Table information for 'ccd_observations.main'

General

This table is available for ADQL queries and through the TAP endpoint.

Resource Description: Reduced, astrometrically calibrated CCD images obtained with telescopes operated by the Fesenkov Astrophysical Institute. The initial release contains observations from the Zeiss-1000 East telescope at the Tian Shan Astronomical Observatory; further FAI telescopes will be added as their reduced data become available. Discovery metadata remain public during proprietary periods. Before the RELEASE date, downloads contain the original FITS headers but zero-valued data arrays; afterwards the original FITS product is delivered.

For a list of all services and tables belonging to this table's resource, see Information on resource 'FAI CCD Photometric Observations'

Resource Reference URL: Resource info

Citing this table

To cite the table as such, we suggest the following BibTeX entry:

@MISC{vo:ccd_observations,
  year=2026,
  title={{FAI} {CCD} Photometric Observations},
  author={Fesenkov Astrophysical Institute},
  url={https://dachs.fai.kz/tableinfo/ccd_observations.main},
  howpublished={{VO} resource provided by the {FAI} archives}
}

Columns

Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
dataproduct_type Product type High level scientific classification of the data product, taken from an enumeration N/A meta.code.class
dataproduct_subtype Subtype Data product specific type N/A meta.code.class
calib_level Calibration level Amount of data processing that has been applied to the data [Note calib] N/A meta.code;obs.calib
obs_collection Collection Name of a data collection (e.g., project name) this data belongs to N/A meta.id
obs_id Obs. Id Unique identifier for an observation N/A meta.id
obs_title Title Free-from title of the data set N/A meta.title;obs
obs_publisher_did Pub. DID Dataset identifier assigned by the publisher. N/A meta.ref.ivoid
obs_creator_did Creator DID Dataset identifier assigned by the creator. N/A meta.id
access_url Access URL The URL at which to obtain the data set. N/A meta.ref.url
access_format Media Type MIME type of the resource at access_url N/A meta.code.mime
access_estsize Size Estimated size of data product kbyte phys.size;meta.file
target_name Target Name Object a targeted observation targeted N/A meta.id;src
target_class Target Class Class of the target object (star, QSO, ...) N/A src.class
s_ra RA RA of (center of) observation, ICRS deg pos.eq.ra
s_dec Dec Dec of (center of) observation, ICRS deg pos.eq.dec
s_fov FoV Approximate spatial extent for the region covered by the observation deg phys.angSize;instr.fov
s_region coverage Region covered by the observation, as a polygon N/A pos.outline;obs.field
s_resolution Space Res. Best spatial resolution within the data set arcsec pos.angResolution
t_min Min. t Lower bound of times represented in the data set d time.start;obs.exposure
t_max Max. t Upper bound of times represented in the data set d time.end;obs.exposure
t_exptime Exp. Time Total exposure time s time.duration;obs.exposure
t_resolution Res. t Minimal significant time interval along the time axis s time.resolution
em_min λ_min Minimal wavelength represented within the data set m em.wl;stat.min
em_max λ_max Maximal wavelength represented within the data set m em.wl;stat.max
em_res_power λ/Δλ Spectral resolving power lambda/delta lambda N/A spect.resolution
o_ucd Obs. UCD UCD for the product's observable N/A meta.ucd
pol_states Pol. States List of polarization states in the data set N/A meta.code;phys.polarization
facility_name Facility Name of the facility at which data was taken N/A meta.id;instr.tel
instrument_name Instrument Name of the instrument that produced the data N/A meta.id;instr
s_xel1 |X| Number of elements (typically pixels) along the first spatial axis. N/A meta.number
s_xel2 |Y| Number of elements (typically pixels) along the second spatial axis. N/A meta.number
t_xel |t| Number of elements (typically pixels) along the time axis. N/A meta.number
em_xel |λ| Number of elements (typically pixels) along the spectral axis. N/A meta.number
pol_xel |Pol| Number of elements (typically pixels) along the polarization axis. N/A meta.number
s_pixel_scale Pix. Scale Sampling period in world coordinate units along the spatial axis arcsec phys.angSize;instr.pixel
em_ucd Spect. UCD Nature of the product's spectral axis (typically, em.freq, em.wl, or em.energy) N/A meta.ucd
source_table Source Table Name of a TAP-queriable table this data originates from. This source table usually provides more information on the the data than what is given in obscore. See the TAP_SCHEMA of the originating TAP server for details. N/A meta.id;meta.table
telescope_name Telescope Telescope inferred from the managed archive path. N/A instr.tel
filter_name Filter Normalised photometric filter name. N/A meta.id;instr.filter
image_type Image type Image type reported by the FITS header. N/A meta.code.class;obs
ncombine Combined Number of individual exposures combined into the product. N/A meta.number
x_binning X bin Detector binning along the first image axis. N/A meta.number;instr.pixel
y_binning Y bin Detector binning along the second image axis. N/A meta.number;instr.pixel
release_date Public after Date on which the FITS product becomes publicly accessible. N/A time.release
data_policy_class Policy FAI data-policy class from the OBS-CLSS FITS keyword. N/A meta.code.class
proposal_id Proposal FAI observing-proposal identifier. N/A meta.id;obs.proposal
pi_name PI Principal investigator named in the FITS header. N/A meta.id.assoc
coi_name Co-I Co-investigators named in the FITS header. N/A meta.id.assoc
source_path Source Path of the source FITS relative to the DaCHS inputs directory. N/A meta.ref.url;meta.file
source_mtime Source modified Modification time of the source FITS at its latest ingest. N/A time;meta.file

Columns that are parts of indices are marked like this.

Other

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VOResource

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Notes

Note calib

The calib_level flag takes the following values:

0 Raw Instrumental data requiring instrument-specific tools
1 Instrumental data processable with standard tools
2 Calibrated, science-ready data without instrument signature
3 Enhanced data products (e.g., mosaics)