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94 Aquarii

<tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Astrometry</th></tr></th></tr><tr><th colspan="2" style="text-align: center"></tr><tr style="vertical-align:top;"><td>Radial velocity (Rv)</td><td>+10.8[4] km/s</td></tr><tr style="vertical-align:top;"><td>Proper motion (μ)</td><td> RA: +267.23[1] mas/yr
Dec.: –46.21[1] mas/yr </td></tr><tr style="vertical-align:top;"><td>Parallax (π)</td><td>47.35 ± 2.47[1]mas</td></tr><tr style="vertical-align:top;"><td>Distance</td><td>69 ± 4 ly
(21 ± 1 pc)</td></tr><tr><th colspan="2" style="text-align: center"></th></tr> <tr><td style="background-color: #FFFFC0;" colspan="2" align=center>Orbit[4]</td></tr><tr style="vertical-align:baseline;"><td>Primary</td><td>94 Aqr A</td></tr><tr style="vertical-align:baseline;"><td>Companion</td><td>94 Aqr Aa</td></tr><tr style="vertical-align:baseline;"><td>Period (P)</td><td>2323.6 ± 10.7 days</td></tr><tr style="vertical-align:baseline;"><td>Eccentricity (e)</td><td>0.082 ± 0.06</td></tr><tr style="vertical-align:baseline;"><td>Periastron epoch (T)</td><td>JD 2429308.4 ± 22</td></tr><tr style="vertical-align:baseline;"><td>Argument of periastron (ω)
(secondary)</td><td>225.7 ± 44.5°</td></tr><tr style="vertical-align:baseline;"><td>Semi-amplitude(K1)
(primary)</td><td>+5.9 ± 0.37 km/s</tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Details</th></tr></th></tr><tr><th colspan="2" style="text-align: center">94 Aqr A</th></tr><tr style="vertical-align:baseline;"><td>Surface gravity (log g)</td><td>3.88[5] cgs</td></tr><tr style="vertical-align:baseline;"><td>Temperature</td><td>5,461[5] K</td></tr><tr style="vertical-align:baseline;"><td>Metallicity [Fe/H]</td><td>+0.23[5] dex</td></tr><tr style="vertical-align:baseline;"><td>Rotational velocity (v sin i)</td><td>8[6] km/s</td></tr><tr><th colspan="2" style="text-align: center"></th></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Other designations</th></tr><tr><td colspan="2">
BD–14 6448, GJ 894.2, HD 219834, HIP 115126, HR 8866, SAO 165625.[7]
94 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 19m 06.66907s[1]
Declination –13° 27′ 30.8023″[1]
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94 Aquarii is the Flamsteed designation for a triple star[4] system in the equatorial constellation of Aquarius. 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 Script error: No such module "convert". 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


  1. ^ a b c d e f g h van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d 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. ^ a b 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, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878, doi:10.1111/j.1365-2966.2008.13596.x. 
  4. ^ a b c d 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. ^ a b c d 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, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770, 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