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John Van Vliet
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Post #221by John Van Vliet » 13.03.2020, 04:42

a Sudarsky Class 4 "hot jupiter"
-- and yes they are blueish

Class4d.png

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jujuapapa
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Post #222by jujuapapa » 13.03.2020, 09:19

John Van Vliet wrote:a Sudarsky Class 4 "hot jupiter"
-- and yes they are blueish
Class4d.png
Hi,

hot jupiter ? are you sure ?
We don't see any moving atmosphere when it's very hot created by the evaporation of clouds.... :eek:

Watch this video which speaks partially about this subject : https://www.youtube.com/watch?time_continue=9&v=XeGFX93CkhY&feature=emb_logo
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Anthony_B_Russo10
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Post #223by Anthony_B_Russo10 » 13.03.2020, 16:02

More, and note the double shadow on the ring set.
gasgiants2.jpg


With a closer look.
ring.png


Added after 1 minute 59 seconds:
gasgiants3.jpg
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Post #224by jujuapapa » 14.03.2020, 06:22

Hi,

Here is a hot jupiter-like with in first characteristic, its synchronus orbit.
hot_jupiter.jpg

You can see the warm side (red ~1,500°K) and the night side (blue with an another point of light, farer (second star))...
Celestia shows us the lighted part of the atmosphere.

Here is only the lighted side.
hot_jupiter2.jpg


I could ameliorate this rendering with a layer of clouds which would turn quickly around the planet... (but it will not visible on a picture) :wink:
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Post #225by Lafuente_Astronomy » 14.03.2020, 09:14

Those look great, jujupapa!
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Post #226by MrSpace43 » 15.03.2020, 22:39

Rendering of Kepler-62f:
Kepler-62f render.png
Hi there! I'm MrSpace43, though I also go by Planetkid32. I've been into Astronomy since I was 5 or 6 and have started making planetary textures back in late 2016. I'm also a 3D animator who makes high quality animations in Cinema 4D. I'm even currently working on a fictional planetary system called the "Onis System."

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Post #227by jujuapapa » 16.03.2020, 07:03

FYI, some datas (from wiki) about kepler-62 :
Kepler-62 is a star somewhat cooler and smaller than the Sun in the constellation Lyra, 1200 light years from Earth.
Spectral Type : K2V
Mass : 0.69 ± 0.02 M☉
Radius : 0.64 ± 0.02 R☉
Luminosity : 0.21 ± 0.02 L☉
Temperature : 4925 ± 70 K
Age : 7 Gyr

It was announced that the star has five planets, two of which, Kepler-62e and Kepler-62f are within the star's habitable zone.

kepler62-comp.jpg

Kepler-67_planets.jpg

:wink:

Question : kepler-62 doesn't exist in standard celestia catalog, who can give the stc file ?

=> I found somes datas in the last stc file of sirius_alpha and datas come from simbad !
spectral type = G5V, distance = 989 LY, ..., they seems better. :smile:
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Post #228by MrSpace43 » 16.03.2020, 18:56

I know that Kepler-62 was a K-type star. I took Kepler-62 from Sirius_Alpha's exoplanet catalog, in which he incorrectly made the star a G-type.
Hi there! I'm MrSpace43, though I also go by Planetkid32. I've been into Astronomy since I was 5 or 6 and have started making planetary textures back in late 2016. I'm also a 3D animator who makes high quality animations in Cinema 4D. I'm even currently working on a fictional planetary system called the "Onis System."

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jujuapapa
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Post #229by jujuapapa » 17.03.2020, 06:49

MrSpace43 wrote:I know that Kepler-62 was a K-type star. I took Kepler-62 from Sirius_Alpha's exoplanet catalog, in which he incorrectly made the star a G-type.
False !

Who are you to say that datas of SIMBAD are not good ? :eek:

kepler-62.jpg

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Post #230by Lafuente_Astronomy » 17.03.2020, 08:41

jujuapapa wrote:Who are you to say that datas of SIMBAD are not good ?

Well, not everything in information is perfect. Things may change as more observations are conducted. I mean, a binary object thought to be within the Andromeda Galaxy was revealed to actually be a pair of supermassive black holes more than a thousand times away. So, perhaps newer info could supersede those in SIMBAD as it is subject to change
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Post #231by MrSpace43 » 17.03.2020, 16:40

jujuapapa wrote:Who are you to say that datas of SIMBAD are not good ?

Geez you don't have to jump out at me like that. Besides, I wasn't even too sure if Kepler-62 was a K2V or a G5V star.
Last edited by MrSpace43 on 17.03.2020, 17:03, edited 1 time in total.
Hi there! I'm MrSpace43, though I also go by Planetkid32. I've been into Astronomy since I was 5 or 6 and have started making planetary textures back in late 2016. I'm also a 3D animator who makes high quality animations in Cinema 4D. I'm even currently working on a fictional planetary system called the "Onis System."

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Post #232by LukeCEL » 17.03.2020, 16:58

jujuapapa wrote:Who are you to say that datas of SIMBAD are not good ?

We had a discussion on Discord about this.

Fafers_br wrote:The discovery paper (https://arxiv.org/abs/1304.7387) explicitly gives spectral class K2V.
In this one (https://arxiv.org/abs/1905.05719) you can see in table 1 the stellar properties from several papers. All of them give Teff that falls in the spectral class K2-3 range.
Gaia photometry also confirm this. It's not the first time I see the spectral class given by 2016A&A...594A..39F (the simbad's source) diverge from the expected class based on Teff.
Not only Teff, but also luminosity, (B-V), etc.

We agreed that the majority of the data seem to show that the spectral type should be K, not G.

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Post #233by SevenSpheres » 17.03.2020, 17:19

Just ignore jujuapapa.
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Post #234by Gurren Lagann » 17.03.2020, 17:30

Barnardrise on Barnard's Star b
Attachments
Barnardrise.png
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Post #235by Sirius_Alpha » 17.03.2020, 20:29

MrSpace43 wrote:I know that Kepler-62 was a K-type star. I took Kepler-62 from Sirius_Alpha's exoplanet catalog, in which he incorrectly made the star a G-type.
LukeCEL wrote:We agreed that the majority of the data seem to show that the spectral type should be K, not G.
Yeah it will be a K-type star in the April release.
Exoplanet nerd. I maintain a monthly-updated exoplanet catalogue here:
https://celestia.space/forum/viewtopic.php?f=23&t=18705

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Post #236by N3cronium » 18.03.2020, 03:00

Moments before impact
impact.png
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Post #237by LukeCEL » 18.03.2020, 03:22

N3cronium, nice! What object is that?

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Post #238by jujuapapa » 18.03.2020, 07:15

SevenSpheres wrote:Just ignore jujuapapa.
@7sphere : I'm always waiting after your apologies ! :eek:
Are you correct in your brain ? :fie:

@lukecell : the first link dated on 2013.
In the second link, I don't see none data... it speaks about only the planet.
kepler-62f.jpg

=> The datas of Simbad (used by the professional astronoms) dates of 2016 as you said.

is someone informations about this star coming from gaia's probe ?
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Post #239by LukeCEL » 18.03.2020, 14:08

jujuapapa wrote:In the second link, I don't see none data... it speaks about only the planet.

You need to click on "PDF only" to see the actual paper. Here's page 3:

kepler62parameters.png

You'll see that Kepler-62's properties (mass, radius, and temperature) look more like that of a K-type star.

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jujuapapa
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Post #240by jujuapapa » 18.03.2020, 16:54

LukeCEL wrote:
jujuapapa wrote:In the second link, I don't see none data... it speaks about only the planet.
You need to click on "PDF only" to see the actual paper. Here's page 3:
kepler62parameters.png
You'll see that Kepler-62's properties (mass, radius, and temperature) look more like that of a K-type star.
TY lukecel. :wink:

In these recent past years, we see that this star was a K-type star.
The last column tell us that it's a G-type star (more 5000°K)
st.jpg
st.jpg (25.49 KiB) Viewed 1346 times

So, we can say that it's a G9-K0 type star, perhaps due to its variability ???

If yes, the life would be few chance to developp itself around one of the twice planets in HZ... :eek:
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