HD 41004

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

HD 41004 A

HD 41004 A
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pictor
Right ascension 5h 59m 49.64s
Declination −48° 14' 22.89″
Apparent magnitude (V) 8.65
Absolute magnitude (V)5.51
Distance138.6 ly
(42.5 pc)
Spectral typeK1V
Other designations
Database references
SIMBADdata

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

Planetary system

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
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >2.56 MJ 1.70 963 0.74 — —

HD 41004 B

HD 41004 B
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pictor
Right ascension 5h 59m 49.65s
Declination −48° 14' 22.90″
Apparent magnitude (V) 12.33
Absolute magnitude (V)9.16
Distance140.35 ly
(43.03 pc)
Spectral typeM2V
Database references
SIMBADdata

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

Brown dwarf

HD 41004 Bb
Discovery
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
178.5±7.8°
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]

    References

    1. 1 2 3 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. Bibcode:2002A&A...392..215S. arXiv:astro-ph/0206213 Freely accessible. doi:10.1051/0004-6361:20020876.

    Further reading

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


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