Celestia Forums

This adds the recently discovered ultra-short period Hot Jupiter NGTS-10b and its host star.
The Zip file is fixed now, hopel=fully for the final time.

The system doesn't display even when declared in the config file of the macOS version.

Anthony_B_Russo10 wrote:NOTE: Only the star works under 1.6.2 beta 1 & 2, 1.6.1, and 1.6.0. And the System doesn't work in general under the macOS of 1.6.1 even when declared in the config file.

This is because you have a comma in the planet's radius: Radius 84,242.755‬. It should be: Radius 84242.755‬. I have no idea why it doesn't work on a Mac.

Edit: I see you've fixed it.

Edit2: No wait, there's another bug: the planet is inside the star.

The planet is fixed for Windows.

You can use a RotationPeriod of 414.96 (17.290 days), from the discovery paper.

Also, when you use inclination / ascending node values from the literature, they have to be put through Grant Hutchinson's star orbit spreadsheet to generate the correct orientations for Celestia.

Transiting planets like NGTS-10b give you an easy way to check whether or not you've got the orbits correct. Remember, the given orbital elements are usually relative to the sky plane, while Celestia's default is to use orbital elements relative to the ecliptic.

In Celestia, go to the solar system, then centre the host star. Once it's centred, go to the star then mouse-wheel out to a few hundred AU and zoom in so the disc of the star is visible. Turn on orbit rendering. The orbit should pass in front of the star. If it does not, you've got the orbit wrong.

Next check is to set the time to the transit time listed in the orbital elements. At this point, the planet should be in front of the star. If it does not, you've got the orbital phase wrong. Admittedly the distance uncertainty to the system combined with the effects of light travel time makes this somewhat less important than the first check. On the other hand Celestia does not take the time delay into account while rendering, so the usual convention employed in the extrasolar planets file is to treat the time delay to the system as zero.

Once you've got the transiting planets right (and try some eccentric planets like, say, HD 80606 b to really be sure), you will have more confidence that you're getting non-transiters right.