HD 172044
| Observation data Epoch J2000.0 Equinox J2000.0 | ||
|---|---|---|
| Constellation | Lyra
| |
| Right ascension | 18h 36m 37.34437s[1] | |
| Declination | 33° 28′ 08.5352″[1] | |
| Apparent magnitude (V) | 5.41[2] + 10.7[3] | |
| Characteristics | ||
| Spectral type | B8IIpHgMn[4] | |
| U−B color index | −0.509[2] | |
| B−V color index | −0.101±0.003[2] | |
Semi-amplitude (K1)(primary) | 3.2 km/s | |
| Details | ||
| A | ||
Rotational velocity (v sin i) | 34[9] km/s | |
| Database references | ||
| SIMBAD | data | |
HD 172044 is a
light years based on parallax.[1] It is drifting closer with a radial velocity of −32.5 km/s, and is predicted to come as near as 77.3 light-years to the Sun some 4.5 million years from now.[2]
The dual nature of the primary star, component A, was announced in 1973 by
bright giant with a stellar classification of B8IIpHgMn,[4] where the suffix notation indicates it is a chemically peculiar mercury-manganese star.[9]
Component B is a magnitude 9.40 companion of an unknown spectral type.arcseconds along a position angle of 204° from the brighter component.[3]
References
- ^ .
- ^ S2CID 119257644.
- ^ doi:10.1086/323920.
- ^ doi:10.1086/146706.
- S2CID 119231169.
- ^ .
- ^ doi:10.1086/190265.
- S2CID 111387483.
- ^ S2CID 119062018.
- ^ "HD 172044". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-25.
- S2CID 14878976.
- ^ "HD 172044B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-25.
External links
- alcyone software - star data pages Archived 2007-06-21 at the Wayback Machine