| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Indus |
| Right ascension | 21h 39m 59.719s[1] |
| Declination | −52° 21′ 32.43″[1] |
| Apparent magnitude (V) | 6.21[2] |
| Characteristics | |
| Spectral type | F7III[3] |
| U−Bcolor index | 0.32[2] |
| B−Vcolor index | 0.596[2] |
| Astrometry | |
| Proper motion (μ) | RA: −17.62±0.59[1]mas/yr Dec.: 7.04±0.37[1]mas/yr |
| Parallax (π) | 5.75±0.55 mas[1] |
| Distance | 570 ± 50 ly (170 ± 20 pc) |
| Orbit[4] | |
| Primary | HD 205877 A |
| Companion | HD 205877 B |
| Period (P) | 21.31±0.74yr |
| Semi-major axis (a) | 0.0762±0.0084″ |
| Eccentricity (e) | 0.54±0.18 |
| Inclination (i) | 150.4±11.1° |
| Longitude of the node (Ω) | 31.5±74.2° |
| Periastronepoch (T) | 1998.80±1.45 |
| Argument of periastron (ω) (secondary) | 231.4±66.6° |
| Details | |
| A | |
| Mass | 2.34[4] M☉ |
| B | |
| Mass | 2.20[4] M☉ |
| Other designations | |
| HDS 3084,HIP 106978,HR 8269,WDS J21400-5222AB[5] | |
| Database references | |
| SIMBAD | data |
HD 205877 is a visual binary star system in theconstellationIndus. It also a double linedspectroscopic binary.[3] The components are very similar and both are located on thegiant branch in theHertzsprung–Russell diagram in agreement with the F7III spectral type.[4]
The visual binary nature of HD 205877 was discovered by theHipparcos spacecraft and given thedouble star discoverer designation HDS 3084. The preliminary orbital elements of the system were determined withspeckle interferometric measurements made at the 4.1 mSouthern Astrophysical Research Telescope inChile.[4]
 | This giant-star-related article is astub. You can help Wikipedia byexpanding it. |
