HD 179791
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 6.48[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | A3 V[5] |
| U−B Template:Engvar | +0.10[3] |
| B−V Template:Engvar | +0.09[3] |
| Variable type | suspected[6] |
| Astrometry | |
| Radial velocity (Rv) | +16.2[7] km/s |
| Proper motion (μ) | RA: +6.819[2] mas/yr Dec.: −9.809[2] mas/yr |
| Parallax (π) | 5.2966±0.0569 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 0.66[1] |
| Details | |
| Mass | Script error: No such module "val".[4] Template:Solar mass |
| Radius | 2.5[8] Template:Solar radius |
| Luminosity | Script error: No such module "val".[4] Template:Solar luminosity |
| Temperature | Script error: No such module "val".[4] K |
| Rotational velocity (v sin i) | 196[4] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[9] | |
| Database references | |
| SIMBAD | data |
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HD 179791 is suspected variable star[6] in the equatorial constellation of Aquila. It is a challenge to see with the naked eye even under good viewing conditions, having an apparent visual magnitude of 6.48.[3] The distance to HD 179791 can be estimated from its annual parallax shift of Script error: No such module "val".,[2] which yields a value of 616 light years. It is moving further from the Earth with a heliocentric radial velocity of +16 km/s.[7] Astrometric measurements of the star show changes in motion that may indicate it is a member of a close binary system.[10]
This is an A-type main-sequence star with a stellar classification of A3 V.[5] It is a suspected chemically peculiar star and formerly a candidate Lambda Boötis star.[11] The status as a Lambda Boötis star was reviewed and changed to non-member in 2015.[12] It is spinning rapidly with a projected rotational velocity of 196 km/s.[4] The star has 2.55[4] times the mass of the Sun and about 2.5[8] times the Sun's radius. It is radiating 66[4] times the Sun's luminosity from its photosphere at an effective temperature of 8,912 K.[4]
References
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- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c d e f Template:Cite DR2
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- ↑ a b c d e f g h i Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
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- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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