| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h46m 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 | |
f Sgr, 56 Sgr, BD−20°5698, GC 27349, HD 186648, HIP 97290, HR 7515, SAO 162964, GSC 06320-02845[10] | |
| Database references | |
| SIMBAD | data |
56 Sagittarii is a single[11] star in the southern constellationofSagittarius. 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]
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]
