RV Caeli
Template:Location mark Location of RV Caeli (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Caelum |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 6.4±0.01[2] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M1 III[4] |
| B−V Template:Engvar | +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 | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −1.36[9] |
| Details | |
| Mass | 1.14[10] Template:Solar mass |
| Radius | 107[11] Template:Solar radius |
| Luminosity | 976±30[12] Template:Solar luminosity |
| Surface gravity (log g) | 0.67[10] cgs |
| Temperature | 3,843±122[13] K |
| Metallicity [Fe/H] | −0.15[10] dex |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[14] | |
| Database references | |
| SIMBAD | data |
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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 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 Script error: No such module "val"..[7]
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,[16] and a 1982 survey also identified suspected variations. However, it could not confirm it was a variable star.[17] It was confirmed as a variable star in 1999 on the basis of the Hipparcos photometry and given the variable star designation RV Caeli.[18]
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 Script error: No such module "val"..[13] RV Caeli is metal deficient, having an iron abundance 70% that of the Sun.
References
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