HD 36584

HD 36584
Location of HD 36584 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Dorado
A
Right ascension 05h 26m 59.80322s[1]
Declination −68° 37′ 21.1327″[1]
Apparent magnitude (V) 6.62±0.01[2]
B
Right ascension 05h 26m 59.87970s[3]
Declination −68° 37′  22.4439″[3]
Apparent magnitude (V) 6.91±0.01[2]
Characteristics
Spectral type F0 IV/V[4]
A
B−V color index +0.37[5]
B
B−V color index +0.40[5]
Astrometry
Radial velocity (Rv)−4.60±3.4[6] km/s
Absolute magnitude (MV)+1.57[7]
A
Proper motion (μ) RA: −10.638 mas/yr[1]
Dec.: −17.846 mas/yr[1]
Parallax (π)12.4037 ± 0.0261 mas[1]
Distance263.0 ± 0.6 ly
(80.6 ± 0.2 pc)
B
Proper motion (μ) RA: −4.710 mas/yr[3]
Dec.: −19.675 mas/yr[3]
Parallax (π)12.4171 ± 0.0384 mas[3]
Distance262.7 ± 0.8 ly
(80.5 ± 0.2 pc)
Orbit[8]
Period (P)795 yr
Semi-major axis (a)1.704″
Eccentricity (e)0.887
Inclination (i)129.5°
Longitude of the node (Ω)74.8°
Periastron epoch (T)2,403,927.97472 JD
Argument of periastron (ω)
(secondary)		112.8°
Details
A
Mass1.69[9] M☉
B
Mass1.57[9] M☉
Other designations
24 G. Doradus[10], CD−68°308, CPD−68°375, GC 6795, HD 36584, HIP 25482, HR 1859, SAO 249281, CCDM J05270-6837AB, WDS J05270-6837AB[11]
Database references
SIMBADthe system
A
B

HD 36584 (HR 1859; 24 G. Doradus) is a visual binary located in the southern constellation Dorado. The primary has an apparent magnitude of 6.62 and the secondary has an apparent magnitude of 6.91,[2] making both stars visible in a telescope but not to the naked eye. The system is located relatively close at a distance of 263 light-years based on Gaia DR3 parallax measurements[1][3] and it is drifting closer with a heliocentric radial velocity of −4.6 km/s.[6] The system has a combined absolute magnitude of 1.57.[7]

HD 36584 was first discovered to be a double star in 1898 by astronomer R.T.A Innes. At the time of discovery, the components had a separation of only half an arcsecond and the secondary was located at a position angle of 210°.[12] The separation between the components increased to 1.34" and the position angle of the secondary shifted to 162° in 1997. At this separation, the components can be resolved in an amateur telescope, but the individual characteristics of both stars cannot be studied. As of 2015, the secondary is located at a distance of 1.4" along a position angle of 159°.[13] The two stars take about 795 years to circle each other in a very eccentric orbit.[8]

The system has a combined stellar classification of F0 IV/V,[4] indicating that it is an evolved F-type star that has the blended luminosity class of a subgiant and main sequence star. The components have masses 1.69 and 1.57 times that of the Sun respectively.[9]

  1. ^ a b c d e Cite error: The named reference GaiaDR3A was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Fabricius2002 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference GaiaDR3B was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Fabricius2000 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Zirm2013 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Chulkov2022 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gill1898 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).