HD 183263 is a star with a pair of orbiting exoplanets located in the equatorial constellation of Aquila. It has an apparent visual magnitude of 7.86,[2] which is too faint to be visible to the naked eye. The distance to this system is 178 light years based on parallax measurements, but it is drifting closer with a heliocentric radial velocity of −50 km/s.[4] Judging from its motion through space, this star is predicted to approach to within 32 light-years of the Sun in around 952,000 years.[8] At that distance, it will be faintly visible to the naked eye.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 28m 24.571367s[1] |
| Declination | +08° 21′ 29.004523″[1] |
| Apparent magnitude (V) | 7.86[2] |
| Characteristics | |
| Spectral type | G2 IV[3] |
| B−V color index | 0.678±0.012[2] |
| Astrometry | |
| Radial velocity (Rv) | −50.377±0.0005[4] km/s |
| Proper motion (μ) | RA: −18.947±0.021 mas/yr[1] Dec.: −32.190±0.017 mas/yr[1] |
| Parallax (π) | 18.3425 ± 0.0206 mas[1] |
| Distance | 177.8 ± 0.2 ly (54.52 ± 0.06 pc) |
| Absolute magnitude (MV) | 4.16[2] |
| Details[5] | |
| Mass | 1.121±0.052 M☉ |
| Radius | 1.117±0.038 R☉ |
| Luminosity | 2.04[2] L☉ |
| Surface gravity (log g) | 4.403±0.060 cgs |
| Temperature | 5,936±44 K |
| Metallicity [Fe/H] | 0.302±0.030 dex |
| Rotation | 32 days[6] |
| Rotational velocity (v sin i) | 1.56±0.50 km/s |
| Age | 8.1[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
This is an older star with a spectrum matching a stellar classification of G2 IV,[3] indicating it is about to leave the main sequence[6] after exhausting the supply of hydrogen at its core. It will then evolve into a red giant before dying as a white dwarf. This star has an absolute magnitude (apparent magnitude at 10 pc) of 4.16 compared to the Sun’s 4.83, which indicates the star is more luminous than the Sun, and therefore hotter by about 100 K. At the age of 8.1 billion years, the magnetic activity in its chromosphere is quiet and it is spinning slowly with a rotation period of 32 days.[6]
Planetary system
The star has two known super-jovian exoplanets in orbit around it. Exoplanet b was discovered in 2005[6] while exoplanet c was discovered in 2008.[9] A 2022 study estimated the true mass of HD 183263 c at about 9.31 MJ via astrometry, although this estimate is poorly constrained.[10]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥ 3.635±0.034 MJ | 1.486±0.023 | 625.10±0.34 | 0.3728±0.0065 | — | — |
| c | ≥ 6.90±0.12 MJ | 5.69±0.11 | 4684±71 | 0.051±0.010 | — | — |
See also
References
External links
- "Image HD 183263". Simbad.