Update UT1 - UTC
27nov07
UT1 - UTC (DUT1) is used to
convert
from UTC to UT1. This is needed for pointing the
telescope.
The Earth orientation dept. of the USNO publishes the measured and
predicted
values for DUT1. There is usually about 1 year of data available.
A fit is done to the "future"
values and
then
used for the pointing. It is stored in the file :
/home/online/vw/etc/Pnt/utcToUt1.dat
.
Plots of the fit residuals show:
- Top: Black is the data and red is the fit.
- Center
and bottom plots
show the fit error in mjd and date.
- 28feb12 (.ps) (.pdf)
- data was loaded for 24feb12 thur 30jun12 (then a leap sec
will be installed).
- 19apr11 (.ps) (.pdf)
- data was loaded for 15apr11 thru 15apr12z and fit.
- 08feb10 (.ps) (.pdf)
- data was loaded for 08feb10 thru 04feb11 and fit.
- 13dec08 (.ps) (.pdf)
- data was loaded for 01jan09 thru 11dec09 and fit
- This is needed for the leap second on 01jan09
- 27nov07 (.ps) (.pdf)
- New
data was loaded 27nov07 and refit.
- This is after the painting project
and before the new pointing model.
- 07dec06 (.ps)
(.pdf):
- data was loaded 07dec06 thru 01jul07
- The fit was needed because the old fit was
no
longer valid.
Most recent utcToUt1.dat file
processing:
/home/online/vw/etc/Pnt/utcToUt1.pro,
cputctout1.sc
page
up
home ~phil