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  #151 (permalink)  
Old 02-November-2007, 08:18 PM
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The image (yuck!) is SpaceRef.com's own graphics and has nothing to do with the original announcement. The news briefing is a teleconference, but the audio will be streamed live nonetheless.
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Old 02-November-2007, 08:31 PM
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It was only a common heliochromological dig from a volunteer heliochromologist.
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Lighten up! This is a stellar board! Author: duh.

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"(sinc)" - spelling is not correct (in its orginal form) :)
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  #153 (permalink)  
Old 02-November-2007, 08:51 PM
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I think it will be some more infos about HD 154345
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  #154 (permalink)  
Old 03-November-2007, 05:00 AM
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"Barnard's Star is "clean" (poor van de Kamp!)"

Well no....it is "Clean" of a high mass planet.

But any planet of 3 Earth masses or less at 1-AU is possible.

So - until we have better instruments one cannot assume Barnard's Star has no planetary companion.

BTW - whats with the 1989-94 "discoveries" (assumed that is what the table above implies). Pretty sure the Pulsar planets were the first ones discovered 95? 96?.
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  #155 (permalink)  
Old 03-November-2007, 01:27 PM
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Quote:
Originally Posted by gaffo View Post
"Barnard's Star is "clean" (poor van de Kamp!)"

Well no....it is "Clean" of a high mass planet.

But any planet of 3 Earth masses or less at 1-AU is possible.

So - until we have better instruments one cannot assume Barnard's Star has no planetary companion.

BTW - whats with the 1989-94 "discoveries" (assumed that is what the table above implies). Pretty sure the Pulsar planets were the first ones discovered 95? 96?.
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  #156 (permalink)  
Old 06-November-2007, 06:51 PM
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family of five planets

http://www.badastronomy.com/bablog/2...planet-system/
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  #157 (permalink)  
Old 06-November-2007, 08:59 PM
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55 Cancri is getting really crowded...
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  #158 (permalink)  
Old 06-November-2007, 09:05 PM
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At the time of the discovery of the fourth planet (that was also big news) the orbits of the two outer ones were believed to be much more eccentric. Now as they've got more data, it appears that all the planets orbit in almost circular orbits (except the new one, but it's within error bars). They're not "decent" gas giants in the sense that they orbit much closer than they should, but still...
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  #159 (permalink)  
Old 06-November-2007, 09:12 PM
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The fifth one was suspected for some time now. I guess this is just the confirmation announcement. There's another five set suspected in another system's dataset, I suppose simply unconfirmed as of yet.
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  #160 (permalink)  
Old 07-November-2007, 10:25 AM
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The discoverers mention in their paper that additional planets of similar or larger mass between the planets f and d can easily avoid detection if they're in resonant orbits.
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  #161 (permalink)  
Old 07-November-2007, 02:23 PM
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There's a pretty impressive gap in the current system layout. It wouldn't overly surprise me to find out there are at least two more planets in there somewhere.
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  #162 (permalink)  
Old 07-November-2007, 07:31 PM
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I had already placed a fictional terrestrial planet (Danzig) in that space for the Orion's Arm scenario, so I've had to make that planet a moon of 55 Cancri f.

Here is the new moon in orbit around the f planet.
http://img127.imageshack.us/img127/2995/danzigiy4.png

A moon in this location could conceivably be habitable, although it would be tidally locked.
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  #163 (permalink)  
Old 07-November-2007, 07:45 PM
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Is there enough there to test Bode's Law?
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  #164 (permalink)  
Old 07-November-2007, 10:54 PM
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Excellent. This is the confirmation Systemic Console is a great program to find additional exoplanets before they're detected and confirmed.

Next: Mu Arae's fifth planet?
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  #165 (permalink)  
Old 08-November-2007, 05:02 PM
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Quote:
Originally Posted by Edasich View Post
Excellent. This is the confirmation Systemic Console is a great program to find additional exoplanets before they're detected and confirmed.

Next: Mu Arae's fifth planet?
Actually, there's another HDXXXXXXX named star with four knowns too. To be honest, I haven't been overly taken with multiplanet systems since the Upsilon Andromedae system was announced.

When they break the eight planet threshold or come up aces with an Earth mass terrestrial (not a pulsar planet ), I don't care where in the system it flies, gimme a call.
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  #166 (permalink)  
Old 08-November-2007, 06:35 PM
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Quote:
Originally Posted by parallaxicality View Post
Is there enough there to test Bode's Law?
Enough where? If you mean among observed exoplanets, no.
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  #167 (permalink)  
Old 08-November-2007, 07:23 PM
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I meant in 55 Cancri but I suppose your answer covers that.
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  #168 (permalink)  
Old 08-November-2007, 08:08 PM
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Quote:
Originally Posted by Doodler View Post
Actually, there's another HDXXXXXXX named star with four knowns too.
You mean HD 160691? That star has a Bayer designation which happens to be Mu Arae.
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  #169 (permalink)  
Old 09-November-2007, 03:43 AM
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Quote:
Originally Posted by Kullat Nunu View Post
You mean HD 160691? That star has a Bayer designation which happens to be Mu Arae.
[edit] Yup, that's the one.
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  #170 (permalink)  
Old 11-November-2007, 12:07 PM
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I've made images of all the (known) planets in the 55 Cancri system now, using Celestia, the Sudarsky classification system and a bit imagination (which in my case is the least reliable part).

Here is the 'f' planet, with an imaginary Earth-like moon; it is a class II planet, with thick water vapour. This is different to the image I posted earlier, which was too blue. I based the earlier image on this picture which is probably much too blue.

Here is the 'e' planet, which is probably hot enough to have clouds of silicate vapour in the atmosphere. I've imagined that such a planet might look a little yellowish- this might not be correct, but the planet's clouds might have all sorts of impurities that give it colour.

Here is the next planet out, 'b', , which is not hot enough to have silicate clouds, but too hot for water clouds (Sudarsky class III). Such a planet would probably be mostly given colour by Rayleigh scattering- the same process which makes our sky blue.

The next planet, 'c', is cool enough for water clouds, (Sudarsky class II) although I've added a lot of blue to the default Celestia texture to suggest that it is quite hot.

The outermost planet known so far, 'd',, is probably a Sudarsky class I planet, like Saturn or Jupiter. Obviously there is a lot of variation within these classes, as Saturn and Jupiter look very different to me, but they both have the distintive yellowish cast of a Class I planet.

Thanks to Grant Hutchinson, who has sorted these planets into classes for Celestia users (although I've adapted the textures somewhat).
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  #171 (permalink)  
Old 12-November-2007, 12:56 PM
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Good job! That's really cool!

No Great Red Spots though!
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  #172 (permalink)  
Old 13-November-2007, 09:29 AM
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New transiting planet:
  • Lupus-TR-3: m = 0.81 MJ, r = 0.89 RJ, a = 0.0464 AU, p = 3.91405 d

It could be a blend by a background eclipsing binary star but that seems unlikely.

The parent star's apparent magnitude is feeble MV = 17.4! That's even less than in the case of the OGLE stars and unfortunate since that makes studying the planet very challenging.
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  #173 (permalink)  
Old 14-November-2007, 05:40 AM
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Default More planet discoveries via microlensing!

A paper just came out yesterday on the astrophysics preprint archive which discusses the past, present, and future of planetary microlensing searches. Here is the title and author: Microlensing Searches for Planets: Results and Future Prospects B. Scott Gaudi Department of Astronomy, The Ohio State University

According to the author, the number of extrasolar planets found via microlensing has been increasing even if the results have not been published, yet. Specifically, he said: "With the recent MOA upgrade, the rate of planet detections has increased substantially. From 2003-2006, six planets were detected (four have been published). From the 2007 bulge season alone, there are four fairly secure planetary events. This rate can be expected to increase modestly as analysis techniques improve, and so the next several years should bring of order a dozen planet detections."

Microlensing searches already strongly suggest that at least a third of the galaxy's single M stars have ~10 Me worlds between 1 and 4 A.U. These new discoveries should help shrink the large error bars associated with this statistic. After decades of ignorance and speculation, we are making great strides toward pinning down the value of Fp in the Drake equation.
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  #174 (permalink)  
Old 26-November-2007, 08:01 PM
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OGLE finds its seventh transiting planet, an inflated one:
  • OGLE-TR-211: P = 3.6772 d, m = 1.03 MJ, r = 1.36 RJ
This means that 50% of transiting planets have been found this year alone (17 of 34). This also proves that the transiting method has matured and one should expect that the number of transiting planets increases rapidly. There is one problem, however: planet candidates must be confirmed using the radial velocity method because brown dwarfs and even smallest red dwarfs are planet-sized. Lack of available follow-up time is a serious hindrance.
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  #175 (permalink)  
Old 02-December-2007, 01:19 PM
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A new planet around Kappa Coronae Borealis b

Quote:
Distance: 31.1 pc
Spectral Type: K1IVa
Mass: 1.8 (± 0.11) Msun
Age: 2.5 (± 1) Gyr
Effective Temperature: 4960 (± 70) K
Radius: 4.71 (± 0.08) Rsun
Metallicity [Fe/H]: 0.14 (± 0.05)
Right Asc. Coord.: 15 51 14
Decl. Coord.: +35 39 27
Habitable Zone: 3.5 AUs

Planet

Mass: 1.8 Jupiter masses
Semi major axis: 2.7 AU
Orbital period: 1191 (± 10) days
Eccentricity: 0.19 (± 0.1)
Omega: 34 (± 40)
Tperi: 2453128 (± 30)
And a possible additional planet in HD 177830 system from Catalog of Nearby Exoplanets:

Planet's parameters are:

HD 177830 c

Period: 111.59 days
Mass: 0.18 Jupiter masses
Eccentricity: 0.27
Average separation: 0.59 AUs

And eccentricity for planet b has been edited with 0.046.
This means: another Hot Neptune.

Moreover this means probable discoveries via Systemic Console may anticipate Exoplanets' detections. Take a look.
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  #176 (permalink)  
Old 10-December-2007, 06:06 AM
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My discovery about planet discovery: JPL Planet Quest: New Worlds Atlas.

Has this been around a while or is it something new? JPL seems to be promoting it as a new multimedia tool.
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  #177 (permalink)  
Old 11-December-2007, 02:21 PM
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The site is old but it was updated recently.
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  #178 (permalink)  
Old 12-December-2007, 07:25 PM
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News from a reliable source: the CoRoT team will publish its first results on December 20.
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Old 12-December-2007, 11:55 PM
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Quote:
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News from a reliable source: the CoRoT team will publish its first results on December 20.
I hope. Rumors was about December 10 and I wait for nothing. Bummer.
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Old 13-December-2007, 03:15 PM
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December 10 date was a misunderstanding. The project had a meeting, but it was not a press meeting.
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