Ultimate space simulation software

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by An'shur
12 Nov 2018 11:24
Forum: Feedback and Suggestions
Topic: Luminosity of supergiant stars
Replies: 2
Views: 103

Luminosity of supergiant stars

I know that the magnitude scale is inverted, smaller the number, the brighter the object. When I throw these examples of luminosity (4475, 3549, 2409) from my screenshots into this calculator  it gives me these magnitudes: -4.39, -4.135, -3.715. None of these are yellow supergiants, the least lumino...
by An'shur
10 Nov 2018 00:51
Forum: Feedback and Suggestions
Topic: Luminosity of supergiant stars
Replies: 2
Views: 103

Luminosity of supergiant stars

I am not sure where would it be appropriate to post it, so here it goes. I have version 0.980E. So the thing is, that luminosity of procedural supergiants does not correlate with this graph. https://upload.wikimedia.org/wikipedia/commons/6/6b/HRDiagram.png In other words, I think that luminosity/abs...
by An'shur
08 Nov 2018 16:00
Forum: Space Journeys
Topic: Strange sightings
Replies: 140
Views: 23749

Strange sightings

https://i.imgur.com/jVY3RsI.jpg This here is the second ever binary stellar remnant I have found so far. It is a neutron star and an accreting white dwarf. I assume that binary dead stars are rare in SE, and I would be interested in seeing or finding other multiple combinations of WDs. Qs an Xs. (R...
by An'shur
08 Nov 2018 15:54
Forum: Space Journeys
Topic: Planets with potentially breathable atmospheres
Replies: 320
Views: 40543

Planets with potentially breathable atmospheres

https://i.imgur.com/VeautfS.jpg https://i.imgur.com/G8lCuPZ.jpg Almost breathable. SO 2  seems to be tolerable, but the hydrogen sulfide would stink. The party pooper here is CO 2 , and the temperature of course. https://i.imgur.com/rBxHedo.jpg This one is not breathable, but it is a curious find. ...
by An'shur
08 Nov 2018 15:42
Forum: Space Journeys
Topic: Image Dump
Replies: 1974
Views: 208888

Image Dump

https://i.imgur.com/twgzFyV.jpg I've been exploring the Messier 71 cluster in the Sagitta constellation. https://i.imgur.com/csmXaWE.jpg From Earth. See the Coathanger, on the right. https://i.imgur.com/ljA8RFb.jpg Red hypergiant transited by a parent planet of a moon. (RSC 8474-314-0-0-16)...
by An'shur
08 Nov 2018 07:06
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1174
Views: 114793

Science and Astronomy Questions

24125 Under a truly dark sky and without Venus or the Moon in the sky to provide illumination, the ground looks black, like absolutely black.  You can't even see your hand in front of your face. I dare to disagree. :) I remember participating on a Messier marathon* once and seeing the meadow and th...
by An'shur
06 Nov 2018 10:47
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 266
Views: 30511

Astrophotography

Not only is the Moon illuminated from way too south, which would never happen, it is also about 6 times bigger than the Pleiades in the lower left corner. Angular diameter of the Moon is less than that of the Pleiades. It is also way too far from the ecliptic.

Just something that itched my eyes.
by An'shur
04 Nov 2018 08:37
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1174
Views: 114793

Science and Astronomy Questions

Watsisname wrote:
Qr Bbpost the apparent magnitude of the Moon becomes about magnitude +10.8

Not good. :) Thanks for the calculation.
by An'shur
04 Nov 2018 05:06
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1174
Views: 114793

Science and Astronomy Questions

24108 If the atmosphere of Venus was completely cloud-free, would we even be able to see anything from the surface, like Sun, planets, and stars? This is a very interesting question! I assume you mean if the atmosphere was STILL CO 2 rich and capping at a pressure of 93 bar , with its characteristi...
by An'shur
04 Nov 2018 01:38
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1174
Views: 114793

Science and Astronomy Questions

24083 Temperature and Pressure are interrelated aspects here, at least inversely. Doubling the atmospheric pressure will double the scattering of light, whereas doubling the temperature doubles the brightness (reducing scattering), as an example. On Venus, we can see this happening vividly, where t...
by An'shur
03 Nov 2018 04:26
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1174
Views: 114793

Science and Astronomy Questions

24083 You mentioned sulfur, and this is a good example for the scattering in action. At 1 atm pressure, blue light is cut to below human eye visibility in less than half a meter, and the red is gone in fifty meters. Hence planets with a predominantly sulfuric atmosphere would have a dim murky yello...
by An'shur
03 Nov 2018 01:53
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1174
Views: 114793

Science and Astronomy Questions

That was an enlightening analysis. :) To divert the discussion, I have two sets of questions. One about the color of planetary atmospheres and one about eclipses, but they are related. My assumption is, that the color of an atmosphere is determined by it's composition, density and non-gaseous additi...
by An'shur
01 Nov 2018 04:12
Forum: Space Journeys
Topic: The "That Totally Looks Like _____" Thread
Replies: 89
Views: 16497

The "That Totally Looks Like _____" Thread

Hello America.

Image

► Show Spoiler
by An'shur
01 Nov 2018 03:23
Forum: Feedback and Suggestions
Topic: General suggestions for SpaceEngine
Replies: 1010
Views: 125556

General suggestions for SpaceEngine

I would very much like to see variable stars. Periodic  change of their radius and temperature (therefore, luminosity) might be a good start. (Which would require periodic change of corona radius, surface features and many other parameters, when I think about it). Different kinds of variable stars l...
by An'shur
25 Oct 2018 09:25
Forum: General Discussions
Topic: Unexpected (emergent?) discoveries in SE?
Replies: 11
Views: 1296

Unexpected (emergent?) discoveries in SE?

Neptune-sized moons before the first candidate (Kepler-1625b I).
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