HD 177765
From Wikipedia, the free encyclopedia
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h 07m 09.77940s[1] |
| Declination | −26° 19′ 54.5064″[1] |
| Apparent magnitude (V) | 9.15[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1] |
| Spectral type | A5 SrEuCr[3] |
| B−V color index | 0.45[2] |
| J−H color index | 0.071[4] |
| J−K color index | 0.055[4] |
| Variable type | roAp[5] |
| Astrometry | |
| Proper motion (μ) | RA: −2.063[1] mas/yr Dec.: −4.425[1] mas/yr |
| Parallax (π) | 2.5411±0.0186 mas[1] |
| Distance | 1,284 ± 9 ly (394 ± 3 pc) |
| Absolute magnitude (MV) | 1.55,[6] 1.166[7] |
| Details[6] | |
| Mass | 1.81, 2.2[8] M☉ |
| Radius | 2.57 R☉ |
| Luminosity | 18.9, 26.9,[7] ~32[8] L☉ |
| Surface gravity (log g) | 3.79 cgs |
| Temperature | 7420, 7002,[7] 8000[8] K |
| Rotational velocity (v sin i) | 2.50[9] km/s |
| Age | 955 Myr |
| Other designations | |
| CD−26°13816, CPD−26°6650, HD 177765, SAO 187692, PPM 269324, EPIC 214503319, TIC 465996299, TYC 6882-1808-1, GSC 06882-01808, 2MASS J19070978-2619543, Gaia DR2 6763969142066777344, Renson 49550[4] | |
| Database references | |
| SIMBAD | data |
HD 177765 is a white-hued star in the southern constellation of Sagittarius. With an apparent magnitude of 9.15, it is too faint to be seen by the naked eye from Earth, but is dimly visible using binoculars.[10] It is located at a distance of 1,284 light-years (394 parsecs) according to Gaia DR3 parallax measurements.
