Yantas - A Pretty Amateur WIP

[sangi39]

Still working on the precipitation jazz (taking longer than I thought because I can never settle on how specific to be with regards to regions, and then work interrupts my thinking about it ), so I thought I'd post a few simple things while I'm not too busy doing much else. First, here's an image of Yantas from a number of different angles, including the poles:



Next up is a random bunch of astronomical data which has pretty much nothing to do with Yantas itself (except for where it does), but it could affect astronomical details in later stages:


Italva (parent star)

Mass: 1.065 solar masses (G1 star)
Diameter: 1.033 solar diameters
Luminosity: 1.165 xSol
Apparent Luminosity: 1.008 times that of the Sun as seen from Earth
Effective Temperature: 5950.965K
Angular Size: 30.611 minutes (0.961 times that of the Sun as seen from Earth).



Velas (rocky)

Mass: 5.584 x 10[super]23[/super] (about 7.6 times that of the Moon)
Diameter: 5838km
Density: 5.36 g/cm[super]3[/super]

Semi-Major Axis: 30,500,000km
Orbital Period: 32.5 (Earth) days

Eccentricity: 0.17
Node: -0.000365°

Inclination: 2.12°



Severa (rocky)

Mass: 1.954 x 10[super]23[/super] (about 2.66 times that of the Moon)
Diameter: 4102km
Density: 5.41 g/cm[super]3[/super]

Semi-Major Axis: 52,900,000km
Orbital Period: 74.5 (Earth) days

Eccentricity: 0.15
Node: -19.1°

Inclination: 3.71°



Piranka (rocky)

Mass: 2.389 x 10[super]24[/super] (about 0.4 times that of the Earth)
Diameter: 10559km
Density: 3.92 g/cm[super]3[/super]

Semi-Major Axis: 86,400,000km
Orbital Period: 155.0 (Earth) days

Eccentricity: 0.069
Node: 40.2°

Inclination: 4.24°

(The general plan is to have a single moon for Piranka, but the exact details of this are yet to be decided.)



Yantas (rocky)

Mass: 5.972 x 10[super]24[/super] (about the same as the Earth's)
Diameter: 12760km
Density: 5.49 g/cm[super]3[/super]

Semi-Major Axis: 1.08AU
Orbital Period: 1.08 (Earth) years
Sidereal Day: ~24hrs 40mins (1.019 times that of Earth), making Yantas' year 386.925 Y-days long.

Eccentricity: 0.024
Node: -61.4°

Inclination: 3.77°


Yantas has two moons, Hwestun and Kadyura


Kadyura

Mass: 0.3 lunar masses
Diameter: 2326km
Angular Size: 36.381 minutes (1.170 times the apparent size of Earth's Moon as we see it, and 1.188 times that of Italva)

Semi-Major Axis: 219,788km
Orbital Period: 11.56 Y-days (11.8 Earth days)
Phase Cycle: 11.916 Y-days, (32.471 phases per year)

Eccentricity: 0.013
Node: -40.3°

Inclination: 4.39°


Hwestun

Mass: 0.8 lunar masses
Diameter: 3226km
Angular Size: 21.549 minutes (0.694 times the apparent size of Earth's Moon as we see it, and 0.704 times that of Italva)

Semi-Major Axis: 514,656km
Orbital Period: 41.511 Y-days (42.3 Earth days)
Phase Cycle: 46.5 Y-days, (8.321 phases per year)

Eccentricity: 0.11
Node: 25.6°

Inclination: 1.97°


(Kadyura thus goes through 3.902 phases for every one phase Hwestun goes through.)
(I might change some of these details if the tides become too extreme. Kadyura causes tides 1.602 times the values of those caused by our Moon while Hwestun's are just 0.334 the Moon's. How those interact with each other, however, I don't know )



Gunyari (rocky)

Mass: 1.433 x 10[super]24[/super] (about 0.24 times that of the Earth)
Diameter: 8209km
Density: 4.95 g/cm[super]3[/super]

Semi-Major Axis: 1.78AU
Orbital Period: 2.3 (Earth) years

Eccentricity: 0.047
Node: -150°

Inclination: 6.35°



Asteroid Belt

The asteroid belt lies roughly 3.14AU out from Italva.



Baridan (Gaseous)

Mass: 1.519 x 10[super]27[/super] (about 0.8 times that of Jupiter)
Diameter: 120812km
Density: 1.64 g/cm[super]3[/super]

Semi-Major Axis: 5.38AU
Orbital Period: 12.1 (Earth) years

Eccentricity: 0.064
Node: 44.5°

Inclination: 3.59°



Akyeru (Gaseous)

Mass: 2.297 x 10[super]27[/super] (about 1.21 times that of Jupiter)
Diameter: 148125km
Density: 1.35 g/cm[super]3[/super]

Semi-Major Axis: 9.33AU
Orbital Period: 27.6 (Earth) years

Eccentricity: 0.16
Node: 44.5°

Inclination: 14.8°



There's also Rembika, Oligaris and Loki, all of which are gaseous, but I haven't worked out the more detailed stuff for them yet

According to Universe Sandbox, the orbits appear to be stable, so for the moment I'm sticking with them.

[Jalyha]

something's off just around your equator, I think... but I can't figure out what, it just feels off... it should be *hotter* on the land about the equator... not cooler... right? Maybe it's something easily fixed when adding in precipitation?

I've been using a different method, so I'm not sure :/

Also... The lines/transitions seem too smooth somehow ... (worse to the edges of the map, in any direction, so might be details you've not added yet?)


I wish I could be more help, but I'm new to this and don't want to say something wrong when it's not cause I did mine different methods!

[sangi39]

something's off just around your equator, I think... but I can't figure out what, it just feels off... it should be *hotter* on the land about the equator... not cooler... right? Maybe it's something easily fixed when adding in precipitation?

These two maps of Earth in July and Januray respectively, seem to suggest otherwise. From what I've been advised in various places on the net, land heats up and cools down faster than ocean, meaning that temperatures in the oceans remain roughly similar throughout the year at a given latitude but vary more widely on Earth.

The average temperature map on the same map shows that the average annual temperature at the equator is roughly the same on both land and ocean. Some areas along the equator reach their peak high temperatures in April and September

Also... The lines/transitions seem too smooth somehow ... (worse to the edges of the map, in any direction, so might be details you've not added yet?)

Yeah, this map is, at the moment, incomplete, hence the lack of detail in the western and eastern portions of the map and towards the north and south as well, I was just wondering if I wasn't heading in the wrong direction

I wish I could be more help, but I'm new to this and don't want to say something wrong when it's not cause I did mine different methods!

Yeah, I have the same general "policy". I'll happily provide resources and point to various helpful parts of the internet, but I'm always hesitant to actually provide solid, personal advice just in case I haven't understood something correctly

[Jalyha]

Actually, you're right... I was also thinking that was your Summer map, for some reason.

I'm gonna go take my foot out of my mouth now...




EDIT: Also your continents are a lot more earth-like than mine, which could be why I'm seeing things ^.^

[sangi39]

Ok, so I've been working on a basic pressure map this morning/early afternoon and this is where I've got to so far for Yantas in July (northern summer, southern winter):



And for Yantas in January (northern winter, southern summer)



Now, I've followed the climate cookbook as best I can, but I get the feeling I've gone wrong in a number of places through lack of understanding. For example, I'm not too sure whether I've got the centres of those pressure zones, e.g. over the oceans and lands, correct or whether I've got the mergers of pressure zones quite right.

Hope someone might be able to help out

[Raptori]

I *think* it's more or less correct, but the bands of H and L markings make it a bit hard to read. It'd be more legible to me if you just placed a single H and a single L in the centre of each area where the pressure should be at it's strongest either way, and then from that it's easy to draw the contour lines.

However, I'm by no means an expert on this, so it'd be worth it to wait for someone who knows what they're talking about.

[sangi39]

I *think* it's more or less correct, but the bands of H and L markings make it a bit hard to read. It'd be more legible to me if you just placed a single H and a single L in the centre of each area where the pressure should be at it's strongest either way, and then from that it's easy to draw the contour lines.

However, I'm by no means an expert on this, so it'd be worth it to wait for someone who knows what they're talking about.

All updated for you

[Raptori]

Haha much better, thanks!

Okay so here goes:

July
I think they might be the wrong way around - but I might have this backward lol. Northern hemisphere should have high pressure, and low pressure over water. Southern hemisphere should have those the other way around. So the lows on the equator look correct, but then the northern hemisphere ones I think are the opposite to what it should be. The west of the southern hemisphere looks correct, but then over the landmass on the center/east there should be low pressure.

January
I think here the band across the northern tropic looks right, with the esception of the two high pressure areas over the continents which should instead be low pressure areas. The equator should still be high pressure over land and low over water, so that's mostly correct, and the band across the southern tropic looks the opposite of what it should be.

The way I did it on my map was basically split each map into two by covering half and only working on one hemisphere at a time. If that hemisphere is in summer, I first put H marks in the center of any large area of land, and then put L marks in the center of any large oceans. If that hemisphere is in winter, I'd do the opposite - put L marks on the land, then H marks on the water. In fact, I might be reading your map wrong and switching the land and water, in which case my advice above would be completely hopeless

[sangi39]

Haha much better, thanks!

Okay so here goes:

July
I think they might be the wrong way around - but I might have this backward lol. Northern hemisphere should have high pressure, and low pressure over water. Southern hemisphere should have those the other way around. So the lows on the equator look correct, but then the northern hemisphere ones I think are the opposite to what it should be. The west of the southern hemisphere looks correct, but then over the landmass on the center/east there should be low pressure.

January
I think here the band across the northern tropic looks right, with the esception of the two high pressure areas over the continents which should instead be low pressure areas. The equator should still be high pressure over land and low over water, so that's mostly correct, and the band across the southern tropic looks the opposite of what it should be.

The way I did it on my map was basically split each map into two by covering half and only working on one hemisphere at a time. If that hemisphere is in summer, I first put H marks in the center of any large area of land, and then put L marks in the center of any large oceans. If that hemisphere is in winter, I'd do the opposite - put L marks on the land, then H marks on the water. In fact, I might be reading your map wrong and switching the land and water, in which case my advice above would be completely hopeless

I was following these two tips from the Climate Cookbook:

while in summer the land warms to create a low-pressure area, which joins up with the ITCZ and the PF, leaving high-pressure areas over the oceans

In winter, the cooling of the land creates a high-pressure area over the interior, which merges with the high pressure area around the STHZ and leaves low-pressure systems over the oceans

So that the northern hemisphere in July should have low pressure over the land and high pressure over the ocean and then, in January, high pressure over the land and low pressure over the ocean. The opposite would then be the case for the southern hemisphere.

I'm looking to see if your advice might be used in reverse to see if my maps make sense

[Raptori]

Ahhhh yes! I had it mixed up - for some reason I was thinking rising air = high pressure when actually it's the opposite. Sorry about that!

In that case then I think it's all correct.

Did the Climate Cookbook say what should happen in the tropics in summer? I can't remember whether I had a band of high pressure over both air and land like that, I'll have to go check the files I made again...