HD 31093

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

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]

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]

  1. ^ a b c d e f Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference Docobo2013 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Kharchenko2007 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Malkov2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).