Why does the size matter? Because it involves an estimate on how much matter is accreting to it.
According to scientists, it has also been known for gaining 6 billion tonnes of mass a second in an outburst beginning in June 2025.*
Now, how big is the planet or object supposed to be? 2.8 times the radius of Jupiter = 21.952 times the volume of Jupiter. The mass is however estimated to 6—10 times the mass of Jupiter.
How far away is it? 620 light years away, they say. What if that is just one light day?**
69 911 km is Jupiter's mean radius.***
69 911 km * 2.8 is the supposed radius of Cha 1107-7626, that being = 195 750.8 km
620 * 365.25 = 226 455 distance discrepancy = one dimensional size discrepancy.
195 750.8 km / 226 455 = 864.4 m.
(195 750.8 km)^3 = 7 500 852 698 100 840 512 000 000 (m)^3
(864.4 m)^3 = 645 868 753.984 (m)^3
7 500 852 698 100 840 512 000 000 / 645 868 753.984 = volume discrepancy or three dimensional size discrepancy = 11 613 586 586 798 497
Can we presume this is soemwhat equal to mass discrepancy, even if mass is not strictly always proportional to just volume?
6 billion metric tons = 6 000 000 000 000 kg This is what the object is supposed to be gobbling up every second. Let's apply the volume discrepancy as mass discrepancy ...
6 000 000 000 000 kg / 11 613 586 586 798 497 = 0.517 g, per second./HGL
* https://en.wikipedia.org/wiki/Cha_1107−7626
Quote Sourced: Six billion tonnes a second: Rogue planet found growing at record rate
** If you have problems seeing how stars in general and also exo-planets could only be one light day away, perhaps you aren't Geocentric? See my story and initial reflection in Have you heard the expression "von Neumann chain"?
*** https://en.wikipedia.org/wiki/Jupiter
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