HD 41004

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HD 41004 is a star system approximately 139 light years away in the constellation of Pictor.

HD 41004 A[edit]

HD 41004 A
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pictor
Right ascension 05h 59m 49.64s
Declination −48° 14′ 22.89″
Apparent magnitude (V) 8.65
Absolute magnitude (V) 5.51
Distance 138.6 ly
(42.5 pc)
Spectral type K1V
Other designations
CD−48° 2083, HIP 28393, SAO 217660
Database references

HD 41004 A is a primary orange dwarf star of spectral type K1V and apparent magnitude 8.65.

Planetary system[edit]

In 2003 a planet HD 41004 Ab was first discovered by Zucker, but not published until 2004. It has a mass >2.56 times that of Jupiter. It orbits at 1.70 astronomical units, taking 963 days, with 74% eccentricity.

The HD 41004 A planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b >2.56 MJ 1.70 963 0.74

HD 41004 B[edit]

HD 41004 B
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pictor
Right ascension 05h 59m 49.65s
Declination −48° 14′ 22.90″
Apparent magnitude (V) 12.33
Absolute magnitude (V) 9.16
Distance 140.35 ly
(43.03 pc)
Spectral type M2V
Database references

HD 41004 B is a red dwarf with spectral type M2V and apparent magnitude 12.33.

Brown dwarf[edit]

HD 41004 Bb
Discovered by Zucker et al.
Discovery date 2004
radial velocity
Orbital characteristics
0.0177 AU
Eccentricity 0.081±0.012
1.3283±1.2e-5 d
145 km/s
0.411 mas
2452434.88±0.0029 JD
Semi-amplitude 6114±71 m/s
Physical characteristics
Mass ~16 MJ (most probable)[1]
< ~25 MJ[1]

HD 41004 Bb is a brown dwarf that at the time of the discovery was orbiting closer to the star than any known extrasolar planet or brown dwarf (a=0.0177 AU), at only 145 km/s, because of its low-mass parent star, taking 1.3 days. Its orbit is circular despite the gravitational effect of HD 41004 A because of the tidal effect of the nearby star HD 41004 B.[1]


  1. ^ a b c Santos, N. C.; Mayor, M.; Naef, D.; Pepe, F.; Queloz, D.; Udry, S.; Burnet, M.; Clausen, J. V.; Helt, B. E.; Olsen, E. H.; Pritchard, J. D. (2002). "The CORALIE survey for southern extra-solar planets. IX. A 1.3-day period brown dwarf disguised as a planet". Astronomy and Astrophysics. 392 (1): 215–229. arXiv:astro-ph/0206213Freely accessible. Bibcode:2002A&A...392..215S. doi:10.1051/0004-6361:20020876. 

Further reading[edit]

  • Zucker, S.; Mazeh, T.; Santos, N. C.; Udry, S.; Mayor, M. (2004). "Multi-order TODCOR: Application to observations taken with the CORALIE echelle spectrograph. II. A planet in the system HD 41004". Astronomy and Astrophysics. 426 (2): 695–698. Bibcode:2004A&A...426..695Z. doi:10.1051/0004-6361:20040384. 

External links[edit]

  • "HD 41004 A". The Extrasolar Planets Encyclopaedia. Retrieved 2008-07-21. 
  • "HD 41004 B". The Extrasolar Planets Encyclopaedia. Retrieved 2008-07-21. 

Coordinates: Sky map 05h 59m 49.64s, −48° 14′ 22.89″