S Crucis

S Crucis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Crux
Right ascension 12h 54m 21.99728s[1]
Declination −58° 25′ 50.2146″[1]
Apparent magnitude (V) 6.22 - 6.92[2]
Characteristics
Spectral type F6-G1Ib-II[2]
Variable type δ Cep[2]
Astrometry
Radial velocity (Rv)−6.10[3] (−21.1 - 5.9)[4] km/s
Proper motion (μ) RA: −9.480[1] mas/yr
Dec.: 3.987[1] mas/yr
Parallax (π)1.0215 ± 0.0448 mas[1]
Distance3,200 ± 100 ly
(980 ± 40 pc)
Absolute magnitude (MV)-3.27[5]
Details
Radius37.9[6] R☉
Surface gravity (log g)1.2 - 1.9[4] cgs
Temperature5,517 - 6,482[4] K
Metallicity [Fe/H]−0.07 - 0.16[4] dex
Age116[7] Myr
Other designations
CD−57°4766, HD 112044, HIP 62986, HR 4895, SAO 240362[8]
Database references
SIMBADdata
Light curve of the classical Cepheid variable S Crucis recorded by NASA's Transiting Exoplanet Survey Satellite (TESS)

S Crucis is a star in the constellation Crux. A Cepheid variable, its apparent magnitude ranges from 6.22 to 6.92 over 4.68997 d.[2] It is a yellow-white supergiant that pulsates between spectral types F6Ib-II and G1Ib-II.[2]

S Crucis is a pulsating variable star of the δ Cephei type, a Classical Cepheid variable. Its mean radius is 37.9 R☉ and that radius varies by up to 4.1 R☉ during its 4.7-day pulsation cycle.[6] Over the same cycle, the effective temperature varies between 5,517 K and 6,482 K.[4] The star is thought to be 116 million years old; it has exhausted its core hydrogen and left the main sequence.[7]

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  2. ^ a b c d e Cite error: The named reference AAVSOS was invoked but never defined (see the help page).
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  4. ^ a b c d e Cite error: The named reference proxauf2018 was invoked but never defined (see the help page).
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  6. ^ a b Cite error: The named reference moskalik was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference marsakov2013 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).