Information on Service 'Potsdam Kapteyn Plates Web Service'

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Further access options are discussed below

In the context of Kapteyn's plan to obtain a photometric standard, in Potsdam more than 400 photographic plates of several Selected Areas, Special Areas, and Kapteyn-Pritchard areas were obtained between 1910 and 1933, both as direct images and with an object prism. This service provides FITS images of the science area of the plates as well as images of the entire plates, including previous markings.

For a list of all services and tables belonging to this service's resource, see Information on resource 'Potsdam Kapteyn Series Plates'

Overview

You can access this service using:

This service is published as follows:

local means it is listed on our front page, ivo_managed means it has a record in the VO registry.

Other services provided on the underlying data include:

Input Fields

The following fields are available to provide input to the service (with some renderers, some of these fields may be unavailable):

NameTable Head DescriptionUnitUCD
dateObs Obs. date Epoch at midpoint of observation d VOX:Image_MJDateObs
hFORMAT Output format Requested format of the image data N/A N/A
hINTERSECT Intersection type Relation of image and specified Region of Interest. N/A N/A
hPOS Position ICRS Position, RA,DEC, or Simbad object (e.g., 234.234,-32.45) deg pos.eq
hSIZE Field size Size in decimal degrees (e.g., 0.2 or 1,0.1) deg N/A
object Targ. Obj. Special object on plate N/A meta.id

Default Output Fields

The following fields are contained in the output by default. More fields may be available for selection; these would be given below in the VOTable output fields.

NameTable Head DescriptionUnitUCD
acc4 Scaled 1/4 Original plate scaled to 25% N/A N/A
accref Product key Access key for the data N/A N/A
accsize File size Size of the data in bytes byte VOX:Image_FileSize
centerAlpha Ctr. RA Approximate center of image, RA deg POS_EQ_RA_MAIN
centerDelta Ctr. Dec Approximate center of image, Dec deg POS_EQ_DEC_MAIN
datalink_url Datalink URL to a datalink document for this plate (ancillary files, cutouts) N/A meta.ref.url
dateObs Obs. date Epoch at midpoint of observation d VOX:Image_MJDateObs
exposure Exp. time Effective exposure time s time.duration;obs.exposure
imageTitle Title Synthetic name of the image N/A VOX:Image_Title
instId Instrument Identifier of the originating instrument N/A INST_ID
object Targ. Obj. Special object on plate N/A meta.id
platephoto Photo Image of the plate including border and other markings. N/A meta.ref.url
wfpdb_id WFPDB Plate identifier as in the WFPDB N/A meta.id

VOTable Output Fields

The following fields are available in VOTable output. The verbosity level is a number intended to represent the relative importance of the field on a scale of 1 to 30. The services take a VERB argument. A field is included in the output if their verbosity level is less or equal VERB*10.

NameTable Head DescriptionUnitUCD Verb. Level
dateObs Obs. date Epoch at midpoint of observation d VOX:Image_MJDateObs 0
centerAlpha Ctr. RA Approximate center of image, RA deg POS_EQ_RA_MAIN 0
centerDelta Ctr. Dec Approximate center of image, Dec deg POS_EQ_DEC_MAIN 0
imageTitle Title Synthetic name of the image N/A VOX:Image_Title 0
accref Product key Access key for the data N/A N/A 1
acc4 Scaled 1/4 Original plate scaled to 25% N/A N/A 1
bandpassId Bandpass Freeform name of the bandpass used N/A VOX:BandPass_ID 10
accsize File size Size of the data in bytes byte VOX:Image_FileSize 11
pixelScale Scales The pixel scale on each image axis deg/pix VOX:Image_Scale 12
object Targ. Obj. Special object on plate N/A meta.id 15
wfpdb_id WFPDB Plate identifier as in the WFPDB N/A meta.id 15
instId Instrument Identifier of the originating instrument N/A INST_ID 15
exposure Exp. time Effective exposure time s time.duration;obs.exposure 15
datalink_url Datalink URL to a datalink document for this plate (ancillary files, cutouts) N/A meta.ref.url 15
platephoto Photo Image of the plate including border and other markings. N/A meta.ref.url 15
pixelSize Axes Lengths Number of pixels along each of the axes pix VOX:Image_Naxis 15
start_time Start UT at start of exposure d time.start;obs 15
end_time End UT at end of exposure d time.end;obs 15
mime Type MIME type of the file served N/A N/A 20
nAxes #axes Number of axes in data N/A VOX:Image_Naxes 20
refFrame Ref. Frame Coordinate system reference frame N/A VOX:STC_CoordRefFrame 20
wcs_equinox Equinox Equinox of the given coordinates yr VOX:STC_CoordEquinox 20
wcs_projection Proj. FITS WCS projection type N/A VOX:WCS_CoordProjection 20
wcs_refPixel Ref. pixel WCS reference pixel pix VOX:WCS_CoordRefPixel 20
wcs_refValues Ref. values World coordinates at WCS reference pixel deg VOX:WCS_CoordRefValue 20
wcs_cdmatrix CD matrix FITS WCS CDij matrix deg/pix VOX:WCS_CDMatrix 20
bandpassUnit Bandpass unit Unit of bandpass specifications (always m). N/A VOX:BandPass_Unit 20
bandpassRefval Band Ref. Characteristic quantity for the bandpass of the image m VOX:BandPass_RefValue 20
bandpassHi Band upper Upper limit of the bandpass (in BandPass_Unit units) m VOX:BandPass_HiLimit 20
bandpassLo Band lower Lower limit of the bandpass (in BandPass_Unit units) m VOX:BandPass_LoLimit 20
pixflags P. Flags Flags specifying the processing done (C-original; F-resampled; Z-fluxes valid; X-not resampled; V-for display only N/A VOX:Image_PixFlags 20
coverage Coverage Field covered by the image deg N/A 20
airmass Airmass Airmass at mean epoch N/A obs.airMass 21
observer Observer Observer N/A obs.observer 21
owner Owner Owner of the data N/A N/A 25
embargo Embargo ends Date the data will become/became public a N/A 25

Copyright, License, Acknowledgements

Kapteyn series plate scans is licensed under the `Creative Commons Attribution 3.0 License `_ .. image:: /static/img/ccby.png Support for scanning the plates and obtaining metadata was provided by DFG grant STE 710-6-1. We gratefully acknowledge support by Leibniz-Institut für Astrophysik Potsdam and the Bulgarian Academy of Sciences.

VOResource XML (that's something exclusively for VO nerds)