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HD 197027

HIP 102152 Credit: ESO/Digitized Sky Survey 2
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Capricornus
Right ascension	20 41 54.6336
Declination	−27° 12′ 57.4154″
Apparent magnitude (V)	9.15±0.02
Characteristics
Spectral type	G3 V
U−B color index	+0.30
B−V color index	+0.65
Astrometry
Radial velocity (Rv)	−43.9±0.3 km/s
Proper motion (μ)	RA: +175.628 mas/yr Dec.: −15.593 mas/yr
Parallax (π)	12.7715 ± 0.0164 mas
Distance	255.4 ± 0.3 ly (78.3 ± 0.1 pc)
Absolute magnitude (MV)	4.74
Details
Mass	0.97 M☉
Radius	1.08 −0.05 R☉
Luminosity	1.19 L☉
Surface gravity (log g)	4.40±0.02 cgs
Temperature	5718±5 K
Metallicity	−0.020±0.005 dex
Rotational velocity (v sin i)	1.78±0.12 km/s
Age	6.92±0.69 Gyr
Other designations
CD−27°14976, CPD−27°7079, HD 197027, HIP 102152, SAO 189585
Database references
SIMBAD	data

HD 197027 (HIP 102152) is a star in the constellation Capricornus. It has an apparent magnitude of 9.15, 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.

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 but 108% of its radius. It shines at 119% the luminosity of the Sun from its photosphere at an effective temperature of 5,718 K, similar to the Sun's 5,778 K. HD 197027's metallicity – elements heavier than helium – is similar to the Sun. At an older age of 6.92 billion years, it spins with a projected rotational velocity of about 2 km/s.

Since its measured properties of this star are very similar to those of the Sun, it has been considered a candidate older solar twin. The abundances of 21 elements overall are more similar to the Sun than any other known solar twin. Its Iron Abundance is -0.03 with an error value of 0.02 Fe/H. (The value comes from the Hipparcos Extended Catalog.)

Age

References

1. ^ 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.
2. ^ 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.
3. 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.
4. 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.
5. ^ 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.
6. ^ 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.
7. ^ 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.
8. ^ 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.
9. ^ 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.
10. "HD 197027". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2013-09-07.
11. ESO, The life cycle of a Sun-like star (annotated), from European Southern Observatory, 28 August 2013
12. "HD 197027 Star Distance, Age, Colour and other Facts - Universe Guide". universeguide.com. 10 January 2024. Retrieved 2024-01-19.

External links

• Oldest Solar Twin Identified
• HIGH PRECISION ABUNDANCES OF THE OLD SOLAR TWIN HIP 102152: INSIGHTS ON LI DEPLETION FROM THE OLDEST SUN
• Oldest Solar Twin Identified

v t e Constellation of Capricornus
Capricornus in Chinese astronomy List of stars in Capricornus
Stars	Bayer α (Prima Giedi) α (Algedi) β (Dabih) β γ (Nashira) δ (Deneb Algedi) ε ζ η θ ι κ λ μ ν (Alshat) ξ ξ ο ο π ρ σ τ τ υ φ χ ψ ω Flamsteed 3 4 17 19 20 21 24 (A) 27 29 30 31 33 35 36 (b) 37 41 42 44 45 46 (c) 47 (c) 50 Variable R HR 7722 7845 7898 HD 197027 202206 204313 Other HATS-3 LP 816-60
Exoplanets HD 192310 b c HD 202206 c HD 204313 b HD 202772 Ab PSO J318.5−22
Star clusters Messier 30 Palomar 12
Galaxies	NGC 6907 7016 7019 7030 7035 7035A 7073 Other IC 1337 PKS 2126-158
Galaxy clusters HCG 87
Category

• Capricornus
• Solar analogs
• G-type main-sequence stars
• Durchmusterung objects
• Henry Draper Catalogue objects
• Hipparcos objects