The question doesn't specify the time when the 'bright planet' was observed. That makes a difference ... every object in the sky rises in the east and sets in the west once a day, and may be seen in a whole range of different directions at different times of night.
We can probably assume that the author of the question made his observation at some time in the early evening; most casual sky-gazers do their gazing between sunset and normal bed-time.
These days, the planet Jupiter is rising just about the same time as the sun is setting, at a point on the horizon that is just south of due east.
Venus
Venus
In July, 2009, a bright object low in the southeast sky after sunset is probably the planet Jupiter.
Venus. This planet is visible just prior to sunrise and just after sunset depending on the time of year, and is the brightest natural light in the sky.
As of October 2009, Jupiter is very bright and visible from sunset until about 1AM.
At the moment (beginning of December 2008), the bright planets to be seen in the evening sky are Venus and Jupiter, the two are in conjunction (close together) in the sky at the moment.
Probably Jupiter which rises about 9 PM, depending on where in your time zone you are.
venus
sometimes you can see the planet venus!
Venus
Venus
A very bright star. If you have a telescope, you can tell that it's a planet by it's colour, brightness and size.
We can usually distinguish them. If it's twinkling then its a star. If it's not twinkling then it's a planet, unless it's a star that's very high in the sky.
In July, 2009, a bright object low in the southeast sky after sunset is probably the planet Jupiter.
Venus is the brightest star. It is also the hottest planet it reflects a lot of light from the sun and we can see it as a bright dot in the sky.
Venus. This planet is visible just prior to sunrise and just after sunset depending on the time of year, and is the brightest natural light in the sky.
As of late 2011, it's the planet Jupiter.