webviz.u-strasbg.fr/. http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HIC%2099894.
- "New Words Atlas". http://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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