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Star in the constellation Capricornus
HD 197027 (HIP 102152) is a
star in the
constellation
Capricornus . It has an
apparent magnitude of 9.15,
[2] making it readily visible through a
telescope but not to the
naked eye . The object is located at a distance of 255
light years but is approaching the
Solar System with a heliocentric
radial velocity of −44
km/s .
[5]
HD 197027 has a
stellar classification of G3 V, indicating that it is an ordinary
G-type main-sequence star like the
Sun . It has only 97% the
mass of the Sun
[7] but 108% of its radius.
[8] It shines at 119% the
luminosity of the Sun
[6] from its
photosphere at an
effective temperature of 5,718
K ,
[9] similar to the Sun's 5,778 K. HD 197027's
metallicity – elements heavier than
helium – is similar to the Sun.
[9] At an older age of 6.92
billion years , it spins with a
projected rotational velocity of about 2
km/s .
[9]
Since its measured properties of this star are very similar to those of the Sun, it has been considered a candidate older
solar twin .
[11] The abundances of 21
elements overall are more similar to the Sun than any other known solar twin. [
citation needed ] Its Iron Abundance is -0.03 with an error value of 0.02 Fe/H. (The value comes from the Hipparcos Extended Catalog.)
[12]
Age
The age of HD 197027, here annotated as HIP 102152, shown relative to the Sun, the younger solar twin
18 Scorpii and the formation of the
Milky Way
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 :
2021A&A...649A...1G .
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 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics . 355 : L27–L30.
Bibcode :
2000A&A...355L..27H .
ISSN
0004-6361 .
^ Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0 .
Bibcode :
1982mcts.book.....H .
^ Paunzen, E. (May 2022).
"Catalogue of stars measured in the Geneva seven-colour photometric system" . Astronomy & Astrophysics . 661 : A89.
arXiv :
2111.04810 .
Bibcode :
2022A&A...661A..89P .
doi :
10.1051/0004-6361/202142355 .
eISSN
1432-0746 .
ISSN
0004-6361 .
^
a
b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters . 32 (11): 759–771.
arXiv :
1606.08053 .
Bibcode :
2006AstL...32..759G .
doi :
10.1134/S1063773706110065 .
eISSN
1562-6873 .
ISSN
1063-7737 .
S2CID
119231169 .
^
a
b
c Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331–346.
arXiv :
1108.4971 .
Bibcode :
2012AstL...38..331A .
doi :
10.1134/S1063773712050015 .
ISSN
1063-7737 .
S2CID
255204555 .
^
a
b Talawanda R. Monroe; et al. (Aug 2013). "High Precision Abundances of the Old Solar Twin HIP 102152: Insights on Li Depletion from the Oldest Sun". Astrophysical Journal Letters . 774 (2): L32.
arXiv :
1308.5744 .
Bibcode :
2013ApJ...774L..32M .
doi :
10.1088/2041-8205/774/2/l32 .
S2CID
56111132 .
^
a
b Stassun, Keivan G.; et al. (9 September 2019).
"The Revised TESS Input Catalog and Candidate Target List" . The Astronomical Journal . 158 (4): 138.
arXiv :
1905.10694 .
Bibcode :
2019AJ....158..138S .
doi :
10.3847/1538-3881/ab3467 .
ISSN
0004-6256 .
^
a
b
c
d
e
f
g
h dos Santos, Leonardo A.; et al. (August 2016), "The Solar Twin Planet Search. IV. The Sun as a typical rotator and evidence for a new rotational braking law for Sun-like stars", Astronomy & Astrophysics , 592 : 8,
arXiv :
1606.06214 ,
Bibcode :
2016A&A...592A.156D ,
doi :
10.1051/0004-6361/201628558 ,
S2CID
53533614 , A156.
^
"HD 197027" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2013-09-07 .
^
ESO, The life cycle of a Sun-like star (annotated) , from
European Southern Observatory , 28 August 2013
^
"HD 197027 Star Distance, Age, Colour and other Facts - Universe Guide" . universeguide.com . 10 January 2024. Retrieved 2024-01-19 .
External links