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  #21  
Old 27-04-2007, 12:06 AM
casstony
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Quote:
Originally Posted by bojan View Post
We would be 2.22 times heavier on that planet...
Olympic sports would really not be very exciting on that planet. Brassiere manufacturers would do very well.
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  #22  
Old 27-04-2007, 12:10 AM
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Quote:
Originally Posted by [1ponders] View Post
If it has oceans, imagine the tides it must get with a 15 earth mass planet between it and it's sun. With this planet only having a 13 day year there would be hardly spittin' distance between it and the 15 masser...

...If there is life there it may only be able to survive near the twilight zones.
Imagine that, Neptune 'like' planet in the sky without the need to peer thru a scope and Marron season only days away, again! All those suns out there and only us? I think not.
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  #23  
Old 27-04-2007, 08:13 AM
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Quote:
Originally Posted by casstony View Post
Olympic sports would really not be very exciting on that planet. Brassiere manufacturers would do very well.
Swimming would be quite comfortable, though.. preferred way of life on that planet
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  #24  
Old 27-04-2007, 09:42 AM
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Quote:
Originally Posted by okiscopey View Post
Hmmm. Looks like this variable isn't very variable. This paper reports that Gl 581 varies by less than '6mmag'.

Anyone have any idea what a 'mmag' is? Is it a millimagnitude?!?
6mmag variability could be caused by the (at least) two transiting planets perhaps?
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  #25  
Old 27-04-2007, 02:09 PM
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Somebody should try imaging the star and see if you get a moving planet after like 2 days.

Would it be possible?
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  #26  
Old 29-04-2007, 08:36 AM
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With a half magnitude of variability and the risk of flares from the star, I don't think Goldilocks or anyone else from Earth would find it a very comfortable place to live... maybe in a cave for protection!

cheers, Gordon
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  #27  
Old 29-04-2007, 10:07 AM
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Gliese 581 and Celestia

I was playing with input of known orbital elements into Celestia...
This is what the planet system should look like from 1.1 AU distance (FOV is 30 degrees) :-)
And the second image is component B transit viewed from the vicinity of component C.

I included the modified file with companion definitions (the original from Celestia website still does not contain components C and D), it should be unzipped on drive C (the unzipped files should be placed in \Celestia\extras\NearbyStars subdirectory)

It is not known if inclination of any of those planets is small enough to enable transits... the values used here are defaults
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Last edited by bojan; 29-04-2007 at 12:22 PM. Reason: typos
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  #28  
Old 01-05-2007, 01:16 PM
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Does anyone know the SAO or HD catalog #, for Gliese 581 ?
I am trying to find it in Cartes Du Ciel, I am sure i will be asked to point it out at the next observing night !
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  #29  
Old 01-05-2007, 01:52 PM
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from Wikipedia:

It is about two degrees north of Beta Librae, the brightest star in the constellation Libra.

and

The name Gliese 581 refers to the Star catalogue of nearby stars by Wilhelm Gliese. Other names of this star include BD-07° 4003 (BD catalogue, first known publication) and HO Librae (variable star designation).

cheers, Gordon
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  #30  
Old 01-05-2007, 01:54 PM
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Thanks Gordon, I was also looking in Wikapedia & found that Info.
Unfortunatly those catalogs are not in my Cartes Du Ceil library.
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  #31  
Old 01-05-2007, 02:08 PM
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I assume it is also known as:

Hipparchos #74995
TYC 5594 1093 1
2UCAC29110263

but the HO Lib position in Guide does not correspond to these, in fact there is no star there at all, the above being about 70" away, but variable star positions are often wrong, so I'm pretty sure the above is it. Surely you must have one of those catalogues?

cheers, Gordon
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  #32  
Old 01-05-2007, 07:08 PM
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Quote:
Originally Posted by gaa_ian View Post
Thanks Gordon, I was also looking in Wikapedia & found that Info.
Unfortunatly those catalogs are not in my Cartes Du Ceil library.
Gliese catalog is available at the website
http://www.stargazing.net/astropc/external.html

or direct link:
http://astrosurf.com/astropc/cartes/prog/gliese.zip

And, the star is right here.....
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  #33  
Old 01-05-2007, 10:27 PM
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Thanks Bojan !
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  #34  
Old 01-05-2007, 10:50 PM
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not until we find a planet with such a spectrum, then we have good reason to celebrate :
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  #35  
Old 02-05-2007, 05:46 PM
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today's APOD shows us
a picture postcard from the surface of gliese 581 c

http://antwrp.gsfc.nasa.gov/apod/ap070502.html
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  #36  
Old 02-05-2007, 05:51 PM
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Quote:
Originally Posted by ispom View Post
today's APOD shows us
a picture postcard from the surface of gliese 581 c
It's beautiful. Let's go there!

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  #37  
Old 02-05-2007, 06:03 PM
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Map

Below is a map showing Gliese 581 in a yellow square.
It is 1d 46m from bet Lib in pa 20 and transits about 1:30 am here.
The map and the following data are from SkyMapPro.

Visual magnitude: 10.57
Spectral type: M5
Distance: 20.4 +/- 0.3 light years
Luminosity: 0.0019 +/- 0.00005 x Sun's luminosity

Hipparcos number: HIP 74995
Hipparcos Catalog Data
Equatorial coordinates (epoch J2000.0, ICRS)
RA: 15h 19m 26.8251s
Dec: -7° 43' 20.208"

Main Mission Variability
Observed magnitude at maximum and minimum luminosities:
Mag at max, Hp: 10.49 (5th percentile)
Mag at min, Hp: 10.60 (95th percentile)
Type of variability: the entry could not be classified as variable or constant with any degree of certainty (eg due to the presence of one or more outliers in the epoch photometry).
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  #38  
Old 02-05-2007, 08:40 PM
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Quote:
Originally Posted by okiscopey View Post
It's beautiful. Let's go there!

Damn! Torvell and Dean beat us! (click this link to see what the hell I am talking about)
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  #39  
Old 02-05-2007, 09:27 PM
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We couldn't go there. Human diseases and bacteria would destroy any life form there.
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  #40  
Old 02-05-2007, 10:16 PM
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You never know Ingo, the life forms there might have us for Sunday roast.
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