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Delta Crucis
Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Right ascension 12h 15m 8.7s
Declination −58° 44' 56"
Apparent magnitude (V) 2.775
Characteristics
Spectral type B2 IV
U-B color index ?
B-V color index ?
Variable type Beta Cephei
Astrometry
Radial velocity (Rv) +22.2 km/s
Proper motion (μ) RA: -36.68 mas/yr
Dec.: -10.72 mas/yr
Parallax (π) 8.96 ± 0.60 mas
Distance 360 ± 20 ly
(112 ± 7 pc)
Absolute magnitude (MV) -2.47
Details
Mass 8.5 M
Radius 4.9 R
Luminosity 5,600 L
Temperature 22,500 K
Metallicity ?
Rotation < 1.3 days
Age <30 millions years
Other designations
HR 4656, CD -58°4466, CP(D) -58 4189, HD 106490, SAO 239791, FK5 455, HIP 59747.

Delta Crucis (δ Cru / δ Crucis) is a B2IV star in the constellation Crux. It is sometimes called Pálida in Portuguese.[1]

It is of apparent magnitude +2.78 and about 360 light-years from Earth, the faintest of the four bright stars that form the constellation Crux. As a subgiant it has left the stage of a B-dwarf star at the main sequence, is now developing into a Red giant and will one day end as a White dwarf.

Delta Crucis is a Beta Cephei variable and changes its brightness sublty with a period of 1.3 hours. Its rotation ist very fast with a period of less than 1.3 days.

References

External links

  1. ^ da Silva Oliveira, R., "Crux Australis: o Cruzeiro do Sul", Artigos: Planetario Movel Inflavel AsterDomus.
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