Posts by Ynjevi

by Ynjevi
04.07.2005, 19:09
Forum: Celestia Users
Topic: Tempel 1 "wild2like" oportunity?
Replies: 9
Views: 4618

Re: Tempel 1 "wild2like" oportunity?

If I heard and remember correctly, a shape model of the nucleus will be made in a week or so. Don't know if it will become publicly available.
by Ynjevi
04.07.2005, 12:58
Forum: Physics and Astronomy
Topic: Asteroid models from light curves
Replies: 1
Views: 1059

Asteroid models from light curves

Here is couple of interesting websites about determining shapes of asteroids from their lightcurves: New worlds in our solar system Lightcurve observation and analysis The latter site has a lightcurve database, as well as several downloadable shape data files. It's rather cool how accurate asteroid ...
by Ynjevi
04.07.2005, 12:44
Forum: Physics and Astronomy
Topic: Subaru Telescope: "Massive-Core Hot Planet is Discovere
Replies: 13
Views: 3863

Re: Subaru Telescope: "Massive-Core Hot Planet is Discovere

Agreed, rock giant sounds good. Giant planets may all have gaseous envelopes, as it may be unevitable result of higher gravity. What about Gliese 876 d? Should it be called a very small giant or a very large terrestrial planet? It is likely mostly rocky, but has undoubtly a dense atmosphere. What is...
by Ynjevi
16.06.2005, 08:13
Forum: Physics and Astronomy
Topic: exoplanets detection-radial velocity
Replies: 7
Views: 3186

Re: exoplanets detection-radial velocity

how the varation of radial velocity of a star around the barycenter of its system can allow us to have informations about the planet orbiting around this barycenter as well? I am aware than we can deduce from the star orbit the planet orbit, perhaps even the planet mass. However i think that itn be...
by Ynjevi
13.06.2005, 11:56
Forum: Physics and Astronomy
Topic: Mission New Horizons?
Replies: 8
Views: 3279

Re: Mission New Horizons?

The last that I had heard was that they were having problems getting the radioactive material for the mission. There were some issues about production not being able to meet the demand. That was quite some time ago, but it does give the impression that the mission is approved and moving forward. Ye...
by Ynjevi
02.06.2005, 13:10
Forum: Physics and Astronomy
Topic: About antimatter
Replies: 2
Views: 1294

Re: About antimatter

Can antimatter form anti-atoms, like matter can form atoms? So, if antimatter can form not necessarily atoms, but another structure, can it form another Universe, like the atoms do? If it's true, so in this other Universe made with antimatter, life could arose. Can all this be true? I've read somew...
by Ynjevi
04.04.2005, 07:10
Forum: Physics and Astronomy
Topic: First confirmed picture of extrasolar planet
Replies: 9
Views: 2892

Re: First confirmed picture of extrasolar planet

Maybe the "planet" isn't a planet as stated but a brown drawf after all. It could be posible it is a crital mass brown dwarf, meaning that it has enough mass and heat to burn dueterium but not hydrogen. That could help explain its heat output at the suspected distance that it is from its star. If t...
by Ynjevi
25.03.2005, 18:53
Forum: Physics and Astronomy
Topic: Orbiting the Moon
Replies: 4
Views: 1704

Re: Orbiting the Moon

tony873004 wrote:Like Jupiter, Earth and Mars are both known to have trojans that share their solar orbits.


Earth has no known trojans. Trojan asteroids are co-orbital asteroids that are located in L4 or L5 points, nowhere else. But there are some other Earth co-orbitals and quasi-satellites.
by Ynjevi
15.03.2005, 10:12
Forum: Physics and Astronomy
Topic: Spectral colors above class "O"
Replies: 20
Views: 4130

Re: Spectral colors above class "O"

The lower limit for a brown dwarf (ie something that started fusing Deuterium at one point but isn't necessarily anymore) is about 13 Jupiter masses. L dwarfs are the more massive/younger brown dwarfs. They're massive enough to have started fusing deuterium in their cores (about 35-70 Jupiter masse...
by Ynjevi
14.03.2005, 10:41
Forum: Physics and Astronomy
Topic: Spectral colors above class "O"
Replies: 20
Views: 4130

Re: Spectral colors above class "O"

No... The full sequence goes WOBAFGKMRNSLT. W is a Wolf-Rayet Star, much hotter than O, usually a very high mass star with a solar wind so powerful that it's literally blowing itself away. OBAFGKM you know... W is the hottest type, but they are stars that have lost their outer atmosphere. Type O3 s...
by Ynjevi
24.02.2005, 13:54
Forum: Physics and Astronomy
Topic: Dioné et Thétys
Replies: 6
Views: 3833

Re: Dioné et Thétys

I too thought that the moon in background was Tethys. But it is actually Rhea. On February 20th Dione passed over Rhea, and on 21th over Tethys. These images were taken on 20th February. Tethys was the on the other side of Saturn.
by Ynjevi
22.02.2005, 08:32
Forum: Physics and Astronomy
Topic: Sigma1 Taurus
Replies: 16
Views: 6723

Re: Sigma1 Taurus

There are some other good binary candidates out there. One of the top contenders in my book is Eta Cassiopeiae, with a G-type primary and an M-type companion, the orbital range of which leaves plenty of room for a small system, including a habtable world. Actually Achird (Eta Cas) is G+K system, mu...
by Ynjevi
17.02.2005, 12:37
Forum: Physics and Astronomy
Topic: Lots more Titan Imaging on Feb 15
Replies: 11
Views: 2758

Re: New radar images

How does the giant crater frequency at Saturn compare with the situation at Jupiter? From what I've gathered it seems that practically every major moon of Saturn has such a crater, whereas the only giant craters I've heard of in the Jupiter system are Valhalla and Asgard on Callisto. Well, both Io ...
by Ynjevi
10.02.2005, 15:36
Forum: Physics and Astronomy
Topic: Where is Andromeda galaxy now?
Replies: 5
Views: 3274

Re: Where is Andromeda galaxy now?

Pierebean wrote:But I thought that galaxies moved away from each other? I thought that more a galaxy was far, more it moved quickly?


Galaxies belonging to same groups or clusters orbit and collide with each other. Only more distant galaxies recede due to the cosmic expansion, because it is so weak.
by Ynjevi
08.02.2005, 22:49
Forum: Celestia Users
Topic: New exoplanets,but no extrasolar.ssc upates
Replies: 6
Views: 1865

Re: New exoplanets,but no extrasolar.ssc upates

Speaking of new extrasolar planets, it seems the Geneva Group has found six new planets (plus one corfirmation) but Extrasolar Planet Encyclopaedia hasn't yet been updated.
by Ynjevi
06.02.2005, 22:58
Forum: Physics and Astronomy
Topic: Where is Andromeda galaxy now?
Replies: 5
Views: 3274

Re: Where is Andromeda galaxy now?

I have a question. When we look into deep space at the Andromeda galaxy we are looking at it back in time as it was 2 million years ago because of the time it takes for light to reach us. Since that time to the present the Andomeda galaxy has moved a bit through space. It is said M31 is drifting to...
by Ynjevi
26.01.2005, 09:27
Forum: Physics and Astronomy
Topic: NEW Saturn S/2004 S1 S2 S5
Replies: 15
Views: 4313

Re: NEW Saturn S/2004 S1 S2 S5

It's not always clear. Sometimes it's a bit jumbled (eg. Juipter's moons in number order go Io, Europa, Ganymede, Callisto, Amalthea???) It's a little confusing sometimes because it was in order going out from Jupiter and then it goes back in to Amalthea. They are numbered after the date of discove...
by Ynjevi
25.01.2005, 15:52
Forum: Physics and Astronomy
Topic: NEW Saturn S/2004 S1 S2 S5
Replies: 15
Views: 4313

Re: NEW Saturn S/2004 S1 S2 S5

Looks like Cassini has found 2 new satellites, S/2004 S 5 (Polydeuces here) and S/2004 S 6. I found no other information (sizes, orbits etc.) anywhere. Discovery IAUCs (or any other IAUCs) are no longer available to the public. Also it seems that S/2003 S1 has been named as Narvi , S/2004 S 1 is now...
by Ynjevi
22.01.2005, 22:44
Forum: Physics and Astronomy
Topic: some space geography
Replies: 1
Views: 1340

Re: some space geography


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