Psi3 Aquarii
Binary star in the constellation Aquarius
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Psi3 Aquarii is a visual binary star[10] system in the constellation of Aquarius. Its name is a Bayer designation that is Latinized from ψ3 Aquarii, and abbreviated Psi3 Aqr or ψ3 Aqr. The pair has an apparent visual magnitude of 4.98,[3] which is bright enough to be seen with the naked eye. Parallax measurements give a distance estimate of roughly 262 light-years (80 parsecs),[11] but it is drifting closer with a radial velocity of −10 km/s.[6]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Aquarius[1] |
| Right ascension | 23h 18m 57.677s[2] |
| Declination | −09° 36′ 38.70″[2] |
| Apparent magnitude (V) | 4.98[3] |
| Characteristics | |
| Evolutionary stage | Main sequence[4] |
| Spectral type | A0 V[5] |
| U−B color index | −0.02 |
| B−V color index | −0.02[3] |
| Astrometry | |
| Radial velocity (Rv) | −10[6] km/s |
| Proper motion (μ) | RA: +44.346 mas/yr[2] Dec.: −7.951 mas/yr[2] |
| Parallax (π) | 14.1132±0.1253 mas[2] |
| Distance | 231 ± 2 ly (70.9 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.47[1] |
| Details | |
| A | |
| Mass | 2.67±0.04[4] M☉ |
| Radius | 2[7] R☉ |
| Luminosity | 72.9+6.0 −5.5[4] L☉ |
| Surface gravity (log g) | 4.2±0.14[8] cgs |
| Temperature | 9,931+69 −68[4] K |
| Rotational velocity (v sin i) | 144[4] km/s |
| Age | 284+38 −79[8] Myr |
| B | |
| Mass | 0.8±0.02[8] M☉ |
| Temperature | 4,943±91[8] K |
| Metallicity [Fe/H] | 0.5[8] dex |
| Other designations | |
| Psi3 Aqr, ψ3 Aqr, 95 Aquarii, BD−10 6094, FK5 1609, GC 32459, HD 219832, HIP 115115, HR 8865, SAO 146635, PPM 207410, ADS 16671, WDS J23190-0937A[9] | |
| Database references | |
| SIMBAD | data |
The main component of this system is an A-type main sequence star with a stellar classification of A0 V.[5] It has 2.7[4] times the mass and double the radius of the Sun. The star is radiating 73[4] times as much luminosity as the Sun from its photosphere at an effective temperature of 9,931 K. It is around 284[8] million years old and has a high rate of spin with a projected rotational velocity of 144 km/s.[4]
Its companion is an 9th magnitude star at an angular separation of 1.5 arcseconds from the primary.[12] This system is an X-ray source with a luminosity of 8.34×1029 erg·s−1. This radiation most likely comes from the companion star.[10]