Note that due to occasional slow network speeds between the UK and
Europe, the name resolver can occasionally take several minutes to
return a result. We have, therefore, included a timeout which breaks
the network connection after a set-time. The default is 60 seconds,
but this can be changed in the Resolver Timeout box on the
form.
Search Coordinates
The centre, in the chosen astronomical coordinates system for the
region to be searched. Choose the required coordinate system
(Equatorial, Ecliptic or Galactic) and the Equinox from the option boxes.
If the coordinates are Equatorial, use one of the following formats
for the RA and DEC.
- Right Ascension (longitude)
- Declination (latitude)
-
sdd mm ss
-
sdd mm.m
-
sdegrees
e.g. 17 12 31, +45 32 48 or 17 12.52, +45 32.8 or
258.13, +45.547
If the coordinates are Galactic, use one of the following formats
for LII and BII.
- LII (longitude)
- BII (latitude)
e.g. 91.23, -30.12
Note that the longitude and latitude must be separated by a comma.
Filter Search
First choose the database parameter on which you wish to apply a filter from
the option box. A filter search can be perfomed either as a match
(i.e. select or database entries where parameter = value)
or over a range (i.e. select all database entries where minimum <=
parameter <= max). You can apply these filters to the
databases as inclusive or exclusive filters by selecting the
appropriate option.
For a match filter, enter the value for the filter in the Value box, for a range filter, enter the min and max values
in the left and right hand Range input boxes respectively.
Note: To request all entries in the database, leave all fields on the database query form blank.
Character Strings
Searches on character strings are case sensitive.
Strings can include the wildcards, asterix (*) and percent (%), which both
match variable length strings, or an underscore (_) which matches a single
length character.
Dates:
Acceptable formats for date strings are,
-
Year (Month Day Hrs Mins Secs) Month, Day etc. optional
-
Year.Day e.g. 1992.035
Exposure Time
Exposure times are almost invariably in units of seconds.
Coordinates
The coordinates for a filter should be typed in one of the following
formats,
- Right ascension
-
hh mm ss.s
-
hh mm.m
-
degrees
- Declination
-
sdd mm ss.s
-
sdd mm.m
-
sdegrees
- LII
- BII
