p Eridani
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Eridanus |
| A | |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.76[2] |
| B | |
| Right ascension | Template:RA[3] |
| Declination | Template:DEC[3] |
| Apparent magnitude (V) | 5.87[2] |
| Characteristics | |
| Spectral type | K2V + K2V[4] |
| U−B Template:Engvar | +0.59 / +0.53[2] |
| B−V Template:Engvar | +0.90 / +0.87[2] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | Script error: No such module "val".[1] km/s |
| Proper motion (μ) | RA: +262.615 mas/yr[1] Dec.: +14.961 mas/yr[1] |
| Parallax (π) | 122.1088±0.0365 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 6.25[5] |
| B | |
| Radial velocity (Rv) | Script error: No such module "val".[3] km/s |
| Proper motion (μ) | RA: +309.230 mas/yr[3] Dec.: +10.815 mas/yr[3] |
| Parallax (π) | 122.0035±0.0319 mas[3] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 6.27[5] |
| Orbit[6] | |
| Period (P) | Script error: No such module "val". yr |
| 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".° |
| Details | |
| p Eri A | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Radius | Script error: No such module "val".[7] Template:Solar radius |
| Luminosity | Script error: No such module "val".[7] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[7] cgs |
| Temperature | Script error: No such module "val".[7] K |
| Metallicity [Fe/H] | –0.24[8] dex |
| Rotation | 30[9] days |
| Age | 4.94[8] Gyr |
| p Eri B | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Radius | Script error: No such module "val".[7] Template:Solar radius |
| Luminosity | Script error: No such module "val".[7] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[7] cgs |
| Temperature | Script error: No such module "val".[7] K |
| Metallicity [Fe/H] | –0.19[8] dex |
| Rotation | 39[9] days |
| Age | 1.96[8] Gyr |
| Other designations | |
| Template:Odlist | |
| p Eri A: Template:Odlist | |
| p Eri B: Template:Odlist | |
| Database references | |
| SIMBAD | data |
| p Eri A | |
| p Eri B | |
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p Eridani is a binary star system in the constellation of Eridanus (the River) whose distance from the Sun is 26.7 light-years based upon parallax. It was found to be a double star in December 1825 by James Dunlop in Australia at his home at Paramatta, now spelt Parramatta. It is visible to the naked eye as a dim, orange-hued star. The system is moving further from the Earth with a heliocentric radial velocity of about Script error: No such module "val"..
This system consists of a pair of near identical K-type main-sequence stars with stellar classifications of K2V.[4] Component A has visual magnitude 5.87, while component B is magnitude 5.76.[2] They orbit each other with a period of 394 years, an eccentricity of 0.576, and a semimajor axis of Script error: No such module "val"..[6]
Naming
The name "p Eridani", according to Nature, p. 589 (19 April 1883)[10] has been "occasionally miscalled 6 Eridani, which would imply that it was one of Flamsteed's stars. Flamsteed, it is true has a star which he calls 6 Eridani. The designated letter 'p' was attached to a star by Lacaille in the catalogue at the end of his Coelum Australe Stelliferum. The number '6' is merely borrowed from Bode."
The use of Bode numbers was commonly used in the early 19th century, but this antiquated system has now fallen into disuse for more than a century.
See also
References
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Further reading
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External links
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