HD 175740
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Lyra |
| Right ascension | 18h 54m 52.1771s / 18h 54m 51.5s |
| Declination | +41° 36' 9.801" / +41° 36' 13" |
| Apparent magnitude (V) | 5.465 / 12.6 |
| Characteristics | |
| Spectral type | G8III / ? |
| U-B color index | +1.03 / ? |
| B-V color index | +1.035 / ? |
| Astrometry | |
| Radial velocity (Rv) | -8.7 / ? km/s |
| Proper motion (μ) | RA: -1.37 / ? mas/yr Dec.: -2.30 / ? mas/yr |
| Parallax (π) | 12.19 ± 0.50 mas |
| Distance | 270 ± 10 ly (82 ± 3 pc) |
| Visual binary orbit | |
| Companion | BD+41°3177B |
| Semimajor axis (a) | 8.2" |
| Inclination (i) | 307° |
| Visual binary orbit | |
| Companion | BD+41° 3177C |
| Semimajor axis (a) | 23.6" |
| Inclination (i) | 40° |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 175740, BD+41°3177B and BD+41° 3177C are two components of a binary star system in the constellation Lyra, approximately 270 light years away from Earth. The main star, 5th magnitude HD 175740, is a yellow giant star of the spectral type G8III. It therefore has a surface temperature of 5,000 to 6,000 kelvins, in the same range as that of our Sun, though it is much larger and brighter in comparison.[1] BD+41°3177B is a 13th magnitude star of an unknown spectral type.[2]
[edit] References
- ^ a b Simbad Query Result. Simbad. Retrieved on October 15, 2007.
- ^ a b Simbad Query Result. Simbad. Retrieved on October 15, 2007.
[edit] Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Spectral type | Database references |
|---|---|---|---|---|---|
| BD+41°3177B | 18h 54m 51.5s | +41° 36' 13 | 12.6 | Simbad | |
| BD+41°3177C | 18h 54m 53.5s | +41° 36' 27 | 12.6 | Simbad |
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