HD 172044
HD 172044 and BD+33°3154B are two components of a binary star system in the constellation Lyra, approximately 520 light years away from Earth. 5th magnitude HD 172044 is a giant or subgiant star with the spectral type B8II-IIIp... The "p..." signifies that the star has a peculiar spectrum and spectral peculiarities have yet to be described. It is bluish white in color and has a surface temperature of 11,000 to 25,000 kelvins. It is therefore at least twice as hot as our Sun on its surface, and many times brighter and larger in size.[1] BD+33°3154B is an 11th magnitude star of an unknown spectral type.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 36m 37.3435s / 18h 36m 36.9s |
| Declination | +33° 28' 8.531" / +33° 28' 2" |
| Apparent magnitude (V) | 5.410 / 10.7 |
| Characteristics | |
| Spectral type | B8II-IIIp... / ? |
| U−B color index | -0.51 / ? |
| B−V color index | -0.09 / ? |
| Astrometry | |
| Radial velocity (Rv) | -26.3 / -27.4 km/s |
| Proper motion (μ) | RA: -9.01 / ? mas/yr Dec.: -0.39 / ? mas/yr |
| Parallax (π) | 6.25 ± 0.53 mas |
| Distance | 520 ± 40 ly (160 ± 10 pc) |
| Orbit | |
| Companion | BD+33°3154B |
| Semi-major axis (a) | 7.3″ |
| Inclination (i) | 205° |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
- "Simbad Query Result". Simbad. Retrieved October 16, 2007.
- "Simbad Query Result". Simbad. Retrieved October 16, 2007.
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