- #1

- 2

- 0

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

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter mahsa
- Start date

- #1

- 2

- 0

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

- 1,254

- 3

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

- #3

marcus

Science Advisor

Gold Member

Dearly Missed

- 24,738

- 788

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

- 2

- 0

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

- #5

marcus

Science Advisor

Gold Member

Dearly Missed

- 24,738

- 788

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

Yes!

Share: