Information on Service 'Scans of the Palomar-Leiden Trojan Survey Plates'

[Use this service from your browser]

Further access options are discussed below

This service publishes plate scans of the Palomar-Leiden Troian surveys conducted between 1960 and 1977. The surveys led to the discovery of more than 2,000 asteroids (1,800 with orbital information), with another 2,400 asteroids, including 19 Trojans, found after further analysis of the plates.

Note that because of the large size of the plates, in this service each original plate is contained in two parts, marked with "_1" and "_2", respectively. The central parts of the two parts overlap.

For a list of all services and tables belonging to this service's resource, see Information on resource 'Scans of the Palomar-Leiden Trojan Survey Plates'

Service Documentation

Most plates had a Kodak 103a-O emulsion, exposed through a WG-2 filter.

One pair per field was taken each month on Kodak 103a-D emulsion, using a Y-6 filter.

Best effort is made in determining emulsion and filter; metadata regarding those values are incomplete.

Overview

You can access this service using:

Coverage

1.87855 3.7571 eV

1960.7 1960.86
1965.04 1965.11
1971.19 1971.42
1972.19 1972.25
1973.69 1973.81
1977.75 1977.85

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
hscs_pos Plate contains Coordinates (as h m s, d m s or decimal degrees) or SIMBAD-resolvable object the plate must contain N/A N/A
imageTitle Title Synthetic name of the image N/A meta.title

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
accref Product key Access key for the data N/A meta.ref.url
accsize File size Size of the data in bytes byte VOX:Image_FileSize
bandpassId Bandpass Freeform name of the bandpass used N/A instr.bandpass
centerAlpha Ctr. RA Approximate center of image, RA deg pos.eq.ra
centerDelta Ctr. Dec Approximate center of image, Dec deg pos.eq.dec
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 meta.title

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
centerAlpha Ctr. RA Approximate center of image, RA deg pos.eq.ra 0
centerDelta Ctr. Dec Approximate center of image, Dec deg pos.eq.dec 0
imageTitle Title Synthetic name of the image N/A meta.title 0
dateObs Obs. date Epoch at midpoint of observation d VOX:Image_MJDateObs 0
accref Product key Access key for the data N/A meta.ref.url 1
platenum Plate ID Plate ID N/A meta.id 1
pub_did PubDID Publisher data set id; this is an identifier for the dataset in question and can be used to retrieve the data through, e.g., datalink. N/A meta.id;meta.main 1
bandpassId Bandpass Freeform name of the bandpass used N/A instr.bandpass 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/pixel pos.wcs.scale 12
instId Instrument Identifier of the originating instrument N/A meta.id;instr 15
pixelSize Axes Lengths Number of pixels along each of the axes pixel pos.wcs.naxis 15
platepart Plate Part Scan index. Since the scanner used to digitise the plate was physically smaller than the plates, each plate scan consists of two parts. This number is either 1 or 2 correspondingly. N/A meta.id.part 15
wfpdb_id WFPDB Plate identifier as in the WFPDB N/A meta.id 15
exposure Exp. time Effective exposure time s time.duration;obs.exposure 15
object Targ. Obj. Special object on plate N/A meta.id 15
obsnotes Notes Observation Notes N/A meta.note 18
mime Type MIME type of the file served N/A meta.code.mime 20
nAxes #axes Number of axes in data N/A pos.wcs.naxes 20
refFrame Ref. Frame Coordinate system reference frame N/A pos.frame 20
wcs_equinox Equinox Equinox of the given coordinates yr time.equinox 20
wcs_projection Proj. FITS WCS projection type N/A pos.wcs.ctype 20
wcs_refPixel Ref. pixel WCS reference pixel pixel pos.wcs.crpix 20
wcs_refValues Ref. values World coordinates at WCS reference pixel deg pos.wcs.crval 20
wcs_cdmatrix CD matrix FITS WCS CDij matrix deg/pixel pos.wcs.cdmatrix 20
bandpassUnit Bandpass unit Unit of bandpass specifications (always m). N/A N/A 20
bandpassRefval Band Ref. Characteristic quantity for the bandpass of the image m instr.bandpass;stat.median 20
bandpassHi Band upper Upper limit of the bandpass (in BandPass_Unit units) m instr.bandpass;stat.max 20
bandpassLo Band lower Lower limit of the bandpass (in BandPass_Unit units) m instr.bandpass;stat.min 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 meta.code 20
coverage Coverage Field covered by the image deg N/A 20
emulsion Emulsion Emulsion of the original plate Note e N/A instr.plate.emulsion 21
owner Owner Owner of the data N/A N/A 25
embargo Embargo ends Date the data will become/became public yr N/A 25

Based on photographic plates obtained with the Samuel Oschin telescope at Palomar Observatory. Digitization project by the Astronomisches Rechen-Institut (ARI/ZAH), Heidelberg in collaboration with the Institut fuer Erdmessung (IFE), Hannover and funded by the Klaus Tschira Foundation gGmbH.

Citation Info

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

Note e

Most exposures were made on Kodak 103a-O emulsion, with a WG2 filter.

One pair per field was taken each month on Kodak 103a-D emulsion, using a Y-6 filter.

Best effort is made in this service to reliably identify the emulsion and filter used in each exposure, but plate metadata has been incomplete. Use the information with caution.