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Exoplanetary Scratchpad

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Chalawan (aka 47 Ursae Majoris) is solar analog (G1 V, about the same age as the Sun) with 3 planets 46 ly away. One of earliest systems discovered. Taphao Thong (b, 2.5 MJ, 2.1 AU) and Taphao Kaew (c, 0.5 MJ, 3.6 AU) are in circular orbits at asteroid-belt like distances, while planet d (1.6 MJ, 11.6 AU) is in a distant more eccentric orbit (0.16, 9.6-13 AU). Planet b was the first found to have a circular orbit beyond the habitable zone. The discovery of planet c made the system the first multiplanet system whose planets have circular orbits, and b and c are rough Jupiter-Saturn analogs in relative size and positions. Their existence was in doubt until planet d was discovered. Planet d has not yet completed a full year (38.4 years) yet since its discovery (it cannot be named yet), but is the furthest out planet discovered with the dopplar spectrometry method. Studies have shown a terrestrial planet could only form in the innermost part of the habitable zone. Several transmissions have been sent to the star system. One of the first 20 exoplanet systems allowed to be given common names by the IAU. Star named after a Thai crocodile asterism and its planets are associated with two sisters associated with this legend. Taphao Thong was captured by the crocodile, while her sister Taphao Kaew married the one who rescued her.

My Thoughts[]

A real blast from the past this one is. A nice little Jupiter/Saturn analog and a good solar analog too. They say there could be a habitable planet in there somewhere, but I kinda doubt it. It'll be a looong wait for planet d to get confirmed. I wonder if they'll discover another planet in the meantime and call that one d instead?


Bear constellation, discovered by Americans. - GHAZALA - after old arabian name for constellation - Chalawan - after a Thai crocodile asterism

47 Ursae Majoris System Web Pages[]

Extrasolar Visions Threads[]

47 Ursae Majoris System in the News[]

Cold Jovian Planet Discovered (1996)[]

Second Planet Detected (2001)[]

Doritos Ad to be Sent to 47 Ursae Majoris (2007)[]

Planets Confirmed, Third Detected (2010)[]

One of the Top 20 Exoplanetary Systems First Up For Naming (May 2015)[]


See Also[]