by harry » Wed Dec 28, 2005 10:25 pm
Your right some parts are closer than 1500 light years as the APOD states.
"The region around Alnitak is remarkable as well, containing several dusty clouds of interstellar gas, including the famed "Horsehead Nebula" to the south. Alnitak approaches first magnitude even though at a distance of 800 light years."
and
BETELGEUSE (Alpha Orionis). " At its most likely distance of 425 light years, its measured angular diameter yields a radius 600 times that of the Sun, 2.8 Astronomical Units. If placed at the Sun, the star would go 55% of the way to the orbit of the planet Jupiter. From its size and temperature, allowing for its infrared radiation,"
and
RIGEL (Beta Orionis). "At a distance of 775 light years, Rigel actually shines with the light of 40,000 Suns. It is a "blue supergiant," a fairly hot star with a surface temperature (11,000 Kelvin) about double that of our Sun. "
and
CURSA (Beta Eridani). "Only 89 light years away, Cursa shines with a soft white light from a surface with a temperature of 8360 Kelvin. A giant star of class A about three times the solar diameter, it radiates 45 solar luminosities into space. Containing two to 2.5 times the mass of the Sun."
and so on
Happy New Year
Your right some parts are closer than 1500 light years as the APOD states.
"The region around Alnitak is remarkable as well, containing several dusty clouds of interstellar gas, including the famed "Horsehead Nebula" to the south. Alnitak approaches first magnitude even though at a distance of 800 light years."
and
BETELGEUSE (Alpha Orionis). " At its most likely distance of 425 light years, its measured angular diameter yields a radius 600 times that of the Sun, 2.8 Astronomical Units. If placed at the Sun, the star would go 55% of the way to the orbit of the planet Jupiter. From its size and temperature, allowing for its infrared radiation,"
and
RIGEL (Beta Orionis). "At a distance of 775 light years, Rigel actually shines with the light of 40,000 Suns. It is a "blue supergiant," a fairly hot star with a surface temperature (11,000 Kelvin) about double that of our Sun. "
and
CURSA (Beta Eridani). "Only 89 light years away, Cursa shines with a soft white light from a surface with a temperature of 8360 Kelvin. A giant star of class A about three times the solar diameter, it radiates 45 solar luminosities into space. Containing two to 2.5 times the mass of the Sun."
and so on
Happy New Year