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Binary star in the constellation Aquarius
53 Aquarii
Location of 53 Aquarii (circled)
Observation data
Epoch J2000
Equinox J2000
Constellation
Aquarius
Right ascension
22h 26m 34.2753s
[1]
Declination
–16° 44′ 31.697″
[1]
Apparent magnitude (V)
5.56
[2] (6.35/6.57)
[3]
Characteristics
Spectral type
G1 V + G5 V Fe–0.8 CH–1
[4]
U−B
color index
+0.09
[2]
B−V
color index
+0.61
[2]
Astrometry
Radial velocity (Rv ) +2.1
[5] km/s
Proper motion (μ)
RA: +200.59
[1]
mas /
yr
Dec.: +14.51
[1]
mas /
yr
Parallax (π) 49.50 ± 1.23
mas
[1]
Distance 66 ± 2
ly (20.2 ± 0.5
pc )
Absolute magnitude (MV ) 4.05
[5] (4.94/4.87)
[3]
Orbit
[6] Primary 53 Aqr A Companion 53 Aqr B
Period (P) 3500
yr
Semi-major axis (a) 14.88″
Eccentricity (e) 0.90
Inclination (i) 44.13°
Longitude of the node (Ω) 294.55°
Periastron
epoch (T) B 2023
Argument of periastron (ω) (secondary)151.40°
Details 53 Aqr A
Mass 1.01
[7]
M ☉
Radius 1.11
[8]
R ☉
Luminosity 1.39
[8]
L ☉
Surface gravity (log g ) 4.46
[3]
cgs
Temperature 5,922
[3]
K
Metallicity [Fe/H]–0.10
[3]
dex
Rotational velocity (v sin i ) 8
[9] km/s
Age 0.18–0.37
[10]
Gyr 53 Aqr B
Mass 0.99
[7]
M ☉
Surface gravity (log g ) 4.44
[3]
cgs
Temperature 5,811
[3]
K
Metallicity [Fe/H]–0.19
[3]
dex
Rotational velocity (v sin i ) 9
[9] km/s
Other designations 53 Aqr A :
BD –17 6521,
HD 212698,
HR 8545,
LTT 9026,
SAO 165078.53 Aqr B : BD–17 6520, HD 212697, HR 8544, LTT 9025, SAO 165077.
Database references
SIMBAD
53 Aqr
53 Aqr A
53 Aqr B
53 Aquarii (abbreviated 53 Aqr ) is a
binary star
[12] system in the
equatorial
constellation of
Aquarius . 53 Aquarii is its
Flamsteed designation though the star also bears the
Bayer designation of f Aquarii . The combined
apparent visual magnitude of the pair is a 5.56,
[2] making it just visible to the naked eye in
dark suburban skies . Based upon an annual
parallax shift of 49.50
milliarcseconds for the first component, this system is located at a distance of approximately 65
light-years (20
parsecs ) from Earth.
[1]
This is a wide binary star system with a
projected separation of 100
astronomical units ; indicating that the two stars are at least this distance apart.
[8] The primary component is a
solar-type
main sequence star with a
stellar classification of G1 V.
[4] It has about 99% of the Sun's mass, 111% of the Sun's radius, and shines with 139% of the luminosity of the Sun.
[8] This energy is being emitted from an
outer envelope at an
effective temperature of 5,922 K,
[3] giving it the golden hue of a
G-type star .
[13] An examination of the primary component with the
Spitzer Space Telescope failed to detect any
infrared excess that might otherwise be an indication of a circumstellar
debris disk .
[8]
The companion is a slightly cooler star with an effective temperature of 5,811 K.
[3] It has a stellar classification of G5 V Fe–0.8 CH–1,
[4] indicating it is a
chemically peculiar
G-type main sequence star showing an under-abundance of iron and the molecule CH in its
spectrum . As of 2008, it has an
angular separation of 1.325
arcseconds along a
position angle of 30.9° from the primary.
[14]
This system is
coeval with the
Castor Moving Group of stars that share a common motion through space; hence it is a candidate member of that association. This suggests that the system is young; its estimated age is in the range of 180 to 370 million years, based upon the spectrum and
X-ray luminosity , respectively.
[10]
References
^
a
b
c
d
e
f 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 .
^
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 .
^
a
b
c
d
e
f
g
h
i
j Pasquini, L.; Liu, Q.; Pallavicini, R. (July 1994), "Lithium abundances of nearby solar-like stars", Astronomy and Astrophysics , 287 (1): 191–205,
Bibcode :
1994A&A...287..191P .
^
a
b
c 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 .
^
a
b Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics , 418 : 989–1019,
arXiv :
astro-ph/0405198 ,
Bibcode :
2004A&A...418..989N ,
doi :
10.1051/0004-6361:20035959 ,
S2CID
11027621 .
^
"Sixth Catalog of Orbits of Visual Binary Stars" . United States Naval Observatory. Archived from
the original on 1 August 2017. Retrieved 3 June 2017 .
^
a
b Cvetkovic, Z.; Ninkovic, S. (2010).
"On the Component Masses of Visual Binaries" . Serbian Astronomical Journal . 180 (180): 71–80.
Bibcode :
2010SerAJ.180...71C .
doi :
10.2298/SAJ1080071C .
^
a
b
c
d
e Plavchan, Peter; et al. (June 2009), "New Debris Disks Around Young, Low-Mass Stars Discovered with the Spitzer Space Telescope", The Astrophysical Journal , 698 (2): 1068–1094,
arXiv :
0904.0819 ,
Bibcode :
2009ApJ...698.1068P ,
doi :
10.1088/0004-637X/698/2/1068 ,
S2CID
51417657 .
^
a
b Torres, C. A. O.; et al. (December 2006), "Search for associations containing young stars (SACY). I. Sample and searching method", Astronomy and Astrophysics , 460 (3): 695–708,
arXiv :
astro-ph/0609258 ,
Bibcode :
2006A&A...460..695T ,
doi :
10.1051/0004-6361:20065602 ,
S2CID
16080025 .
^
a
b Maldonado, J.; et al. (October 2010), "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups", Astronomy and Astrophysics , 521 : A12,
arXiv :
1007.1132 ,
Bibcode :
2010A&A...521A..12M ,
doi :
10.1051/0004-6361/201014948 ,
S2CID
119209183 .
^
"53 Aqr" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2012-07-14 . See also the children entries.
^ 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 .
^
"The Colour of Stars" , Australia Telescope, Outreach and Education ,
Commonwealth Scientific and Industrial Research Organisation , December 21, 2004, archived from
the original on March 18, 2012, retrieved 2012-01-16 .
^ Tokovinin, A.; Cantarutti, R. (February 2008), "First Speckle Interferometry at SOAR Telescope with Electron-Multiplication CCD", Publications of the Astronomical Society of the Pacific , 120 (864): 170–177,
Bibcode :
2008PASP..120..170T ,
doi :
10.1086/528809 .