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The star Upsilon Andromedae A has 3 planets and the star 51 Pegasi has one (the first to be discovered orbiting a main sequence star)

Upsilon Andromedae (υ Andromedae / Ups And) is a binary star, approximately 44 light-years away in the constellation Andromeda.

The system contains a yellow-white dwarf star (Upsilon Andromedae A) similar to the Sun and a dim red dwarf (Upsilon Andromedae B). The two stars are separated by around 750 times the distance from the Earth to the Sun.

As of 1999, three extrasolar planets are known in orbit around Upsilon Andromedae A. All three are comparable to Jupiter in mass. Upsilon Andromedae was both the first multiple-planet planetary system to be discovered around a main sequence star, and the first multiple-planet system known in a multiple star system.

Upsilon Andromedae A is ranked 21st in the list of top 100 target stars for the NASA Terrestrial Planet Finder mission.

51 Pegasi is a Sun-like star 15.4 parsecs (50.1 light-years) from Earth in the constellation Pegasus. It was the first Sun-like star to be found to have a planet orbiting it, a discovery that was announced in 1995.

The exoplanet's discovery was announced on October 6, 1995 by Michel Mayor and Didier Queloz. The discovery was made with the radial velocity method at the Observatoire de Haute-Provence.

The star itself is of apparent magnitude 5.49, and so is visible from the Earth with binoculars, or with the naked eye under dark sky conditions. 51 Pegasi is a yellow dwarf star estimated to be 7.5 billion years old, somewhat older than the Sun, 4-6% more massive, with more metal content and running low in hydrogen. Its spectral type is listed as either G2.5V or G4-5Va.

The planet has been informally nicknamed Bellerophon. After its discovery, many teams confirmed its existence and obtained more observations of its properties, including the fact that it orbits very close to the star, suffers estimated temperatures around 1200 Celsius, and has a minimum mass about half that of Jupiter. At the time, this close distance was not compatible with theories of planet formation and resulted in discussions of planetary migration.

2007-02-21 11:03:41 · answer #1 · answered by Anonymous · 1 0

Astronomers now see a planet around another star for the first time. But that is a rare case. Most times, only the effect of a planet's motion around a star is seen. This is the Doppler shift of the emission lines from the star. Right now, there is almost no possibility to see a planet directly. It is like trying to see a moth next to a searchlight, and you are miles away from both. We may be able to detect if a star in the Andromeda galaxy has a planet by similar methods in the future, but that will take new equipment. However, there will be a three million year delay between what happens on a planet in Andromeda galaxy and what you see.

2016-05-24 04:18:39 · answer #2 · answered by Anonymous · 0 0

I'm sure the Andromeda Galaxy has many solar systems just as our Milky Way galaxy does.

2007-02-21 11:22:01 · answer #3 · answered by Tikimaskedman 7 · 0 0

If you're referring to the galaxies in (and therefore named after) these constellations, then the answer is that no one knows for sure. However, since we have detected other solar systems in our own galaxy, it would be safe to assume they also exist in other galaxies.

2007-02-21 09:35:12 · answer #4 · answered by davidbgreensmith 4 · 0 0

No, you have named constellations, not stars.

Oh, and only our sun has a "solar" system, since the word refers to "Sol," our star. Other systems would be more correctly referred to as planetary systems.

2007-02-21 09:32:31 · answer #5 · answered by Anonymous · 0 0

andromida is a hugh galixy and yes it has solar systems galixies are made of stars with planets and moons all their own and they also have their own circles of life to.

2007-02-25 04:51:43 · answer #6 · answered by Tony N 3 · 0 0

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