94 Aquarii

94 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 19m 06.66907s[1]
Declination –13° 27′ 30.8023″[1]
Apparent magnitude (V) 5.19/7.52[2]
Characteristics
Spectral type G8.5 IV + K2 V + ?[3]
U−B color index +0.42/+0.60[2]
B−V color index +0.79/+0.88[2]
Astrometry
Radial velocity (Rv)+10.8[4] km/s
Proper motion (μ) RA: +267.23[1] mas/yr
Dec.: –46.21[1] mas/yr
Parallax (π)47.35 ± 2.47[1] mas
Distance69 ± 4 ly
(21 ± 1 pc)
Orbit[4]
Primary94 Aqr A
Companion94 Aqr Aa
Period (P)2323.6 ± 10.7 days
Eccentricity (e)0.082 ± 0.06
Periastron epoch (T)JD 2429308.4 ± 22
Argument of periastron (ω)
(secondary)		225.7 ± 44.5°
Semi-amplitude (K1)
(primary)		+5.9 ± 0.37 km/s
Details
94 Aqr A
Surface gravity (log g)3.88[5] cgs
Temperature5,461[5] K
Metallicity [Fe/H]+0.23[5] dex
Rotational velocity (v sin i)8[6] km/s
Other designations
BD–14 6448, GJ 894.2, HD 219834, HIP 115126, HR 8866, SAO 165625.[7]

94 Aquarii (abbreviated 94 Aqr) is a triple star[4] system in the equatorial constellation of Aquarius. 94 Aquarii is the Flamsteed designation. The brightest member has an apparent visual magnitude of 5.19,[2] making it visible to the naked eye. An annual parallax shift of 47.35 milliarcseconds yields a distance estimate of around 69 light-years (21 parsecs) from Earth.[1]

The inner pair of this triple star system form a spectroscopic binary with an orbital period of 2323.6 days (6.36 years), a low orbital eccentricity of 0.08,[4] and a combined visual magnitude of 5.19.[1] The primary component of this pair has a stellar classification of G8.5 IV,[5] with the luminosity class of IV indicating this is a subgiant star. At an angular separation of 13.0 arcseconds from this pair is a magnitude 7.52[1] K-type main sequence star with a classification of K2 V.[3]

See also

References

  1. 1 2 3 4 5 6 7 8 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 1 2 3 4 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
  3. 1 2 Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  4. 1 2 3 4 Sarma, M. B. K. (January 1962), "The Orbit of the Spectroscopic Binary 94 Aquarii", Astrophysical Journal, 135: 301, Bibcode:1962ApJ...135..301S, doi:10.1086/147268.
  5. 1 2 3 4 Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770Freely accessible, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
  6. ↑ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1), Bibcode:1970CoAsi.239....1B.
  7. ↑ "94 Aqr -- Double or multiple star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-17

External links

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