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Related Links
Because the text file has been compiled using
a field to "SEARCH" specifically columns 1-6 the "running number", the data can be
searched in TheSky using
the find dialog (Edit | Find). You must precede the Find entry with
Fertzinger then enter the NUMBER you wan to search for.
See below.
Distribution of data
Total 489 entries
Edit | Find | Feitzinger
then NUMBER to
search
Each entry from the SEARCH field listed
If you wish to have each object
centered for you and the Object Information displayed as you scroll down the
list just place a check in the Frame Object and Object Information boxes as
shown above.
To label the fields use View | Display
Explorer and EXPAND the "LDN" entry under Sky Databases (SDB's) as
shown below. There you can place a check mark next to the
fields you wish to have labeled on the screen.
Pick fields you want labeled
View | Display Explorer
Next make sure the "EXTENDED
LABELS" are set to "visible" AND secondly make sure the Object Type Dark
Nebula is also enabled. View | Labels | Extended Labels for labels and
View | Display Explorer | Dark Nebula is set to visible.
Keep in mind that enabling several
fields at once clutters the screen.
View | Labels | Extended Labels
Make sure they are checked!
Also enable Nebula | Dark Nebula
Make sure Dark Nebulae are visible
Lastly. Use the Display Properties for Dark
Nebulae to set the Font type, size, color, nebulae fill color, etc.
See below.
View | Display Explorer | Display Properties
Choose what suits you!
Display Properties
Dark Nebula
Recompiling the data is quite
simple BECAUSE the header does all the work for you! If you wish to
change the Search field, or the order of the fields shown in the Object
Identification dialog feel free to do so.
Make any changes you want then just use Data | Import and Browse the text file
by name on your local drive and press the "COMPILE" button highlighted
below.
Data | Import
Then press Compile
>SEARCH 1,3
>ALIAS 90,120
>RAHOURS 38,39
>RAMINUTES 44,47
>DECSIGN 50,50
>DECDEGREES 52,53
>DECMINUTES 57,59
>MAJOR AXIS 75,81
>MINOR AXIS 75,81
>PARSE "Running Number" 1,3
>PARSE "Field Number / Foil / Seq" 5,16
>PARSE "Two Letter Code Description" 17,18
>PARSE "Area arcminutes" 75,81
>PARSE "[1/6] Opacity class (4)" 83,83
>PARSE "Vanden Bergh Classification" 84,89
>PARSE "Glong / Glat of center" 21,36
>PARSE "Ident Cross-references (7)" 112,140
>IDENTIFIER Feitzinger
>OBJECT TYPE 16
>LOADMEMORY
1 492 ESO 02DC 236.44 -4.71 7 16.3 - 22 56 0.829 49.74 1BETA -50 44 118
2 492 ESO 01DC 236.61 -2.44 7 25.3 - 22 1 1.461 87.66 1BETA 67 -67 168
...
NOTE! The data
deviates from the original. The size of the objects in arcminutes was added and
the spacing changed slightly! This dataset is not in its' original untouched
form! That was done so the sizes if the nebulae would display!
Dark Nebulae near Trifid and Lagoon
Running Number and Van den Bergh fields labeled
Catalog Capriciousness
<----Click here for a complete synopsis on-line reprint of a very
informative article by Stuart Goldman of
Sky and Telescope magazine.
Background information
VII/68A Dark Nebulae and Globules for l=240-360deg (Feitzinger+ 1984)
================================================================================
Catalogue of Dark Nebulae and Globules for Galactic Longitudes 240
to 360 degrees.
Feitzinger J.V., Stuewe J.A.
<Astron. Astrophys. Suppl. Ser. 58, 365 (1984)>
<Astron. Astrophys. Suppl. Ser. 63, 203 (1986)> (Erratum)
=1984A&AS...58..365F (SIMBAD/NED BibCode)
================================================================================
ADC_Keywords: Globules ; Nebulae
Description: (adapted from Anne C. Raugh, NASA STI-T-1-5810-508-86)
The catalog is a compilation of data gleened from a study of the
European Southern Observatory Quick Blue Survey (ESO(b)) and SRC-J Sky
Atlas on 489 dark clouds and 331 globules. The data compiled include
position, size, opacity and morphological classification (in the
system of van den Bergh, 1972). Also included is a FITS file containing
a 500x1400 pixel map of the survey area.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
darkneb 110 489 The Dark Clouds
globules 110 331 The Globules
skymap.dat 500 1400 *Map of survey area as numbers
skymap.fit 2880 488 FITS Map of survey area
--------------------------------------------------------------------------------
Note on skymap.dat: image of the survey area where each byte represents
one pixel and holds a grey-level value in the range 0-6, 0 being clear
and 6 most opaque. Pixels are separated by 0.1 degree in both latitude
and longitude.
Byte-by-byte Description of file: darkneb, globules
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- FEST Running Number
6- 8 I3 --- Field Field number in ESO/SRC Survey
10- 12 A3 --- Foil Foil (SRC) or Plate (ESO) (1)
14- 17 A4 --- Seq Number in field (2)
18- 19 A2 --- Desc Two-letter code description (3)
22- 27 F6.2 deg GLON Galactic longitude of center
29- 34 F6.2 deg GLAT Galactic latitude of center
37- 38 I2 h RAh Right Ascension 1950 (hours)
40- 43 F4.1 min RAm Right Ascension 1950 (minutes)
46 A1 --- DE- Declination 1950 (sign)
47- 48 I2 deg DEd Declination 1950 (degrees)
50- 51 I2 arcmin DEm Declination 1950 (minutes)
53- 58 F6.3 deg2 Area ? Area (for dark nebulae)
59- 60 I2 --- Mult ? Number of globules ("globules" file) (8)
62 I1 --- OpClass [1/6] Opacity class (4)
63- 67 A5 --- Class van den Bergh Classification (5)
70- 72 I3 deg i [-90/90]? Galactic inclination angle (6)
75- 80 F6.1 mm Xmm [-260/1300] X-plate coordinate
82- 87 F6.1 mm Ymm [-260/300] Y-plate coordinate
90-120 A31 --- Ident Cross-references (7)
--------------------------------------------------------------------------------
Note (1): In general, the SRC-J foils were the primary source of data
and the corresponding ESO(B) glass plates were used as a validity check.
When the foil was not available the plate became the primary source.
"ESO" indicates the data were taken from the ESO(B) glass plate of
the survey field.
"SRC" indicates the data were taken from the SRC-J foil of
the survey field.
Note (2): Generally this is an integer, but in two cases (both globular
filaments) this is a Roman numeral, right-justified within the
character field.
Note (3): the two-letter code describing the appearance of the object:
CG Cometary globule
DC Dark cloud
DF Dark filament
EN Embedded in (bright) nebulosity
GF Globular filament
ST Worm track or elephant trunk (equivalent to WT)
TA Tail of a cometary globule
WT Worm track or elephant trunk (equivalent to ST)
Note (4): Opacity on a scale of 1 to 6, 6 being the most opaque.
Note (5): van den Bergh classification scheme consists of four
different classes, each denoted by a single Greek letter:
ALPHA Amorphous cloud exhibiting very fuzzy or indistinct edges
BETA Clouds with some structure and relatively well-defined edges
GAMMA Absorption features with sharp edges which are not located
in H II regions
DELTA Sharp-edged absorption features located in H II regions
For objects that fall between classes, the Greek letters are
abbreviated as A B G D respectively.
For some cometary globules the head and tail have distinct
opacities and van den Bergh classifications.
Note (6): Inclination angle of elongated dark clouds measured
counterclockwise against the galactic plane,:eq. in degrees.
Note (7): Cross references consist in two-letter code followed by an
up to three-digit number that identifies the object as also being
listed in the reference denoted by the letter code.
SL Sandqvist and Lindroos
S Sandqvist (1977)
CG Zealy et al. (1983)
The numbers are those of the object in the cited paper.
In some cases the object appeared in more than one paper, in which
case there are two or more full references, or appears more than once
in a single paper, in which case the additional numbers are separated
by commas (for example, the cross-reference for dark nebula number 225
is S 155,157)
Note (8): if the object is actually a complex of globules, Mult is the
number of individual globules. The coordinates given refer to the
approximate center of the entire complex.
References:
Feitzinger, J. V. and Stuewe, J. A. 1984, Astron. Astrophys. Suppl.
Ser. 58, 365
Sandqvist, Aa. 1977, Astron. Astrophys. 57, 467
van den Bergh, S. 1972, Vistas in Astron. 13, 265
Zealy, W. J., Ninkov, Z., Rice, E., Hartley, M., and Tritton, S. B. 1983,
Astrophys. Letters 23, 119
Historical Notes:
* 1986 (Anne C. Raugh, ADC):
The catalogue was sent to the Astronomical Data Center (ADC), NASA
Goddard Space Flight Center, by the Centre de Donnees Astronomiques
(CDS), in February 1986.
The original tape contained four text files formatted in the same
manner as in the published catalog.
The catalog was so well formatted that the only editing done was to
correct several minor typographic errors and to replace the character
string "---" indicating a null value for the inclination field, with a
string of blanks, in order to avoid errors in trying to read that
field with a FORTRAN I5 format. A FORTRAN program was run that checked
the validity of each field according to its data type and value.
* 13-Jun-1995: standardised at CDS, and homogenized the formats of the
two files "darkneb" and "globules" such that they share the same
"Byte-by-Byte description"
================================================================================
(End) Anne C. Raugh [ADC] Francois Ochsenbein [CDS] 13-Jun-1995
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