HD 31093

HD 31093, also known as HR 1559, is a visual binary located in the southern constellation Caelum, the chisel. The components have a combined apparent magnitude of 5.83,[2] making it faintly visible to the naked eye. Based on parallax measurements from the Hipparcos spacecraft, the system is estimated to be 268 light years distant.[1] They appear to be receding from the Solar System with a heliocentric radial velocity of 24 km/s.[5]

HD 31093
Observation data
Epoch J2000      Equinox J2000
Constellation Caelum
Right ascension 04h 51m 28.21644s[1]
Declination −34° 54′ 22.6341″[1]
Apparent magnitude (V) 5.83±0.01[2]
Characteristics
Spectral type A1V + A4V[3]
U−B color index +0.09[4]
B−V color index +0.08[4]
Astrometry
Radial velocity (Rv)+24±1.8[5] km/s
Proper motion (μ) RA: 24.90±0.33[1] mas/yr
Dec.: −22.68±0.48[1] mas/yr
Parallax (π)12.17 ± 0.41 mas[1]
Distance268 ± 9 ly
(82 ± 3 pc)
Absolute magnitude (MV)+1.25[6] (combined)
Orbit
Period (P)43.36±4.34[7] yr
Semi-major axis (a)0.248±0.015[7]″
Eccentricity (e)0.852[7]
Inclination (i)107±1[3]°
Longitude of the node (Ω)20±2[3]°
Argument of periastron (ω)
(secondary)		109±2[3]°
Details
HD 31093 A
Mass1.85 ± 0.21[3] M☉
HD 31093 B
Mass1.58 ± 0.18[3] M☉
Other designations
19 G. Caeli[8], CD−35°1962, CPD−35°551, FK5 2364, GC 5939, HD 31093, HIP 22573, HR 1559, SAO 195357, WDS J04515-3454AB[9]
Database references
SIMBADdata

The components have stellar classifications of A1 and A4 V, indicating that both of them are A-type main-sequence stars. Since the components have a separation of 1⁄4 arcseconds, it is difficult to distinguish individually through a telescope. The primary has a mass 1.85 times that of the Sun while the secondary has a mass of 1.58 M☉.[3] They take 43 years to circle each other in an eccentric orbit.[7]

References
  1. van Leeuwen, Floor (13 August 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. eISSN 1432-0746. ISSN 0004-6361. Hipparcos 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. Docobo, J. A.; Andrade, M. (26 October 2012). "Dynamical and physical properties of 22 binaries discovered by W. S. Finsen". Monthly Notices of the Royal Astronomical Society. 428 (1): 321–339. Bibcode:2013MNRAS.428..321D. doi:10.1093/mnras/sts045. eISSN 1365-2966. ISSN 0035-8711.
  4. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M
  5. Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889–896. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. eISSN 1521-3994. ISSN 0004-6337. S2CID 119323941.
  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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
  7. Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (October 2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774. eISSN 1432-0746. ISSN 0004-6361.
  8. Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  9. "HD 31093". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 September 2022.
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