HD 166724
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 18h 13m 59.676s[1] |
| Declination | –42° 34′ 31.35″[1] |
| Apparent magnitude (V) | +9.33 |
| Characteristics | |
| Spectral type | K0IV |
| Astrometry | |
| Proper motion (μ) | RA: 36.60 ± 1.59[1] mas/yr Dec.: –78.62 ± 0.99[1] mas/yr |
| Parallax (π) | 23.63 ± 1.21[1] mas |
| Distance | 138 ± 7 ly (42 ± 2 pc) |
| Details | |
| Mass | 0.81 ± 0.02 M☉ |
| Radius | 0.81 ± 0.02 R☉ |
| Luminosity | 0.31 L☉ |
| Surface gravity (log g) | 4.41 ± 0.04 cgs |
| Temperature | 5362 ± 29 K |
| Metallicity [Fe/H] | –0.09 ± 0.03 dex |
| Age | 4.0 ± 3.8 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 166724 is a K-class dwarf star.
Planetary system
From 1998 to 2012, the star was under observance 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.
The discoverers noted that HD 166724 b is among "the three most eccentric planets with a period larger than 5 years" alongside HD 98649 b and HD 219077 b; but unlike them, too dim as a candidate for direct imaging with current technology. The reason for this eccentricity is unknown.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >3.53 ± 0.11 MJ | 5.42 ± 0.43 | 5144+705 −467 |
0.734 ± 0.020 | — | — |
gollark: What might be interesting is completely departing from the whole "sequentially executing C-like code as fast as possible" thing. Though I guess that's... basically GPUs now?
gollark: I mean, that's... two architectures, and IIRC they're bad in different ways.
gollark: I expected to basically just use it for portably accessing stuff at home, but it turns out that most of my workloads run fine on this and my desktop's GPU was (still is, but I replaced it with a much worse one so I could use it workingly as a server) a bit broken so I use it for most stuff now.
gollark: The main issue is that I did not buy enough RAM for it, and the screen is bad.
gollark: That's an infinity percent return on investment.
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
- 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_166724_b".
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