Delta Doradus
| Observation data Epoch 2000.0 Equinox 2000.0 | |
|---|---|
| Constellation | Dorado |
| Right ascension | 05h 44m 46.42s |
| Declination | −65° 44′ 07.9″ |
| Apparent magnitude (V) | 4.34 |
| Characteristics | |
| Spectral type | A7V |
| U−B color index | 0.12 |
| B−V color index | 0.21 |
| Astrometry | |
| Radial velocity (Rv) | -3 km/s |
| Proper motion (μ) | RA: -28.38 mas/yr Dec.: 6.12 mas/yr |
| Parallax (π) | 22.48 ± 0.46 mas |
| Distance | 145 ± 3 ly (44.5 ± 0.9 pc) |
| Absolute magnitude (MV) | 1.10 |
| Details | |
| Mass | 1.35[1] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
δ Doradus is a faint star in the Dorado constellation that becomes the Moon's south pole star[2] once every 18.6 years. The pole star status changes periodically, because of the precession of the Moon's rotational axis.
When δ Doradus is the pole star, it is better aligned than Earth's Polaris (α Ursae Minoris), but much fainter.
See also
References
- ↑ Shaya, Ed J.; Olling, Rob P. (January 2011), "Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue", The Astrophysical Journal Supplement 192 (1): 2, arXiv:1007.0425, Bibcode:2011ApJS..192....2S, doi:10.1088/0067-0049/192/1/2
- ↑ Patrick Moore (1983), The Guinness Book of Astronomy Facts & Feats, p. 29,
In 1968 the north pole star of the Moon was Omega Draconis; by 1977 it was 36 Draconis. The south pole star is Delta Doradus.
External links
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