32 Aquarii

32 Aquarii
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]
Distance226 ± 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
Mass1.69[7] M☉
Radius2.97+0.17
−0.07[1] R☉
Luminosity29.4±0.4[1] L☉
Surface gravity (log g)4.11[7] cgs
Temperature7,976±271[7] K
Metallicity [Fe/H]0.26±0.12[8] dex
Rotational velocity (v sin i)9.6[6] km/s
Age465[7] Myr
Other designations
32 Aqr, BD−01°4242, HD 209625, HIP 108991, HR 8410, SAO 145853[9]
Database references
SIMBADdata

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]

  1. ^ a b c d e f g Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Abt2009 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference Carrier2007 was invoked but never defined (see the help page).
  7. ^ a b c d e f g Cite error: The named reference David2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference HuiBonHoa2000 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Chupina2006 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Kocer1987 was invoked but never defined (see the help page).