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1998-03-18
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Extrait du SKY2000 - Master Star Catalog (Myers+ 1997)
Organisation du catalogue :
Les Θtoiles sont rΘparties dans 184 zones de 15x15 degrΘs selon le mΩme
principe que les grandes rΘgions du Guide Star Catalog .
( Voir Jenkner et al. The Astronomical Journal vol 99, num 6 June 1990 p.2087)
dΘclinaison nombre numΘro de la
du centre de zones premiΦre zone
------------- ------------ --------------
7.5 24 1
22.5 22 25
37.5 19 47
52.5 15 66
67.5 9 81
82.5 3 90
-7.5 24 93
-22.5 22 117
-37.5 19 139
-52.5 15 158
-67.5 9 173
-82.5 3 182
Chaque zone est matΘrialisΘe par un fichier .
Dans chaque fichier les Θtoiles sont triΘes par magnitude .
Description des enregistrements des fichiers :
SKYrec = record ar,de :longint ;
mv,b_v,d_m :smallint;
sep : word;
sp : array [1..3] of char;
dm_cat : array[1..2]of char;
dm : longint;
hd,sao :longint ;
end;
- ar : ascention droite J2000 en degrΘs * 100'000
- de : declinaison J2000 * 100'000
- mv : magnitude visuelle * 100
- b_v : indice de couleur B-V * 100
- d_m : diffΘrence de magnitude ( double ) * 100
- sep : separation en seconde ( double ) * 100
- sp : classe spectrale
- dm_cat: catalogue BD
- dm : numΘro BD
- hd : numΘro du catalogue HD
- sao : numΘro du catalogue SAO
Type Intervalle Format
------------ -------------------------- -------------------
Shortint -128 .. 127 SignΘ, 8 bits
SmallInt -32768 .. 32767 SignΘ, 16 bits
Longint -2147483648 .. 2147483647 SignΘ, 32 bits
Byte 0 .. 255 Non signΘ, 8 bits
Word 0 .. 65535 Non signΘ, 16 bits
Description originale du catalogue :
V/95 SKY2000 - Master Star Catalog (Myers+ 1997)
--------------------------------------------------------------------------------
SKY2000 - Master Star Catalog - Star Catalog Database
STAR CATALOG DATABASE
SKY2000 MASTER CATALOG SKYMAP SOFTWARE CAPABILITIES
Myers J.R., Sande C.B., Miller A.C., Warren Jr. W.H., Tracewell D.A.
<Goddard Space Flight Center, Flight Dynamics Division, 1997>
--------------------------------------------------------------------------------
ADC_Keywords: Astrometric data; Cross identifications; Combined data
Description:
The SKYMAP Star Catalog System consists of a Master Catalog stellar
database and a collection of utility software designed to create and
maintain the database and to generate derivative mission star catalogs
(run catalogs). It contains an extensive compilation of information on
almost 300000 stars brighter than 8.0 mag.
Introduction:
The original SKYMAP Master Catalog was generated in the early 1970's.
Incremental updates and corrections were made over the following years
but the first complete revision of the source data occurred with Version
4.0. This revision also produced a unique, consolidated source of
astrometric information which can be used by the astronomical community.
The derived quantities were removed and wideband and photometric data in
the R (red) and I (infrared) systems were added. This version, the most
recent, is discussed in detail in sky.txt.
Confer.txt describes these upgrades in detail. There are some
deficiencies that exist in the SKY2000 Master Catalog that we are aware
of. These items will be researched and corrected in future SKY2000
Master Catalog releases. (See deficient.txt).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
sky0.dat 463 10236 Data for stars in RA < 1 hour
sky1.dat 463 10233 Data for stars in 1 h <= RA < 2 h
sky2.dat 463 10084 Data for stars in 2 h <= RA < 3 h
sky3.dat 463 9829 Data for stars in 3 h <= RA < 4 h
sky4.dat 463 10423 Data for stars in 4 h <= RA < 5 h
sky5.dat 463 13702 Data for stars in 5 h <= RA < 6 h
sky6.dat 463 16944 Data for stars in 6 h <= RA < 7 h
sky7.dat 463 16880 Data for stars in 7 h <= RA < 8 h
sky8.dat 463 15002 Data for stars in 8 h <= RA < 9 h
sky9.dat 463 12544 Data for stars in 9 h <= RA < 10 h
sky10.dat 463 11487 Data for stars in 10 h <= RA < 11 h
sky11.dat 463 10611 Data for stars in 11 h <= RA < 12 h
sky12.dat 463 10154 Data for stars in 12 h <= RA < 13 h
sky13.dat 463 10370 Data for stars in 13 h <= RA < 14 h
sky14.dat 463 10685 Data for stars in 14 h <= RA < 15 h
sky15.dat 463 11334 Data for stars in 15 h <= RA < 16 h
sky16.dat 463 11934 Data for stars in 16 h <= RA < 17 h
sky17.dat 463 13046 Data for stars in 17 h <= RA < 18 h
sky18.dat 463 15477 Data for stars in 18 h <= RA < 19 h
sky19.dat 463 16492 Data for stars in 19 h <= RA < 20 h
sky20.dat 463 16064 Data for stars in 20 h <= RA < 21 h
sky21.dat 463 13324 Data for stars in 21 h <= RA < 22 h
sky22.dat 463 11789 Data for stars in 22 h <= RA < 23 h
sky23.dat 463 10841 Data for stars with RA >= 23 h
sky.txt 80 713 Detailed discussion
confer.txt 80 418 Paper prepared for AIAA meeting
deficent.txt 80 38 Known deficiencies
ref.dat 75 186 *Reference table
--------------------------------------------------------------------------------
Note on ref.dat:
Although a format table is provided for this file, it should be noted
that the complete reference usually occupies several lines. Moreover,
the secondary reference is in the same bytes as the prime reference.
Finally, in order to indicate the source of the reference, symbols are
used in addition to the reference number itself.
See also: Flight Dynamics' Star Catalog Database
http://fdd.gsfc.nasa.gov/attitude/skymap.html
Byte-by-byte Description of file: sky*.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 I8 --- ID Skymap number
9- 14 I6 --- HD ?Henry Draper number
15 I1 --- HD_dup *? HD duplicity indication
16 A1 --- u_HD HD identification uncertain
17- 22 I6 --- SAO ?Smithsonian Astrophy. Obs. cat. number
23 A1 --- SAO_comp SAO component
24- 25 A2 --- DM_cat Durchmusterung catalog
26- 28 I3 deg DM_zone ?Durchmusterung zone
29- 33 I5 --- DM_num ?Durchmusterung number
34 A1 --- DM_comp Durchmusterung component
35 A1 --- DM_supp Durchmusterung supplement letter
36 A1 --- u_DM_num [: ] DM identification uncertain
37- 40 I4 --- HR ?Harvard Revised Photometry num. (=BS)
41- 50 A10 --- WDS Washington Catalog of Double Stars num.
51- 55 A5 --- WDC_comp WDS components
56 A1 --- u_WDS [: ] WDS identification uncertain
57- 62 I6 --- PPM ?Position and Proper Motion number
63 A1 --- u_PPM [: ] PPM identification uncertain
64- 71 I8 --- ID_merg ?Skymap num. of last skymap entry merged
with this star
72- 81 A10 --- name Star name (or AGK3 number)
82- 91 A10 --- var Variable star name (or
doubtful variability)
92- 93 I2 h RAh Right ascension (J2000) hours
94- 95 I2 min RAm Right ascension (J2000) minutes
96-101 F6.3 s RAs Right ascension (J2000) seconds
102 A1 --- DE- Declination sign
103-104 I2 deg DEd Declination degrees (J2000)
105-106 I2 arcmin DEm Declination minutes (J2000)
107-111 F5.2 arcsec DEs ?Declination seconds (J2000)
112-117 F6.2 arcsec u_pos ?Position uncertainty
118 A1 --- n_pos Blended position flag
119-120 I2 --- r_pos Source of position
121-127 F7.4 arcsec/a pmRA ?Proper motion in RA (J2000)/cos(Dec)
128-134 F7.3 arcsec/a pmDE ?Proper motion in Dec (J2000)
135-136 I2 --- r_pm ?Source of proper motion data
137-142 F6.1 km/s RV ?Radial velocity
143-144 I2 --- r_RV ?Source of radial velocity data
145-150 F6.3 arcsec Plx ?Trigonometric parallax
151-156 F6.4 arcsec u_Plx ?Trigonometric parallax uncertainty
157-158 I2 --- r_Plx ?Source of trigonometric parallax data
159-167 F9.6 --- GCI_X *GCI unit vector in X (J2000)
168-176 F9.6 --- GCI_Y *GCI unit vector in Y (J2000)
177-185 F9.6 --- GCI_Z *GCI unit vector in Z (J2000)
186-191 F6.2 deg GLON Galactic longitude (B1950)
192-197 F6.2 deg GLAT Galactic latitude (B1950)
198-203 F6.3 mag V ?Observed visual magnitude (V or v)
204-208 F5.2 mag V_der ?Derived visual magnitude
209-213 F5.3 mag u_V ?Derived v or observed visual magnitude
uncertainty
214 A1 --- n_V [b]Blended visual magnitude flag
215-216 I2 --- r_V ?Source of visual magnitude
217 I1 --- d_V ?V magnitude derivation flag
218-223 F6.3 mag B ?B-magnitude (observed)
224-229 F6.3 mag B-V ?B-V color (observed)
230-234 F5.3 mag u_B ?B or (B-V) magnitude uncertainty
235 A1 --- n_B [b]Blended b-magnitude flag
236-237 I2 --- r_B ?Source of b-magnitude
238-243 F6.3 mag U ?U-magnitude (observed)
244-249 F6.3 mag U-B ?U-B color (observed)
250-254 F5.3 mag u_U ?U or (U-B) magnitude uncertainty
255 A1 --- n_U Blended u-magnitude flag
256-257 I2 --- r_U ?Source of u-magnitude
258-261 F4.1 mag mag_ptv ?Photovisual magnitude (observed)
262-263 I2 --- r_mag_ptv ?Source of ptv magnitudes
264-267 F4.1 mag mag_ptg ?Photographic magnitude (observed)
268-269 I2 --- r_mag_ptg ?Source of ptg magnitudes
270-299 A30 --- Sp_MK Morgan-Keenan (MK) spectral type
300-301 I2 --- r_Sp_MK ?Source of MK spectral type data
302-304 A3 --- Sp *One-dimensional spectral class
305-306 I2 --- r_Sp ?Source of one-dimen. spectral class
307-313 F7.3 arcsec sep ?Separation of brightest and second
brightest components
314-318 F5.2 mag del_mag ?Magnitude difference of the brightest
and second brightest components
319-325 F7.2 yr per_orb ?Orbital period
326-328 I3 deg PA ?Position angle
329-335 F7.2 yr date ?Year of observation (AD)
336-337 I2 --- r_dup ?Source of multiplicity data
338 A1 --- b_del_mag Passband of multiple star mag. dif.
339-345 F7.4 deg dis_near ?Distance to nearest neighboring star in
the master catalog
346-352 F7.4 deg dis_2 ?Dist. to nearest neighboring master
cat. star no more than 2 mag. fainter
353-360 I8 --- ID_A ?Skymap number of primary component
361-368 I8 --- ID_B ?Skymap number of second component
369-376 I8 --- ID_C ?Skymap number of third component
377-381 F5.2 mag mag_max ?Maximum variable magnitude
382-386 F5.2 mag mag_min ?Minimum variable magnitude
387-391 F5.2 mag var_amp ?Variability amplitude
392 A1 --- n_var_amp Passband of variability amplitude
393-400 F8.2 d var_per ?Period of variability
401-408 F8.2 d var_Epoch ?Epoch of var. in JD - 2400000
409-411 I3 --- var_typ ?Type of variable star
412-413 I2 --- r_var ?Source of variability data
414-419 F6.3 mag mag_1 ?Passband #1-magnitude (observed)
420-425 F6.3 mag v-mag_1 ?v - passband #1 color
426-430 F5.3 mag u_mag_1 ?Passband #1 uncertainty in mag. or col.
431 A1 --- mag_1_sy *Passband #1 photometric system
432 A1 --- p_mag_1 *Passband #1
433-434 I2 --- r_mag_1 ?Source of passband #1: mag. or color
435-440 F6.3 mag mag_2 ?Passband #2-magnitude (observed)
441-446 F6.3 mag v-mag_2 ?v - passband #2 color
447-451 F5.3 mag u_mag_2 ?Passband #2 uncertainty in mag. or col.
452 A1 --- mag_2_sy *Photometric system passband #2
453 A1 --- p_mag_2 *Passband #2:
454-455 I2 --- r_mag_2 ?Source of passband #2: mag. or color
456-461 F6.3 mag mag1-mag2 ?Passband #1 - passband #2 color
462 A1 --- n_mag_1 [b]Blended passband #1 mag/color flag
463 A1 --- n_mag_2 [b]Blended passband #2 mag/color flag
--------------------------------------------------------------------------------
Note on HD_dup:
1. indicates this the brighter component of a system with a companion
>= 0.3 mag.
2. indicates this is the fainter component of a system with a companion
<= 0.3 mag. fainter e
9 indicates that this is a blend of two HD stars. The HD number is the
lower of the two.
Note on GCI_X:
cos(Dec)*cos(RA)
Note on GCI_Y:
cos(Dec)*sin(RA)
Note on GCI_Z:
sin(Dec)
Note on Sp:
i.e. HD, AGK3, or SAO
Note on mag_1_sy:
Photometry is on the RI system. This byte indicates whether it is
Johnson or Russian)
Note on p_mag_1:
Filter used (currently, only R)
Note on mag_2_sy:
Photometry is on the Johnson, Eggen, or Cousins system. This byte
indicates which.
Note on p_mag_2:
Filter used (currently, only I)
-------------------------------------------------------------------------------
Byte-by-byte Description of file: ref.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- ID *Reference number
8- 27 A20 --- name Common name of catalog
29- 75 A47 --- ref Complete reference
--------------------------------------------------------------------------------
Note on ID:
* Items referenced in this paper
( ) = via SKYMAP Master Star Catalog, Version 3.7
[ ] = new sources for Version 4.0
< > = new sources for Version 4.0a
All other sources added for Versions 4.1 and 4.2
In addition to the main reference, this column gives a secondary
reference for those taken from Skymap 3.7.
Acknowledgement:
The ADC thanks Dr. W.H. Warren Jr. for his help resolving some
of the problems and uncertainties we had with the interpretation
of the data.
================================================================================
(End) N.G. Roman [ADC/SSDOO] 25-Jul-1997