Zeta Normae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Norma |
| Right ascension | 16h 13m 22.69800s[1] |
| Declination | −55° 32′ 27.4108″[1] |
| Apparent magnitude (V) | 5.81[2] |
| Characteristics | |
| Spectral type | F2 III[3] |
| B−V color index | +0.34[2] |
| Astrometry | |
| Radial velocity (Rv) | −45.6±4.3[4] km/s |
| Proper motion (μ) | RA: −98.850[1] mas/yr Dec.: −42.066[1] mas/yr |
| Parallax (π) | 14.2047 ± 0.0771 mas[1] |
| Distance | 230 ± 1 ly (70.4 ± 0.4 pc) |
| Absolute magnitude (MV) | 1.67[5] |
| Details | |
| Mass | 1.74[6] M☉ |
| Radius | 3.23+0.20 −0.06[1] R☉ |
| Luminosity | 19.434±0.133[1] L☉ |
| Surface gravity (log g) | 3.70[6] cgs |
| Temperature | 6,743+69 −200[1] K |
| Metallicity [Fe/H] | −0.21[6] dex |
| Age | 1.50[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Zeta Normae, Latinised from ζ Normae, is a solitary,[3] yellow-white hued star in the southern constellation of Norma. With an apparent visual magnitude of 5.81,[2] it is a dim star near the lower limit of visibility for the naked eye. Based upon an annual parallax shift of 14.2 mas as seen from Earth,[1] this system is located approximately 230 light years from the Sun. It is advancing in the general direction of the Sun with a radial velocity of −45.6 km/s.[4]
This is an evolved F-type giant star with a stellar classification of F2 III[3] that has swollen and cooled off the main sequence after consuming the hydrogen at its core. It is an estimated 1.5 billion years old with 1.74 times the mass of the Sun[6] and 3.2 times the Sun's radius.[1] Zeta Normae is radiating approximately 19 times the Sun's luminosity from its photosphere at an effective temperature of 6,743 K.[1]
References[edit]
- ^ a b c d e f g h i j k Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ a b c 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, S2CID 14878976.
- ^ a b 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ 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 c d e Casagrande, L.; et al. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics, 530 (A138): 21, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
- ^ "zet Nor". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-12.
