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Star in the constellation Caelum From Wikipedia, the free encyclopedia
RV Caeli, also known as HD 28552, is a solitary, red hued variable star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 6.4,[2] placing it near the limit for naked eye visibility. The object is located relatively far at a distance of 1,340 light years based on parallax measurements from Gaia DR3,[1] but is rapidly receding with a heliocentric radial velocity of 98 km/s.[7]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Caelum |
Right ascension | 04h 28m 09.46368s[1] |
Declination | −41° 51′ 35.4013″[1] |
Apparent magnitude (V) | 6.4±0.01[2] |
Characteristics | |
Evolutionary stage | AGB[3] |
Spectral type | M1 III[4] |
B−V color index | +1.64[5] |
Variable type | semiregular[6] |
Astrometry | |
Radial velocity (Rv) | 97.9±0.5[7] km/s |
Proper motion (μ) | RA: −14.75 mas/yr[8] Dec.: +2.87 mas/yr[8] |
Parallax (π) | 2.4402 ± 0.0229 mas[1] |
Distance | 1,340 ± 10 ly (410 ± 4 pc) |
Absolute magnitude (MV) | −1.36[9] |
Details | |
Mass | 1.14[10] M☉ |
Radius | 107[11] R☉ |
Luminosity | 976±30[12] L☉ |
Surface gravity (log g) | 0.67[10] cgs |
Temperature | 3,843±122[13] K |
Metallicity [Fe/H] | −0.15[10] dex |
Other designations | |
Database references | |
SIMBAD | data |
Hipparcos has found it to vary between its photometric values of 6.44 and 6.56,[6] which roughly corresponds with the magnitude as seen with the naked eye. It was first suspected of variability in 1970,[17] and a 1982 survey also identified suspected variations. However, it could not confirm it was a variable star.[18] It was confirmed as a variable star in 1999 on the basis of the Hipparcos photometry and given the variable star designation RV Caeli.[19]
RV Caeli is an evolved red giant star with a stellar classification of M1 III.[4] It is currently on the asymptotic giant branch,[3] generating energy via hydrogen and helium shell fusion around an inert carbon core. It has 114% the mass of the Sun[10] but has expanded to over 100 times its girth.[11] It radiates 976 times the luminosity of the Sun[12] from its photosphere at an effective temperature of 3,843 K.[13] RV Caeli is metal deficient, having an iron abundance 70% that of the Sun.
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