# Thread: A Sort of Problem in Astrophysics

1. Riight - here we go - The Iota System.

Star Iota A - A Type 'T' ( Methane Type ) Brown Dwarf Star
Mass - 28,602 x Earth Mass ( 0.08589 x Solar Mass )
Diameter - 150,000 Km
Average Surface Temperature - 980 degrees Celsius.

Planet "Jinx"
0.9 x Earth Mass

Star Iota B - A Type DO White Dwarf Star
Mass - 170,800 x Earth Mass ( 0.513 x Solar Mass )
Average Surface Temperature - 30,000 degrees Celsius

I have left out a lot of other details of the System, which are not relevant to the problem.

Obviously the Star Iota A will be in orbit around the much more massive Star Iota B.
The Planet "Jinx" is in orbit around the Star Iota A.

Now, this System has been deliberately "engineered" - so that the Planet "Jinx" is always in a direct line between the Star Iota A and the Star Iota B.
This means that at all times, some part of the rotating Planet "Jinx" will be facing towards the Star Iota A - whilst the opposite side will be facing towards the Star Iota B.

I need to find a way to determine where the orbit of "Jinx" lies in orbital distance from Iota A.
Correspondingly - it would be useful to know the length of one "Year" of Jinx in its Orbit.

Secondly - as the actual amount of Radiation from the White Dwarf will be 100 times that of Sol -
What I am proposing is that "Jinx" is habitable - being primarily lit by Iota B, with its "nights" being lit by the duller deep red-violet light of Iota A.
I need to know if this is actually feasible.

2.

3. It seems to me that, unless this star system is totally isolated from the gravity of the rest of the universe, and all the orbits have zero eccentricity, the planet will not be able to stay directly between the two stars without constant intervention from the "engineers".

4. Good point - Yes - it will get eccentric in time.
But we are not gonna worry about what will happen in some 100,000 years time.
We do not know where we will be then - or where the people of "Jinx" will be -
or if there will even BE "People" in this Universe.

But at the moment - the Orbits are almost exactly Circular.
We were not the "engineers" - they left it like this.

5. What being described the situation where "Jinx" is at the L1 point of Iota A and Iota B. The distance from "Jinx" from Iota A can be determined by the equation:

Where:

M1 = mass of Iota B
M2 = mass of Iota A
R = distance between Iota A and Iota B
r = Distance between Iota A and "Jinx"

One thing, L1 is not quite stable. If something were to tug "Jinx" either towards Iota A or Iota B, it would be pulled out of position.

6. Thank You very much -
I will have to determine a reasonable value for r -
Then I will have to do a fair bit of rearranging, to get a Formulae for R.

Thank You - That is Very Helpful.

I may just have to work on the basis - that the Impossible is Possible.

I HAVE stretched a few other things - to get things in the Sci Fi Game to work.

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