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{{other stars by Bayer designation|Psi Aquarii{{!}}ψ Aquarii}}{{DISPLAYTITLE:Psi2 Aquarii}}{{Starbox begin
| name=ψ2 Aquarii
}}{{Starbox image
| image={{Location mark
|image=Aquarius constellation map.svg|alt=|float=center|width=280
|label=|position=right
|mark=Red circle.svg|mark_width=8|mark_link=ψ2 Aqr
|x=230|y=470
}}
|caption=Location of ψ2 Aquarii (circled)
}}{{Starbox observe
| epoch = J2000
| ra = {{RA|23|17|54.21372}}
| dec = {{DEC|–09|10|57.0675}}
| appmag_v = 4.403[3]
| constell = Aquarius
}}{{Starbox character
| class = B5 Vn[4]
| b-v = –0.146[3]
| u-b = –0.561[3]
| variable = λ Eri[7]
}}{{Starbox astrometry
| radial_v = -6[8]
| prop_mo_ra = +17.13
| prop_mo_dec = –11.70
| parallax = 8.12
| p_error = 0.38
| parallax_footnote =
| absmag_v = −1.04[12]
}}{{Starbox detail
| mass =
| radius = 4.6[13]
| luminosity = 565[12]
| temperature = {{nowrap|15,212 ± 288}}[13]
| metal_fe =
| rotational_velocity = 341[16]
| age_myr =
}}{{Starbox catalog
| names = ψ2 Aqr, 93 Aquarii, BD–09 6160, HD 219688, HIP 115033, HR 8858, SAO 146620.[17]
}}{{Starbox reference
|Simbad=93+Aqr
}}{{Starbox end}}Psi2 Aquarii, Latinized from ψ2 Aquarii, is the Bayer designation for a star in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent visual magnitude of 4.4.[3] Based upon parallax measurements made during the Hipparcos mission, the distance to this star is roughly {{Convert|400|ly|pc|abbr=off|lk=on}}.This is a B-type main sequence star with a stellar classification of B5 Vn.[4] The 'n' suffix indicates that the absorption lines in the spectrum are being broadened by Doppler shift from the star's rapid rotation rate. The projected rotational velocity of the star is 341 km/s.[16] Psi2 Aquarii is 4.6[13] times as large as the Sun with an effective temperature of 15,212 K[13] in its outer envelope. It is a λ Eridani variable, or periodic Be star, with a pulsation cycle lasting 1.073 days.[7] The amplitude of the variation is 0.024 in magnitude.[25] References1. ^1 2 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }}
2. ^1 2 3 4 {{citation | display-authors=1 | last1=Underhill | first1=A. B. | last2=Divan | first2=L. | last3=Prevot-Burnichon | first3=M.-L. | last4=Doazan | first4=V. | title=Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars | journal=Monthly Notices of the Royal Astronomical Society | volume=189 | pages=601–605 |date=November 1979 | bibcode=1979MNRAS.189..601U | postscript=. | doi=10.1093/mnras/189.3.601}}
3. ^1 2 {{citation | last=Lesh | first=Janet Rountree |date=December 1968 | title=The Kinematics of the Gould Belt: an Expanding Group? | journal=Astrophysical Journal Supplement | volume=17 | page=371 | doi=10.1086/190179 | bibcode=1968ApJS...17..371L | postscript=. }}
4. ^1 {{citation | last=Wilson | first=Ralph Elmer | year=1953 | title=General Catalogue of Stellar Radial Velocities | publisher=Carnegie Institution of Washington | location=Washington | bibcode=1953GCRV..C......0W | postscript=. }}
5. ^1 2 {{citation | last1=Bernacca | first1=P. L. | last2=Perinotto | first2=M. | title=A catalogue of stellar rotational velocities | journal=Contributi Osservatorio Astronomico di Padova in Asiago | volume=239 | issue=1 | year=1970 | bibcode=1970CoAsi.239....1B | postscript=. }}
6. ^1 2 3 4 {{citation | last1=Kozok | first1=J. R. | title=Photometric observations of emission B-stars in the southern Milky Way | journal=Astronomy and Astrophysics Supplement Series | volume=61 | pages=387–405 |date=September 1985 | bibcode=1985A&AS...61..387K | postscript=. }}
7. ^1 {{cite simbad | title=* 93 Aqr | accessdate=2012-07-06 | postscript=. }}
8. ^1 2 {{citation | last1=Balona | first1=L. A. | title=Tests of the Pulsation and Starspot Models for the Periodic Be-Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=277 | issue=4 | page=1547 |date=December 1995 | bibcode=1995MNRAS.277.1547B | postscript=. |doi = 10.1093/mnras/277.4.1547 }}
9. ^1 {{citation | last1=Balona | first1=L. A. | title=Short-period variability in Be stars | journal=Monthly Notices of the Royal Astronomical Society | volume=245 | pages=92–100 |date=July 1990 | bibcode=1990MNRAS.245...92B | postscript=. }}
}}External links{{Stars of Aquarius}}{{DEFAULTSORT:Psi2 Aquarii}} 9 : Henry Draper Catalogue objects|Bayer objects|Flamsteed objects|Aquarius (constellation)|B-type main-sequence stars|Hipparcos objects|HR objects|Durchmusterung objects|Lambda Eridani variables |