HD 41004
HD 41004 is a star system approximately 139 light years away in the constellation of Pictor.
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 |
| 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.
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.
| 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
| 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 | |
n/a | |
| Database references | |
| SIMBAD | data |
HD 41004 B is a red dwarf with spectral type M2V and apparent magnitude 12.33.
Brown dwarf
| 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 | |
Average orbital speed | 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 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. arXiv:astro-ph/0206213
. Bibcode:2002A&A...392..215S. doi:10.1051/0004-6361:20020876.
- 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
- "HD 41004 A". The Extrasolar Planets Encyclopaedia. Retrieved 2008-07-21.
- "HD 41004 B". The Extrasolar Planets Encyclopaedia. Retrieved 2008-07-21.
Coordinates: 
05h 59m 49.64s, −48° 14′ 22.89″