Which one is earth like planet in Gliese 581?

At first, it was thought to be 581c, but that was discovered to be a little too close. So the attention moved to 581d, which appeared a little too far, but is a possibility if it has a greenhouse effect.

I don't think there are any serious claims that it's "Earthlike", but only that it's in the zone where it may have liquid water. Its mass is more than 5 times Earth's mass.

It's the newest planet discovered in the system, Gliese 581g. However, a few days after they announced the discover of the earth-like planet they announced that it is likely tidally locked. That means that one side of the planet faces the sun at all times, just like our moon with the earth. It also means that it wouldn't really work for humans as a second earth.

The star (Gliese 581)

Mass 0.31M☉; Radius 0.29 R☉; Temperature 3480K; Luminosity 0.013L☉; Metallicity[M/H]= -0.33

The Gliese 581 system of planets :

planet Mass (in terms of Earth masses) a [AU] P (orbital period) days e(Eccentricity)

e 3.1 ≥ m ≥ 1.94 M⊕ . . . . . . . . . . . 0.03. . . . . . 3.14942 ± 0.00045. . 0

b 30.4 ≥ m ≥ 15.65 M⊕. . . . . . . . . . . 0.04. . . . . . . 5.36874 ± 0.00019. . 0

c 10.4 ≥ m ≥ 5.36 M⊕. . . . . . . . . . . 0.07. . . . . . 12.9292 ± 0.0047. . . 0.17 ± 0.07

d 13.8≥ m ≥ 7.09 M⊕. . . . . . . . . . . . 0.22. . . . . . . 66.80 ± 0.14. . . 0.38 ± 0.09

Comments:

1. I don't have ready data on 'g'.

2. With the Star's luminosity at 1/75 th of Sun, to be Earth-like the Star's radiation influx is needed to place the planet at 0.114 AU. So 'd' is the best bet even if it receives 26.86% radiation at that distance, mostly in IR region (N-IR).

3. A mass of between 7.09 to 13.8 Earth masses (a medial 10 times) is still less than the outer pair of Solar system's gas giants (Herschel & Neptune) that keeps its atmosphere in good shape though a wee bit high pressure. It is to be hoped that there'd be some Oxygen like on Earth (at 1/5th).

the section is certainly an prolonged way far flung from earth. whether we use the quickest man made merchandise, Voyager a million, it extremely is going to take 1000's of years to attain there. even if, we nonetheless have one billion years until now Earth is not habitable, so we nonetheless have distinctive time to strengthen the technologies. until now we evacuate to the Gliese device, we would in all probability colonize and terraform Mars first.

Here, read this. It's from the actual team who first presented the results: http://arxiv.org/abs/1009.5733

Click on the link "PDF" to read the article.

Sorry, I've never heard of it.