HD 220689
The survey in 2015 have ruled out the existence of any additional stellar companions at projected distances from 26 to 305 astronomical units.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 25m 52.992s[1] |
| Declination | –20° 36′ 57.71″[1] |
| Apparent magnitude (V) | +7.74 |
| Characteristics | |
| Spectral type | G3V |
| Astrometry | |
| Proper motion (μ) | RA: –15.48 ± 0.72[1] mas/yr Dec.: –179.33 ± 0.64[1] mas/yr |
| Parallax (π) | 22.44 ± 0.70[1] mas |
| Distance | 145 ± 5 ly (45 ± 1 pc) |
| Details | |
| Mass | 1.04 ± 0.03 M☉ |
| Radius | 1.07 ± 0.04 R☉ |
| Luminosity | 1.24 L☉ |
| Surface gravity (log g) | 4.32 ± 0.03 cgs |
| Temperature | 5921 ± 26 K |
| Metallicity [Fe/H] | 0.0 ± 0.03 dex |
| Age | 3.5 ± 1.9 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 220689 is a G-class yellow dwarf star.
Planetary system
From 1998 to 2012, the star was under observation from the CORALIE echelle spectrograph at La Silla Observatory.
In 2012, a long-period, wide-orbiting planet was deduced by radial velocity. This was published in November.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >1.06 ± 0.09 MJ | 3.36 ± 0.09 | 2209+103 −81 |
0.16+.1 −.07 |
— | — |
gollark: You can do ternary logic and such (3 values), but there's no real advantage to it.
gollark: Wow, I guess none are safe.
gollark: Just buy any SBC then.
gollark: Continue adding Ms until someone realizes how silly it is.
gollark: The solution is accelerationism.
References
- van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
- Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 450 (3). doi:10.1093/mnras/stv771. Retrieved 19 June 2020.
- Marmier, M.; et al. (2013). "The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets". Astronomy and Astrophysics. 551. A90. arXiv:1211.6444. Bibcode:2013A&A...551A..90M. doi:10.1051/0004-6361/201219639.
- "hd_220689_b".
External links
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