Epsilon Normae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Norma |
| Right ascension | 16h 27m 11.03611s [1] |
| Declination | −47° 33′ 17.2226″ [1] |
| Apparent magnitude (V) | 4.52[1] |
| Characteristics | |
| Spectral type | B3V + B3V + B9V[2] |
| U−B color index | -0.54[3] |
| B−V color index | -0.07[3] |
| Astrometry | |
| Radial velocity (Rv) | -12.50 ± 2.7[1] km/s |
| Proper motion (μ) | RA: -13.68 ± 0.27[4] mas/yr Dec.: -19.89 ± 0.20[4] mas/yr |
| Parallax (π) | 6.15 ± 0.28[4] mas |
| Distance | 530 ± 20 ly (163 ± 7 pc) |
| Other designations | |
| Database references | |
| SIMBAD | data |
Epsilon Normae (ε Nor) is a star in the constellation Norma. Its apparent magnitude is 4.52.[1] It is a spectroscopic binary, with two B-type main sequence stars of spectral type B3V, of almost equal mass orbiting each other every 3.26 days. There is a third star separated by 22 arcseconds, which has a magnitude of 7.5 and is likely a smaller B-type main sequence star of spectral type B9V.[2]
References
- 1 2 3 4 5 6 SIMBAD, Epsilon Normae (accessed 22 December 2012)
- 1 2 Pourbaix, D.; Tokovinin, A.A.; Batten, A.H.; Fekel, F.C.; Hartkopf, W.I.; Levato, H.; Morell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits". Astronomy & Astrophysics. 424: 727–732. Bibcode:2009yCat....102020P. doi:10.1051/0004-6361:20041213.
- 1 2 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4. Bibcode:1966CoLPL...4...99J.
- 1 2 3 van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics. 474 (2): 653–64. Bibcode:2007A&A...474..653V. arXiv:0708.1752
. doi:10.1051/0004-6361:20078357.
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