so, you’ve just grabbed a pretty standard resistor from your parts bin ? That’s probably ok for breadboard trials. What ohm measurement do you make of it ? Colour is really hard to be sure of in photos, but that looks like Orange/Brown/Yellow+Gold, which makes it by my calcs a 310K resistor with 5% tolerance. But who knows how it’s temperature and voltage performance is - probably less than ideal but again probably not significant amounts of drift in the ranges you’re likely to want to care about.
Let me ask you again. Does your calculation of temperature now correlate correctly with the ambient temperate you are now experiencing ?