Helmi stream
Encyclopedia
The Helmi stream is a stellar stream
of the Milky Way Galaxy. It started as a dwarf galaxy, now absorbed by the Milky Way as a stream. It was discovered in 1999, is formed of old stars deficient in heavy elements and has a mass of 10 to 100 million solar masses. It was absorbed by the Milky Way some 6 to 9 billion years ago.
, HIP 13044 b
, around the star HIP 13044
.
Stellar stream
This is a list of stellar streams. A stellar stream is an association of stars orbiting a galaxy that was once a globular cluster or dwarf galaxy that has now been torn apart and stretched out along its orbit by tidal forces...
of the Milky Way Galaxy. It started as a dwarf galaxy, now absorbed by the Milky Way as a stream. It was discovered in 1999, is formed of old stars deficient in heavy elements and has a mass of 10 to 100 million solar masses. It was absorbed by the Milky Way some 6 to 9 billion years ago.
Planets of extragalactic origin
The Helmi stream is host to the first discovered planet of extragalactic originExtragalactic planet
An extragalactic planet is a planet that is outside the Milky Way Galaxy. Other terms used to describe these are extragalactic extrasolar planet and extragalactic exoplanet.-Twin Quasar related planet:...
, HIP 13044 b
HIP 13044 b
HIP 13044 b is a Jupiter-like extrasolar planet orbiting the old and metal-poor red giant star HIP 13044, which is situated approximately 2,000 light years away from the Earth in the constellation Fornax. Its discovery was announced on November 18, 2010 after observations using the FEROS...
, around the star HIP 13044
HIP 13044
HIP 13044 is a red horizontal branch star about 2,300 light years away from the Earth in the constellation Fornax. The star is part of the Helmi stream, a former dwarf galaxy that merged with the Milky Way between six and nine billion years ago. As a result, HIP 13044 circles the galactic center...
.
See also
- List of stellar streams