HD 41004

HD 41004
Observation data
Epoch J2000      Equinox J2000
Constellation Pictor
Right ascension 05h 59m 49.65018s[1]
Declination −48° 14′ 22.8883″[1]
Apparent magnitude (V) 8.65[2] (8.82 + 12.51)[3]
Characteristics
Spectral type K1V + M2V[4]
B−V color index 0.887±0.013[2]
Astrometry
Radial velocity (Rv)+42.36±0.14[1] km/s
Proper motion (μ) RA: −43.418(115) mas/yr[1]
Dec.: +65.333(123) mas/yr[1]
Parallax (π)25.6106 ± 0.1043 mas[1]
Distance127.4 ± 0.5 ly
(39.0 ± 0.2 pc)
Absolute magnitude (MV)5.60[2]
Details[5]
A
Mass0.89±0.07 M☉
Radius1.04+0.02
−0.03[6] R☉
Luminosity0.629±0.008[6] L☉
Surface gravity (log g)4.34±0.11 cgs
Temperature5,255±52 K
Metallicity [Fe/H]0.15±0.03 dex
Rotational velocity (v sin i)1.0±1.2[7] km/s
B
Mass0.4[8] M☉
Other designations
CD−48°2083, HD 41004, HIP 28393, SAO 217660, PPM 310291, WDS J05598-4814[9]
Database references
SIMBADdata

HD 41004 is a visual binary[4] star system in the southern constellation of Pictor. It is too faint to be visible to the naked eye, having a combined apparent visual magnitude of 8.65.[2] The two components have a magnitude difference of 3.7, and share a common proper motion[4] with an angular separation of 0.30″, as of 2018.[3] The distance to this system is approximately 127 light-years based on parallax.[1] It is drifting further away from the Sun with a radial velocity of +42.5 km/s, having come to within 44.5 ly some 831,000 years ago.[2]

The primary, component A, is a K-type main-sequence star with a stellar classification of K1V[4] and a visual magnitude of 8.82.[3] Torres et al. (2006) classed it as a K1IV star,[7] suggesting it is a subgiant star that is evolving off the main sequence. It has 89%[4] of the mass of the Sun and 104%[6] of the Sun's radius. The star is radiating 63%[6] of the Sun's luminosity from its photosphere at an effective temperature of 5,255 K.[4] Its smaller companion, designated component B, is a red dwarf with spectral type M2V[4] and apparent magnitude 12.33. It has a projected separation of 23 AU from the primary.[4]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Mason2014 was invoked but never defined (see the help page).
  4. ^ a b c d e f g h Cite error: The named reference Zucker2004 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Sousa2018 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Torres2006 was invoked but never defined (see the help page).
  8. ^ Quarles, Billy; Li, Gongjie; Kostov, Veselin; Haghighipour, Nader (2020), "Orbital Stability of Circumstellar Planets in Binary Systems", The Astronomical Journal, 159 (3): 80, arXiv:1912.11019, Bibcode:2020AJ....159...80Q, doi:10.3847/1538-3881/ab64fa, S2CID 209444271
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).