Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 02m 26.24845s[2] |
Declination | −16° 57′ 53.3959″[2] |
Apparent magnitude (V) | 6.39[3] |
Characteristics | |
Spectral type | A2 V + K0 III[4] |
B−V color index | 0.447±0.022[3] |
Astrometry | |
Radial velocity (Rv) | +15.0±4.3[3] km/s |
Proper motion (μ) | RA: +5.292[2] mas/yr Dec.: +1.256[2] mas/yr |
Parallax (π) | 5.5489 ± 0.1285 mas[5] |
Distance | 590 ± 10 ly (180 ± 4 pc) |
Orbit[6] | |
Period (P) | 0.945 d |
Eccentricity (e) | 0.00 |
Periastron epoch (T) | 2,436,814.418±1.0 JD |
Semi-amplitude (K1) (primary) | 97.9 km/s |
Other designations | |
Database references | |
SIMBAD | data |
29 Aquarii is a binary star system located around 590 light years away from the Sun in the equatorial constellation of Aquarius. 29 Aquarii is the Flamsteed designation; the system also bears the variable star designation DX Aquarii. It is a challenge to view with the naked eye, appearing as a dim star with a combined apparent visual magnitude of 6.39.[3] The system is moving further from the Earth with a heliocentric radial velocity of about +15 km/s.[3]
This is a spectroscopic binary system with a close circular orbit taking just 0.945 days to complete.[6] Despite their proximity, this does not appear to be a contact binary system.[8] The orbital plane of the two stars lies near the line of sight, so they form an Algol-type eclipsing binary. The first component of the system is an A-type main sequence star with a stellar classification of A2 V. Its companion is giant star with a classification of K0 III.[4]
The variability of this system was first noticed in 1965 by W. Strohmeier of Remeis-Observatory in Bamberg, Germany.[9] He later discovered that the variability was caused by a binary companion eclipsing the primary star.[10]
Molik
was invoked but never defined (see the help page).GaiaDR2
was invoked but never defined (see the help page).Anderson2012
was invoked but never defined (see the help page).aj138_2_664
was invoked but never defined (see the help page).aaa474_2_653
was invoked but never defined (see the help page).Paffhausen1976
was invoked but never defined (see the help page).SIMBAD
was invoked but never defined (see the help page).Rucinski2002
was invoked but never defined (see the help page).Strohmeier1965
was invoked but never defined (see the help page).Strohmeier1966
was invoked but never defined (see the help page).