56 Sagittarii is a single[11] star in the southern constellation of Sagittarius. It has the Bayer designation f Sagittarii, while 56 Sagittarii is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.87.[2] It is located approximately 208 light years away from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +22 km/s.[6]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Sagittarius |
Right ascension | 19h 46m 21.73912s[1] |
Declination | −19° 45′ 40.0132″[1] |
Apparent magnitude (V) | 4.87[2] |
Characteristics | |
Evolutionary stage | horizontal branch[3] |
Spectral type | K0+III[4] |
U−B color index | +0.96[5] |
B−V color index | +1.06[5] |
Astrometry | |
Radial velocity (Rv) | +22.07[6] km/s |
Proper motion (μ) | RA: −129.40[1] mas/yr Dec.: −90.55[1] mas/yr |
Parallax (π) | 15.71 ± 0.23 mas[1] |
Distance | 208 ± 3 ly (63.7 ± 0.9 pc) |
Absolute magnitude (MV) | 0.85[2] |
Details | |
Mass | 1.77[7] M☉ |
Radius | 11[6] R☉ |
Luminosity | 58.97[2] L☉ |
Surface gravity (log g) | 2.58[8] cgs |
Temperature | 4,750[9] K |
Metallicity [Fe/H] | −0.07[8] dex |
Rotational velocity (v sin i) | 1.9[6] km/s |
Other designations | |
Database references | |
SIMBAD | data |
This is an aging giant star with a stellar classification of K0+III,[4] having exhausted the supply of hydrogen at its core and expanded to 11[6] times the Sun's radius. It is a red clump giant,[3] which means it is on the horizontal branch and is generating energy through helium fusion at its core. The star has 1.8[7] times the mass of the Sun and is radiating 59[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,750 K.[9]