HD 41004
Encyclopedia
HD 41004 is a star system
approximately 139 light years away in the constellation
of Pictor
.
star
of spectral type K1V and apparent magnitude
8.65.
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
.
star with spectral type M2V and apparent magnitude 12.33.
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.
Star system
A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems.-Binary star systems:A stellar...
approximately 139 light years away in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
of Pictor
Pictor
Pictor is a small and faint constellation in the southern sky , located between the brilliant star Canopus and the Large Magellanic Cloud. Its name is Latin for painter, but it is in fact an abbreviation of its original name Equuleus Pictoris, the 'painter's easel', and it is normally represented...
.
HD 41004 A
HD 41004 A is a primary orange dwarfOrange dwarf
A K-type main-sequence star , also referred to orange dwarf, are main-sequence stars of spectral type K and luminosity class V. These stars are intermediate in size between red M-type main-sequence stars and yellow G-type main-sequence stars...
star
Star
A star is a massive, luminous sphere of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth...
of spectral type K1V and apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
8.65.
Planetary system
In 2003 a planet HD 41004 AbHD 41004 Ab
HD 41004 Ab is an extrasolar planet approximately 139 light years away in the constellation of Pictor. It has mass 2.56 MJ planet orbiting at a distance of 1.70 AU from HD 41004 A. The planet's orbit is highly eccentric caused by the companion star HD 41004 B and the distance ranges from 0.44 to...
was first discovered by Zucker, but not published until 2004. It has a mass >2.56 times that of Jupiter
Jupiter
Jupiter is the fifth planet from the Sun and the largest planet within the Solar System. It is a gas giant with mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in our Solar System combined. Jupiter is classified as a gas giant along with Saturn,...
. It orbits at 1.70 astronomical units, taking 963 days, with 74% eccentricity
Orbital eccentricity
The orbital eccentricity of an astronomical body is the amount by which its orbit deviates from a perfect circle, where 0 is perfectly circular, and 1.0 is a parabola, and no longer a closed orbit...
.
HD 41004 B
HD 41004 B is a red dwarfRed dwarf
According to the Hertzsprung-Russell diagram, a red dwarf star is a small and relatively cool star, of the main sequence, either late K or M spectral type....
star with spectral type M2V and apparent magnitude 12.33.
Brown dwarf
HD 41004 Bb is a brown dwarfBrown dwarf
Brown dwarfs are sub-stellar objects which are too low in mass to sustain hydrogen-1 fusion reactions in their cores, which is characteristic of stars on the main sequence. Brown dwarfs have fully convective surfaces and interiors, with no chemical differentiation by depth...
disguised as a planet
Extrasolar planet
An extrasolar planet, or exoplanet, is a planet outside the Solar System. A total of such planets have been identified as of . It is now known that a substantial fraction of stars have planets, including perhaps half of all Sun-like stars...
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.