HD 41004

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

HD 41004 A

Starbox short
name = HD 41004 A
epoch = J2000.0
constell = Pictor
ra = 5^h 59^m 49.64^s
dec = -48º 14' 22.89″
appmag_v = 8.65
absmag_v = 5.51
dist_ly = 138.6
dist_pc = 42.5
spectral = K1V
names = HIP 28393, SAO 217660
Simbad = HD+41004+A

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 it didn’t published until 2004. It has mass >2.56 times that of Jupiter. It orbits at 1.70 astronomical units, taking 963 days to orbit the star with 74% eccentricity. The discovery of the brown dwarf HD 41004 Bb around companion star was disguised as an extrasolar planet would have made even architecture.

PlanetboxOrbit
exoplanet = b
mass = >2.56
period = 963
semimajor = 1.70
eccentricity = 0.74

HD 41004 B

Starbox short
name = HD 41004 B
epoch = J2000.0
constell = Pictor
ra = 5^h 59^m 49.65^s
dec = -48º 14' 22.90″
spectral = M2V
appmag_v = 12.33
absmag_v = 9.16
dist_ly = 140.35
dist_pc = 43.03
names = n/a
Simbad = HD+41004+B

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

Brown dwarf

Infobox Planet
bgcolour = #A0B0FF
name = HD 41004 Bb
discovery = yes
discoverer = Zucker et al.
discovered = 2004
discovery_method = radial velocity
semimajor = 0.0177 AU
periastron = 0.0163 AU
apastron = 0.0191 AU
avg_speed = 145 km/s
eccentricity = 0.081±0.012
period = 1.3283±1.2e-5 d
angular_dist = 0.411 mas
long_periastron = 178.5±7.8°
time_periastron = 2452434.88±0.0029 JD
semi-amplitude = 6114±71 m/s
physical_characteristics = yes
mass = >18.4 "M"_J

HD 41004 Bb is a brown dwarf disguised as a planet that orbits closest to the star than any known extrasolar planets and brown dwarfs (a=0.0177 AU). Though it orbits only 145 km/s because of its low-mass parent star and takes 1.3 days. It's orbit is circular despite the gravitational effect of HD 41004 A because of its tidal effect of the nearby star HD 41004 B.

References

* cite journal |url=http://adsabs.harvard.edu/abs/2004A%26A...426..695Z |author=Zucker, S.; Mazeh, T.; Santos, N. C.; Udry, S.; Mayor, M.
title=Multi-order TODCOR: Application to observations taken with the CORALIE echelle spectrograph. II. A planet in the system HD 41004 |journal=A&A |year=2004 |volume=426 |pages=695–698
*

External links

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