I don't know that I would call that "objective."
It's a sticky business, and different ethicists will frame the words different ways. On one view, objective includes "It's true even if you disagree" and subjective includes "You can make up whatever you want". On another, objective includes "It's the same for everybody" and subjective includes "It's different for different people". The first distinction better matches the usual meaning of 'objective', and the second distinction better matches the usual meaning of 'subjective', so I think the terms were just poorly-chosen as different sides of a distinction.
Because of this, my intuition these days is to say that ethics is both subjective and objective, or "subjectively objective" as Eliezer has said about probability. Though I'd like it if we switched to using "subject-sensitive" rather than "subjective", as is now commonly used in Epistemology.
So, this isn't the first time I've seen this distinction made here, and I have to admit I don't get it.
Suppose I'm studying ballistics in a vacuum, and I'm trying to come up with some rules that describe how projectiles travel, and I discover that the trajectory of a projectile depends on its mass.
I suppose I could conclude that ballistics is "subjectively objective" or "subject-sensitive," since after all the trajectory is different for different projectiles. But this is not at all a normal way of speaking or thinking about ballistics...
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