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Column Name
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Description
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Supported in Catalogs
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Object
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Catalog and star designation.
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All
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Common Name
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Commonly used name by which the object is known. You may see the list of all common names by which the object is known by right-clicking the object and viewing the context menu.
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All
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Cross Ref
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cross reference to other catalogs in the database. You may see the list of all cross references by which the object is known by right-clicking the object and viewing the context menu.
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All
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Con
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Constellation in which the object is located
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All
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RA / Decl
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Astrometric position, precessed to epoch and mean equinox of J2000.0.
When RA format is Hours, Minutes, Seconds, the accuracy of seconds is adjusted to the original catalog's precision. The same is true for Declination when the format is Degrees, Minutes, Seconds.
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All
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RA PM / Decl PM
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Proper motion in RA and Declination in milliarcseconds per year. The accuracy of these values is adjusted to the original catalog's precision.
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CCDM, Hip, SAO, WDS
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Mag
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Magnitude and code identifying the photometric system used to derive the magnitude value. The accuracy of magnitude is adjusted to the original catalog's accuracy. V magnitudes are supplied if available.
Magnitude codes:
▪B: Johnson B filter (blue)
▪I: Johnson I filter (infrared)
▪Ic: Cousins I filter (infrared)
▪J: (near infrared)
▪H: (near infrared)
▪K: (near infrared)
▪L: (near infrared)
▪M: (mid infrared)
▪p: photographic
▪R: Johnson R filter (red)
▪Rc: Cousins R filter (red)
▪U: Johnson U filter (ultraviolet)
▪V: Johnson V filter (visual)
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All
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Brt Mag / Dim Mag
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Magnitudes of variable stars, including the photometric system used if available. The accuracy of magnitude is adjusted to the original catalog's accuracy.
Special notes for GCVS & NSV: Several stars from the 68th Name-List have in these positions "1." designating the 1.04 {mu}m band of the system introduced by G.W.Lockwood. The designations u,v,b,y refer to the Stroemgren system. The symbols "Ic" and "Rc" mean magnitudes in Cousins' I system. "g" designates magnitudes in the system of Thuan and Gunn; "T" stands for broad-band Tycho magnitudes formed from B and V measurements; "r" are red magnitudes not tied to a particular system. An asterisk in the corresponding position means a measurement in white light.
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GCVS, NSV
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Mag A / Mag B
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Magnitudes of the Primary and Secondary components, including the photometric system used if available.
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WDS
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Mag Diff
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Absolute value of the magnitude difference between the Primary and Secondary components of a double star or bright and dim magnitudes of a variable star.
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I/R Mag
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Infrared magnitude, including photometric system used if available.
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CGCS
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B-V
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B-V is a measure of the color of stars and galaxies. Larger values indicate reddening while smaller values indicate a stronger blue color.
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CGCS, Hip, SAO
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Spec
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Abbreviated Morgan-Keenan spectral type.
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CCDM, CGCS, GCVS, Hip, NSV, SAO
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SpecA
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Abbreviated Morgan-Keenan spectral type of the A component.
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WDS
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Full Spec
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Full Morgan-Keenan spectral type information from the catalog.
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CGCS, GCVS, Hip, NSV, SAO, WDS.
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Var Type
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Variable star type.
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GCVS, NSV
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Epoch
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epoch of observed values expressed as Julian date. Epoch defines a starting point in the light variation cycle of the star, either a minimum or maximum as appropriate for the variable star type.
Light variation cycles begin at time of minimum light for eclipsing and ellipsoidal variables. All other types begin at time of maximum light.
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GCVS
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Var Period
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period of a single light variation cycle in days.
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GCVS
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Duration
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Duration in days, hours, minutes, seconds of the eclipse for eclipsing variables or the rise time for intrinsic variables.
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GCVS
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Next Extremum
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The date and time of the beginning of the next light variation cycle. This is time of minimum light, indicated by (min), or maximum light indicated by (max). The date and time are expressed in either local or universal time as determined in preferences.
Light variation cycles begin at time of minimum light for eclipsing and ellipsoidal variables. All other types begin at time of maximum light.
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GCVS
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PA
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position angle at time of observation. If orbital elements are available for a double star, PA is calculated for the Ephemeris date and time.
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CCDM, WDS
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Sep
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separation angle at time of observation. If orbital elements are available for a double star, Sep is calculated for the Ephemeris date and time. Sep is displayed to higher precision than a cataloged value.
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CCDM, WDS
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Year
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year of observation. If orbital elements are available for a double star, PA and Separation are calculated for the Ephemeris date and time.Year is displayed to higher precision and matches the ephemeris date and time.
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CCDM, WDS
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Grade
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grade describes the quality of the orbital elements used to calculate PA and Separation of a double star. Grades are (from highest quality to lowest):
Definitive, Good, Reliable, Preliminary, Indeterminate, Interferometric, Astrometric.
Interferometric means measurements are missing in the WDS catalog so measurements are derived from interferometric studies of the positions of the 2 stars. Interferometric implies high quality elements.
Astrometric means measurements are missing in the WDS catalog so measurements are derived from astrometric calculations of the positions of the 2 stars. Astrometric implies poor quality elements
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WDS
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Alt
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Apparent altitude at the ephemeris date and time. The angle is formatted as specified in Preferences.
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All
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Az
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Apparent azimuth at the ephemeris date and time. The angle is formatted as specified in Preferences.
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All
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LHA
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Local hour angle at the ephemeris date and time. The angle is formatted as hours and minutes East or West of the meridian.
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All
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SA2000
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Chart number on which the object appears in Sky Atlas 2000.0
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All
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U2000
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Volume and page number on which the object appears in Uranometria 2000.0. Note that there is some overlap in the two volumes, but the page number is valid for either volume
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All
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MSA
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Volume and page number on which the object appears in Millennium Star Atlas
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All
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HB
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Chart series (B & C) and page number on which the object appears in Herald-Bobroff AstroAtlas.
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All
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U2000.2
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Volume and page number on which the object appears in Uranometria 2000.0 2d Ed. Note that there is some overlap in the two volumes, but the page number is valid for either volume
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All
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PSA
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Chart number on which the object appears in Pocket Sky Atlas.
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All
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IDSA
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Chart number on which the object appears in interstellarum Deep Sky Atlas.
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All
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Rise(Az), Set(Az)
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Time of rise, set, and apparent azimuth at rise and set time for your location. If your location has a local horizon model defined for it and the model is applied to the ephemeris calculation, rise & set times are the approximate times at which an object rises above and sets beneath the local horizon model. The data are formatted as specified in Preferences.
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All
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Transit(Alt)
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Time of transit and apparent altitude at transit. The data are formatted as specified in Preferences.
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All
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Best(Alt)
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Best time to view and apparent altitude at best time. The data are formatted as specified in Preferences.
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All
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Vis Pred
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Predicted visibility of the star computed by the star visibility models. Please see visibility modeling for possible values for different types of stars.
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All
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Observed
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Whether or not present in the observing log
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All
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