Lambda Pictoris
λ Pictoris, Latinised as Lambda Pictoris, is a solitary,[7] orange-hued star in the southern constellation of Pictor. It is visible to the naked eye, having an apparent visual magnitude of +5.29.[2] With an annual parallax shift of 8.71[1] mas as seen from the Earth, it is located around 374 light years from the Sun. At the estimated age of 2.24[4] billion years old, it is an evolved K-type giant star with a stellar classification of K0/1 III.[3] Lambda Pictoris has 2.2 times the mass of the Sun and is radiating 112 times the Sun's luminosity from its photosphere at an effective temperature of 4,581 K.[4]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pictor |
| Right ascension | 04h 42m 46.42350s[1] |
| Declination | −50° 28′ 52.8050″[1] |
| Apparent magnitude (V) | +5.29[2] |
| Characteristics | |
| Spectral type | K0/1 III[3] |
| U−B color index | +0.74[2] |
| B−V color index | +0.98[2] |
| Astrometry | |
| Radial velocity (Rv) | +4.60[4] km/s |
| Proper motion (μ) | RA: −36.02[1] mas/yr Dec.: mas/yr |
| Parallax (π) | 8.71 ± 0.18[1] mas |
| Distance | 374 ± 8 ly (115 ± 2 pc) |
| Details | |
| Mass | 2.20[4] M☉ |
| Luminosity | 112[4] L☉ |
| Surface gravity (log g) | 2.77±0.09[5] cgs |
| Temperature | 4,851±45[4] K |
| Metallicity [Fe/H] | −0.13±0.03[5] dex |
| Age | 2.24[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
- van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
- Cousins, A. W. J.; et al. (1969), "Comparison Stars for Long Period Variables", Monthly Notes of the Astronomical Society of Southern Africa, 28: 63, Bibcode:1969MNSSA..28...63C.
- Houk, Nancy (1978), "Michigan catalogue of two-dimensional spectral types for the HD stars", Ann Arbor : Dept. Of Astronomy, Ann Arbor: Dept. of Astronomy, University of Michigan, 2, Bibcode:1978mcts.book.....H.
- Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3): 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88.
- Alves, S.; et al. (April 2015), "Determination of the spectroscopic stellar parameters for 257 field giant stars", Monthly Notices of the Royal Astronomical Society, 448 (3): 2749–2765, arXiv:1503.02556, Bibcode:2015MNRAS.448.2749A, doi:10.1093/mnras/stv189.
- "lam Pic". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-21.
- Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
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