43 Sagittarii is a single[10] star in the southern constellation of Sagittarius. It has the Bayer designation d Sagittarii, while 43 Sagittarii is the Flamsteed designation.[9] This object is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.88.[2] From parallax measurements, it is estimated to lie around 470 light years away from the Sun.[1] The star is drifting further from the Earth with a heliocentric radial velocity of +15.2 km/s.[5] It is located near the ecliptic and thus is subject to lunar occultations.[11]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h 17m 38.07906s[1] |
| Declination | −18° 57′ 10.4626″[1] |
| Apparent magnitude (V) | 4.88[2] |
| Characteristics | |
| Spectral type | G8II-III[3] |
| U−B color index | +0.81[4] |
| B−V color index | +1.02[4] |
| Astrometry | |
| Radial velocity (Rv) | +15.20[5] km/s |
| Proper motion (μ) | RA: −10.341[1] mas/yr Dec.: −10.892[1] mas/yr |
| Parallax (π) | 6.9681 ± 0.1875 mas[1] |
| Distance | 470 ± 10 ly (144 ± 4 pc) |
| Absolute magnitude (MV) | -0.96[2] |
| Details[6] | |
| Mass | 3.30 M☉ |
| Radius | 23.99 R☉ |
| Luminosity | 277 L☉ |
| Surface gravity (log g) | 2.22 cgs |
| Temperature | 4,813 K |
| Metallicity [Fe/H] | −0.18 dex |
| Rotational velocity (v sin i) | 4.2[7] km/s |
| Age | 350±100[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an aging giant/bright giant star with a stellar classification of G8II-III,[3] and is most likely (97% chance) on the horizontal branch.[8] It is around 350[8] million years old with 3.3[6] times the mass of the Sun. Having exhausted the supply of hydrogen at its core, the star has expanded to 24[6] times the Sun's radius and is now generating energy through core helium fusion. It is radiating 277 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,813 K.[6]