HD 164427
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pavo |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 6.88[2] |
| Characteristics | |
| Spectral type | G0+V[3] |
| B−V Template:Engvar | Script error: No such module "val".[2] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[1] km/s |
| Proper motion (μ) | RA: −196.087[1] mas/yr Dec.: −51.219[1] mas/yr |
| Parallax (π) | 23.4516±0.1836 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | Script error: No such module "val".[4] |
| Orbit[5] | |
| Period (P) | Script error: No such module "val". |
| Semi-major axis (a) | Script error: No such module "val". |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Longitude of the node (Ω) | Script error: No such module "val".° |
| Periastron epoch (T) | Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Details[5] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | Script error: No such module "val". dex |
| Age | Script error: No such module "val".[4] Gyr |
| HD 164427 B | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Mass | Script error: No such module "val". MJup |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[6] | |
| Database references | |
| SIMBAD | data |
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HD 164427 is a star with a likely red dwarf companion in the southern constellation of Pavo. It has an apparent visual magnitude of 6.88,[2] placing it just below the nominal limit for visibility with the typical naked eye. The annual parallax shift of Script error: No such module "val".[1] yields a distance estimate of Script error: No such module "convert".. It is moving further from the Earth with a heliocentric radial velocity of +3.4 km/s.[1]
This is an inactive[7] G-type main-sequence star given a stellar classification of G0+V by Gray et al. (2006),[3] although Evans et al. (1964) classified it as a subgiant star with luminosity class IV.[7] It is 6.6 billion years old with 1.125 times the mass of the Sun and 1.40 times the Sun's radius.[8] The star is somewhat over-luminous for its class,[7] radiating 2.33[2] times the Sun's luminosity from its photosphere at an effective temperature of 5,876 K.[3]
CompanionsScript error: No such module "anchor".
In 2001, a brown dwarf candidate companion was announced by Anglo-Australian Planet Search program. It was detected by the Doppler velocity technique with an echelle spectrograph attached to the 3.92m Anglo-Australian Telescope.[7] A magnitude 12.60 companion star designated HD 164427 B lies at an angular separation of Script error: No such module "val". along a position angle of 336°, as of 2010.[9] This is a suspected common proper motion companion with 52% of the Sun's mass[10] and a physical separation of as much as Script error: No such module "val"..[7]
HD 164427 b was initially thought to be a brown dwarf based on its minimum mass of 46 times that of Jupiter.[7] In 2023, an astrometric orbit for this object was published using data from Gaia, showing its true mass to be Template:Solar mass, making it a likely red dwarf star.[5] This stellar companion orbits at nearly half an astronomical unit or Earth-to-Sun distance away from its primary. The angular separation between the two stars as viewed from Earth is 11.76 milliarcseconds. It takes 108.55 Earth days to orbit eccentrically around HD 164427. It has a very high semi-amplitude of almost 1400 m/s, because this is a very massive object which exerts strong gravitational pull on its tugging star.[7]
References
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- ↑ a b c d e f g h Template:Cite Gaia DR2
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- ↑ Template:Cite simbad
- ↑ a b c d e f g Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
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External links
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