A new planetDecember 17th, 2009 by Andrew
It’s strange that I go on holiday and promptly fail to have enough time to do anything, but there you go. Haven’t posted in weeks.
So, moving on, today’s (yesterdays?) news. A research team in the US has identified a planet orbiting the red dwarf GJ 1214. What makes this particularly interesting – by comparison to the long line of extrasolar planets discovered in the past ten years – is two things:
- Its characteristics. It’s quite small – six and a half earth masses, and about twice the diameter – but it’s also quite light. This indicates an unusual composition; it’s probably composed of ice and a small core, with a thick atmosphere, rather than rock. It’s hot, though – not as hot as Venus, but certainly hotter than we’d like – and so that ice is probably in some exotic form.
- …and the way it was discovered. This wasn’t identified as the result of a high-powered orbital mission, or of extensive searching on one of the major telescopes; it was a small group of researchers, cherry-picking likely targets, for a total cost probably under half a million dollars. We can hope to see quite a few more…
We’re about four centuries – give or take three weeks – from Galileo discovering the first icy worlds, little satellites in orbit around Jupiter. This new object – a super-Ganymede as much as a super-Earth – seems a pretty triumphant discovery to mark the anniversary.