Delta Doradus

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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
Spectral type A7V
U−B color index 0.12
B−V color index 0.21
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
Mass 1.35[1] M
Other designations
HIP 27100, CPD-65° 496, HR 2015, FK5 1154, SAO 249346, HD 39014.
Database references

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[edit]


  1. ^ 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:1007.0425free to read, Bibcode:2011ApJS..192....2S, doi:10.1088/0067-0049/192/1/2 
  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[edit]