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Posted: 13.03.2020, 04:42
by John Van Vliet
a Sudarsky Class 4 "hot jupiter"
-- and yes they are blueish
Posted: 13.03.2020, 09:19
by jujuapapa
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....
![Surprised :eek:](./images/smilies/smile_bigeek.gif)
Watch this video which speaks partially about this subject :
https://www.youtube.com/watch?time_continue=9&v=XeGFX93CkhY&feature=emb_logo
Posted: 13.03.2020, 16:02
by Anthony_B_Russo10
More, and note the double shadow on the ring set.
With a closer look.
Added after 1 minute 59 seconds:
Posted: 14.03.2020, 06:22
by jujuapapa
Hi,
Here is a hot jupiter-like with in first characteristic, its synchronus orbit.
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.
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 :wink:](./images/smilies/smile_wink.gif)
Posted: 14.03.2020, 09:14
by Lafuente_Astronomy
Those look great, jujupapa!
Posted: 15.03.2020, 22:39
by MrSpace43
Posted: 16.03.2020, 07:03
by jujuapapa
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.
![Wink :wink:](./images/smilies/smile_wink.gif)
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 :smile:](./images/smilies/smile_real.gif)
Posted: 16.03.2020, 18:56
by MrSpace43
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.
Posted: 17.03.2020, 06:49
by jujuapapa
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 ?
![Hi! :hi:](./images/smilies/smile_hand.gif)
Posted: 17.03.2020, 08:41
by Lafuente_Astronomy
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
Posted: 17.03.2020, 16:40
by MrSpace43
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.
Posted: 17.03.2020, 16:58
by LukeCEL
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.
Posted: 17.03.2020, 17:19
by SevenSpheres
Just ignore jujuapapa.
Posted: 17.03.2020, 17:30
by Gurren Lagann
Barnardrise on Barnard's Star b
Posted: 17.03.2020, 20:29
by Sirius_Alpha
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.
Posted: 18.03.2020, 03:00
by N3cronium
Posted: 18.03.2020, 03:22
by LukeCEL
N3cronium, nice! What object is that?
Posted: 18.03.2020, 07:15
by jujuapapa
SevenSpheres wrote:Just ignore jujuapapa.
@7sphere : I'm always waiting after your apologies !
![Surprised :eek:](./images/smilies/smile_bigeek.gif)
Are you correct in your brain ?
@lukecell : the first link dated on
2013.
In the second link, I don't see none data... it speaks about only the planet.
=> 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 ?
Posted: 18.03.2020, 14:08
by LukeCEL
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:
You'll see that Kepler-62's properties (mass, radius, and temperature) look more like that of a K-type star.
Posted: 18.03.2020, 16:54
by jujuapapa
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.
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](./download/file.php?id=7429&filename=st.jpg)
- st.jpg (25.49 KiB) Viewed 9338 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...
![Surprised :eek:](./images/smilies/smile_bigeek.gif)