HD 11025

HD 11025
Observation data
Epoch J2000.0      Equinox ICRS
Constellation Octans
Right ascension 01h 37m 28.036s
Declination −84° 46′ 10.62″
Apparent magnitude (V) 5.67±0.01
Characteristics
Spectral type G8 III
U−B color index +0.66
B−V color index +0.94
Astrometry
Radial velocity (Rv)18±2 km/s
Proper motion (μ) RA: +34.227 mas/yr
Dec.: +26.193 mas/yr
Parallax (π)8.6392±0.1495 mas
Distance378 ± 7 ly
(116 ± 2 pc)
Absolute magnitude (MV)+0.33
Details
Mass2.61±0.13 M☉
Radius9.52±0.24 R☉
Luminosity56±2 L☉
Surface gravity (log g)2.96±0.08 cgs
Temperature5,128±46 K
Metallicity [Fe/H]0.00±0.04 dex
Rotational velocity (v sin i)7.5±1 km/s
Age500 Myr
Other designations
4 G. Octantis, CPD−85°17, FK5 916, GC 2092, HD 11025, HIP 7568, HR 525, SAO 258273
Database references
SIMBADdata

HD 11025 (HR 525) is a suspected astrometric binary in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.67, making it visible to the naked eye if viewed under ideal conditions. Located 378 light years away, it is receding with a heliocentric radial velocity of 18 km/s.

The visible component is a yellow giant of spectral class G8 III. At present it has 2.61 times the mass of the Sun but at an age of 500 million years, has expanded to 9.52 times the radius of the Sun. It shines at 56 L☉ from its enlarged photosphere at an effective temperature of 5,128 K, giving it a yellow glow. HD 11025 has a solar metallicity and spins with a moderate projected rotational velocity of 7.5 km/s.

References

  1. 1 2 3 4 5 6 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. 1 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. 1 2 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
  4. 1 2 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. 1 2 Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication: 0. Bibcode:1953GCRV..C......0W.
  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 119257644.
  7. 1 2 3 4 5 Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (January 2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy & Astrophysics. 657: A87. arXiv:2201.01528. Bibcode:2022A&A...657A..87O. doi:10.1051/0004-6361/202040078. ISSN 0004-6361.
  8. 1 2 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
  9. 1 2 Demarque, Pierre; Woo, Jong-Hak; Kim, Yong-Cheol; Yi, Sukyoung K. (December 2004). "Y 2 Isochrones with an Improved Core Overshoot Treatment". The Astrophysical Journal Supplement Series. 155 (2): 667–674. arXiv:astro-ph/0409024. Bibcode:2004ApJS..155..667D. doi:10.1086/424966. ISSN 1538-4357.
  10. ↑ 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