Another low-eccentricity HZ gas giant

[ajtribick]

HD 99109 b appears to be a low-eccentricity planet in its star's habitable zone. Maybe prospects for habitable moons, though with a mass less than Jupiter this may not be a realistic prospect.

Other planets recently announced:
HD 164922 b
HD 66428 b
HD 107148 b
HIP 14810 b

[Saturn1970]

These are great news . I like HD 164922 b. It has a similar mass of Saturn (~0.30) and is 2.11 AUs from is parent star. The star is a a KV0 star type less bright than our sun. This means that the HD 164922 b planet is located in a zone (in terms of temp) aprox to Jupiter in our solar sytem. I am wonder if HD 164922 b as rings. this could be the most saturn look-like exoplanet found. Any ideas or opinions?

[DonAVP]

Just a thought. When I first started using Celestia I downloaded a script on Saturn. One thing that struck me and I did not know was the amount of H2O that the planet has. Like, as I recall it has something like 90% of all the know H2O in out system. Don't know if this is the cause for the rings but if the H2O can be determined on the new planet it may have rings.

Don

[ajtribick]

Let's just throw in a second planet around HIP 14810

And two unconfirmed planets with large semimajor axes: HD 24040 (8.32 AU), HD 14345 (9.21 AU)

[chris]

Thanks to Grant, the planets HD 164922 b , HD 66428 b, HD 99109 b , HD 107148 b and HIP 14810 b are now included in the version of extrasolar.ssc in CVS. Here's the download link if you don't want to wait for the next prerelease:

http://celestia.cvs.sourceforge.net/*ch ... ision=1.71

--Chris

[granthutchison]

And here are the Celestia elements for Hip 14810 c, news of which came in just a tad too late for the update I sent Chris. It'll go in the next update.

Code: Select all

"c" "HIP 14810"
{
   Texture "exo-class2.*"

   Color  [0.98 0.97 1]
   Albedo 0.75

   Mass       300     # M.sin(i) = 0.951 jupiters
   Radius     70000
   Oblateness 0.06

   InfoURL "http://exoplanet.eu/planet.php?p1=HIP+14810&p2=c"

   EllipticalOrbit {
      Period          0.3116
      SemiMajorAxis   0.458
      Eccentricity    0.2806
      ArgOfPericenter 140
      MeanAnomaly     266
   }

   RotationPeriod  10 # plausible guess
}

AltSurface "limit of knowledge" "HIP 14810/c"
{
   Texture "extrasolar-lok.*"
}

Grant

[Saturn1970]

Let's just throw in a second planet around HIP 14810

And two unconfirmed planets with large semimajor axes: HD 24040 (8.32 AU), HD 14345 (9.21 AU)

Great. Nice semimajor axes, but the mass for these worlds is huge. I think jovian planets located in the outer zones of planetary systems are more common than we expect.

[ajtribick]

Grant, thanks for adding the planets, and the HIP 14810 c data.

Saturn1970 - huge masses? Come on, HD 14345 "b" is a mere 2 Jupiter masses... fairly small compared to some of the worlds out there.

[Saturn1970]

Grant, thanks for adding the planets, and the HIP 14810 c data.

Saturn1970 - huge masses? Come on, HD 14345 "b" is a mere 2 Jupiter masses... fairly small compared to some of the worlds out there.

I guess your right. I am just compared them with the jovians we have in our own solar system.