HD 41004 is a star system approximately 139 light years away in the constellation of Pictor.
Contents |
| 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 |
| Distance | 138.6 ly (42.5 pc) |
| Spectral type | K1V |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 41004 A is a primary orange dwarf star of spectral type K1V and apparent magnitude 8.65.
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.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| b | >2.56 MJ | 1.70 | 963 | 0.74 |
| 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 |
| Distance | 140.35 ly (43.03 pc) |
| Spectral type | M2V |
| Other designations | |
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n/a
|
|
| Database references | |
| SIMBAD | data |
HD 41004 B is a red dwarf star with spectral type M2V and apparent magnitude 12.33.
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Discovery
|
|
|---|---|
| Discovered by | Zucker et al. |
| Discovery date | 2004 |
| Detection method | radial velocity |
| Semi-major axis | 0.0177 AU |
| Eccentricity | 0.081±0.012 |
| Orbital period | 1.3283±1.2e-5 d |
| Average orbital speed | 145 km/s |
| Angular distance | 0.411 mas |
| Longitude of periastron | 178.5±7.8° |
| Time of periastron | 2452434.88±0.0029 JD |
| Semi-amplitude | 6114±71 m/s |
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Physical characteristics
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| Mass | >18.4 MJ |
HD 41004 Bb is a brown dwarf disguised as a planet that orbits closer to the star than any known extrasolar planets and brown dwarfs (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 its tidal effect of the nearby star HD 41004 B.