ChandraOUP ivo://nasa.heasarc/coup NASA/GSFC HEASARC Getman et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The Chandra Orion Ultradeep Project (COUP) was a deep observation of the Orion Nebula Cluster (ONC) that was obtained with the Chandra X-Ray Observatory's Advanced CCD Imaging Spectrometer (ACIS). This Browse table contains the COUP catalog of more than 1600 X-ray point sources that were detected in the exceptionally deep 2003 January observation, which was an 838 ks exposure made over a continuous period of 13.2 days. The COUP observation provides the most uniform and comprehensive data set on the X-ray emission of normal stars ever obtained in the history of X-ray astronomy. This table was created by the HEASARC in September 2006 based on the <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/160/319">CDS catalog J/ApJS/160/319</a>, tables 2, 4, 6, 7, 8, 9, and 10. This is a service provided by NASA HEASARC . 2005ApJS..160..319G https://heasarc.gsfc.nasa.gov/W3Browse/all/coup.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=coup& GET text/xml 180 99999 true 83.814596 -5.586538 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=coup GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_coup&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 Infrared Optical X-ray public coup Chandra Orion Ultradeep Point Source Catalog name Source Designation (COUP JHHMMSS.s+DDMMSS in SIMBAD) meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable counts Net Counts in Extracted Area ct phot;em.X-ray int nullable photon_flux The 0.5-8.0keV Incident Photon Flux (photon/cm^2/s) photon/cm^2/s double nullable vmag V Magnitude mag phot.mag;em.opt.V double nullable spect_type Spectral Type src.spType char nullable temperature_1 Energy of First Plasma Component (keV) keV double nullable log_nh Log of Hydrogen Column Density in cm^-2 log(cm^-2) double nullable a_vmag Visual Absorption of the Optical Counterpart mag double nullable temperature_2_error Error in Energy of Second Plasma Component (keV) keV double nullable median_photon_energy Median Energy Corrected for Background keV double nullable detect_flag_1 Flag Indicating Source Detection Method for Chicago Wavdetect short nullable log_lx_soft Log of the Observed Soft Band (0.5-2.0keV) luminosity log(erg/s) double nullable error_radius 1-Sigma Positional Error (arcsec) arcsec stat.error;pos float nullable hr_3_neg_err Lower Uncertainty on HR3 double nullable pwdetect_flag Flag Indicating Source Detection Map for Palermo Wavelet Detection short nullable max_count_rate_error Bayesian Blocks, Error in Maximum Count Rate (ct/ks) ct/ks double nullable class Browse Object Classification src.class short nullable hr_1_pos_err Upper Uncertainty on HR1 double nullable chi_squared_dof Degrees of Freedom for Chi^2 short nullable hr_2 Hardness Ratio 2 (0.5-1.7/1.7-2.8keV) double nullable hr_1 Hardness Ratio 1 (0.5-2.0/2.0-8.0keV) double nullable spect_model_flags Spectral Model Flags char nullable hmag H Magnitude mag double nullable jmag J Magnitude mag double nullable vmag_range Range in V Magnitudes mag double nullable log_lx_hard_limit Upper Limit Flag for Log of the Observed Hard Band Luminosity char nullable hr_1_neg_err Lower Uncertainty on HR1 double nullable log_lx_hard_corr Log of the Estimated Luminosity in the Hard Band, Corrected for Absorption log(erg/s) double nullable optical_id_number Optical Star Designation char nullable hr_3 Hardness Ratio 3 (1.7-2.8/2.8-8.0keV) double nullable hrc_source_number Previous Chandra HRC X-Ray Source short nullable pwdetect_significance Source Significance in Sigma from Palermo Wavelet Detection sigma double nullable eq_width_ca_ii Equivalent Width Ca II Line (Angstrom) Angstrom double nullable ir_name JHK Source Designation char nullable wavdetect_flag Flag Indicating Source Detection Map for Chicago Wavdetect short nullable vmag_average Average V Magnitude mag double nullable temperature_1_error Error in Energy of First Plasma Component (keV) keV double nullable log_em_1_error Error in Log of Emission Measure of First Plasma Component in cm^-3 log(cm^-3) double nullable coup_number COUP Source Number short nullable ik_excess Delta I-K Near-Infrared Excess mag double nullable log_lx_hard Log of the Observed Hard Band (2.0-8.0keV) Luminosity log(erg/s) double nullable log_lx_soft_limit Upper Limit Flag for Log of the Observed Soft Band Luminosity char nullable acis_source_number Previous Chandra ACIS X-Ray Source short nullable xray_ir_offset COUP-JHK Source Positional Offset (arcsec) arcsec double nullable reduced_chi_squared Chi-Squared per Degree of Freedom for Spectral Fit double nullable temperature_2 Energy of Second Plasma Component, If Needed (keV) keV double nullable off_axis Off-Axis Angle (arcmin) arcmin instr.offset double nullable log_l_bol Log of the Stellar Bolometric Luminosity in Units of Solar Luminosity log(Solar_Luminosity) double nullable psf_fraction Point Spread Fraction in Extracted Area at Fiducial Energy 1.5keV double nullable max_count_rate Bayesian Blocks, Maximum Count Rate (ct/ks) ct/ks double nullable log_stellar_age Log of Stellar Age log(yr) double nullable stellar_radius Stellar Radius in Units of the Solar Radius Solar_Radius double nullable extraction_area Extraction Area (pixels) pixel short nullable ref_ir_photometry Reference Code for Photometry char nullable log_nh_error Error in Log of Hydrogen Column Density in cm^-2 log(cm^-2) double nullable lmag L Magnitude mag double nullable min_count_rate Bayesian Blocks, Minimum Count Rate (ct/ks) ct/ks double nullable detect_flag_2 Flag Indicating Source Detection Method for Palermo Wavelet Detection short nullable lii Galactic Longitude degree pos.galactic.lon double nullable lmag_flag Reference Code for L Magnitude char nullable flux_conv_factor Conversion Factor between Counts and Flux in Units of 10^9 ct.s.cm^2/photon 10^9_ct_s_cm^2/photon double nullable quality_flag_2mass 2MASS Photometric Quality Flag char nullable rotation_period Photometric Rotational Period (d) d double nullable stellar_mass Stellar Mass in Units of the Solar Mass Solar_Mass double nullable bii Galactic Latitude degree pos.galactic.lat double nullable total_counts Source Counts in Extracted Area ct int nullable ae_significance Source Significance in Sigma from acis_extract sigma double nullable log_em_2_error Error in Log of Emission Measure of Second Plasma Component in cm^-3 log(cm^-3) double nullable hr_2_pos_err Upper Uncertainty on HR2 double nullable contcon_flag_2mass 2MASS Contamination and Confusion Flag char nullable gap_flag Flag Indicates Sources Were Located on an ACIS CCD Chip Gap char nullable imag I Magnitude mag phot.mag;em.opt.I double nullable hr_3_pos_err Upper Uncertainty on HR3 double nullable hr_2_neg_err Lower Uncertainty on HR2 double nullable log_em_2 Log of Emission Measure of Second Plasma Component in cm^-3 log(cm^-3) double nullable log_em_1 Log of Emission Measure of First Plasma Component in cm^-3 log(cm^-3) double nullable log_prob_var Log of Probability of Variability double nullable bck_counts Background Counts in Extracted Area ct short nullable xray_opt_offset COUP-Optical Positional Offset (arcsec) arcsec double nullable problem_flags Flag Indicating Source Detection Problem char nullable detect_flag_3 Flag Indicating Source Detection Group(s) short nullable ks_mag K_s Magnitude mag double nullable log_lx_tot Log of the Observed Total Band (0.5-8.0keV) Luminosity log(erg/s) double nullable exposure Exposure Time (s) s time.duration;obs.exposure double nullable log_t_eff Log of the Stellar Effective Temperature (K) log(K) double nullable min_count_rate_error Bayesian Blocks, Error in Minimum Count Rate (ct/ks) ct/ks double nullable fit_quality_flag Spectral Fit Flag char nullable vmag_average_error Error in Average V Magnitude mag double nullable fit_comment_flags Spectral Features and Problems Flag char nullable lmag_id_number L-band Source Designation char nullable log_lx_tot_corr Log of the Estimated Luminosity in the Total Band, Corrected for Absorption log(erg/s) double nullable num_bb_segments Bayesian Blocks, Number of Segments short nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable