Each entry contains a position, a Quasi-V magnitude (`QV mag`) and a Quasi-B magnitude (`QB mag`). The former comes mostly from the northern Palomar survey, and the latter from the UK SERC Schmidt survey. Near equatorial regions, where the surveys overlap, both magnitudes are available. But for the majority of cases only one or the other will be given. A code (`CV` and `CB`) gives further information on the emulsion and filter used.
The default cone search radius is 1 arc minute. Be careful in selecting larger values for the cone search radius: for example, setting it to be 30 arcminutes will typically result in a sample that contains hundreds, if not thousands, of stars. We recommend that cone search radii of more than 30 arcminutes not be used.
Each entry contains a position, a Quasi-V magnitude (`QV mag`) and a Quasi-B magnitude (`QB mag`). The former comes mostly from the northern Palomar survey, and the latter from the UK SERC Schmidt survey. Near equatorial regions, where the surveys overlap, both magnitudes are available. But for the majority of cases only one or the other will be given. A code (`CV` and `CB`) gives further information on the emulsion and filter used.
We recommend that cone searches should not exceed a radius of 30 arc min, since, as you will quickly discover, a radius of 30 arc mins usually contains hundreds if not thousands of stars. To `cover' a larger area, then, you should do a mosaic of 30 arc minute searches with offset co-ordinates. Notice that the default cone search radius is 1 arc minute.
RA
The Right Ascension of the star.
Dec
The Declination of the star.
LII
The galactic longitude of the star.
BII
The galactic latitude of the star.
QV_Mag
Each entry contains a position, a Quasi-V magnitude (`QV mag`) and a
Quasi-B magnitude (`QB mag`). The former comes mostly from the northern
Palomar survey, and the latter from the UK SERC Schmidt survey. Near
equatorial regions, where the surveys overlap, both magnitudes are
available. But for the majority of cases only one or the other will be
given. A code (`CV` and `CB`) gives further information on the emulsion and
filter used.
QV_Err
The uncertainty in the Quasi-V magnitude value.
QB_Mag
Each entry contains a position, a Quasi-V magnitude (`QV mag`) and a
Quasi-B magnitude (`QB mag`). The former comes mostly from the northern
Palomar survey, and the latter from the UK SERC Schmidt survey. Near
equatorial regions, where the surveys overlap, both magnitudes are
available. But for the majority of cases only one or the other will be
given. A code (`CV` and `CB`) gives further information on the emulsion and
filter used.
QB_Err
The uncertainty in the Quasi-B magnitude value.
CV
The bandpass codes used are (see ST Preprint no. 363, p. 102, table VI.):
------------------------------------------------------------------------
Code Emulsion Filter
---- -------- ------
1 IIaD W12
6 IIaD GG495
8 103aE Red plexiglass
10 IIaD GG495
------------------------------------------------------------------------
Note that the passbands are (unfortunately) solely defined by the
emulsion/filter combination; they bear only little resemblance to
standard magnitudes (e.g., B or V). Since we do not have any color
information (yet - wait 5 years until we have the next surveys),
an individual transformation into a standard system is not possible.
CB
The bandpass codes used are (see ST Preprint no. 363, p. 102, table VI.):
------------------------------------------------------------------------
Code Emulsion Filter
---- -------- ------
0 IIIaJ GG395
11 103aO GG400
18 IIIaJ GG385
------------------------------------------------------------------------
Note that the passbands are (unfortunately) solely defined by the
emulsion/filter combination; they bear only little resemblance to
standard magnitudes (e.g., B or V). Since we do not have any color
information (yet - wait 5 years until we have the next surveys),
an individual transformation into a standard system is not possible.
PCount
The number of plates used in calculating the position.
XClass
The classification flag uses the following codes:
------------------------------------------------------------------------
Code Meaning
---- -------
1 Star
2 Galaxy
3 Non-Star
5 Artifact
------------------------------------------------------------------------
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