97 Aquarii

97 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 22m 39.17113s[1]
Declination –15° 02′ 21.6245″[1]
Apparent magnitude (V) 5.20[2] (5.59/6.72)[3]
Characteristics
Spectral type A2 V + A7 V[4]
U−B color index +0.10[2]
B−V color index +0.20[2]
Astrometry
Radial velocity (Rv)–12[5] km/s
Proper motion (μ) RA: +117.00[1] mas/yr
Dec.: +16.48[1] mas/yr
Parallax (π)15.30 ± 0.79 mas[1]
Distance210 ± 10 ly
(65 ± 3 pc)
Orbit[6]
Period (P)64.62 yr
Semi-major axis (a)0.408″
Eccentricity (e)0.140
Inclination (i)77.6°
Longitude of the node (Ω)276.3°
Periastron epoch (T)1941.29
Argument of periastron (ω)
(secondary)		354.6°
Details
Rotational velocity (v sin i)175[7] km/s
Other designations
BD–15° 6406, HD 220278, HIP 115404, HR 8890, SAO 165658.[8]
Database references
SIMBADdata

97 Aquarii (abbreviated 97 Aqr) is a binary star system in the equatorial constellation of Aquarius. 97 Aquarii is the Flamsteed designation. The combined apparent visual magnitude of the system is 5.20;[2] the brighter star is magnitude 5.59 while the companion is magnitude 6.72.[3] Based upon an annual parallax shift of 15.30 milliarcseconds,[1] this system is at a distance of around 210 light-years (64 parsecs) from Earth.

The two stars in this system orbit each other over a period of 64.62 years at an eccentricity of 0.14.[3] Both are A-type main sequence stars; the primary has a stellar classification of A2 V while its companion is A7 V.[4] Their composite spectrum shows the properties of a Lambda Boötis star, which means it displays peculiar abundances of certain elements.[9]

  1. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference aass34_1 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference mnras389_2_869 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference pasp81_482_643 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference gcsrv was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference orbits was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference aaa463_2_671 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aaa412_447 was invoked but never defined (see the help page).