Posts by Ynjevi

by Ynjevi
12.05.2007, 20:11
Forum: Physics and Astronomy
Topic: First planet detected by COROT
Replies: 2
Views: 3030

Re: First planet detected by COROT

Expect for its apparently huge size, the planet is fairly regular. At this point, the more exciting news is that COROT's photometry is far better than anticipated -- it should be able to spot Earth-size planets around red dwarfs and maybe even around orange dwarfs.
by Ynjevi
03.06.2006, 19:04
Forum: Physics and Astronomy
Topic: Giant 500 Km impact crater found in Antarctica
Replies: 20
Views: 8866

Re: Giant 500 Km impact crater found in Antarctica

The P/T mass extinction event wiped out almost every (but fortunately for us, not all!) mammal-like reptile aka synapsid which were the top land animals at that time. Synapsids managed to regain their status in the early Triassic until they were supplanted by dinosaurs. If I remember correctly, abou...
by Ynjevi
18.05.2006, 17:29
Forum: Physics and Astronomy
Topic: Catalogue of star ages
Replies: 7
Views: 4126

Re: Catalogue of star ages

You might like to check the The Geneva-Copenhagen survey of the Solar neighbourhood catalog, which contains lots of data (including ages) on Sunlike stars in the solar neighborhood.
by Ynjevi
18.05.2006, 17:26
Forum: Physics and Astronomy
Topic: Low mass sextuple systems?
Replies: 8
Views: 4480

Re: Low mass sextuple systems?

According to the RECONS survey, Gliese 644, the 94th closest system to us is a quintuple system, consisting of three red dwarfs and two as of yet unclassified companions. Gliese 570, the 70th system is quatruple (K5+M1+?+T8). There are two other quatruple systems within 10 parsecs.
by Ynjevi
25.03.2006, 19:47
Forum: Physics and Astronomy
Topic: Seriously cool Cassini pic
Replies: 12
Views: 6315

Re: Seriously cool Cassini pic

There's no point to take color images of these events, because Cassini's camera is very slow and the events are really fast. Everything would move between the exposures making the color image construction painful.
by Ynjevi
17.03.2006, 19:10
Forum: Physics and Astronomy
Topic: Angry Scientists Confront NASA Officials at Conference
Replies: 12
Views: 6432

Re: Angry Scientists Confront NASA Officials at Conference

Yeah, the division between pro-space community is especially unfortunate because the real enemy is common to both factions. Human spaceflight is obvious investment for future, but it is pointless without unmanned missions, which in turn provide much better science/money ratio. Main problem (lack of ...
by Ynjevi
04.03.2006, 22:40
Forum: Physics and Astronomy
Topic: Dawn Mission cancelled!
Replies: 8
Views: 4361

Re: Dawn Mission cancelled!

Well, if you think that NASA has too much bureaucracy, compare it to ESA... I've heard that mission approval procedure is much more complicated in ESA, an already accepted mission may be tossed around again... NASA has been more straightforward on this. The success of Mars Express has been important...
by Ynjevi
03.03.2006, 08:04
Forum: Celestia Users
Topic: Why is so hard to find new images of the moon?
Replies: 2
Views: 2031

Re: Why is so hard to find new images of the moon?

I wonder how much images the SMART-1 mission has taken. Judging on the press release rate, that would be a few.
by Ynjevi
03.03.2006, 07:59
Forum: Physics and Astronomy
Topic: Novae vs Type Ia Supernovae
Replies: 4
Views: 3046

Re: Novae vs Type Ia Supernovae

Mass, as usual, determines what happens. Supernova Ia progenitors must lie very close to the maximum white dwarf mass, called Chandrasekhar limit, about 1.4 Solar masses. Only a very few white dwarfs are that massive.
by Ynjevi
03.03.2006, 07:55
Forum: Physics and Astronomy
Topic: Definition of spectral types
Replies: 13
Views: 5866

Re: Definition of spectral types

selden wrote:The spectral classification for our Sun is controversial, for example.


Really?
by Ynjevi
03.03.2006, 07:52
Forum: Physics and Astronomy
Topic: Dawn Mission cancelled!
Replies: 8
Views: 4361

Dawn Mission cancelled!

Yeah, you read it right. There will be no mission to Ceres or Vesta.

:evil:
by Ynjevi
27.02.2006, 09:40
Forum: Physics and Astronomy
Topic: Novae vs Type Ia Supernovae
Replies: 4
Views: 3046

Re: Novae vs Type Ia Supernovae

In the case of novae, only the outer hydrogen layers of the white dwarf start fusion reaction and explode. Type Ia supernovae form when the critical density is reached and fusion reaction starts in the whole star at once.
by Ynjevi
16.02.2006, 19:35
Forum: Physics and Astronomy
Topic: Where to find Super Res Space pics?
Replies: 4
Views: 3451

Re: Where to find Super Res Space pics?

If you want to see really high-res images, I recommend you to visit the Hubble website at http://www.hubblesite.org . There you can find huge high-resolution images well over 10,000 pixels wide. It is likely that your web browser is unable to view them, though.
by Ynjevi
31.01.2006, 10:34
Forum: Physics and Astronomy
Topic: Size of 2003 UB313 confirmed
Replies: 12
Views: 7149

Re: Size of 2003 UB313 confirmed

Yet another similarity with Pluto! :D
by Ynjevi
13.09.2005, 19:11
Forum: Textures
Topic: Preview: Fictional 2K Textures for 4 large KBOs
Replies: 15
Views: 7719

Re: Preview: Fictional 2K Textures for 4 large KBOs

The albedo maps of Charon and Pluto were created by watching the change in light level as Pluto and Charon eclipsed one another as seen from Earth. Most of the others don't have moons, so this technique can't work for them. 2003 EL61 and its moon mutually eclipsed each other in 1999. Next time this...
by Ynjevi
13.09.2005, 18:40
Forum: Physics and Astronomy
Topic: Hayabusa approaches its asteroid!!
Replies: 18
Views: 6101

Re: Hayabusa approaches its asteroid!!

Itokawa is by far the smallest asteroid imaged so far from a close range. It is more like a group of rocks connected with dust resembling pretty much the large boulders seen on Eros.
by Ynjevi
09.09.2005, 08:58
Forum: Physics and Astronomy
Topic: Largest Asteroid May Be 'Mini Planet' with Water Ice =>CE
Replies: 8
Views: 3055

Re: Largest Asteroid May Be 'Mini Planet' with Water Ice =>CE

Malenfant wrote:Isn't there a mission (Dawn?) off to go image them? I know that was being planned at some point, did it ever get off the ground?


It is currently being assembled. The launch is in June, 2006.
by Ynjevi
04.08.2005, 10:01
Forum: Physics and Astronomy
Topic: I Suggest a revised definition of "planet"...
Replies: 100
Views: 27387

Re: I Suggest a revised definition of "planet"...

Like it been has said before, it's time to scrab the old simple major/minor planet system and replace it with more complex taxonomical system. The current system is way too simple; for example, although Pluto is much smaller than Mercury, it is considerably more Mercury-like than Jupiter. The giant ...
by Ynjevi
04.08.2005, 09:34
Forum: Physics and Astronomy
Topic: New batches of Cassini Raw Images of several moons.
Replies: 4
Views: 1772

Re: New batches of Cassini Raw Images of several moons.

Disappear? You can always select a target and choose observation time: newest. But yes, there are many good views in this batch, including the best views of Mimas Cassini can acquire during the whole primary mission. Images showing the crescent Tethys nightside lit with Saturnshine plus two large cr...
by Ynjevi
30.07.2005, 15:21
Forum: Physics and Astronomy
Topic: Here is the "REAL" tenth planet of Solar System
Replies: 46
Views: 12985

Re: Here is the "REAL" tenth planet of Solar System

There is yet another giant Kuiper Belt object announcement. The object, 2005 FY9, is even brighter than 2003 EL61. Not much information is available about it, except the discovery MPEC. It has been detected with Spitzer and seems to be 50%-75% Pluto's size.

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