94 Aquarii

94 Aquarii
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquarius
	94 Aquarii A (Aa/Ab)
Right ascension	23h 19m 06.7257s
Declination	–13° 27′ 31.6146″
Apparent magnitude (V)	5.19
	94 Aquarii B
Right ascension	23h 19m 06.5609s
Declination	–13° 27′ 18.9037″
Apparent magnitude (V)	7.52
Characteristics
94 Aqr A
Spectral type	G8.5 IV + K V
U−B color index	+0.42
B−V color index	+0.79
94 Aqr B
Spectral type	K2 V
U−B color index	+0.60
B−V color index	+0.88
Astrometry
94 Aquarii A (Aa/Ab)
Radial velocity (Rv)	+17.60±0.07 km/s
Proper motion (μ)	RA: 258.738±0.944 mas/yr ; Dec.: −73.014±0.928 mas/yr
Parallax (π)	44.8996 ± 0.5572 mas
Distance	72.6 ± 0.9 ly ; (22.3 ± 0.3 pc)
Absolute magnitude (MV)	+3.52/+6.52
94 Aquarii B
Proper motion (μ)	RA: 306.702±0.107 mas/yr ; Dec.: −104.633±0.086 mas/yr
Parallax (π)	44.5152 ± 0.0550 mas
Distance	73.27 ± 0.09 ly ; (22.46 ± 0.03 pc)
Absolute magnitude (MV)	+5.92
Orbit
Primary	94 Aquarii Aa
Companion	94 Aquarii Ab
Period (P)	6.321±0.010 yr
Semi-major axis (a)	0.189±0.002″
Eccentricity (e)	0.173±0.020
Inclination (i)	44.5±1.0°
Longitude of the node (Ω)	341.9±1.5°
Periastron epoch (T)	2012.301
Argument of periastron (ω); (secondary)	28.3°
Details
94 Aquarii Aa
Mass	1.22±0.03 M☉
Radius	2.06±0.03 R☉
Luminosity	3.30±0.06 L☉
Surface gravity (log g)	3.88 cgs
Temperature	5,461 K
Metallicity [Fe/H]	+0.23 dex
Rotational velocity (v sin i)	8 km/s
Age	6.2±0.2 Gyr
94 Aquarii Ab
Mass	0.81±0.04 M☉
Radius	0.85±0.03 R☉
Temperature	4,670 or 4,970 K
94 Aquarii B
Surface gravity (log g)	4.54 cgs
Temperature	5,136 K
Metallicity [Fe/H]	+0.24 dex
Other designations
	BD−14 6448, GJ 894.2, HD 219834, HIP 115126, HR 8866, SAO 165625
Database references
SIMBAD	data

94 Aquarii (abbreviated 94 Aqr) is a triple star^[12] 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. The parallax measured by the Gaia spacecraft yields a distance estimate of around 73 light-years (22 parsecs) from Earth.^[1]

The inner pair of this triple star system form a spectroscopic binary with an orbital period of 6.321 years, a moderate orbital eccentricity of 0.173,^[7] and a combined visual magnitude of 5.19.^[13] The primary component of this pair has a stellar classification of G8.5 IV,^[9] 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^[13] K-type main sequence star with a classification of K2 V.^[4]

References

^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c ^d ^e ^f ^g 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.
^ ^a ^b ^c ^d ^e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c 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:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ ^a ^b ^c ^d ^e Fuhrmann, Klaus (February 2008). "Nearby stars of the Galactic disc and halo - IV". Monthly Notices of the Royal Astronomical Society. 384 (1): 173–224. Bibcode:2008MNRAS.384..173F. doi:10.1111/j.1365-2966.2007.12671.x.
^ Katoh, Noriyuki; et al. (2013). "Determination of Orbital Elements of Spectroscopic Binaries Using High-dispersion Spectroscopy". The Astronomical Journal. 145 (2). 41. Bibcode:2013AJ....145...41K. doi:10.1088/0004-6256/145/2/41.
^ ^a ^b ^c ^d Docobo, José A.; et al. (2018). "Visual Orbit and Individual Masses of the Single-lined Spectroscopic Binary 94 AQR A (HD 219834A; MCA 74)". The Astronomical Journal. 156 (3). 85. Bibcode:2018AJ....156...85D. doi:10.3847/1538-3881/aad179.
^ ^a ^b ^c ^d ^e ^f Metcalfe, Travis S.; van Saders, Jennifer L.; Basu, Sarbani; Buzasi, Derek; Chaplin, William J.; Egeland, Ricky; Garcia, Rafael A.; Gaulme, Patrick; Huber, Daniel; Reinhold, Timo; Schunker, Hannah; Stassun, Keivan G.; Appourchaux, Thierry; Ball, Warrick H.; Bedding, Timothy R.; Deheuvels, Sébastien; González-Cuesta, Lucía; Handberg, Rasmus; Jiménez, Antonio; Kjeldsen, Hans; Li, Tanda; Lund, Mikkel N.; Mathur, Savita; Mosser, Benoit; Nielsen, Martin B.; Noll, Anthony; Çelik Orhan, Zeynep; Örtel, Sibel; Santos, Ângela R. G.; Yildiz, Mutlu; Baliunas, Sallie; Soon, Willie (11 September 2020). "The Evolution of Rotation and Magnetic Activity in 94 Aqr Aa from Asteroseismology with TESS". The Astrophysical Journal. 900 (2): 154. arXiv:2007.12755. Bibcode:2020ApJ...900..154M. doi:10.3847/1538-4357/aba963.
^ ^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, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B.
^ "* 94 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-17.
^ 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.
^ ^a ^b van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.

External links

Image 94 Aquarii

[Gaia_DR2_for_A-1] ^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[aass34_1-2] ^ ^a ^b ^c ^d ^e ^f ^g 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.

[Gaia_DR2_for_B-3] Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[mnras389_2_869-4] 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:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.

[Fuhrmann-5] Fuhrmann, Klaus (February 2008). "Nearby stars of the Galactic disc and halo - IV". Monthly Notices of the Royal Astronomical Society. 384 (1): 173–224. Bibcode:2008MNRAS.384..173F. doi:10.1111/j.1365-2966.2007.12671.x.

[Katoh2013-6] Katoh, Noriyuki; et al. (2013). "Determination of Orbital Elements of Spectroscopic Binaries Using High-dispersion Spectroscopy". The Astronomical Journal. 145 (2). 41. Bibcode:2013AJ....145...41K. doi:10.1088/0004-6256/145/2/41.

[Docobo2018-7] Docobo, José A.; et al. (2018). "Visual Orbit and Individual Masses of the Single-lined Spectroscopic Binary 94 AQR A (HD 219834A; MCA 74)". The Astronomical Journal. 156 (3). 85. Bibcode:2018AJ....156...85D. doi:10.3847/1538-3881/aad179.

[Metcalfe2020-8] ^ ^a ^b ^c ^d ^e ^f Metcalfe, Travis S.; van Saders, Jennifer L.; Basu, Sarbani; Buzasi, Derek; Chaplin, William J.; Egeland, Ricky; Garcia, Rafael A.; Gaulme, Patrick; Huber, Daniel; Reinhold, Timo; Schunker, Hannah; Stassun, Keivan G.; Appourchaux, Thierry; Ball, Warrick H.; Bedding, Timothy R.; Deheuvels, Sébastien; González-Cuesta, Lucía; Handberg, Rasmus; Jiménez, Antonio; Kjeldsen, Hans; Li, Tanda; Lund, Mikkel N.; Mathur, Savita; Mosser, Benoit; Nielsen, Martin B.; Noll, Anthony; Çelik Orhan, Zeynep; Örtel, Sibel; Santos, Ângela R. G.; Yildiz, Mutlu; Baliunas, Sallie; Soon, Willie (11 September 2020). "The Evolution of Rotation and Magnetic Activity in 94 Aqr Aa from Asteroseismology with TESS". The Astrophysical Journal. 900 (2): 154. arXiv:2007.12755. Bibcode:2020ApJ...900..154M. doi:10.3847/1538-4357/aba963.

[aj132_1_161-9] 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/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.

[coapa239_1-10] Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B.

[SIMBAD-11] "* 94 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-17.

[apj135_301-12] 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.

[aaa474_2_653-13] van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.

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94 Aquarii

References

External links

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