Wednesday, February 21, 2007

Dwarf Planets at AAAS


As of this week, Technorati ranks this blog at number 99,790. In a universe of 60 million blogs, that is pretty good. Thank you Cuddihy, Swinesworld, Samwise, Curmudgeons Corner and many others too numerous to mention.

Sunday morning in the Hilton Franciscan Room D Vivien White talked about project ASTRO, an initiative to provide astronomers for K-12 classrooms. Saturday afternoon in Continental Ballroom 3 astronomer Michael Brown talked about minor planets. He is known for discovery of 2003 UB313, the largest known dwarf planet. Originally he wanted to name it Xena, and its satellite Gabrielle. Finally the IAU settled on the name Eris for UB313 and Dysnomia for its satellite. Eris is goddess of discord and Dysnomia of lawlessness. As we all know, Lucy Lawless played Xena!

Object 2003 EL61 orbits at a 30-degree inclination to the solar system, spinning end over end like an American football. It also has a moon, which has allowed astronomers to calculate its mass. These objects were located by an automated telescope atop Mount Palomar, and noticed by an automated system searching thousands of images. The sky is a big place--at this scale Earth's orbit would be inside the yellow dot!

Eris is approximately 2400 km in diameter. Her orbit is inclined 45 degrees to the solar system plane, a fact which astronomers are at a loss to explain. If these dwarf planets formed around singularities, they could have any inclination. Orbits of these tiny Black Holes initially surrounded the Sun like an electron cloud. Even a 500 km moon like Enceladus may contain a singularity. Our galaxy may still be surrounded by a Black Hole cloud, leading to signs of dark mass.

4 Comments:

Blogger Zia Rezvi said...

Say, I like your site!

2:27 AM  
Blogger mark said...

the astronauts for primary school is a great idea.--astronomy is a natural gateway to the sciences, don't you think?

4:08 AM  
Blogger L. Riofrio said...

Welcome zxia, mark. Astronomy is indeed a natural gateway. Even mathematicans like Peter Woit admit to being inspired by the stars. There is a scene in ASTRONAUT FARMER where Billy Bob appears in full spacesuit before an appreciative classroom. It would be great to get astronauts appearing K-12 schools.

8:23 AM  
Anonymous Sam said...

Good to hear that your message is getting out there with the help of the ol' blogocube.

My blog ranks 559,650, but to be quite honest I don't really care.

10:21 AM  

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