Rho Sagittarii
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| 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 (ρ Sgr, ρ Sagittarii) 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.
[edit] ρ¹ Sagittarii
Rho-1 Sagittarii is a spectral type F0 subgiant which has an apparent magnitude of +3.93. It is 122 light years from Earth.
[edit] 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 | |
Rho-2 Sagittarii is a spectral type K0 giant which has an apparent magnitude of +5.84. It is 359 light years from Earth.
[edit] References
- "HD 181577 -- Variable Star". SIMBAD Astronomical Database. http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=rho1+sagittarii&NbIdent=1&Radius=10&Radius.unit=arcmin&CooFrame=FK5&CooEpoch=2000&CooEqui=2000&output.max=all&o.catall=on&output.mesdisp=N&Bibyear1=1983&Bibyear2=2005&Frame1=FK5&Frame2=FK4&Frame3=G&Equi1=2000.0&Equi2=1950.0&Equi3=2000.0&Epoch1=2000.0&Epoch2=1950.0&Epoch3=2000.0. Retrieved 2007-03-29.
- "HD 181645 -- Star". SIMBAD Astronomical Database. http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=rho2+sagittarii&NbIdent=1&Radius=10&Radius.unit=arcmin&CooFrame=FK5&CooEpoch=2000&CooEqui=2000&output.max=all&o.catall=on&output.mesdisp=N&Bibyear1=1983&Bibyear2=2005&Frame1=FK5&Frame2=FK4&Frame3=G&Equi1=2000.0&Equi2=1950.0&Equi3=2000.0&Epoch1=2000.0&Epoch2=1950.0&Epoch3=2000.0. Retrieved 2007-03-29.
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