Guide to NED Catalog Search Results

(Latest Revision: 8 May 2009)

This page displays the original data from various catalogs. While we have corrected known errors in these data, we have made no attempt to systematically check every entry in the catalogs. Thus, the data displayed here may not agree with NED's basic data for the same object, particularly if the basic data are taken from another catalog.

The data in each catalog currently in NED (UGC, ESO, PKS, RC3, and HB89) are described briefly below. The printed versions of each catalog contain full descriptions of each of the data fields.


UGC

Uppsala General Catalogue of Galaxies
by Peter Nilson
Royal Society of Sciences of Uppsala, 1973
The version of UGC displayed here has had known errors corrected.
  • NAME: UGC number
  • RA and DEC: Equatorial coordinates for equinox 1950.0, in sexagesimal notation.
  • MCG_NAME: Number in MCG, or MCG field number if the galaxy is not listed in MCG.
  • POSS#: Palomar Observatory Sky Survey plate number on which the object is most easily seen.
  • BLUE_SIZE and RED_SIZE: Diameters in arcmin measured on the blue POSS prints (first line) and the red POSS prints (second line).
  • PA and INCL: Position angle in degrees measured from north through east; and estimated inclination to the line of sight on a scale from 1 (face-on) to 7 (edge-on).
  • MORPH: Galaxy type or comments, extracted from more extensive information in UGC.
  • MAG: Photographic blue magnitude, taken from CGCG where possible, otherwise estimated from blue POSS print.
  • RADVEL: Heliocentric radial velocity, usually from RC1, but also from other sources available before 1973.
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    ESO

    The ESO/Uppsala Survey of the ESO(B) Atlas
    by Andris Lauberts
    European Southern Observatory, 1982
  • RA and DEC: Equatorial coordinates for equinox 1950.0, in sexagesimal notation.
  • ESO_NAME: Designation in the form "FFF-tt nnn", where FFF is the Southern Sky Survey field number, tt is the type of object (G = galaxy, IG = interacting galaxy), and nnn is a serial number within the given sky survey field.
  • IDENTIFICATION: Other names including NGC/IC, MCG, etc.
  • GLON and GLAT: Galactic coordinates in decimal degrees.
  • X, Y: Rectangular coordinates in the Southern Sky Survey fields, measured in mm from the center of the plate (as defined by the fiducial crosses at each edge of each field).
  • MAJ and MIN: Measured diameters for the major and minor axes in arcminutes.
  • PA: Position angle in degrees, measured from north through east.
  • MORPH: Numerically-coded Hubble stage, using the RC2 coding scheme.
  • CLASSIFICATION: Hubble-Holmberg galaxy type in standard notation.
  • DESCRIPTION: Notes, comments, and numerically coded references to other catalogs.
  • BMAG and M.E.: Total B-magnitude when mean error <1, B-magnitude at aperture in arcseconds when mean error >1; in the second case, the aperture in arcseconds is given in the mean error column.
  • BREF and B-VREF: Numerically coded references for magnitudes and colors.
  • B-V and U-B: Color indices taken from the reference noted in the previous column.
  • RADVEL and M.E.: Heliocentric radial velocities and mean errors.
  • VEL_REF: Numerically coded reference for the radial velocity.
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    Parkes

    PKSCAT90, The Southern RadioSource Database
    by A. E. Wright and R. E. Otrupcek
    Australia Telescope National Facility, CSIRO, 1990
  • B1950_NAME, J2000_NAME, and ALIAS: Original Parkes source names constructed from the B1950.0 position are given in the format BHHMM-DDd; a name constructed from the J2000.0 position is given in the format JHHMM-DDMM. Other catalog names are listed in the Alias column.
  • RA and DEC: Equatorial coordinates are listed for B1950.0 and J2000.0. Positional accuracy, given in arcsec in the Error column, is read as "better than."
  • ID: This is the physical type of the object (e.g. G for galaxy, BLC for BL Lac object, Q for confirmed QSO, etc.) or a "blank field" type (e.g. Xg for one or more galaxies in the area, but no identification claimed, Xs for one or more stars of normal color in the area, etc.).
  • MAG and Z: Magnitude and redshift for optically identified objects. The redshift is sometimes replaced by the year and month (in the format YY.MM) in which an inconclusive optical spectrum was obtained.
  • IDENT_REF and REDSHIFT_REF: Coded references for the identification and redshift.
  • FLUX DENSITIES: Flux densities in Jy are given at various frequencies in MHz.
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    RC3

    Third Reference Catalogue of Bright Galaxies
    by G. de Vaucouleurs, A. de Vaucouleurs, H. G. Corwin, R. J. Buta, G. Paturel, and P. Fouqué
    Springer-Verlag New York, 1991

    The version of RC3 displayed here is RC3.9b, dated 15 July 1993, with eight additional duplicate objects removed, March 1994. See AJ 108, 2128, 1994 for details on the corrections.

    • Positions
    • RA and DEC for equinox 2000.0 in sexagesimal notation.
    • l, b: Galactic longitude and latitude in decimal degrees.
    • SGL, SGB: Supergalactic longitude and latitude in decimal degrees.
    • RA and DEC for equinox 1950.0 in sexagesimal notation.
    • Names
    • NGC, IC, A: Designation from RC2, or common name.
    • UGC, ESO, or MCG: Catalog name in that order of preference.
    • Other names: (e.g. IRAS, VCC, DDO, Markarian, etc.).
    • PGC: Number in the Catalogue of Principal Galaxies.
    • Types
    • Type: Coded revised Hubble type.
    • S_T_ and n_L_: Sources of the revised Hubble type, and number of van den Bergh luminosity class estimates.
    • T: Mean numerical Hubble stage and its mean error.
    • L: Mean numerical van den Bergh luminosity class and its mean error.
    • Diameters
    • logD_25_: log of major axis (in 0.1 arcmin units) at the 25.0 B-mag/sq arcsec isophote, and mean error.
    • logR_25_: log of axis ratio (major axis/minor axis), and mean error.
    • logA_e_: log of effective aperture (in 0.1 arcmin units) containing half the galaxy's light, and mean error.
    • logD_0_: log of face-on diameter (in 0.1 arcmin units) corrected for inclination, redshift, and Galactic absorption.
    • Position Angle and Absorption
    • PA: Position angle in degrees, measured from north through east.
    • A_g_: Galactic absorption in B magnitudes, from the Burstein-Heiles formulation, or from individual studies for a few low-latitude objects.
    • A_i_: Internal absorption in B magnitudes.
    • A_21_: Neutral hydrogen self-absorption in magnitudes.
    • Magnitudes
    • B_T_: Total B magnitude followed by
    • [blank] if from photoelectric aperture photometry,
    • S if from surface photometry,
    • M if mean of photoelectric and surface photometry,
    • V if magnitude is V-band rather than B-band,
    • v if nucleus is variable,
    • * if insufficient photometry to derive total magnitude, and mean error.
    • m_B_: Total photographic magnitude, reduced to the B system, from CGCG, ESO-LV, Shapley-Ames, and other sources; and mean error.
    • m_FIR_: Far infrared magnitude m_FIR_ = -20.0 - 2.5 log(FIR), where FIR is from IRAS 60- and 100-micron flux densities.
    • B_T_^0^: Total B magnitude, corrected for Galactic and internal absorption, and redshift.
    • Total Colors
    • (B-V)_T_: Total B-V color index and mean error.
    • (U-B)_T_: Total U-B color index and mean error.
    • (B-V)_T_^0^: Total B-V color index corrected for Galactic and internal absorption, and for redshift.
    • (U-B)_T_^0^: Total corrected U-B color index.
    • Effective Colors and Surface Brightnesses
    • (B-V)_e_: B-V color index within A_e_, and mean error.
    • (U-B)_e_: U-B color index within A_e_, and mean error.
    • m'_e_: Mean B-mag surface brightness within A_e_.
    • m'_25_: Mean B-mag surface brightness within the ellipse defined by D_25_ and R_25_.
    • Neutral Hydrogen Data
    • m_21_: 21-cm emission line magnitude m_21_ = 21.6 - 2.5 log(S_H_), where S_H_ is the neutral hydrogen flux density in units of 10^-24^ W m^-2^; and mean error.
    • W_20_: 21-cm emission line full width at the 20% level in km/s, and mean error.
    • W_50_: 21-cm emission line full width at the 50% level in km/s, and mean error.
    • H.I.: Corrected neutral hydrogen index H.I. = m_21_^0^ - B_T_^0^.
    • Radial Velocities
    • V_21_: Mean heliocentric neutral hydrogen velocity (V = cz) in km/s, and mean error.
    • V_opt_: Mean heliocentric optical velocity and mean error.
    • V_GSR_: Weighted mean of neutral hydrogen and optical velocities, reduced to the "Galactic standard of rest."
    • V_3K_: Weighted mean of neutral hydrogen and optical velocities, reduced to the reference frame of the 3K background radiation.

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    H&B 1989 QSO

    A New Optical Catalog of Quasi-Stellar Objects
    by A. Hewitt and G.Burbidge
    ApJS, 63, 1, 1987 and ApJS, 69, 1, 1989.

    The version displayed includes the additions and corrections published in 1989.

  • [HB89]: Designation constructed from the 1950 coordinates; and the detection technique. BL Lac objects are noted as such.
  • OTHER_NAMES: Other popular names for the object; the first listed is the name under which the object was first identified.
  • RA and DEC: Optical equatorial coordinates for equinox B1950.0 in sexagesimal notation.
  • V, (B-V), and (U-B): Apparent V magnitude followed by an asterisk if the object is variable. Many entries are m_pg_, B, or estimates from the Sky Surveys. B-V and U-B colors are given when known.
  • Z(EM): Emission line redshift, followed by
    • a plus sign if absorption has been seen but not measured,
    • an asterisk if absorption redshifts are known.
    Uncertain redshifts are enclosed in parentheses.
  • EM_LINES: Emission lines on which the redshift is based.
  • Z(ABS): Absorption redshift(s) if known.
  • REFERENCES: Numerically coded references to
    • ID: Identification and/or finding charts,
    • Z: Emission redshift,
    • V: Variability,
    • R: Radio,
    • A: Absorption lines.
  • NOTES: Coded references with more information on the object.
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