S Muscae

Star in the constellation Musca From Wikipedia, the free encyclopedia

S Muscae

S Muscae is a classical (δ) Cepheid variable star in the constellation Musca about 2,600 light years away.

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A light curve for S Muscae, plotted from TESS data[11]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
S Muscae
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Location of S Muscae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Musca
Right ascension 12h 12m 47.01834s[1]
Declination 70° 09 06.4363[1]
Apparent magnitude (V) 6.394[2] (5.89 - 6.49[3])
Characteristics
Spectral type F6Ib (F6-G0[3]) + B5V[4]
U−B color index +0.66[5]
B−V color index +1.00[5]
Variable type δ Cepheid[3]
Astrometry
Radial velocity (Rv)1.91[6] km/s
Proper motion (μ) RA: 7.79[1] mas/yr
Dec.: 0.60[1] mas/yr
Parallax (π)1.99±0.84 mas[1]
Distance863[2] pc
Absolute magnitude (MV)4.01[7]
Orbit[7][8]
Period (P)504.9 ± 0.07
Semi-major axis (a)794 AU
Eccentricity (e)0.08 ± 0.002
Inclination (i)32 ± 1°
Semi-amplitude (K1)
(primary)
14.7 ± 0.2 km/s
Details
Mass6.2[7] M
Radius65.1[2] R
Luminosity3,467[7] L
Metallicity+0.18[9]
companion
Mass5.3[7] M
Temperature17,000[10] K
Other designations
S Mus, HR 4645, SAO 251791, CD69°977, GSC 09231-00752, HD 106111, GC 16679, HIP 59551, AAVSO 1207-69
Database references
SIMBADdata
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S Muscae is a yellow supergiant ranging between spectral types F6Ib and G0Ib and magnitudes 5.89 to 6.49 over a period of 9.66 days.[3] It is a luminous star around six times as massive as the Sun and 65.1 times the radius of the Sun. It is a binary star with a blue-white main sequence star companion likely to be of spectral type B3V to B5V with a mass of just over five solar masses,[12] one of the hottest and brightest companions of a Cepheid known. The two stars orbit each other every 505 days.[13]

S Muscae has been found to lie within the faint star cluster ASCC 69.[14]

References

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