Absolute Magnitude
The size of an object can be calculated from its absolute magnitude (H) and the albedo (the amount of light it reflects). 2007 OR10 has an absolute magnitude (H) of 2.0, which makes it the fifth-brightest TNO known, a little less bright than Sedna (H=1.6; D=1,000 km) and brighter than Orcus (H=2.3; D≈800 km).
2007 OR10 is among the reddest objects known. This is probably in part due to methane frosts, which turn red when bombarded by sunlight and cosmic rays.
Read more about this topic: (225088) 2007 OR10
Famous quotes containing the words absolute and/or magnitude:
“Mathematics ... would certainly have not come into existence if one had known from the beginning that there was in nature no exactly straight line, no actual circle, no absolute magnitude.”
—Friedrich Nietzsche (1844–1900)
“My time has come.
There are twenty people in my belly,
there is a magnitude of wings,
there are forty eyes shooting like arrows,
and they will all be born.
All be born in the yellow wind.”
—Anne Sexton (1928–1974)