Definition of the Code Numbering System

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Durchmusterung Catalogues

• -40AABBBBB : CpD North of -52 without CoD counterpart
• -20AABBBBB : CoD South of -52 without CpD counterpart
• -00AABBBBB : CpD South of -52 (1875)
• -00AABBBBB : CoD North of -52 (1875)
• -00AABBBBB : BD North of -23 (1855)
• +00AABBBBB : BD Northern hemisphere

Field definition

HD and HDE, SAO, HIC, PPM Catalogues

• 100BBBBBB : HD and HDE
• 150BBBBBB : SAO
• 160BBBBBB : Hipparcos HIC
• 170BBBBBB : PPM

Field definition

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

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

Selected Areas

7AXXXBBBB : Stars in Selected Areas

A = catalogue identification

XXX = Selected Area number

BBBB = star number

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

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

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)