CW Leonis

CW Leonis

CW Leonis in ultraviolet showing the bowshock
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 09h 47m 57.406s[1]
Declination +13° 16′ 43.56″[1]
Apparent magnitude (V) 14.5 (var.)[2]
Characteristics
Spectral type C9,5e[3]
Apparent magnitude (R) 10.96[1]
Apparent magnitude (J) 7.34[1]
Apparent magnitude (H) 4.04[1]
Apparent magnitude (K) 1.19[1]
Variable type Mira[4]
Astrometry
Proper motion (μ) RA: 35±1 mas/yr
Dec.: 12±1[5] mas/yr
Parallax (π)10.56 ± 2.02 mas[6]
Distanceapprox. 310 ly
(approx. 90 pc)
Details
Mass0.7 - 0.9[5] M☉
Radius560[7] R☉
Luminosity8,500 (average), 11,850 (maximum)[7] L☉
Temperature2,300[7] (1,915 - 2,105)[8] K
Other designations
CW Leo, Peanut Nebula, IRC+10216, IRAS 09452+1330, PK 221+45 1, Zel 0945+135, RAFGL 1381, 2MASS J09475740+1316435, SCM 50[9]
Database references
SIMBADdata

CW Leonis or IRC +10216 is a variable carbon star that is embedded in a thick dust envelope. It was first discovered in 1969 by a group of astronomers led by Eric Becklin, based upon infrared observations made with the 62-inch Caltech Infrared Telescope at Mount Wilson Observatory. Its energy is emitted mostly at infrared wavelengths. At a wavelength of 5 μm, it was found to have the highest flux of any object outside the Solar System.[10]

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