HD 171978
Template:Short description Template:About-distinguish
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Serpens[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | Script error: No such module "val". (A)[3] Script error: No such module "val". (B)[3] 5.74 to 5.86 (AB)[4] |
| Characteristics | |
| Spectral type | A0V[5] |
| U−B Template:Engvar | +0.06[6] |
| B−V Template:Engvar | Script error: No such module "val".[1] |
| R−I Template:Engvar | +0.04[6] |
| Variable type | suspected[4] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[3] km/s |
| Proper motion (μ) | RA: +14.018[2] mas/yr Dec.: −20.710[2] mas/yr |
| Parallax (π) | 6.0774±0.0833 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | Script error: No such module "val". (A)[3] Script error: No such module "val". (B)[3] |
| Orbit[3] | |
| Period (P) | Script error: No such module "val". |
| Eccentricity (e) | 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 |
| Semi-amplitude (K2) (secondary) | Script error: No such module "val". km/s |
| Details[3] | |
| A | |
| Mass | 2.5 Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Rotational velocity (v sin i) | Script error: No such module "val". km/s |
| B | |
| Mass | 2.35 Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Metallicity [Fe/H] | dex |
| Rotational velocity (v sin i) | Script error: No such module "val". km/s |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
HD 171978 is a binary star system in the Serpens Cauda segment of the equatorial constellation of Serpens. It may be referred to by its Bright Star Catalogue identifier of HR 6993. This system is dimly visible to the naked eye with a combined apparent visual magnitude of 5.76,[1] although is a suspected variable star of unknown type with a magnitude that has been reported to vary between 5.74 and 5.86.[4] HD 171978 is located at a distance of approximately 537 light-years from the Sun based on parallax,[2] and is drifting further away with a barycentric radial velocity of +11.4 km/s.[3] It is a member of the Ursa Major Moving Group.[8]
The binary nature of this system was reported by Canadian astronomer R. M. Petrie in 1948.[9] It is a double-lined spectroscopic binary with an orbital period of 14.7 days and an eccentricity (ovalness) of 0.25. The orbital inclination is estimated to be ~30°. The two stars have a magnitude difference of Script error: No such module "val"., which gives respective magnitudes of 6.33 and 6.73. They each show a sharp-lined spectra, indicating their rotation rates are not high. Both are similar A-type main-sequence stars[3] with a combined stellar classification of A0V.[5] In 1970, Geary and Abt noted that the secondary appeared to be an Am star.[8]
References
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- ↑ a b c Script error: No such module "Citation/CS1".
- ↑ a b c d e f Template:Cite Gaia DR2
- ↑ a b c d e f g h i Script error: No such module "Citation/CS1".
- ↑ a b c 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". V/50.
- ↑ Template:Cite simbad
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
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