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Yes. I would have liked to have seen something about the IR surveys. It was noted in the past, likely more than a year ago, that the IR surveys would have recorded such a large object, which would be glowing in IR. But, there was the chance that if the galactic plane happened to be in the background then it might go undetected. Are there any updates on this IR story?It seems continued searches come up short confirming planet nine is out there and that is how good astronomy measurements and testing work.
Yes, but that's would I would expect even if most every star has one of those. The transit method requires it to be in the plane of our view, but only closer objects will actually be seen to block starlight. A tiny fraction of a degree from our plane of view will make it unobservable. Worse yet is how long we would have to wait for it to cross the disk.FYI. I did a MS SQL query of exoplanets using this site, http://exoplanet.eu/ searching for 5 to 15 earth masses. 156 reported. The min semi-major axis is 0.0116 and max is 4 AU from the host star. Nothing like the searches for planet nine claims in solar system some 400 to 800 AU from the Sun.
That looks about right. I used 600 AU, 25,000km R (ice planet), 50% albedo (Geo) and got 20.6 ap. mag.