Orodruin said:You don't, not unless you know the shape of the object. An arcsecond is an angle and a steradian is a solid angle, they are different things. It is like asking how to convert a length into an area.
Since you are working with arcsecs, I assume we're discussing very small angles. If the subtended angle (of a diameter) is theta and the distance from the observer is R, what, roughly, is the visible area? Divide that by R2 and you have the steradians.Teenion said:I know its spherical object (I should have mentioned it in my first post)..
Yeah, converting is not a good word for what I want to do.. Better question would be How can I obtain the size of the spherical object in steradians if I know the angular size in arcsecs.
An arcsec, or arcsecond, is a unit of measurement used in astronomy to measure angles. It is equal to 1/3600th of a degree.
A steradian is a unit of measurement used in physics to measure solid angles. It is defined as the solid angle subtended at the center of a sphere by an area on the surface of the sphere equal to the square of the sphere's radius.
The conversion factor for arcsec to steradians is 4.25x10^-4.
To convert arcsec to steradians, simply multiply the number of arcsec by the conversion factor of 4.25x10^-4.
Yes, you can use a calculator to convert arcsec to steradians. Simply enter the number of arcsec and multiply it by 4.25x10^-4 to get the equivalent value in steradians.