Astronomy:HD 11025
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Short description: G-type star in the constellation Octans
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| 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[1] mas/yr Dec.: +26.193[1] mas/yr |
| Parallax (π) | 8.6392 ± 0.1495[1] mas |
| 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 solar luminosity 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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 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.
- ↑ 5.0 5.1 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" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 7.3 7.4 Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V. et al. (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. doi:10.1051/0004-6361/202040078. ISSN 0004-6361. Bibcode: 2022A&A...657A..87O.
- ↑ 8.0 8.1 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. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D.
- ↑ 9.0 9.1 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. doi:10.1086/424966. ISSN 1538-4357. Bibcode: 2004ApJS..155..667D.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E
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