HD 164712
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Apus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.86[2] |
| Characteristics | |
| Evolutionary stage | red giant branch[3] |
| Spectral type | K2 III[4] |
| U−B Template:Engvar | +1.43[5] |
| B−V Template:Engvar | +1.24[5] |
| Astrometry | |
| Radial velocity (Rv) | 14.8±3.2[6] km/s |
| Proper motion (μ) | RA: +16.16 mas/yr[1] Dec.: -296.819 mas/yr[1] |
| Parallax (π) | 14.2681±0.0440 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +1.48[2] |
| Details | |
| Mass | 1.15[7] Template:Solar mass |
| Radius | 9.09[8] Template:Solar radius |
| Luminosity | 33.1Script error: No such module "Su".[9] Template:Solar luminosity |
| Surface gravity (log g) | 2.55[7] cgs |
| Temperature | 4,360±90[9] K |
| Metallicity [Fe/H] | +0.24[10] dex |
| Rotational velocity (v sin i) | <1.5[11] km/s |
| Age | 4.54Script error: No such module "Su".[3] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[12] | |
| Database references | |
| SIMBAD | data |
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HD 164712, also known as HR 6731 is an orange hued star located in the southern constellation of Apus. It has an apparent magnitude of 5.86,[2] making it faintly visible to the naked eye if viewed under ideal conditions. Parallax measurements place the object at a distance of Script error: No such module "convert".,[1] and it is currently receding with a heliocentric radial velocity of Script error: No such module "val"..[6]
HD 164712 has a stellar classification of K2 III, indicating that it is a red giant. David Stanley Evans gave it a slightly cooler class of K3 III.[13] Gaia Data Release 3 models place it on the bump of red giant branch, a period of temporary contraction.[3] At present it has 1.15 times the mass of the Sun[7] but at an age of 4.54 billion years,[3] it has expanded to 9.09 times its girth.[8] It shines with a luminosity of Script error: No such module "val". from its enlarged photosphere at an effective temperature of Script error: No such module "val"..[9] HD 164712 is a thick disk star with an iron abundance 73% above solar level.[10] This makes it metal enriched. Like most giants, it spins slowly, with its projected rotational velocity being lower than Script error: No such module "val"..[11]
HR 6731 has two faint companions. Component B is a 13th magnitude object separated Script error: No such module "val". away along a position angle of 299°.[14] Component C is a 14th magnitude star Script error: No such module "val". away along a position angle of 109°.[14] The first one is a background object while the other one appears to be physically related.[14] As for HD 164712, it shows indications of an infrared excess, suggesting there may be a dusty disk in orbit around the star.[15][16]
References
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