HD 31093
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Caelum[1] |
| Right ascension | 04h 51m 28.21644s[2] |
| Declination | −34° 54′ 22.6341″[2] |
| Apparent magnitude (V) | 5.83±0.01[3] |
| Characteristics | |
| Spectral type | A1V + A4V[4] |
| U−B color index | +0.09[5] |
| B−V color index | +0.08[5] |
| Astrometry | |
| Radial velocity (Rv) | +24±1.8[6] km/s |
| Proper motion (μ) | RA: 24.90±0.33[2] mas/yr Dec.: −22.68±0.48[2] mas/yr |
| Parallax (π) | 12.17±0.41 mas[2] |
| Distance | 268 ± 9 ly (82 ± 3 pc) |
| Absolute magnitude (MV) | +1.25[1] (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[4]° |
| Longitude of the node (Ω) | 20±2[4]° |
| Argument of periastron (ω) (secondary) | 109±2[4]° |
| Details | |
| HD 31093 A | |
| Mass | 1.85 ± 0.21[4] M☉ |
| HD 31093 B | |
| Mass | 1.58 ± 0.18[4] 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 | |
| SIMBAD | data |
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,[3] 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.[2] They appear to be receding from the Solar System with a heliocentric radial velocity of 24 km/s.[6]
This star was designated Eta1 Caeli by Johann Elert Bode in his 1801 Urnaographia, but this is now no longer used.[10]
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☉.[4] They take 43 years to circle each other in an eccentric orbit.[7]
References
[edit]- 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
- 1 2 3 4 5 6 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.
- 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 3 4 5 6 7 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.
- 1 2 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M
- 1 2 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.
- 1 2 3 4 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.
- ↑ 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.
- ↑ "HD 31093". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 September 2022.
- ↑ E-Rara.ch, 2026
