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P Eridani
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Eridanus |
| A | |
| Right ascension | 01h 39m 47.813s[1] |
| Declination | −56° 11′ 35.94″[1] |
| Apparent magnitude (V) | 5.76[2] |
| B | |
| Right ascension | 01h 39m 47.565s[3] |
| Declination | −56° 11′ 47.21″[3] |
| Apparent magnitude (V) | 5.87[2] |
| Characteristics | |
| Spectral type | K2V + K2V[4] |
| U−B color index | +0.59 / +0.53[2] |
| B−V color index | +0.90 / +0.87[2] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | +21.74±0.12[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 | 26.710 ± 0.008 ly (8.189 ± 0.002 pc) |
| Absolute magnitude (MV) | 6.25[5] |
| B | |
| Radial velocity (Rv) | +20.15±0.12[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 | 26.733 ± 0.007 ly (8.196 ± 0.002 pc) |
| Absolute magnitude (MV) | 6.27[5] |
| Orbit[6] | |
| Period (P) | 394±23 yr |
| Semi-major axis (a) | 7.24±0.26″ |
| Eccentricity (e) | 0.576±0.063 |
| Inclination (i) | 141±4° |
| Longitude of the node (Ω) | 6.8±7.9° |
| Periastron epoch (T) | 1817±6 |
| Argument of periastron (ω) (secondary) | 360±10° |
| Details | |
| p Eri A | |
| Mass | 0.77+0.04 −0.03[7] M☉ |
| Radius | 0.76±0.02[7] R☉ |
| Luminosity | 0.34±0.02[7] L☉ |
| Surface gravity (log g) | 4.60±0.05[7] cgs |
| Temperature | 5,046+43 −40[7] K |
| Metallicity [Fe/H] | –0.24[8] dex |
| Rotation | 30[9] days |
| Age | 4.94[8] Gyr |
| p Eri B | |
| Mass | 0.76+0.04 −0.02[7] M☉ |
| Radius | 0.72+0.01 −0.02[7] R☉ |
| Luminosity | 0.31±0.02[7] L☉ |
| Surface gravity (log g) | 4.630±0.060[7] cgs |
| Temperature | 5,076±43[7] K |
| Metallicity [Fe/H] | –0.19[8] dex |
| Rotation | 39[9] days |
| Age | 1.96[8] Gyr |
| Other designations | |
| DUN 5, p Eri, CD−56°328, GJ 66, HIP 7751, SAO 232490, WDS 01398-5612 | |
| p Eri A: HD 10360, HR 486, LTT 903 | |
| p Eri B: HD 10361, HR 487, LTT 902 | |
| Database references | |
| SIMBAD | data |
| p Eri A | |
| p Eri B | |
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 +20 km/s.
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 7.24″.[6]
Naming
[edit]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. The Flamsteed designation 6 Eridani refers to a different star.[11]
See also
[edit]References
[edit]- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e Hoffleit, D.; Jaschek, C. (1991), The Bright star catalogue, New Haven: Yale University Observatory, Bibcode:1991bsc..book.....H.
- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Gray, R. O.; et al. (2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
- ^ a b Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511.
- ^ a b Izmailov, Igor; Khovritchev, Maxim (January 2025), "New Orbital Parameters of 850 Wide Visual Binary Stars and Their Statistical Properties", Research in Astronomy and Astrophysics, 25 (1): 015016, Bibcode:2025RAA....25a5016I, doi:10.1088/1674-4527/ad9da3, ISSN 1674-4527.
- ^ a b c d e f g h i j Harada, Caleb K.; et al. (June 2024), "Setting the Stage for the Search for Life with the Habitable Worlds Observatory: Properties of 164 Promising Planet-survey Targets", The Astrophysical Journal Supplement Series, 272 (2), id. 30, arXiv:2401.03047, Bibcode:2024ApJS..272...30H, doi:10.3847/1538-4365/ad3e81.
- ^ a b c d Aguilera-Gómez, Claudia; Ramírez, Iván; Chanamé, Julio (2018), "Lithium abundance patterns of late-F stars: An in-depth analysis of the lithium desert", Astronomy and Astrophysics, 614: A55, arXiv:1803.05922, Bibcode:2018A&A...614A..55A, doi:10.1051/0004-6361/201732209, S2CID 62799777.
- ^ a b Saar, S. H.; et al. (February 1997), "Rotation, turbulence and evidence for magnetic fields in southern dwarfs", Monthly Notices of the Royal Astronomical Society, 284 (4): 803–810, Bibcode:1997MNRAS.284..803S, doi:10.1093/mnras/284.4.803
- ^ "Our Astronomical Column: The Binary Star p Eridani" (PDF), Nature: 589, 19 April 1883, retrieved 2019-05-27.
- ^ "* 6 Eri". SIMBAD. Centre de données astronomiques de Strasbourg.
Further reading
[edit]- Maldonado, J.; et al. (October 2010). "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups". Astronomy and Astrophysics. 521: A12. arXiv:1007.1132. Bibcode:2010A&A...521A..12M. doi:10.1051/0004-6361/201014948. S2CID 119209183.
External links
[edit]- "p Eridani 3?". SolStation. Retrieved 2008-06-21.
