Astronomy:Gamma Reticuli
 | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Reticulum |
| Right ascension | 04h 00m 53.80860s[1] |
| Declination | −62° 09′ 33.4250″[1] |
| Apparent magnitude (V) | 4.5[2] |
| Characteristics | |
| Evolutionary stage | asymptotic giant branch[3] |
| Spectral type | M4 III[4] |
| U−B color index | +1.81[2] |
| B−V color index | +1.66[2] |
| Variable type | SR[5] |
| Astrometry | |
| Radial velocity (Rv) | −7.0±2.7[6] km/s |
| Proper motion (μ) | RA: +3.03[1] mas/yr Dec.: +34.67[1] mas/yr |
| Parallax (π) | 6.95 ± 0.11[1] mas |
| Distance | 469 ± 7 ly (144 ± 2 pc) |
| Absolute magnitude (MV) | −1.31[7] |
| Details | |
| Mass | 1.5−2[5] M☉ |
| Radius | 115[5] R☉ |
| Luminosity | 1,846[8] L☉ |
| Surface gravity (log g) | 0.8[5] cgs |
| Temperature | 3,599[8] K |
| Metallicity [Fe/H] | 0.0[5] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gamma Reticuli (Gamma Ret, γ Reticuli, γ Ret) is a solitary[10] star in the southern constellation of Reticulum. With an apparent visual magnitude of 4.5,[2] it can be faintly seen with the naked eye. Based upon an annual parallax shift of 6.95 mas,[1] it is located roughly 469 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.08 due to interstellar dust.[5]
This is an evolved red giant star, currently on the asymptotic giant branch,[3] with a stellar classification of M4 III.[4] It is a semiregular variable with a period of 25 days.[5] Gamma Reticuli has 1.5−2 times the mass of the Sun, 115 times the Sun's radius,[5] and radiates 1,846 times the solar luminosity from its outer atmosphere at an effective temperature of 3,450 K.[8]
Gamma Reticuli is moving through the Galaxy at a speed of 24.8 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,100 and 39,200 light years from the center of the Galaxy.[12]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M.
- ↑ 3.0 3.1 Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal 104 (1): 275–313, doi:10.1086/116239, Bibcode: 1992AJ....104..275E.
- ↑ 4.0 4.1 Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 Cruzalèbes, P. et al. (September 2013), "Fundamental parameters of 16 late-type stars derived from their angular diameter measured with VLTI/AMBER", Monthly Notices of the Royal Astronomical Society 434 (1): 437–450, doi:10.1093/mnras/stt1037, Bibcode: 2013MNRAS.434..437C.
- ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 8.0 8.1 8.2 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ "gam Ret". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=gam+Ret.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ "/ftp/cats/more/HIP/cdroms/cats". Strasbourg astronomical Data Center. https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats.
- ↑ Gamma Reticuli (HIP 18744)
 |  |
