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.
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.
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The ESO/Uppsala Survey of the ESO(B) Atlas
by Andris Lauberts
European Southern Observatory, 1982
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PKSCAT90, The Southern RadioSource Database
by A. E. Wright and R. E. Otrupcek
Australia Telescope National Facility, CSIRO, 1990
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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
- Names
- Types
- Diameters
- Position Angle and Absorption
- Magnitudes
- 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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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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