W Orionis

W Orionis

The visual band light curve for W Orionis, plotted from ASAS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 05m 23.72142s[2]
Declination +01° 10′ 39.4512″[2]
Apparent magnitude (V) 4.4 - 6.9[3]
Characteristics
Evolutionary stage AGB
Spectral type C-N5 C25.5[4] (C5,4(N5)[5])
U−B color index +6.84[6]
B−V color index +3.42[6]
Variable type SRb[5]
Astrometry
Radial velocity (Rv)+16.50[7] km/s
Proper motion (μ) RA: +7.5[2] mas/yr
Dec.: -1.4[2] mas/yr
Parallax (π)2.65 ± 0.95 mas[2]
Distanceapprox. 1,200 ly
(approx. 400 pc)
Absolute magnitude (MV)−5.76[8]
Details
Mass1-2[9] M☉
Radius406[9] R☉
Luminosity6,761[9] L☉
Surface gravity (log g)−0.60[9] cgs
Temperature2,600[9] K
Metallicity [Fe/H]0.0[9] dex
Other designations
W Ori, BD−00°939, HD 32736, HIP 23680
Database references
SIMBADdata

W Orionis is a carbon star in the constellation Orion, approximately 400 parsecs (1,300 ly) away. It varies regularly in brightness between extremes of magnitude 4.4 and 6.9 roughly every 7 months.

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  2. ^ a b c d e Cite error: The named reference hipparcos was invoked but never defined (see the help page).
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  5. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference ubv was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference rv was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference guandalini was invoked but never defined (see the help page).
  9. ^ a b c d e f Cite error: The named reference cruzalebes2013 was invoked but never defined (see the help page).