Sedna

[Yesspaz]

So, Avian. What's the deal with Sedna?

[Avian(Admin)]

"Sedna" (an unofficial name) is the largest object found so far outside Pluto. It's location is about 13 billion (thousand million for you Brits) kilometers away. This puts it outside the Kuiper Belt, a collection of icy rocks that goes out to around 50 AU or so. But it's also inside the inner boundary of the Oort Cloud, a theoretical sphere home to trillions of cometary bodies that's supposed to extend about halfway to the next star. Sedna has a huge, ellipical orbit around the sun. It's distance to the sun ranges from 11 billion km to 150 billion km. It takes 12,000 years to orbit the sun!

It's very large. They don't know the exact size yet, but it's smaller than Pluto - about half the size of our moon - somewhere between 1,200 to 1,700 km (Pluto is about 2400 km).

It's the largest object discovered since Pluto, which was discovered by Clyde Tombaugh in 1930.

It was discovered by a team looking for large objects in the outer part of the solar system. They are the same team that discovered "Quaoar" a few years ago (1,300 km across, and much closer).

Is it a planet? That topic is sure to be debated! Many scientists are holding Pluto as the standard minimum size for a planet - anything under would be a minor planet. But that's certainly arbitrary. The search continues!

Avian

[moses]

How many other stations give you science lessons along with your prog rock?

[Avian(Admin)]

I forgot to mention that an AU is an Astronomical Unit, based on the average distance between the Sun and Earth - about 150 million kilometers (93 million miles).

Avian

[Rick and Roll]

Sedna was a Swedish prog band.

Or "Andes" spelled backwards?

[Avian(Admin)]

I guess Sedna is an Inuit goddess that lives under the ice or something - probably got the name from the same source!

If I discover a minor planet, I'm going to name it Mel.

Avian

[Extended Play]

Originally posted by Avian
I guess Sedna is an Inuit goddess that lives under the ice or something - probably got the name from the same source!

If I discover a minor planet, I'm going to name it Mel.

Avian

I always thought Bob would be a great name for some non-descript ice ball hurtling through space, but what do I know?

Hey, are we still playing StarDate or am I just not listening to the station enough?

Tommy

[ivan_2068]

Sedna has a huge, ellipical orbit around the sun. It's distance to the sun ranges from 11 billion km to 150 billion km. It takes 12,000 years to orbit the sun!

I don't care what scientists believe, it's an object with an independant orbit around the sun (doesn't orbit around other object so it's not a satelite), it's not an asteroid, so despite the size it's a planet, a very small one but still a planet.

Iván

[Yesspaz]

Haley's Comet orbits the sun, as does Hale-Bopp (or whatever it's called) - not planets...

Sedna is the Inuit goddess of the oceans but it seems strange that they chose this name rather than another Roman or Greek diety. I would have liked them to use the name Bacchus (Roman god of wine and drinking) but then again I would!!!!

If I discover a minor planet I'd call it Eric. Well we have Eric the fish (he is an 'allibut), Eric the cat and Eric the half a bee so why not Eric the minor planet?

[Rick and Roll]

Eric the Fruit Bat!

[Extended Play]

An Halibut!


I've always been partial to Bob. It's a palindrome, and as such it's always fun to say! (plus, full of lucrative markting ideas as Bob, the littlest planet)

Originally posted by Extended Play
It's a palindrome, and as such it's always fun to say!

You want a palindrome? I'll point you to a palindrome!!!!!

Is this fun to say?

http://www.neuralintegrator.com/palindrome

[Rick and Roll]

loves palindromes. He checked out a book once with short ones, but have funny pictures.

This one, while not repeating, is very non-sensical. Therefore, is it really useable?

It is funny, though!

And he spelled repetitive wrong in the introduction!

Am I taking this too seriously?

Only on AM can we go from celestial bodies to palindromes (although there are some celestial bodies that would be fun to go forwards and backward on) says he in his best Groucho Marx voice.

[Avian(Admin)]

There are many small bodies orbiting the sun - trillions of asteroid and comets. Some are big (many miles across), some small. None of them are considered planets, however.

Sedna is the suggested name. The IAU may indeed make teh name official in a future meeting. Many of the Roman and Greek names are already assigned. Plus, I think the IAU wants to be inclusive of more cultures in future naming of major bodies.

Naming guide:

Minor asteroids are named by usually honoring people, places, things and events. There are many living people who have an asteroid named after them by the IAU.

Major Asteroids (minor planets) have mythological names, as do planets and their major moons.

Comets are named after their discoverer(s). Hale-Bopp is Alan Hale and Tom Bopp, the latter of whom I just spent some time with, as he was just in town staying with my boss. Great guy. You'll also see comet names (like the ones coming up this spring) named after the research project that discovered them.

All of these objects also have catalog have less exciting catalog designations as well (e.g. 422).

[Rick and Roll]

Originally posted by Avian
Hale-Bopp is Alan Hale

The guy from Gilligan's Island?

[Extended Play]

Whoa there little buddy!

[Yesspaz]

Originally posted by Keith Waye


You want a palindrome? I'll point you to a palindrome!!!!!

Is this fun to say?

http://www.neuralintegrator.com/palindrome

Tommy Shaw to that guy: "You've got too much (clap clap) time on your hands and it's ticking away with your sanity."

[ivan_2068]

Haley's Comet orbits the sun, as does Hale-Bopp (or whatever it's called) - not planets...

Well Yesspaz, the orbit of a comet is absolutely different to the orbit of a planet, it's not heliocentic because it crosses the orbits of other planets, the orbit of a planet is almost perfectly heliocentric and independant to other plamets, unless something really catastrophic happens).

Of course the comets have other features that planets don't have like tail, nucleus, coma, etc.

Iván

[Rick and Roll]

I'm a meat and potatoes guy, and I know only a little about this, but I do know Ivan's a lawyer and Yesspaz is an accomplished debater, so this is fun......

Maybe Avian can be the moderator.....