Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 04m 47.42197s [1] |
Declination | −00° 54′ 22.8469″ [1] |
Apparent magnitude (V) | 5.29 [2] |
Characteristics | |
Spectral type | A5 IV [3] or Am (A5/A9V/F2) [4] |
B−V color index | 0.231±0.004 [2] |
Astrometry | |
Radial velocity (Rv) | 18.9±4.2 [2] km/s |
Proper motion (μ) |
RA: −19.69
[5]
mas/
yr Dec.: −42.15 [5] mas/ yr |
Parallax (π) | 14.4329 ± 0.1784 mas [1] |
Distance | 226 ± 3
ly (69.3 ± 0.9 pc) |
Absolute magnitude (MV) | 1.12 [2] |
Orbit [6] | |
Period (P) | 7.83238±0.00002 d |
Eccentricity (e) | 0 |
Periastron epoch (T) | 53,420.2304±0.0001 HJD |
Argument of periastron (ω) (secondary) | 0° |
Semi-amplitude (K1) (primary) | 7.2150±0.4 km/s |
Details | |
Mass | 1.69 [7] M☉ |
Radius | 2.97+0.17 −0.07 [1] R☉ |
Luminosity | 29.4±0.4 [1] L☉ |
Surface gravity (log g) | 4.11 [7] cgs |
Temperature | 7,976±271 [7] K |
Metallicity [Fe/H] | 0.26±0.12 [8] dex |
Rotational velocity (v sin i) | 9.6 [6] km/s |
Age | 465 [7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
32 Aquarii is a binary star system in the zodiac constellation of Aquarius. 32 Aquarii is its Flamsteed designation. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.29. [2] This system is moving away from the Earth with a heliocentric radial velocity of +19 km/s, [2] and is a possible member of the corona of the Ursa Major flow. [10]
This is a single-lined spectroscopic binary with an (assumed) circular orbit having a period of only 7.8 days. It has an a sin i value of 0.777 Gm (0.00519 AU), [6] where a is the semimajor axis and i is the orbital inclination. Since the sine function can be no larger than one, this provides a lower bound on the true semimajor axis of their orbit.
The primary component is a metallic-line (Am) star [6] with the calcium K line of an A3 star, the hydrogen lines of an F1 star, and the metal lines of an F2 star. [4] It is a sharp-lined, slowly rotating star [11] with a projected rotational velocity of 9.6 km/s [6] and is about 465 million years old. [7] The star has 1.69 [7] times the mass of the Sun and three [1] times the Sun's radius. It is radiating 29 [1] times the luminosity of the Sun from its photosphere at an effective temperature of 7,976 K. [7]