The Nançay Cometary Databaseivo://padc.obspm.voparis-cdpp/basecom/q/epn_coreParis Astronomical Data CentrePADChttp://voparis-srv-paris.obspm.fr/logos/PADC_small.png2021-04-30T17:52:24Jacques CrovisierObservatoire de Paris/PADC, 61 avenue de l’Observatoire, F-75014 PARISvo.paris@obspm.frspectroscopycomet Since 1973, the 18-cm lines of the OH radical have been
systematically observed in a number of comets with the Nançay radio
telescope. This allowed an evaluation of the cometary water production
rates and their evolution with time, as well as a study of several
physical processes: the excitation mechanisms of the OH radio lines,
the expansion of the cometary atmospheres, their anisotropy in
relation with non-gravitational forces, the Zeeman effect in relation
with the cometary magnetic field. The Nançay observations of 53
cometary apparitions between 1982 and 2009 are now organized in this
database.http://voparis-cdpp.obspm.fr/tableinfo/basecom.epn_coreCatalogGeneralUniversityResearchNancayGrand radiotelescopeRadioMillimeterbasecomThe Nançay Cometary Database Since 1973, the 18-cm lines of the OH radical have been
systematically observed in a number of comets with the Nançay radio
telescope. This allowed an evaluation of the cometary water production
rates and their evolution with time, as well as a study of several
physical processes: the excitation mechanisms of the OH radio lines,
the expansion of the cometary atmospheres, their anisotropy in
relation with non-gravitational forces, the Zeeman effect in relation
with the cometary magnetic field. The Nançay observations of 53
cometary apparitions between 1982 and 2009 are now organized in this
database.
basecom.epn_core Since 1973, the 18-cm lines of the OH radical have been
systematically observed in a number of comets with the Nançay radio
telescope. This allowed an evaluation of the cometary water production
rates and their evolution with time, as well as a study of several
physical processes: the excitation mechanisms of the OH radio lines,
the expansion of the cometary atmospheres, their anisotropy in
relation with non-gravitational forces, the Zeeman effect in relation
with the cometary magnetic field. The Nançay observations of 53
cometary apparitions between 1982 and 2009 are now organized in this
database.ivo://vopdc.obspm/std/epncore#schema-2.0granule_uidInternal table row index Unique ID in data service, also in v2. Can be alphanumeric.meta.idcharindexedprimarygranule_gidCommon to granules of same type (e.g. same map projection, or geometry data products). Can be alphanumeric.meta.idcharobs_idAssociates granules derived from the same data (e.g. various representations/processing levels). Can be alphanumeric, may be the ID of original observation.meta.idchardataproduct_typeThe high-level organization of the data product, from enumerated list (e.g., 'im' for image, sp for spectrum)meta.code.classEpn.dataProductTypecharnullabletarget_nameStandard IAU name of target (from a list related to target class), case sensitivemeta.id;srcEpn.TargetNamecharnullabletarget_classType of target, from enumerated listmeta.code.class;srcEpn.TargetClasscharnullabletime_minAcquisition start time (in JD)dtime.startdoublenullabletime_maxAcquisition stop time (in JD)dtime.enddoublenullabletime_sampling_step_minSampling time for measurements of dynamical phenomena, lower limit.stime.interval;stat.minEpn.Time.Time_sampling_step_mindoublenullabletime_sampling_step_maxSampling time for measurements of dynamical phenomena, upper limitstime.interval;stat.maxEpn.Time.Time_sampling_step_maxdoublenullabletime_exp_minIntegration time of the measurement, lower limit.stime.duration;obs.exposure;stat.minEpn.Time.Time_exp_mindoublenullabletime_exp_maxIntegration time of the measurement, upper limitstime.duration;obs.exposure;stat.maxEpn.Time.Time_exp_maxdoublenullablespectral_range_minSpectral range (frequency), lower limit.Hzem.freq;stat.minEpn.Spectral.Spectral_range_mindoublenullablespectral_range_maxSpectral range (frequency), upper limitHzem.freq;stat.maxEpn.Spectral.Spectral_range_maxdoublenullablespectral_sampling_step_minspectral sampling step, lower limit.Hzem.freq.step;stat.minEpn.Spectral.Spectral_sampling_step_mindoublenullablespectral_sampling_step_maxspectral sampling step, upper limitHzem.freq.step;stat.maxEpn.Spectral.Spectral_sampling_step_maxdoublenullablespectral_resolution_minSectral resolution, lower limit.Hzspect.resolution;stat.minEpn.Spectral.Spectral_resolution_mindoublenullablespectral_resolution_maxSectral resolution, upper limitHzspect.resolution;stat.maxEpn.Spectral.Spectral_resolution_maxdoublenullablec1minRight Ascension (ICRS), lower limit.degpos.eq.ra;stat.minEpn.Spatial.Spatial_range.c1mindoublenullablec1maxRight Ascension (ICRS), upper limitdegpos.eq.ra;stat.maxEpn.Spatial.Spatial_range.c1maxdoublenullablec2minDeclination (ICRS), lower limit.degpos.eq.dec;stat.minEpn.Spatial.Spatial_range.c2mindoublenullablec2maxDeclination (ICRS), upper limitdegpos.eq.dec;stat.maxEpn.Spatial.Spatial_range.c2maxdoublenullablec3minDistance from coordiate origin, lower limit.mphys.distance;stat.minEpn.Spatial.Spatial_range.c3mindoublenullablec3maxDistance from coordiate origin, upper limitmphys.distance;stat.maxEpn.Spatial.Spatial_range.c3maxdoublenullables_regionObsCore-like footprint, valid for celestial, spherical, or body-fixed frames.phys.outline;obs.fieldcharnullablec1_resol_minResolution in the first coordinate, lower limit.degpos.resolution;stat.minEpn.Spatial.Spatial_resolution.c1_resol_mindoublenullablec1_resol_maxResolution in the first coordinate, upper limitdegpos.resolution;stat.maxEpn.Spatial.Spatial_resolution.c1_resol_maxdoublenullablec2_resol_minResolution in the second coordinate, lower limit.degpos.resolution;stat.minEpn.Spatial.Spatial_resolution.c2_resol_mindoublenullablec2_resol_maxResolution in the second coordinate, upper limitdegpos.resolution;stat.maxEpn.Spatial.Spatial_resolution.c2_resol_maxdoublenullablec3_resol_minResolution in the third coordinate, lower limit.mpos.resolution;stat.minEpn.Spatial.Spatial_resolution.c3_resol_mindoublenullablec3_resol_maxResolution in the third coordinate, upper limitmpos.resolution;stat.maxEpn.Spatial.Spatial_resolution.c3_resol_maxdoublenullablespatial_frame_typeFlavor of coordinate system, defines the nature of coordinates. From enumerated listmeta.code.class;pos.framecharnullableincidence_minIncidence angle (solar zenithal angle) during data acquisition, lower limit.degpos.posAng;stat.minEpn.View_angle.Incidence_angle_mindoublenullableincidence_maxIncidence angle (solar zenithal angle) during data acquisition, upper limitdegpos.posAng;stat.maxEpn.View_angle.Incidence_angle_maxdoublenullableemergence_minEmergence angle during data acquisition, lower limit.degpos.posAng;stat.minEpn.View_angle.Emergence_angle_mindoublenullableemergence_maxEmergence angle during data acquisition, upper limitdegpos.posAng;stat.maxEpn.View_angle.Emergence_angle_maxdoublenullablephase_minPhase angle during data acquisition, lower limit.degpos.phaseAng;stat.minEpn.View_angle.Phase_angle_mindoublenullablephase_maxPhase angle during data acquisition, upper limitdegpos.phaseAng;stat.maxEpn.View_angle.Phase_angle_maxdoublenullableinstrument_host_nameStandard name of the observatory or spacecraft.meta.id;instr.obstyProvenance.ObsConfig.Facility.namecharnullableinstrument_nameStandard name of instrumentmeta.id;instrProvenance.ObsConfig.Instrument.namecharnullablemeasurement_typeUCD(s) defining the data, with multiple entries separated by hash (#) characters.meta.ucdEpn.Measurement_typecharnullableprocessing_levelCODMAC calibration level; see the et_cal note http://dc.g-vo.org/tableinfo/titan.epn_core#note-et_cal for what values are defined here.meta.code;obs.calibintcreation_dateDate of first entry of this granuletime.creationcharnullablemodification_dateDate of last modification (used to handle mirroring)time.updatecharnullablerelease_dateStart of public access periodtime.releasecharnullableservice_titleTitle of resource (an acronym really, will be used to handle multiservice results)meta.titlecharnullableaccess_urlURL of the data file, case sensitive. Can point to a script.meta.ref.url;meta.fileObs.Access.Referencecharnullableaccess_formatFile format type (RFC 6838 Media Type a.k.a MIME type)meta.code.mimeObs.Access.Formatcharnullableaccess_estsizeEstimated file size in kbyte.kbytephys.size;meta.fileObs.Access.Sizeintnullableaccess_md5MD5 Hash for the filemeta.checksum;meta.filecharnullabletime_scaleAlways UTC in data services (may be relaxed in computational services such as ephemeris) - from enumerated listtime.scalecharnullablepublisherA short string identifying the entity running the data service used.meta.refcharnullablebib_referenceBibcode preferred if available (does that include link?), doi, or other biblio id, URLmeta.bibcharnullablethumbnail_urlURL of a thumbnail image with predefined size (png ~200 pix, for use in a client only).meta.ref.url;meta.filecharnullabletarget_regionType of region of interestmeta.id;classcharnullablespeciesIdentifies a chemical species, case sensitivemeta.id;phys.atmolcharnullablealt_target_nameProvides alternative target name if more common (e.g. comets)meta.id;srccharnullablefile_nameName of the data file only, case sensitive.meta.id;meta.filecharnullableexternal_linkLink to a web page providing more details on the granulemeta.ref.urlcharnullabletperihelionDate of perihelion, UTCtime.epochcharnullabledsun0Sun Distance at Perihelionaupos.distance;pos.heliocentricdoublenullablecomet_typeType of cometmeta.code.classcharnullableobsqualObservation quality: marginal/clearmeta.code.qualcharnullablestatusmeta.code.statusintfreqFrequencyHzem.freqdoublenullablepolarPolarisationphys.polarization.circularcharnullablesun_distance_minMin target heliocentric distance in auaupos.distance;stat.mindoublenullablesun_distance_maxMax target heliocentric distance in auaupos.distance;stat.maxdoublenullableearth_distance_minMin target-Earth distance in auaupos.distance;stat.mindoublenullableearth_distance_maxMax target-Earth distance in auaupos.distance;stat.maxdoublenullablerdotHeliocentric radial velocitykm/sphys.veloc.orbital;pos.heliocentricdoublenullableinv1OH maser inversion 1arithdoublenullableinv2OH maser inversion 2arithdoublenullabletbgBackground brightness temperatureKinstr.skyTempdoublenullableline_areaLine areamJy.km/sphys.area;spect.linedoublenullableline_area_errorLine area errormJy.km/sphys.area;spect.line;stat.errordoublenullableline_strengthLine maximum intensitymJyspect.line.strengthdoublenullableline_strength_errorLine maximum intensity errormJyspect.line.strength;stat.errordoublenullablev0Line central velocitykm/sspect.dopplerVelocdoublenullablev0_errorLine central velocity errorkm/sspect.dopplerVeloc;stat.errordoublenullabledv0Line FWHMkm/sspect.line.widthdoublenullabledv0_errorLine FWHM errorkm/sspect.line.width;stat.errordoublenullableq1ohOH production rate 1 (unit=10**28/s)arith.rate;phys.mass.lossdoublenullableq1_errorOH production rate 1 error (unit=10**28/s)arith.rate;phys.mass.loss;stat.errordoublenullableq2ohOH production rate 2 (unit=10**28/s)arith.rate;phys.mass.lossdoublenullableq2_errorOH production rate 2 error (unit=10**28/s)arith.rate;phys.mass.loss;stat.errordoublenullableradegpos.eq.radoublenullableoffraRA Offset from targetdegpos.eq.ra;arith.diffdoublenullabledecdegpos.eq.decdoublenullableoffdecDec Offset from targetdegpos.eq.dec;arith.diffdoublenullableds_idHousekeeping info for datalink servicesmeta.idcharnullabledatalink_urlPositional ephemeris via datalinkmeta.ref.url;meta.datalinkcharnullable