- #1

mahsa

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I know the meaning of trigonometric parallax, but what is angular extent?

In a problem, it is stated that the true angular extent of semi major axis of the orbit is 7.61".

Is it different from parallax?

Thanks

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- Thread starter mahsa
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- #1

mahsa

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I know the meaning of trigonometric parallax, but what is angular extent?

In a problem, it is stated that the true angular extent of semi major axis of the orbit is 7.61".

Is it different from parallax?

Thanks

- #2

zhermes

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The angular extent is simply the angular size---i.e. how big it looks.

- #3

marcus

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the typical application of parallax is where the baseline is provided by OUR orbit around the sun.

I know the meaning of trigonometric parallax, but what is angular extent?

In a problem, it is stated that the true angular extent of semi major axis of the orbit is 7.61".

Is it different from parallax?

Thanks

It sounds to me as if you have a school problem in which there is a binary star or the star has a planet or something orbiting it.

So you are supposed to estimate the real size of a distant object (an orbit) given its angular size seen from earth.

the picture is turned around, the base of the long skinny triangle is out there.

With

That seems like a difference.

- #4

mahsa

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so, if I know the distance to that binary or orbit, I know its linear size.

- #5

marcus

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so, if I know the distance to that binary or orbit, I know its linear size.

Yes!

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