I was looking around to see what we know about exosolar planets (of which 208 seem to be confirmed at this point) to see what is the smallest most Earth-like one detected.

I happened to spot OGLE-05-390Lb in the database. It is about 5 Earth masses, and orbits a 0.22 Solar Mass red dwarf at about 2AU. It has an orbital period of almost 10 years.

On this chart, that put it near the bottom of the possible trough of ground-based microlensing detections. Note that in our solar system, only Jupiter and Saturn would have been detected by this technique. It is also interesting that while Earth might get detected by SIM, only the Kepler mission could detect Venus, and nothing in our current plans comes close to detecting Mercury.

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Forming opinions as we speak

Wow, that's a slow one. Barely another .7ish AU out further than Mars with another 8 years of orbital period...

How fortuitous of them. Not only was the mass barely enough, but the stated period of 10 years put it at the very limit. [From my crude measurement, it is just outside the limit if 10 years were to be taken as exact.]

Here is an image and light curve. The light curve shows the anomaly which is the evidence for the planet. I had never seen one. It is interesting and amazing to see such harvesting techniques!

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Lighten up! This is a stellar board! Author: duh.

"The Sun, with all the planets revolving around it, and depending on it, can still ripen a bunch of grapes as though it had nothing else in the universe to do..." Author: Galileo supposedly.

The lower solar mass implies lower orbital speed at the same distance, I believe.

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"I come from London, a small village on Mars just outside the capital Wibble."
Captain Edmund Blackadder

Valid point, I didn't catch the star mass info at first glance.