comet Ephemeris
comet Ephemeris
Hmmmm.... Does anyone know how to read it. The dates and position of comets are based on the position of which place wat Universal Time (UT). Etc. NASA Jet Propulsion Lab
Are you incidently referring to something like this:
http://cfa-www.harvard.edu/iau/Ephemeri ... 002T7.html
which is the ephemeris for T7?
It is pretty straight forward as you just need to refer to the date of observation, take note of the RA and DEC coordinates. Ignore the magnitude estimates as they are currently inaccurate. However, my usual mode of tracking down the position of any given comet is by loading the emphemeris information into my planetarium software and the rest of the positional statistic is done by the software.
http://cfa-www.harvard.edu/iau/Ephemeri ... 002T7.html
which is the ephemeris for T7?
It is pretty straight forward as you just need to refer to the date of observation, take note of the RA and DEC coordinates. Ignore the magnitude estimates as they are currently inaccurate. However, my usual mode of tracking down the position of any given comet is by loading the emphemeris information into my planetarium software and the rest of the positional statistic is done by the software.
But a problem is, etc a comet is at tis R.A. and DEC at a particular date, does that mean that the comet will be at that position for the whole night? Wouldn't it change position with different time in the night? NASA is located in U.S. wouldn't the date they give be at least a few hours behind us. 
:roll: :roll: 
:roll: :roll: That's why I mentioned using software for reliance. But frankly, even with the change in RA&DEC for a given date, the change is small relative to the visibility of the comet (unless you are talking about seeing mag 10-12 or dimmer comets), and the given RA and DEC is enough to spot a mag 4 comet. i have used both software and manual (RA&DEC plotted position on my atlas) methods for comet hunting both now and in the past, and it has worked well so far.