| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Octans |
| Right ascension | 01h 37m 28.036s[1] |
| Declination | −84° 46′ 10.62″[1] |
| Apparent magnitude (V) | 5.67±0.01[2] |
| Characteristics | |
| Spectral type | G8 III[3] |
| U−B color index | +0.66[4] |
| B−V color index | +0.94[4] |
| Astrometry | |
| Radial velocity (Rv) | 18±2[5] km/s |
| Proper motion (μ) | RA: +34.227 mas/yr[1] Dec.: +26.193 mas/yr[1] |
| Parallax (π) | 8.6392 ± 0.1495 mas[1] |
| Distance | 378 ± 7 ly (116 ± 2 pc) |
| Absolute magnitude (MV) | +0.33[6] |
| Details[7] | |
| Mass | 2.61±0.13 M☉ |
| Radius | 9.52±0.24 R☉ |
| Luminosity | 56±2 L☉ |
| Surface gravity (log g) | 2.96±0.08 cgs |
| Temperature | 5,128±46 K |
| Metallicity [Fe/H] | 0.00±0.04 dex |
| Rotational velocity (v sin i) | 7.5±1[8] km/s |
| Age | 500[9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 11025 (HR 525) is a suspected astrometric binary[10] in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.67,[2] making it visible to the naked eye if viewed under ideal conditions. Located 378 light years away,[1] it is receding with a heliocentric radial velocity of 18 km/s.[5]
The visible component is a yellow giant of spectral class G8 III.[3] At present it has 2.61 times the mass of the Sun[7] but at an age of 500 million years,[9] has expanded to 9.52 times the radius of the Sun.[7] It shines at 56 L☉ from its enlarged photosphere at an effective temperature of 5,128 K,[7] giving it a yellow glow. HD 11025 has a solar metallicity[7] and spins with a moderate projected rotational velocity of 7.5 km/s.[8]
References
- 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.
- 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.
- 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.
- 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.
- 1 2 Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication: 0. Bibcode:1953GCRV..C......0W.
- ↑ 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.
- 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.
- 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.
- 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.
- ↑ 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
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