Gliese 581g - Page 2 - Orbiter-Forum

**Izack** · 09-30-2010, 06:55 PM

Quote:

Originally Posted by RisingFury

Ouch...

Wow, I didn't even notice that at first. It looks like a paraphrased quote, so I suppose the writer of the article got it wrong. Or Mr. Vogt isn't who he says he is.

T.Neo · 09-30-2010, 06:56 PM

I hope that is a really, really bad typo, and not a really, really, really, really, really bad statement from the astronomer himself.

Jarvitä · 09-30-2010, 07:20 PM

Quote:

Originally Posted by RisingFury

Ouch...

What? He only missed by a dozen orders of magnitude. A common mistake in pseudo-astronomy.

**tblaxland** · 10-01-2010, 01:31 AM

Quote:

Originally Posted by Mindblast

How can they determine it is tidally locked by just looking at the wobbles of the star ?

By prediction. It would need to be an unusually homogeneous rocky body to be not tidally locked at that distance from the parent star after 7 or so billion years.

**Orbinaut Pete** · 10-01-2010, 05:16 PM

Keck Observatory discovers the first Goldilocks exoplanet.

Astronomy Now: "Goldilocks exoworld discovered".

Discovery News: "Earth-Like Planet Discovery Buoys Search for Life".

BBC News: "'Goldilocks planet just right for life'".

SPACE.com: "A Million Questions About Habitable Planet Gliese 581g (Okay, 12)".

Sky Captain · 10-01-2010, 07:23 PM

I'm wondering how large telescope would be needed to directly image that planet to get spectroscopical data from atmosphere?

RisingFury · 10-01-2010, 08:51 PM

Quote:

Originally Posted by Sky Captain

I'm wondering how large telescope would be needed to directly image that planet to get spectroscopical data from atmosphere?

One trick is to measure the spectrum of the system and then again when the planet is behind the star. That way you get a spectrum of star + planet and star, you subtract them and you get the spectrum of the planet. If the alignment is right and if you're clever enough, it works

Sky Captain · 10-01-2010, 08:58 PM

IMHO it would be highly unlikely that orbital plane of any random planet would be aligned perfectly edge on toward us.

T.Neo · 10-01-2010, 09:58 PM

Yeah... the planets in the Gliese 581 g system don't transit the star, unfortunately, so the transit method is completely useless here.

**Cairan** · 10-01-2010, 11:30 PM

Even though they do not transit, they do exhibit phases toward Earth. It should be theoretically possible, over the course of several observations spanning several orbital cycles, to measure the components of Gliese 581 and it's planets which should vary over time in respect to the phases they exhibit toward us even if they don't transit...

**Hielor** · 10-02-2010, 12:21 AM

Looks like it's been named Zarmina: http://io9.com/5653433/the-astrophys...n-second-earth

Spike Spiegel · 10-02-2010, 03:15 AM

I realize that we've only got our own solar system's worlds as really good examples, and many of the larger bodies have atmospheres, but does a large world necessarily have to have an atmosphere? Is it possible that a large "Earth-sized" world might be just barren, with no atmosphere at all, even in the star's habitable zone?

donatelo200 · 10-02-2010, 03:21 AM

Quote:

Originally Posted by Spike Spiegel

I realize that we've only got our own solar system's worlds as really good examples, and many of the larger bodies have atmospheres, but does a large world necessarily have to have an atmosphere? Is it possible that a large "Earth-sized" world might be just barren, with no atmosphere at all, even in the star's habitable zone?

Yes but planets of that size normally will accumulate an atmosphere during accreation and/or from techtonic activities.

**Cairan** · 10-02-2010, 03:41 AM

So, Donatelo200, any project to upgrade with G581 g and f?

I don't know if it's an error, but I have seen that the Wikipedia article on Gliese 581 now shows all planets with 0 eccentricity, which is quite different from the previous model. I guess that Gliese 581 g/f being discovered "cleaned up" the orbital dynamics quite a bit...

donatelo200 · 10-02-2010, 03:50 AM

Yea i will be updating everything in the system. I'm even retexturing planet b c and d. The new planets discovered had proved the old model wrong. And speeking of g and f here are some screenes of g.

The day side of Gliese 581 g.

The night-side of Gliese 581 g.

I have Gliese 581 g with an atmosphere 5 times the thickness as ours and strong vortexes in the upper atmosphere keeping both sides of the planet at relativly the same tempurature.

10-01-2010, 05:16 PM	#20
Orbinaut Pete ISSU Project Manager	Keck Observatory discovers the first Goldilocks exoplanet. Astronomy Now: "Goldilocks exoworld discovered". Discovery News: "Earth-Like Planet Discovery Buoys Search for Life". BBC News: "'Goldilocks planet just right for life'". SPACE.com: "A Million Questions About Habitable Planet Gliese 581g (Okay, 12)". Last edited by Orbinaut Pete; 10-01-2010 at 11:18 PM.

10-02-2010, 03:50 AM	#30
donatelo200 High School Freshman	Yea i will be updating everything in the system. I'm even retexturing planet b c and d. The new planets discovered had proved the old model wrong. And speeking of g and f here are some screenes of g. The day side of Gliese 581 g. The night-side of Gliese 581 g. I have Gliese 581 g with an atmosphere 5 times the thickness as ours and strong vortexes in the upper atmosphere keeping both sides of the planet at relativly the same tempurature. Last edited by donatelo200; 10-02-2010 at 04:03 AM.

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09-30-2010, 06:55 PM	#16
Izack Non sequitur	Quote: Originally Posted by RisingFury Ouch... Wow, I didn't even notice that at first. It looks like a paraphrased quote, so I suppose the writer of the article got it wrong. Or Mr. Vogt isn't who he says he is.

09-30-2010, 06:56 PM	#17
T.Neo SA 2010 Soccermaniac	I hope that is a really, really bad typo, and not a really, really, really, really, really bad statement from the astronomer himself.

09-30-2010, 07:20 PM	#18
Jarvitä Orbinaut	Quote: Originally Posted by RisingFury Ouch... What? He only missed by a dozen orders of magnitude. A common mistake in pseudo-astronomy.

10-01-2010, 01:31 AM	#19
tblaxland Webmaster	Quote: Originally Posted by Mindblast How can they determine it is tidally locked by just looking at the wobbles of the star ? By prediction. It would need to be an unusually homogeneous rocky body to be not tidally locked at that distance from the parent star after 7 or so billion years.

10-01-2010, 07:23 PM	#21
Sky Captain Orbinaut	I'm wondering how large telescope would be needed to directly image that planet to get spectroscopical data from atmosphere?

10-01-2010, 08:51 PM	#22
RisingFury OBSP developer	Quote: Originally Posted by Sky Captain I'm wondering how large telescope would be needed to directly image that planet to get spectroscopical data from atmosphere? One trick is to measure the spectrum of the system and then again when the planet is behind the star. That way you get a spectrum of star + planet and star, you subtract them and you get the spectrum of the planet. If the alignment is right and if you're clever enough, it works

10-01-2010, 08:58 PM	#23
Sky Captain Orbinaut	IMHO it would be highly unlikely that orbital plane of any random planet would be aligned perfectly edge on toward us.

10-01-2010, 09:58 PM	#24
T.Neo SA 2010 Soccermaniac	Yeah... the planets in the Gliese 581 g system don't transit the star, unfortunately, so the transit method is completely useless here.

10-01-2010, 11:30 PM	#25
Cairan Donator	Even though they do not transit, they do exhibit phases toward Earth. It should be theoretically possible, over the course of several observations spanning several orbital cycles, to measure the components of Gliese 581 and it's planets which should vary over time in respect to the phases they exhibit toward us even if they don't transit...

10-02-2010, 12:21 AM	#26
Hielor Defender of Truth	Looks like it's been named Zarmina: http://io9.com/5653433/the-astrophys...n-second-earth

10-02-2010, 03:15 AM	#27
Spike Spiegel Orbinaut	I realize that we've only got our own solar system's worlds as really good examples, and many of the larger bodies have atmospheres, but does a large world necessarily have to have an atmosphere? Is it possible that a large "Earth-sized" world might be just barren, with no atmosphere at all, even in the star's habitable zone?

10-02-2010, 03:21 AM	#28
donatelo200 High School Freshman	Quote: Originally Posted by Spike Spiegel I realize that we've only got our own solar system's worlds as really good examples, and many of the larger bodies have atmospheres, but does a large world necessarily have to have an atmosphere? Is it possible that a large "Earth-sized" world might be just barren, with no atmosphere at all, even in the star's habitable zone? Yes but planets of that size normally will accumulate an atmosphere during accreation and/or from techtonic activities.

10-02-2010, 03:41 AM	#29
Cairan Donator	So, Donatelo200, any project to upgrade with G581 g and f? I don't know if it's an error, but I have seen that the Wikipedia article on Gliese 581 now shows all planets with 0 eccentricity, which is quite different from the previous model. I guess that Gliese 581 g/f being discovered "cleaned up" the orbital dynamics quite a bit...