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Star in the constellation Sagittarius
HD 165185 is the
Henry Draper Catalogue designation for a star in the southern
zodiac
constellation of
Sagittarius . It has an
apparent visual magnitude of 5.94,
[2] which indicates it is a sixth magnitude star that is faintly visible to the naked eye. (According to the
Bortle scale , it can be viewed from dark suburban skies.)
Parallax measurements give an estimated distance of 55.8
light years from the Sun.
[1] It is drifting further away with a heliocentric
radial velocity of +15.4 km/s.
[2]
This star is a
pre-main-sequence
[11]
solar analog
[12] with a
stellar classification of G1 V.
[2] It is spinning with a
projected rotational velocity of 7.53 km/s
[8] and a rotation period of 5.9 days.
[6] Measurements of magnetic activity in the
chromosphere show variations over time, much like the
sunspot cycle . This activity showed a distinct peak in 2009.
[13] Stellar models give an estimated mass equal to 1.13
[5] times the
mass of the Sun , but only 94%
[6] of the
Sun's radius . The total, or
bolometric
luminosity of the star is 15% higher than the Sun,
[7] while the abundance of elements other than hydrogen and helium—what astronomer's term the
metallicity —is nearly the same as in the Sun.
[8] The
stellar atmosphere has an
effective temperature of 5,940
[8] K, giving it the yellow-hued glow of a
G-type star .
[14]
HD 165185 completed its
perihelion passage some 851,000 years ago when it came within 29 ly (8.9 pc) of the Sun,
[15] and it is now moving away with a
radial velocity
component of 15.4 km/s.
[2] Based upon the motion of this star through space, its age, and properties, this star is a probable member of the
Ursa Major Moving Group ; a
stellar kinematic group that formed in the same region of space.
[11] It has a suspected
common proper motion companion at an
angular separation of 12
″ , corresponding to a
projected separation of 220
AU . This is a
red dwarf star with a stellar classification of M0 and an infrared
K band magnitude of 8.11.
[16]
References
^
a
b
c
d
e
Brown, A. G. A. ; et al. (Gaia collaboration) (2021).
"Gaia Early Data Release 3: Summary of the contents and survey properties" .
Astronomy & Astrophysics . 649 : A1.
arXiv :
2012.01533 .
Bibcode :
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doi :
10.1051/0004-6361/202039657 .
S2CID
227254300 . (Erratum:
doi :
10.1051/0004-6361/202039657e ) .
Gaia EDR3 record for this source at
VizieR .
^
a
b
c
d
e
f
g Torres, C. A. O.; et al. (December 2006). "Search for associations containing young stars (SACY). I. Sample and searching method".
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arXiv :
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Bibcode :
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S2CID
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^
a
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Bibcode :
1970MNRAS.148....1S ,
doi :
10.1093/mnras/148.1.1 .
^ Eggen, Olin J. (August 1998), "The Sirius Supercluster and Missing Mass near the Sun", The Astronomical Journal , 116 (2): 782–788,
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doi :
10.1086/300465 .
^
a
b
c 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 :
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Bibcode :
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doi :
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^
a
b
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arXiv :
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S2CID
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^
a
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S2CID
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^ B. A., Gould (1879),
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^
"HD 165185 -- Pre-main sequence Star" , SIMBAD Astronomical Database ,
Centre de Données astronomiques de Strasbourg .
^
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b Nakajima, Tadashi; Morino, Jun-Ichi (January 2012), "Potential Members of Stellar Kinematic Groups within 30 pc of the Sun", The Astronomical Journal , 143 (1): 2,
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^ Gaidos, Eric J.; Gonzalez, Guillermo (July 2002), "Stellar atmospheres of nearby young solar analogs", New Astronomy , 7 (5): 211–226,
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S2CID
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^ Metcalfe, T. S.; et al. (September 2009), "Activity Cycles of Southern Asteroseismic Targets", Proceedings of the "Solar Analogs II" workshop ,
arXiv :
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^
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^ Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics , 575 : 13,
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S2CID
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^ Chini, R.; et al. (January 2014), "New visual companions of solar-type stars within 25 pc", Monthly Notices of the Royal Astronomical Society , 437 (1): 879–886,
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