Table information for 'alerce_tap.ztf_forced_photometry'

General

Table Description:

ZTF forced photometry measurements at known object positions, including magnitudes with and without host galaxy corrections, image quality metrics (seeing, background, zero point), reference source properties, and processing status flags.

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

Resource Description:

Multi-survey astronomical object catalog containing astrometric and statistical information from multiple surveys. This table provides aggregated properties for astronomical objects including position, detection statistics, and temporal coverage.

For a list of all services and tables belonging to this table's resource, see Information on resource 'ALeRCE Multi-Survey Object Catalog'

Citing this table

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

@MISC{vo:alerce_tap_ztf_f,
  year=2026,
  title={{ZTF} Forced Photometry},
  author={{ALeRCE} Team},
  url={http://tap.alerce.online/tableinfo/alerce_tap.ztf_forced_photometry},
  howpublished={{VO} resource provided by the {ALeRCE} {TAP} service}
}

Columns

Sorted alphabetically. [Sort by DB column index]

NameTable Head DescriptionUnitUCD
adpctdif1 Adpctdif1 Adaptive percentile difference 1 N/A stat.value
adpctdif2 Adpctdif2 Adaptive percentile difference 2 N/A stat.value
chinr Chinr Chi of nearest source N/A stat.fit.chi2
clrcoeff Clrcoeff Color coefficient N/A arith.factor
clrcounc Clrcounc Color coefficient uncertainty N/A stat.error;arith.factor
corrected Corrected Correction applied flag N/A meta.code.qual
created_date Created_date Date record was created N/A time.creation
decnr Decnr Dec of nearest source deg pos.eq.dec
diffmaglim Diffmaglim Difference image magnitude limit mag phot.mag;stat.min
distnr Distnr Distance to nearest source arcsec pos.angDistance
dubious Dubious Dubious measurement flag N/A meta.code.qual
e_mag E_mag Magnitude error mag stat.error;phot.mag
e_mag_corr E_mag_corr Corrected magnitude error mag stat.error;phot.mag;arith.corrected
e_mag_corr_ext E_mag_corr_ext Extended corrected magnitude error mag stat.error;phot.mag
exptime Exptime Exposure time s time.duration;obs.exposure
field Field Field number N/A obs.field
isdiffpos Isdiffpos Difference image positive flag N/A meta.code
mag Mag Magnitude mag phot.mag
mag_corr Mag_corr Corrected magnitude mag phot.mag;arith.corrected
magnr Magnr Magnitude of nearest source mag phot.mag
magzpsci Magzpsci Magnitude zero point mag phot.calib
magzpscirms Magzpscirms Magnitude zero point RMS mag stat.stdev;phot.calib
magzpsciunc Magzpsciunc Magnitude zero point uncertainty mag stat.error;phot.calib
measurement_id Measurement_id Measurement identifier N/A meta.id
oid Oid Object identifier N/A meta.id;src
parent_candid Parent_candid Parent candidate ID N/A meta.id
pid Pid Processing ID N/A meta.id
procstatus Procstatus Processing status N/A meta.code.status
programid Programid Program ID N/A obs.program
ranr Ranr RA of nearest source deg pos.eq.ra
rcid Rcid Readout channel ID N/A instr.det
rfid Rfid Reference image ID N/A meta.id
scibckgnd Scibckgnd Science image background N/A instr.skyLevel
sciinpseeing Sciinpseeing Science image seeing arcsec instr.obsty.seeing
scisigpix Scisigpix Science image sigma per pixel N/A stat.stdev;instr.pixel
sharpnr Sharpnr Sharpness of nearest source N/A stat.value
sid Sid Survey identifier N/A meta.id
sigmagnr Sigmagnr Magnitude error of nearest source mag stat.error;phot.mag

Columns that are parts of indices are marked like this.

VOResource

VO nerds may sometimes need VOResource XML for this table.