I'm having trouble calculating the position of an object, given its current RA and DEC. I'm trying to use PyEphem to accomplish this task, but the RA and DEC I calculate are not what I expect. It seems to me that if I've set the epoch to ephem.now(), the calculated RA and DEC should be the same as the initially supplied RA and DEC. Given the nature of my application, I don't know the J2000 coordinates of the source. Could this relate to the deflection/aberration/nutation issue here?
import ephem
body = ephem.FixedBody()
body._epoch = ephem.now()
body._ra = "7:09:07.54"
body._dec = "-49:35:11.1"
body.compute(ephem.now(), epoch=ephem.now())
print("RA: {}, DEC: {}".format(body.ra, body.dec))
# RA: 7:09:06.12, DEC: -49:35:32.6
print("_RA: {}, _DEC: {}".format(body._ra, body._dec))
# _RA: 7:09:07.54, _DEC: -49:35:11.1
