SKY2000 - Master Star Catalog :  
        This the new name for the
        "SKYMAP Star Catalog" by Myers J.R.,Goddard
        Space Flight Center, Flight Dynamics Division. It as
        nothing to do whit the Sky Catalog 2000 from Sky
        Publishing.  
         
         
         
        Tycho Catalog :  
        Be careful when using this
        data for astrometric purpose, the proper motion error are
        sometime large.  
         
         
         
        Tycho Input Catalog :  
        This catalog is normally
        obsolete as its main purpose is Tycho data reduction. But
        from an amateur point of view it may be considered as a
        subset of the GSC up to magnitude 12. It remain very
        interesting for its compact size, homogenous limiting
        magnitude and color indication in some fields.  
         
         
         
        The HST Guide Star Catalog :  
        Magnitude band
        definition :  
           
        band      emulsion/filter  
           
        ----     
        ------------------------------------  
            
        0        S  -
        IIIaJ + GG395  
            
        1        N  -
        IIaD  + W12  
            
        6        N  -
        IIaD  + GG495
         
            
        8        XE - 103aE +
        Red Plexiglass  
           
        10*       XG - yellow
        objective + IIaD + GG495  
           
        11        XB - blue
        objective +103aO  
           
        12*       XB - blue
        objective +103aO  
           
        13        XB - yellow
        objective + 103aG + GG495  
           
        14*       XB - yellow
        objective + 103aG + GG495  
           
        18        XN - IIIaJ +
        GG385  
                     
        * Calibrated with the GSC.  
        Object class
        definition :  
        cl object  
        -- ----------  
        0 star  
        1 galaxy  
        2 groupe of stars  
        3 non-stellar  
        5 possible
        artefact  
         
         
         
        USNO-A :  
        Calibration catalog
        :   
        A1.0 and SA1.0 : GSC  
        A2.0 and SA2.0 : ACT  
        North-South limit is -30°
        for A1.0 and -20°/-18° for A2.0.  
        Stars colour do not represente b-v as other catalogues
        but (mb-mr)*0.6  
        Performance : The
        catalogue structure do not allow fast access to the data.
        Effectively, the index file (.acc) define zone of 7.5°
        in declination by 15' in right ascension, this is a very
        large area for the catalogue scale. Each zone contain up
        to 3'000'000 stars ( 10 time the SAO !) and can only
        accept sequential access. So be patient and prefere the
        GSC for navigation purpose then switch to USNO-A when you
        are satisfied by all other parameters.   
         
         
         
        General Catalog of Variable
        Stars :  
        Variability type : (
        look at file cat\gcvs.txt for complete description)  
               
        ACV       Alpha2 Canum
        Venaticorum  
               
        BCEP      Beta Cephei  
               
        BE        Be stars not
        GCAS  
               
        BL        BL Lacertae  
               
        BY        BY Draconis  
               
        CEP       cepheid  
               
        CST       constant  
               
        CW        W Virginis  
               
        DCEP      Delta Cephei  
               
        DSCT      Delta Scuti  
               
        E        
        eclipsing  
               
        EA        Algol (Beta
        Per)  
               
        EB        Beta Lyrae  
               
        EW        W Ursae
        Majoris  
               
        ELL       ellipsoidal  
               
        GCAS      Gamma Cassiopeiae  
               
        I        
        irregular  
               
        IA        white
        irregular  
               
        IN        irregular in
        a nebula  
               
        INS       rapid irregular
        in a nebula  
               
        INT       irregular of the
        T Tauri type  
               
        IS        rapid
        irregular  
               
        L         slow  
               
        LB        slow red  
               
        LBV       slow pulsating B
        stars  
               
        M         Mira
        (Omicron Ceti) type  
               
        N         nova  
               
        NL        nova-like  
               
        QSO       quasistellar
        object  
               
        R         close
        binary with strong reflection  
               
        RCB       R Coronae
        Borealis  
               
        RR        RR Lyrae  
               
        RRC       RR Lyrae, C
        subtype  
               
        RV        RV Tauri  
               
        S         rapid  
               
        SDOR      S Doradus  
               
        SR        semiregular  
               
        SN        supernova  
               
        UG        U Geminorum  
               
        UV        UV Ceti  
               
        UVN       UV Ceti in a
        nebula  
               
        ZAND      Z Andromedae  
               
        ZCAM      Z Camelopardalis  
               
        ZZC       ZZ Ceti  
         
         
         
        Washington Visual Double Star
        Catalog :  
          Notes :  
             
        N: Notes found in the Notes table.  
             
        O: Orbit. Where motion has exceeded 360 degrees, no  
                
        values are listed in the position angle and separation  
                
        columns. Orbits may be found in the "Fourth  
                
        Catalog of Orbits of Visual Binary Stars" (Worley  
                
        and Heintz, 1983), and in the Information Circulars  
                
        published by Commission 26 of the IAU, as well as  
               
        in the literature.
         
             
        a: Pair appears in an appendix list, not part of the  
                
        discoverer's regular numbering system.  
             
        r: Pair was listed, but in a "rejected" list,
        not part  
                
        of the discoverer's regular numbering sequence.  
             
        s: Pair has other discoverer's designations and numbers  
                
        in the literature due to duplicate discovery.  
                
        We have given credit to the earliest discovery  
                
        observation (and correct identification) reported  
                
        in the literature. The List of Synonyms follows the  
                
        List of Additional Discoverers.  
             
        p: Coordinates and proper motions from the ACRS, PPM,  
                
        IRS, and FK5 catalogs.  
         
         
         
        NGC :  
        Object classification
        :  
           
        Gx    Galaxy  
           
        OC    Open star cluster  
           
        Gb    Globular star cluster, usually in
        the Milky Way Galaxy  
           
        Nb    Bright emission or reflection nebula  
           
        Pl    Planetary nebula  
           
        C+N   Cluster associated with nebulosity  
           
        Ast   Asterism or group of a few stars  
           
        Kt    Knot  or  nebulous 
        region  in  an  external galaxy  
           
        ***   Triple star  
           
        D*    Double star  
           
        *     Single star  
           
        ?     Uncertain type or may not exist  
           
        blank Unidentified at the place given, or type unknown  
           
        -     Object called nonexistent in
        the RNGC (Sulentic and Tifft 1973)  
           
        PD    Photographic plate defect  
        Note on Desc:
        description of the object, as given by Dreyer or  
           
        corrected by him, in a coded or abbreviated form. The
        abbreviations  
           
        and their combination are fully described in the
        introduction  
           
        to the published catalog.  
           
        ab       about  
           
        alm      almost  
           
        am       among  
           
        annul    annular or ring nebula  
           
        att      attached  
           
        b        brighter  
           
        bet      between  
           
        biN      binuclear  
           
        bn       brightest to n
        side  
           
        bs       brightest to s
        side  
           
        bp       brightest to p
        side  
           
        bf       brightest to f
        side  
           
        B        bright  
           
        c        considerably  
           
        chev     chevelure  
           
        co       coarse, coarsely  
           
        com      cometic (cometary form)  
           
        comp     companion  
           
        conn     connected  
           
        cont     in contact  
           
        C        compressed  
           
        Cl       cluster  
           
        d        diameter  
           
        def      defined  
           
        dif      diffused  
           
        diffic   difficult  
           
        dist     distance, or distant  
           
        D        double  
           
        e        extremely,
        excessively  
           
        ee       most extremely  
           
        er       easily resolvable  
           
        exc      excentric  
           
        E        extended  
           
        f        following
        (eastward)  
           
        F        faint  
           
        g        gradually  
           
        glob.    globular  
           
        gr       group  
           
        i        irregular  
           
        iF       irregular figure  
           
        inv      involved, involving  
           
        l        little
        (adv.); long (adj.)  
           
        L        large  
           
        m        much  
           
        m        magnitude  
           
        M        middle, or in
        the middle  
           
        n        north  
           
        neb      nebula  
           
        nebs     nebulous  
           
        neby     nebulosity  
           
        nf       north following  
           
        np       north preceding  
           
        ns       north-south  
           
        nr       near  
           
        N        nucleus, or
        to a nucleus  
           
        p        preceding
        (westward)  
           
        pf      
        preceding-following  
           
        p        pretty (adv.,
        before F. B. L, S)
         
           
        pg       pretty gradually  
           
        pm       pretty much  
           
        ps       pretty suddenly  
           
        plan     planetary nebula (same as
        PN)  
           
        prob     probably  
           
        P        poor (sparse)
        in stars  
           
        PN       planetary nebula  
           
        r        resolvable
        (mottled, not resolved)  
           
        rr       partially
        resolved, some stars seen  
           
        rrr      well resolved, clearly
        consisting of stars  
           
        R        round  
           
        RR       exactly round  
           
        Ri       rich in stars  
           
        s        suddenly
        (abruptly)  
           
        s        south  
           
        sf       south following  
           
        sp       south preceding  
           
        sc       scattered  
           
        sev      several  
           
        st       stars (pl.)  
           
        st 9...  stars of 9th magnitude and fainter  
           
        st 9..13 stars of mag. 9 to 13  
           
        stell    stellar, pointlike  
           
        susp     suspected  
           
        S        small in
        angular size  
           
        S*       small (faint) star  
           
        trap     trapezium  
           
        triangle triangle, forms a triangle with  
           
        triN     trinuclear  
           
        v        very  
           
        vv       _very_  
           
        var      variable  
           
        *        a single star  
           
        *10      a star of 10th
        magnitude  
           
        *7-8     star of mag. 7 or 8  
           
        **       double star (same
        as D*)  
           
        ***      triple star  
           
        !        remarkable  
           
        !!       very much so  
           
        !!!      a magnificent or
        otherwise interesting object  
         
         
         
        Lynds' Catalogue of Bright
        Nebulae :  
        The following codes
        are used for Color:  
        '1' if brighter on
        blue Palomar plate;  
        '2' if equal on
        red and blue Palomar plates;  
        '3' if brighter on
        red Palomar plate;
         
        '4' if visible
        only on the red Palomar plate.  
        The brightness scale
        varies from 
         
        '1' (brightest) to  
        '6' (barely
        detectable).  
         
         
         
        Open Cluster Data 5th Edition :  
        Catalogues codes :  
            1
        NGC           
        2
        IC             
        3
        Berkeley         
        4 Czernik  
           
        5 Dolidze        6
        Collinder       7
        Upgren           
        8 Tombaugh  
           
        9 Ruprecht      10
        King          
        11 Stock  
           13
        Trumpler      14
        Markarian                         
        16 Haffner  
           17
        Hogg         
        18
        Sher          
        19 Feinstein        20
        Harvard  
           21
        Lynga         22
        Westerlund     23
        Basel           
        24 Blanco  
           25
        Baractova     26
        Biurakan       27
        Melotte         
        28 Pismis  
                           
        30
        Trapezium                         
        32 Pleiades  
           33
        Graff         34
        Iskudarian     35
        Stephenson       36 Roslund  
           37
        Hyades                         
        41 van den Bergh-Hagen  
                           
        42 Bochum        
        43 Dolidze-Dzimselejsvili  
           45
        Antalova      46
        Moffat         47
        Havlen-Moffat    48 Frolov  
                           
        50 van den Bergh  51
        Mayer           
        52 Latysev  
           53
        Sigma Ori     54
        Graham         55
        Aveni-Hunter     56 Loden  
           57
        Grasdalen     58
        Waterloo       59 Auner  
           61
        Schuster      62
        Danks         
        63
        Muzzio          
        64 =ref.378  
        Trumpler class :  
         Trumpler
        concentration class [0 1 2 3 4]  
         Trumpler
        Range class [0 1 2 3]  
         Trumpler
        Richness class [m p r]  
         Trumpler
        nebulosity [n u e]   
         
         
         
        Strasbourg-ESO Catalogue of
        Galactic Planetary Nebulae :  
        Hbeta magnitude =
        10-2.5(10+log(FluxHbeta))  
        Morphology indicator :  
          
        "<"  star-like appearance   
          
        ">"  fainter spherical envelope  
           else
        blank  
         
         
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