HD 182681 (186 G. Sagittarii) is a single,[11] blue-hued star in the zodiac constellation of Sagittarius. It has an apparent visual magnitude of +5.64, which is bright enough to be visible to the naked eye in good conditions. Based upon an annual parallax shift of 14.0013 mas as seen from Earth, this star is located around 233 light years from the Sun. It is moving away from the Sun with a radial velocity of 1.40 km/s.[4]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h 26m 56.4828s[1] |
| Declination | −29° 44′ 35.612″[1] |
| Apparent magnitude (V) | +5.64[2] |
| Characteristics | |
| Spectral type | B8.5V[3] |
| Astrometry | |
| Radial velocity (Rv) | 1.40[4] km/s |
| Proper motion (μ) | RA: +18.349[1] mas/yr Dec.: -50.126[1] mas/yr |
| Parallax (π) | 14.0013 ± 0.1325 mas[1] |
| Distance | 233 ± 2 ly (71.4 ± 0.7 pc) |
| Absolute magnitude (MV) | +1.44[5] |
| Details | |
| Mass | 2.33[6] M☉ |
| Radius | 2.8[7] R☉ |
| Luminosity | 31[6] L☉ |
| Surface gravity (log g) | 4.3[8] cgs |
| Temperature | 10,046[6] K |
| Rotational velocity (v sin i) | 277[6] km/s |
| Age | 107[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a B-type main sequence star with a stellar classification of B8.5V. The star is about 107[8] million years old and is spinning rapidly with a projected rotational velocity of 277 km/s.[6] It has an infrared excess, which suggests a debris disk is orbiting the star at a radius of 47 AU with a mean temperature of 90 K.[12]