Luminosity somewhere around ten-thousandth of the sun. In the range of 1000 Fahrenheit, make some nice Chinese food with it. Mostly IR spectrum. Obscured even further in the oort cloud, though possibly on this side now if correct and these anomalies coming from around 5AU is it (from that last vid).
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As for mass, well depends on it's size I guess. Heavier than Jupiter is a safe bet. So yeah it could toss some rocks around. It could even send a planet rogue. Space is pretty big though, ya know? I'm less concerned about that.
But if it's a brown dwarf, it's emissions would probably be more of the concern compared to it's gravitational field. While it could possibly throw some rocks at us, it's particles/gasses would certainly have some impact on our weather and our geomagnetic field, our magnetosphere. It would also cause effect on the sun. I guess depends how close it's orbit, but with such a long circuit it's probably not too close in.
Odd things are happening though, such as with the increased helium, being bombarded from not only the sun but from outside in the solar system. NASA is saying disruptions from way far off out of the solar system with he solar winds, but the angle it's hitting us from is changing as we make our circuit around the sun. You know, as like in radio frequency triangulating?
As others are saying somewhere around 5AU. The magnetosphere collapsing? Well more like being condensed down last month, that's better put since a full collapse would put it on the ground. But certainly it was condensed down, almost to the point of needing to evacuate the ISS. I was watching it for those few days, interesting. That was during the last full moon as I recall.
Now that's pretty close though, 5AU, ranges it at about the distance of Jupiter, but maybe more like 5AU+. They are saying out of Orion which is a little left of the moon right now. I see all these supposed photos, but they are trying to track something behind the sun which is opposite side out there by Libra right now. But 5AU, other side of the asteroid belt, Jupiter and outward.
Edit: and just to say, some are certain it's a conspiracy, that NASA knows the truth, but I think NASA just doesn't know at this point. Or they might have figured it out recently, which being why 0bama gave that executive order last month about "space weather events". If that is the case, certainly not all of NASA knows, or someone would have leaked it.