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About ProtoJeb21

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    The Exoplaneteer

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  • Location EPIC 248435473 g
  • Interests Astronomy, planetary science/exoplanetology, entomology, meteorology (mainly tropical cyclones), Star Wars, Gravity Falls, drawing, data analysis, mathematics, and hiking.

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  1. ProtoJeb21

    An extremely magnetic Rogue Planet

    This "shrinking" is observed and predicted to happen to most, if not all, forming gas planets. A good example is the Kepler-51 system; in a recent study, it was determined that the three extremely puffy planets, all less massive than Neptune, are only about 500 million years old and will eventually become somewhat denser as their bloated atmospheres contract. However, this process is usually seen with directly imaged Jupiter-mass or Super-Jupiter exoplanets.
  2. ProtoJeb21

    An extremely magnetic Rogue Planet

    It is still young and hot, so its radius will likely shrink with time as it cools. I’m assuming it’s from metallic hydrogen as well. Since there’s so much of it in such a tight space, it would explain why SIMP has such a strong magnetic field. I wonder if scientists can try to determine how fast it rotates; a quick rotation will also help explain its magnetosphere.
  3. ProtoJeb21

    Weather Chat Megathread

    The East Pacific is going absolutely nuts. Hurricane Hector keeps on getting stronger, with winds of 155 mph and a pressure of 936 mbar, just a hair away from being the first EPac Category 5 since Patricia. In fact, it may be a Category 5 already. The latest low-level recon flight (it’s close enough to Hawaii from Hurricane Hunters craft to get into it) found winds of up to 170 mph on one side of Hector’s eyewall. Based on how well organized the system is, with a very tight ring of powerful thunderstorms, I find it likely that Hector will become a Category 5. There are now two tropical storms off the coast of Mexico, Ileana and John. Both are set to become hurricanes by later today or early tomorrow, and they’re dangerously close together. John is likely going to absorb or destroy Ileana before rapidly intensifying. Some models suggest it could become another Category 4/5. Meanwhile, Ileana probably won’t be anything more than a weak Category 1. The last Invest in the East Pacific isn’t looking as good as it was a few days ago, but most models predict it will develop within the next day. It has the potential to become a hurricane as well, maybe a Category 1 or 2. The GFS model predicts that it will be pulled north by Hurricane John and undergo a Fujiwhara interaction; the same thing happened to hurricanes Hilary and Irwin last July. EDIT: The latest NHC forecast for Tropical Storm Ileana says that it will not reach hurricane strength as originally predicted; it won’t have enough time before being absorbed by the recently upgraded Hurricane John. The latter will end up as at least a high-end Category 3 hurricane.
  4. ProtoJeb21

    Weather Chat Megathread

    Hurricane Hector has been quite an interesting system to track over the last few days. Being such a small storm, with a tight ring of convection and a wind field less than 100 miles across, it’s been more unpredictable than the other powerful East Pacific storms so far this year. Its small size is likely why it’s gone through two periods of rapid intensification. Hector is currently a high-end Category 3 but will likely become this season’s third Category 4 by later tonight or early tomorrow. I believe it may intensify even further, based on its impressive convective structure and how more models are showing it tracking south of Hawaii into warmer, more favorable waters. Some models are suggesting that Hector may survive its journey through the Central Pacific basin and enter the West Pacific, similar to Hurricane/Typhoon Genevieve in 2014. With Hector still going strong, TD 11-E poised to strengthen, and another tropical system likely to develop, this is quite the time to be watching the East Pacific. Meanwhile, the days of rain are finally over where I live. Mostly. With the exception of next Wednesday, there will be NO rainy or stormy days for almost two weeks! The humidity will remain, sure, but otherwise it’ll be quite nice, with mainly or entirely sunny skies and temperatures from the low 80’s to around 90.
  5. ProtoJeb21

    An extremely magnetic Rogue Planet

    Since SIMP is so massive - about 4,039 times the mass of Earth - it likely formed with several planet-sized moons. Usually, satellites of gas giants have around 0.0001 times their parent planet’s mass. This can be seen with the Galilean moons and several of Saturn’s largest moons like Rhea, Iapetus, and Tethys. Any moons around SIMP would likely be around 0.35 to 0.45 Earth masses, large enough to retain a pretty decently sized atmosphere. While at least one has to be Io-like to produce those auroras, it’s not out of the realm of possibility that another moon could be heated to Earth-like temperatures where liquid water can pool on the surface, if it has a thick enough atmosphere. Who knows? Strong tidal forces plus multiple giant moons can lead to some very bizarre and amazing outcomes.
  6. A massive rogue “Super-Jupiter” just 20 light years away discovered back in 2016 was revealed to have an incredibly powerful magnetic field 4 million times stronger than Earth’s. For comparison, this dwarfs Jupiter’s magnetosphere, which is several hundred thousand times stronger than ours. Massive auroras were also detected on this planet. Since it has no star to fuel these light shows, they could be created by a volcanic moon like Io.
  7. ProtoJeb21

    Weather Chat Megathread

    *kicks thread back to life* Weather in New England has been berserk over the last two weeks, due to an unusual summertime dip in the jet stream. For nearly a week, I had to deal with random on-and-off storms coming from the south, being pulled up by the jet stream. This setup began to slightly change over the next few days. Mercifully, this resulted in some decent days where I could finally get outside. For the last week or so, the dramatic jet stream dip has lessened a bit, so now storms are coming at us in a more typical SW to NE or W to E direction. They’ve become more predictable and less frequent, leading to a few nice sunny days. It was especially nice in Plymouth when I visited there Friday and Saturday. However, one major problem remained: the humidity. Temperatures have already been in the mid to high 80’s for days now, and constant 60-80% humidity does not help. Heat index values have been maxing out in the mid to high 90’s since late last week. This can sometimes make even a few minutes outside almost unbearable. Fun. It also doesn’t help that the storms over the last two days have been some of the strongest during this two week timeframe. My area was under a Severe Thunderstorm Warning both today and Wednesday, and various flood advisories have been issued as well. Thankfully, no major damage has been reported.
  8. ProtoJeb21

    What is your save/space agency called?

    Since version 0.90 I’ve had a tradition of making a main science mode save named “Solar System SCIENCE!” Until around 1.2 I would always replace the previous SSS with a new one when the game updated, but from 1.2 to 1.3 I used the same save. I’ve also kept the one I made for 1.3 through 1.4.4, and I’m still using it now.
  9. ProtoJeb21

    How to fire a Kerbal

    If he manages to survive the thousands of Kerbals he’s killed that have come for their revenge.
  10. ProtoJeb21

    Weather Chat Megathread

    That was the last thing I was expecting today. It’s been so long since Beryl first dissipated that I assumed its remnants would be unable to reform.
  11. ProtoJeb21

    New analysis of the 55 Cancri system

    It’s temperature has already been mapped with the Spitzer telescope (dayside of 2709 K, nightside of 1600 K) and indicates a Venus-level greenhouse effect from an atmosphere of carbon dioxide, nitrogen, and/or oxygen. This is in good agreement with the paper I linked above, but the Spitzer measurements suggested a lower atmospheric pressure of 1.4 bar instead of 90-3000 bar. Also, the surface gravity is not 8g, but 2.27g, even though it’ll likely feel like more depending on the exact atmospheric surface pressure of the planet.
  12. Using years’ worth of observations, a team of scientists have determined the most precise parameters for the 55 Cancri system. They were able to pin down the masses of the four gas planets to very low percent errors, determine the age of 55 Cancri, and study its Sun-like magnetic cycle. However, their most important accomplishment is finally figuring out the composition of 55 Cancri e/Janssen. Instead of being a Carbon Planet or a world with a thick steam layer, it turns out Janssen is far more likely to be rock-dominated with a thick (about 90-300 bar or less) atmosphere of heavy compounds like carbon dioxide, oxygen, nitrogen, and/or sodium. What’s interesting to note is that in the years following its discovery as a transiting RV planet, Janssen has been “shrinking” - new size estimates for it have gone down over time, while its calculated density has gone up. It is now believed to be almost exactly 8 times the mass of Earth and 87.5% larger with a suspicious density of 6.66 g/cm^3 (no wonder why it’s such a terrible place). You can read the full paper here:
  13. ProtoJeb21

    Weather Chat Megathread

    Chris is now a hurricane, with sustained winds of 85 mph (although the Hurricane Hunters aircraft currently inside the storm has found winds as high as 105 mph). It seems to be rapidly intensifying and seems likely to become a Category 2 or more before weakening and becoming post-tropical. Meanwhile, Taiwan and China are getting clobbered by Category 3 Typhoon Maria, which is likely to cause significant flooding and landslides.
  14. ProtoJeb21

    What's your dream planet?

    So, basically, it won’t be made of Tungsten but it’ll look like it is. I think that’s cooler and more exotic than a Tungsten-based metal planet.
  15. ProtoJeb21

    What's your dream planet?

    That may be possible. There’s this one planet candidate I found that’s so hot - around 5,500*F - that it would have to be made entirely of metals like Tungsten and Molybdenum in order to even exist. It would also lack an atmosphere due to getting over 28,000 times more radiation from its star than Earth, stripping any gases away.