Upsilon Capricorni
Template:Location mark Location of υ Capricorni (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Capricornus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.17[2] |
| Characteristics | |
| Spectral type | M1 III[3] |
| B−V Template:Engvar | +1.65[2] |
| Astrometry | |
| Radial velocity (Rv) | Template:Val[4] km/s |
| Proper motion (μ) | RA: Template:Val mas/yr[5] Dec.: Template:Val mas/yr[5] |
| Parallax (π) | 5.1719±0.1354 mas[5] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −1.09[6] |
| Details | |
| Radius | Template:Val[7] Template:Solar radius |
| Luminosity | Template:Val[1] Template:Solar luminosity |
| Temperature | Template:Val[1] K |
| Metallicity [Fe/H] | −0.08[6] dex |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
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Upsilon Capricorni, Latinized from υ Capricorni, is a solitary[9] star in the southern constellation of Capricornus. It has a reddish hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.17.[2] The star is about 630 light years away based on parallax,[5] but is drifting closer with a radial velocity of −12 km/s.[4] It is 0.22 degree north of the ecliptic, so is subject to lunar occultations.[10][11]
This is an aging red giant star on the asymptotic giant branch[12] with a stellar classification of M1 III,[3] a star that has exhausted the supply of hydrogen at its core then cooled and expanded. It has 92 times the radius of the Sun[7] and is radiating 1,283 times the luminosity of the Sun[1] from its swollen photosphere at an effective temperature of 3,953 K.[1]
It is a suspected variable star of unknown type with a brightness that has been measured ranging from a peak of 5.19 down to 5.24.[13]
References
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