Definition of the Code Numbering System


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Durchmusterung Catalogues

Field definition

AA = declination zone ; BBBBB = star number

HD and HDE, SAO, HIC, PPM Catalogues

Field definition

BBBBBB = star number in the respective catalogues.


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Open and Globular Clusters

2XXXXBBBB : NGC Clusters
XXXX = NGC number,
BBBB = star number according to the authors quoted in the reference list;
3XXXXBBBB : IC Clusters
XXXX = IC number,
BBBB = star number according to the authors quoted in the reference list;
4AAXXBBBB : Anon clusters (less than 100 clusters)
AA = Code for discoverers' names,
XX = Cluster number according to the discoverer's list
BBBB = star number according to the authors quoted in the reference list
5AXXXBBBB : Anon clusters (more than 100 clusters)
A = Code for discoverers' names,
XXX = Cluster number according to the discoverer's list
BBBB = star number according to the authors quoted in the reference list

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Various catalogues and lists

60AABBBBB : Catalogues containing more than 10000 stars
AA = Authors identification
BBBBB = star number
61AAABBBB : Catalogues containing more than 1000 stars
AA = Authors identification
BBBBB = star number
62AAAABBB : Lists of less than 1000 stars
AAAA = Authors identification
BBB = star number
63AAXXBBB : Lists of stars appearing in multiple tables
AA = Author identification
XX = table number, BBB = star number
64XXAABBB : Lists or sequences of stars grouped by constellation
XX = Constellation code
AA = Author identification
BBB = star number
65XXABBBB : Code for variable stars
XX = Constellation code
A = Catalogue identification
BBBB = star number
66XXXXBBB : Loden's loose star clusterings
XXXX = Clustering number
BBB = star number
67XXXXBBB : Stars in Curtis Schmidt plates
XXXX = plate number
BBB = star number
680HHMMSS : Stars identified by their coordinates
HH = hours, MM = minutes, SS = seconds
69ZZZZZZZ : Lists of stars not included in the preceding definitions
Author identification
A sequential numbering has been developed

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Selected Areas

7AXXXBBBB : Stars in Selected Areas
A = catalogue identification
XXX = Selected Area number
BBBB = star number

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Catalogues by Declination Zones

8AAXXBBBB : Lists of stars divided by declination zones
AA = identification list
AA = 00-49 northern hemisphere zones
AA = 50-99 southern hemisphere zones
XX = zone, BBBB = star number

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Miscellanous Lists

90AAABBBB : Lists of stars in Clusters, Associations and field of galaxies
AAA = Code for field
BBBB = star number
92XXXXABB : Photoelectric sequences for NGC objects
XXXX = NGC number
A = authors' key
BB = star number
93XXXXABB : Photoelectric sequences for IC objects
XXXX = IC number
A = authors' key
BB = star number
94AHHHHDD : Stars identified by coordinates only
A = reference source
HHHH right ascension
DD declination
95AYXXBBB : Standard Regions
A = identification
XX = region
Y = 1-6 (A-F)
XX = 01-09
BBB = star number
96AXXBBBB : Miscellanous Regions
A = region identification
XX = region number
BBBB = star number
970AXXBBB : Miscellanous Regions
A = region identification
XX = region number
BBB = star number
971AAXBBB : Miscellanous Regions
AA = region identification
X = region number
BBB = star number
98AXXXBBB : Stars from lists of Giclas or Luyten
A = Catalogue identification
XXX = Chart number
BBB = star number
99XXXXBBB : LP stars in field with four digits
XXXX = field number
BBB = star number

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Special Codes

10GGGGBBBB : Stars from GSC and Tycho zones
GGGG = number of the GSC plate
BBBB = star number in the plate
11TTTTBBBBX : Multiple stars from TYCHO experiment
TTTT = first part of the number
BBBBB = second part of the number
X = component number
12HHMMfDDMM : Stars with RXJ designation (North)
HHMMf = right ascension (dot omitted)
DDMM = declination
13HHMMfDDMM : Stars with RXJ designation (South)
HHMMf = right ascension (dot omitted)
DDMM = declination
14FFFFFBBB : Stars in Burrell Schmidt plates (BPS)
FFFF = plate number
BBBB = star number
15FFFFFBBB : Stars in Curtis Schmidt plates (CS / BPS)
FFFFF = plate number
BBB = star number
16PPPFFBBB : Stars in UK Schmidt plates
PPP = plate number
FF = field number
BBB = star number
17RARA0DDD : White dwarf catalogue, north (WD)
RARA = right ascension
DDD = declination
18RARA0DDD : White dwarf catalogue, south (WD)
RARA = right ascension
DDD = declination
19RARA0DDD : Palomar-Green catalogue, north (PG) (ADS abstract)
RARA = right ascension
DDD = declination (+ sign becomes 0)
20RARA0DDD : Palomar-Green catalogue, south (PG) (ADS abstract)
RARA = right ascension
DDD = declination (- sign becomes 0)
21RARADDDD : Kitt Peak Downes catalogue, north (KPD) (ADS abstract)
RARA = right ascension
DDDD = declination (+ sign suppressed)
22RARADDDD : Kitt Peak Downes catalogue, south (KPD) (ADS abstract)
RARA = right ascension
DDDD = declination (- sign suppressed)
Jean-Claude.Mermilliod@obs.unige.ch
Last update: 06 December 2007