Talk:Isogen-5

According to the article, "Isogen-5 is an exceedingly rare, extremely unstable variant of isogen found only in blue bright star (Type O1) systems."

I've looked also at the Chronicle: World on Fire and so I'm assuming that this bit of information comes from the chronicle which states:

""Every affected system had a Type-O star," the scientist stated. "And it appears that every single one of them had an identical event."

President Foiritan was beside himself. "‘Identical'? Where else is the loss of life so high—"

"Seyllin was the only world with a notable population," the advisor muttered. "Blue-star systems tend to be devoid of surface life, it's just too—""

However, Seyllin (and every system with Shattered Planets) actually has an A0 Blue Star. Thus both this page and the chronicle are inaccurate. --Faulx 12.22.2011

---

Okay, so looking through the chronicle again, I noticed the quote

""This is no ordinary flare," the CONCORD representative stated. "That much material bring thrown off is characteristic of a supernova, only there isn't enough of it to suggest that a total collapse is imminent. But the ejected plasma is following this new magnetic field at incredible sublight speeds.""

And It occurred to me that perhaps the star has switched from O1 to A0 as a result of the ejected mass; however, I've done some looking up on the expected masses for O1 and A0 stars. Mintaka (O1-3III), one of 3 stars making up the left most point of Orion's Belt, for example is 20 solar masses. Meanwhile, Rigel A and B, two stars composing the point of light at the south east corner of Orion, are both B9 (one step above A0) stars and have 2.5 and 1.9 solar masses. So for these O1 stars to become A0 stars they would have had to drop around 90% of their mass during the Seyllin Incident. If this were the case, the sudden drop in gravity combined with the outward pressure of the solar winds/photon pressure of the event would have thrown every orbital body in system (especially the shattered planet which, assumedly, was struck with a bolt of plasma comprising 90% of the suns' mass) outward into space. Clearly this has not been the case as planets, moons, belts and stargates. are all still there years later.

Now there is just one other bit from the chronicle that seems relevant

"Theirs would be the irony of being trapped in the dark, when somewhere above them the hottest sun in the cosmos was hurling radioactive fire upon them."

Since O1 stars are definitely the "hottest stars", I'd like to modify by my earlier conclusion that these references to O1 stars are mistakes by saying,... Either the references to O1 stars in the chronicle are mistakes or all the shattered planet stars need to be retconned to O1 stars (or near O1.. something with enough mass to continue to hold the local solar system together). It would probably be easier to change the ficton of course. Although the "show info" window on most stars in the game are also showing incorrect information, so an in game fix is needed anyway. Though if you're considering that option, I'm sure Arek'Jaalan would NOT like the stars to be made into anything other than O1's since Project Tesseract is already well underway. -- Faulx 0740 12.26.2011

Keep in mind that all of these stars underwent massive disasters that included ejection of a significant amount of mass; that's why the planets are shattered, after all. What would happen to a star's spectral class after such an event is likely to be drastic. --ISD Caleb Kang 17

22, 26 December 2011 (UTC)

True enough, but going from O1 to A0 would drop the mass by a factor of at least 8. This would result in all the stable orbits changing to spiral orbits and the planets and stargates slowly flying off into space. --Faulx 1901 12.26.2011

Oh, trust me, I know. But even so, it'd probably take a long time for the planets and gates to be flung out of their orbits. --ISD Caleb Kang 0055, 27 December 2011 (UTC)

<rant> "But even so, it'd probably take a long time"... Why speak in the hypothetical? Using acceleration=G*newSunMass/(distanceToSun^2), where newSunMass = 2.0*1.9891e30 (i.e. 2.0 solar masses, down from the original 18.892916 solar masses of a O1 star), assuming the drop in mass to be instantaneous, also assuming fully circular orbits (and most of the planets in seyllin are close), ignoring the effects of solar winds and radiation pressure and the inertial transfer of the bolt of plasma that hit Seyllin I (which would all act to increase the rate at which the planets fly away), and applying Euler's method with a deltaT = 0.1 seconds over a period of (seyllin event = yc 111.03.10, to [semi]current date = 113.12.27) diff = 1,022.75 days = 88,365,600 seconds.... we have...

//seyllin I

initialDistance = 0.558 AU, orbitPeriod = 35 days

orbitVelocityO1 = 310,830.67 m/s, escapeVelocityA0 = 79,751.50 m/s

currentDistance = 91.3292110782 AU

//seyllin II

initialDistance = 0.870 AU, orbitPeriod = 68 days

orbitVelocityO1 = 139,188.15 m/s, escapeVelocityA0 = 63,869.92 m/s

currentDistance = 73.5210088705 AU

//seyllin III

initialDistance = 1.108 AU, orbitPeriod = 98 days

orbitVelocityO1 = 123,000.14 m/s, escapeVelocityA0 = 56,596.05 m/s

currentDistance = 65.0605305435 AU

//seyllin IV

initialDistance = 1.773 AU, orbitPeriod = 198 days

orbitVelocityO1 = 97,417.16 m/s, escapeVelocityA0 = 44,740.58 m/s

currentDistance = 51.8526587591 AU

//seyllin V

initialDistance = 2.438 AU, orbitPeriod = 320 days

orbitVelocityO1 = 82,884.94 m/s, escapeVelocityA0 = 38,153.92 m/s

currentDistance = 44.3601809695 AU

//seyllin VI

initialDistance = 2.785 AU, orbitPeriod = 390 days

orbitVelocityO1 = 77,687.74 m/s, escapeVelocityA0 = 35,697.96 m/s

currentDistance = 41.7266865916 AU

//seyllin VII

initialDistance = 3.584 AU, orbitPeriod = 570 days

orbitVelocityO1 = 68,404.56 m/s, escapeVelocityA0 = 31,468.21 m/s

currentDistance = 37.0170975880 AU

//seyllin VIII

initialDistance = 6.501 AU, orbitPeriod = 1394 days

orbitVelocityO1 = 50,735.19 m/s, escapeVelocityA0 = 23,365.01 m/s

currentDistance = 28.4691808924 AU

//seyllin IX

initialDistance = 18.515 AU, orbitPeriod = 6699 days

orbitVelocityO1 = 30,068.08 m/s, escapeVelocityA0 = 13,845.04 m/s

currentDistance = 24.9588363006 AU

So we can see that every planet in the Seyllin system would have an orbit velocity (under a O1 star) which would exceed the escape velocity for the reduced mass sun (A0)... meaning every planet in the system is going to escape the A0 eventually. Indeed, by the end of 1022.75 days, most of the planets are already moving nearly asymptotically away from their star. None quicker that the shattered planet itself, Seyllin I, which by now should more accurately be called Seyliln IX at 91.3 AU away from system center, indeed the planets would properly be in complete reverse order by now.

Of course we can always blame the planets all still being in orbit on some strange graviton burst that came out of that first explosion and magically restabilized the planets' orbits. But even that doesn't excuse the show info windows which still show orbit radii and periods consistent with a O1 star with a mass of 3.76e31 kg. What have those astrophysicists been doing these last 2.8 years? And why wont they update the NeoCom? <bashrant> --Faulx 0526 12.30.2011

Haha. Ok, you went into a lot more detail than I ever did in contemplating this situation. I didn't realize they would be ejected so quickly. I'm not sure there's a simple solution to this, but I know Abraxas is watching these talk pages as well, so he'll know about the discrepancy. Hopefully it's something that can be fixed. This is why I love EVE's players. I can learn a physics definition.--ISD Caleb Kang 04

50, 31 December 2011 (UTC)

This is going on our long-term fix list, and will be reviewed once we have time and my brain has unmelted.--CCP Abraxas 14:18, 23 January 2012 (UTC)