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- R-SAW-7/79-22
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- DOCUMENTATION FOR THE MACHINE-READABLE VERSION OF THE
- LYNDS' CATALOGUE OF BRIGHT NEBULAE
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- July 1979
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- Contract NAS 5-25369
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- Theresa A. Nagy
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- Revised by:
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- Susan E. Gessner
- Lee E. Brotzman
- January 1991
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- Prepared for:
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- National Aeronautics and Space Administration
- Goddard Space Flight Center
- Greenbelt, Maryland 2077l
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- Prepared by:
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- Systems and Applied Sciences Corporation
- 68ll Kenilworth Avenue
- Riverdale, Maryland 20840
- TABLE OF CONTENTS
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- Section 1 - Introduction...............................................1-1
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- Section 2 - File Contents..............................................2-1
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- Section 3 - File Characteristics.......................................3-1
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- Section 4 - Remarks and Modifications..................................4-1
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- LIST OF TABLES
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- Table
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- 2-1 File Contents....................................................2-1
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- 3-1 File Characteristics.............................................3-1
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- ii
- SECTION 1 - INTRODUCTION
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- In recent years there has been a trend away from publishing catalogues in book
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- form to preparing catalogues by computer and distributing them on magnetic
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- tape, with appearance in book form a secondary occurrence. This memo is the
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- result of the development of the documentation for the machine-readable version
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- of the catalogue and includes the basic information given in the original
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- preface of the published catalogue. This memo should be distributed along with
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- any copy of the machine-readable version of the catalogue.
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- 1-1
- SECTION 2 - FILE CONTENTS
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- A byte-by-byte description of the contents of the catalogue is given in Table
- 2-1. The information in the "Description" column is derived mainly from the
- published version of the catalogue whenever possible. The "Suggested Format"
- column is for FORTRAN-formatted reads.
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- Table 2-1. File Contents (1 of 2). LYNDS' CATALOGUE OF BRIGHT NEBULAE
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- Bytes Description Format
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- 1-13 New Galactic Coordinates of the center
- of the cloud
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- 1-6 Latitude (b II) in Degrees F6.2
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- 7 Blank 1X
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- 8-13 Longitude (l II) in Degrees F6.2
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- 14 Blank 1X
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- 15-28 Equatorial Coordinates of the Center of
- the Cloud (Epoch 1950.0)
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- Right Ascension
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- 15-16 Hours I2
- 17-19 Minutes I3
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- 20-21 Blank 2X
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- Declination
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- 22 Sign Dec degrees (+/-) A1
- 23-24 Degrees I2
- 25-27 Minutes of Arc I3
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- 28-29 Blank 2X
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- 30-37 Dimensions of nebula as measured on the
- photograph on which it appeared at its
- brightest
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- 30-33 Largest Dimension in Minutes of Arc I4
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- 34 Blank 1X
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- 35-37 Smallest Dimension in Minutes of Arc I3
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- 38 Blank 1X
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- 39-45 Area of Nebulosity in Square Degrees F7.3
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- 46 Blank 1X
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- 2-1
- Table 2-1. File Contents (2 of 2)
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- Bytes Description Format
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- 47 Color on the scale: I1
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- 1 brighter on blue Palomar plate
- 2 about equal on both red and blue Palomar
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- 3 brighter on red Palomar plate
- 4 visible only on red Palomar plate
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- 48 Blank 1X
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- 49 Brightness scale with units 1 = brightest I1
- to 6 = barely detectable
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- 50 Blank 1X
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- 51-53 Identification Number - indicates I3
- whether or not the object is an isolated
- region (=0) or a region of different
- brightness located in a more extensive
- complex of nebulosities. For example,
- the entire Orion region with its many
- brief areas of emission and reflection
- has the identification number 73.
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- 54 Blank 1X
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- 55-62 Number of nebulosity if it is catalogued 8A1
- in:
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- NGC New General Catalogue
- IC Index Catalogue
- S Catalogue of H II Regions, Sharpless
- (1959)
- C Catalogue of Diffuse Galactic Nebulae,
- Cederblad (1956)
- DG Dorschner and Gurtler (1963)
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- 2-3
- SECTION 3 - FILE CHARACTERISTICS
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- The information contained in this section is sufficient for the user to read the
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- machine-readable version of the catalogue. The statistics of the contents of
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- the entire file are given in Table 3-1.
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- Table 3-1. File Characteristics.
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- LYNDS' CATALOGUE OF BRIGHT NEBULAE
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- CATALOGUE.....................................................LBN
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- NUMBER OF FILES...............................................1
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- LOGICAL RECORD LENGTH.........................................62
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- RECORD FORMAT.................................................Fixed
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- TOTAL NUMBER OF LOGICAL RECORDS...............................1125
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- 3-1
- SECTION 4 - REMARKS AND MODIFICATIONS
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- The initial version of the machine-readable version of the Lynds' Catalogue of
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- Bright Nebulae was received from the University of Maryland (originally ob-
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- tained from the author). This catalogue was published in 1965 in the Astro-
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- physical Journal Supplement (#105). The initial version was sorted by galactic
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- longitude so that the machine-readable version would be in the same order as
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- the published catalogue.
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- 4-1
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