Rho Sagittarii
|
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h 21m 40.4s |
| Declination | −17° 50' 50" |
| Apparent magnitude (V) | +3.92 |
| Distance | 122 ± 3 ly (37 ± 1 pc) |
| Spectral type | F0III/IV |
| Other designations | |
The Bayer designation Rho Sagittarii (Rho Sgr, ρ Sagittarii, ρ Sgr) is shared by two stars, ρ¹ Sagittarii and ρ² Sagittarii, in the constellation Sagittarius. The two stars are separated by 0.46° in the sky. Because they are close to the ecliptic, they can be occulted by the Moon and, very rarely, by planets. The next occultation of ρ¹ Sagittarii by a planet will take place on 23 February 2046, when it will be occulted by Venus.
ρ¹ Sagittarii
Rho¹ Sagittarii (Rho¹ Sgr, ρ¹ Sagittarii, ρ¹ Sgr) is a spectral type F0 subgiant which has an apparent magnitude of +3.93. It is 122 light years from Earth.
ρ² Sagittarii
|
|
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h 21m 50.9s |
| Declination | −18° 18' 30" |
| Apparent magnitude (V) | +5.84 |
| Distance | 359 ± 32 ly (110 ± 10 pc) |
| Spectral type | K0III |
| Other designations | |
Rho² Sagittarii (Rho² Sgr, ρ² Sagittarii, ρ² Sgr) is a spectral type K0 giant which has an apparent magnitude of +5.84. It is 359 light years from Earth.
Naming
In Chinese, 建 (Jiàn), meaning Establishment, refers to an asterism consisting of ρ¹ Sagittarii ξ² Sagittarii, ο Sagittarii, π Sagittarii, 43 Sagittarii and υ Sagittarii. Consequently, ρ¹ Sagittarii itself is known as 建五 (Jiàn wǔ, English: the Fifth Star of Establishment.)[1]
References
- "HD 181577 -- Variable Star". SIMBAD Astronomical Database. Retrieved 2007-03-29.
- "HD 181645 -- Star". SIMBAD Astronomical Database. Retrieved 2007-03-29.
| ||||||||||||||||||||||||||||||||||