This page is a transcript of the paper NED and SIMBAD Conventions for Bibliographic Reference Coding, describing the definition of the Bibliographic Reference Code, also called
REF_CODE
in this paper, and usually nowadays named bibcode in the CDS services.
NED and SIMBAD Conventions for Bibliographic Reference Coding, originally published in "Information & On-line Data in Astronomy", D. Egret & M.A. Albrecht, Eds., Kluwer Acad. Publ. (1995), p. 259.
M. Schmitz1, G. Helou1, P. Dubois2, C. LaGue1, B. Madore1, H. G. Corwin Jr.1 & S. Lesteven2
History
The uniform 19-digit code used for bibliographic references within
NED and SIMBAD was developed by both teams in consultation
with Dr. H. Abt, editor of the Astrophysical Journal.
The primary purpose of the REF_CODE
is to provide a unique
and traceable representation of a bibliographic reference within the
structure of each database.
However, in many cases, the code has sufficient information
to be quickly deciphered by eye, and it is used frequently in the
interfaces as a succinct abbreviation of a full bibliographic reference.
Since its inception,
it has become a standard code not only for NED and SIMBAD, but - with minor
variations - for ADS and
other bibliographic services. In addition,
the acronyms for journals used as part of the
code have become standards for some of the main
astronomical journals in
their own bibliographies.
Our main consideration in designing the REF_CODE
was to make
its definition as objective as possible. This helps to avoid having
the history of data entry affect the naming system; allows automatic
coding to some extent; avoids confusion, conflicts, and ambiguities
in its meaning; lets different individuals or teams
construct REF_CODE
s without having to resort to constant
consultation on the details of the code; and facilitates exchange
between databases (e.g. NED and SIMBAD).
Reference Coding: Definition
The standard code is a string 19 characters long, a combination of fields, some numerical and some alphabetic, exactly predictable for journal articles, but not necessarily for books. The format is as follows, with the various fields explained below. Blank spaces within the string are replaced with periods, and no leading zeros are allowed in volume and page numbers.
YYYYJJJJJVVVVMPPPPA
YYYY
- The four digits of the year of publication.
JJJJJ
- Code for the publication, entered left-justified within the five spaces. Five categories are distinguished:
- Periodicals
- Periodicals (including both regularly-published periodicals and occasional
publications): these codes are acronyms based on the names (as in
ApJ..
,A&A..
,PASJ.
,MNRAS
), and are reserved for all years.
The codes for the journals that NED presently scans directly are given in Table 1. Codes for journals currently scanned for the SIMBAD bibliography are given in Table 2, and a sample of codes for less-frequently encountered journals are given in Table 3. A complete listing of these tables is available on the World-Wide Web, on the NED and SIMBAD servers. - Catalogs
- Catalogs these codes are generally built from ''standard''
abbreviations of the catalogs' names. Examples are
UGC
,ESO
,RSA
, andRC3
. If the catalog is a multi-volume work, the volume number is inserted in the Volume field (see below). The codes for some often-used extragalactic catalogs are listed in Table 4. - Books
- Books (by which we mean all other monograph-length publications): the codes in this category are constructed in essentially the same way as those for periodicals and catalogs, from some or all of the initials (or following letters) of the title. While there is clearly some freedom in assigning codes to books, it is not necessary for the user to be able to identify a random book from its reference code (the database interface does the decoding as needed). Note also that the same code combined with a different year points to a different book.
- Theses
- thesis (primarily doctoral theses, but occasionally includes masters
theses): these codes are acronyms based on the name of the university
granting the degree (see Table 5 for examples; the complete
list is available on-line). For theses, the volume number field
(''VVVV'' below) contains ''
.T00
''. In the case of duplicate author initials, the ''.T00
'' becomes ''.T01
'', ''.T02
''. - Unpublished:
- this, unfortunately, is unavoidable as a category. If the reference
is to a collection of data never described in print, then this field will
contain the code ''
UNPUB
''. Private communications to NED or SIMBAD carry the code ''PrivC
''.
VVVV
- Volume number, right-justified, if the reference is to a periodical;
otherwise, the second character in this field is a letter that serves
as a classification flag. The following flags and classes of books are
presently identified:
flag class B textbook C catalog M digitized version (magnetic tape, CD-ROM, etc.) P preprint R report or conference proceeding S symposium T thesis U unpublished
For multi-volume books, catalogs, and reports, the volume number is given in the last two digits.
M
- This field is intended to break any remaining ambiguity after volume
number, page number, and author's initial have been specified. It is
used only when necessary, as in the following two classes of problems:
- One class of ambiguities results when there are two or more independent page sequences within the same volume number, in which case the following codes are reserved for this field:
- L
- Letters sections in various journals
- p
- Pink pages in MNRAS
- a, b, ..., z
- Issue numbers within the same volume, each of which starts with page 1 (e.g. Physics Today).
- A, B, ..., K
- Issue designations used by publisher within same volume, where each issue starts. with page 1.
- Another class of ambiguities results when there are two or more articles on the same page, as in Nature. Such articles starting on the same page are numbered sequentially in their order of appearance, and a code corresponding to this order is inserted in this field. In that case, the code has values
- Q, R, ..., Z
- First, second, ..., tenth article on the page.
For Theses, this field contains the author's first initial.
PPPP
- Page number of reference, or ''
...0
'' when the whole book is referenced. This field contains the page numbers, which are right-justified within the four spaces available, preceded by periods to fill empty spaces. A
- This field contains the first letter of the first author's last
name. This provides some redundancy in the code which might be useful in
tracking down errors. If the first author cannot be identified, or no
authorship is expressed, a colon (:) appears in this field. When the
REF_CODE
as a whole does not follow the standard rules described above (which might happen for books) a percent sign (%) is inserted in this field. This field is case sensitive.
Here are some examples to illustrate the use of the reference code:
- 1983ARA&A..21..177S Stein and Soifer. 1983, Ann. Rev. Astron. Astrophys. 21 177.
- 1988ApJ...324..767W Ward et al. 1988, Astrophys. J. 324 767.
- 1988ApJS...66..183J Jura. 1988, Astrophys. J. Suppl. 66 183.
- 1988PASP..100..625S Sandage. 1988, Publ. Astron. Soc. Pacific 100 625.
- 1988Natur.331.6157B Bergvall. 1988, Nature 331 6157.
- 1976ApJS...31..187D Dressel and Condon. 1976, Astrophys. J. Suppl. 31 187.
- 1978IAUC.3305....1K Kowal, Lo, and Sargent. 1978, IAU Circ No. 3305.
- 1988A&A...206L..23M Maurogordato et al. 1988, Astron. Astrophys. 206 L23.
- 1984IRSD..R....118G Gatley. 1984, in Lab. and Obs. IR Spectra of IS Dust proc. of the Hilo Workshop, July 1983, ed. Wolstencroft and Greenberg, p. 118.
- 1909UCB...T00E....F Fath, E. A. 1909, The Spectra of Some Spiral Nebulae and Globular Star Clusters, thesis, Univ. of Calif., Berkeley.
Conclusions
The Bibliographic Reference Code is a domain-specific code which was designed
to be sufficient for the immediate needs of
astronomy in uniquely, succinctly, and informatively
identifying bibliographic references. Nevertheless, the
REF_CODE
proved to be general enough to encompass most
of the existing astronomical literature.
But these REF_CODE
s were not
explicitly designed to be so general that they were guaranteed to
automatically encompass all presently available media, nor do they
necessarily fully anticipate future directions in publishing.
In combination with a descriptive reference database, the
cryptic form of the REF_CODE
can be (and is) attached to a more extensible
information listing. For instance, while the REF_CODE
carries
only the first page number of a reference, the Reference Database
carries the first and last page numbers of the article. Obviously, the same
qualifications apply to titles and authors which are highly
abbreviated in the REF_CODE
, but more fully represented in the
Database.
The same principles could be used to fully link a REF_CODE
to data cubes, CD-ROMs, external databases, animations,
simulations, time-tagged data, etc. While the Reference Code is
compact, it is not yet saturated; there are still fields with
room for added pointers to the new directions that the publishing of
astronomical data may take in the immediate future.
Acknowledgments
We thank Helmut Abt and the rest of the NED and SIMBAD groups for their help in defining the reference codes. Table 2 has been prepared with the kind help of Suzanne Laloë at the Institut d'Astrophysique de Paris. NED is a research support program operated by the Jet Propulsion Laboratory JPL, California Institute of Technology, under contract with the National Aeronautics and Space Administration (Astrophysics Division, Science Operations Branch). SIMBAD is maintained by the Centre de Données astronomiques de Strasbourg, France.
Tables
Table 1
NED Core Journal Acronyms
REF_CODE | Title |
---|---|
A&A.. |
Astron. Astrophys. |
A&AS. |
Astron. Astrophys., Suppl. Ser. |
Afz.. |
Astrofizika |
AJ... |
Astron. J. |
ApJ.. |
Astrophys. J. |
ApJS. |
Astrophys. J., Suppl. Ser. |
ARep. |
Astronomy Reports (formerly Soviet Astronomy) |
AstL. |
Astronomy Letters (formerly Soviet Astronomy Letters) |
IAUC. |
IAU Circulars. |
MNRAS |
Monthly Notices of the Royal Astronomical Society |
Natur |
Nature |
PASJ. |
Publ. Astron. Soc. Jap. |
PASP. |
Publ. Astron. Soc. Pac. |
SvA.. |
Soviet Astronomy (now Astronomy Reports) |
SvAL. |
Soviet Astronomy Letters (now Astronomy Letters) |
A full up-to-date list is available on-line via the Web.
Table 2
Journals scanned for SIMBAD bibliography
The list is frequenty updated, click here for the current version.
Ref_code | Title |
---|---|
A&A.. |
Astronomy & Astrophysics |
A&AS. |
Astronomy & Astrophysics Suppl. Ser. |
A&ARv |
Astronomy and Astrophysics Review |
AcA.. |
Acta Astronomica |
AcASn |
Acta Astronomica Sinica |
AcApS |
Acta Astrophysica Sinica |
ACiCh |
Astronomical Circular (Nankin) |
Afz.. |
Astrofizika |
AGAb. |
Astron. Gesellschaft Abstract Ser. |
AISof |
Astrophysical Investigations - Sofia |
AJ... |
Astronomical Journal |
AN... |
Astronomische Nachrichten |
APh.. |
Astroparticle Physics |
ApJ.. |
Astrophysical Journal |
ApJS. |
Astrophys. J. Suppl. Ser. |
ApL.. |
Astrophysical Letters and communications |
Ap&SS |
Astrophys. & Space Science |
Aster |
Aster |
Ast.. |
Astronomy |
ATsir |
Astron. Tsirk. |
AuJPh |
Australian J. Phys. |
AZh.. |
Astronomicheskij Zhurnal |
BAAS. |
Bull. American Astron. Soc. |
BaltA |
Baltic Astronomy |
BCFHT |
Bull. CFHT |
BICDS |
Bull. Inf. Centre Données Strasbourg |
BOBeo |
Bull. Obs. Astron. Beograd |
C&E.. |
Ciel et Espace |
ChA&A |
Chinese Astron. & Astrophys. |
C&T.. |
Ciel et Terre |
ComAp |
Comments on Astrophysics and space physics |
CoSka |
Cont. Astron. Obs. Skalnate Pleso |
CR2.. |
Comptes Rendus Acad. Sci. Ser. II |
EL... |
Europhysics Letters |
EM&P. |
Earth, Moon, and Planets |
FCPh. |
Fundamentals of Cosmic Physics |
FoPh. |
Foundations of Physics |
Gemin |
GEMINI Newsletter (RGO) |
IAUC. |
IAU Circular |
IBVS. |
IAU Inform. Bull. Variable Stars |
Icar. |
Icarus |
IrAJ. |
Irish Astron. J. |
ISKZ. |
Investigations of the Sun and Red Stars |
IzKry |
Izv. Krym. Astrofiz. Obs. |
JApA. |
Journal of Astrophysics and Astronomy |
JAF.. |
J. Astronomes Francais |
JAVSO |
J. American Assoc. Variable Star Obs. |
JBAA. |
J. British Astron. Ass. |
JBIS. |
J. British Interplanetary Society |
JHA.. |
Journal for the History of Astronomy |
JRASC |
J. Royal Astron. Soc. Canada |
KFNT. |
Kinematika Fizika Nebesnykh Tel. (Kiev) |
KoIs. |
Kosmic. Issl. (Cosmic research) |
LAstr |
L'Astronomie |
Mercu |
Mercury |
Msngr |
The Messenger |
MitAG |
Mitt. Astron. Gesellschaft |
MitVS |
Mitt. Verand. Sterne |
MNRAS |
Mon. Not. Royal Astron. Soc. |
MNSSA |
Mon. Not. Astron. Soc. South Africa |
MmSAI |
Mem. Soc. Astron. Ital. |
Natur |
Nature |
NewSc |
New Scientist |
Obs.. |
The Observatory |
PASAu |
Proc. Astron. Soc. Australia |
PASJ. |
Publ. Astron. Soc. Japan |
PASP. |
Publ. Astron. Soc. Pacific |
PAZh. |
Pis'ma Astron. Zh. |
PBeiO |
Publ. Beijing Astron. Obs. |
PhR.. |
Physics Reports |
PhRvA |
Physical Review A |
PhRvD |
Physical Review D |
PhRvL |
Physical Review Letters |
PhS.. |
Physica Scripta |
PhT.. |
Physics Today |
PNAOJ |
Publ. Nat. Astron. Obs. Japan |
POBeo |
Publ. Obs. Astron. Beograd |
PPMtO |
Publ. Purple Mountain Obs. |
P&SS. |
Planetary and Space Sciences |
PTRSL |
Philosophical Transactions R. Soc. London |
PZ... |
Peremennye Zvezdy (variable stars) |
QJRAS |
Quart. J. Royal Astron. Soc. |
Rech. |
La Recherche |
RMxAA |
Rev. Mexicana Astron. Astrofis. |
RoAJ. |
Romanian Astronomical Journal |
RPPh. |
Reports on Progress in Physics |
RvPD. |
Revue du Palais de la Découverte |
SAAOC |
South African Astron. Obs. Circ. |
SoByu |
Soobshch. Byurakan Obs. |
Sci.. |
Science |
SciAm |
Scientific American |
SciN. |
Science News |
SSRev |
Space Science Reviews |
S&T.. |
Sky & Telescope |
S&W.. |
Sterne und Weltraum |
VA... |
Vistas in Astronomy |
Table 3
Some additional Acronyms
Ref_Code | Title |
---|---|
A&R.. |
Astron. Raumfahrt |
AAfz. |
Astrometria Astrofizika |
AdAAp |
Advances in Astronomy and Astrophysics |
AExpr |
Astron. Express |
AISAO |
Astrofizik. Issledovanija, Special Astrophys. Obs. |
AnAp. |
Ann. Astrophys. |
AnCap |
Annals Cape Obs. |
AnTok |
Ann. Tokyo Astron. Obs. |
ArA.. |
Arkiv for Astron. |
ARA&A |
Annual Review of Astronomy and Astrophysics |
BAICz |
Bull. Astron. Inst. Czech. |
BAN.. |
Bull. Astron. Inst. Netherlands |
BANS. |
Bulletin of the Astron. Inst. of the Netherlands, Suppl. Series |
BITon |
Bol. Inst. Tonantzintla |
BOTT. |
Bol. Obs. Tonantzintla Tacub. |
CAFOE |
Circulaire Assoc. Francaise d'Observateurs d'Etoiles Variables |
CiBAA |
Circular of the British Astronomical Association |
CoAsi |
Contr. Asiago |
CR... |
C.R. Acad. Sci. |
CRA.. |
C.R. Acad. Sci. Ser. A |
CRB.. |
C.R. Acad. Sci. Ser. B |
ESOSP |
European Southern Observatory -- Scientific Preprints |
IAUCo |
IAU Colloquium |
IAUS. |
IAU Symposium |
IAUT. |
IAU Transactions |
NPhS. |
Nature, Physical Science |
Orion |
Orion |
PhRvB |
Physical Review B |
PhRvC |
Physical Review C |
Stern |
Die Sterne |
Urani |
Urania |
Table 4
Reference Codes for Selected Catalogs
Ref_Code | Title |
---|---|
1961CGCG..C01....0Z | Zwicky, Herzog, and Wild. 1960, CGCG Vol I |
1963CGCG..C02....0Z | Zwicky and Herzog. 1963, CGCC Vol II |
1966CGCG..C03....0Z | Zwicky and Herzog. 1966, CGCG Vol III |
1968CGCG..C04....0Z | Zwicky and Herzog. 1968, CGCG Vol IV |
1965CGCG..C05....0Z | Zwicky, Karpowicz, and Kowal. 1965, CGCG Vol V |
1968CGCG..C06....0Z | Zwicky and Kowal. 1968, CGCC Vol VI |
1982ESO...C......0L | Lauberts. 1982, ESO/Uppsala Survey |
1989ESOLV.C......0L | Lauberts and Valentijn. 1989, ESO--LV Photometry |
1962MCG...C01....0V | Vorontsov--Velyaminov and Krasnogorskaja. 1962, MCG Part I |
1964MCG...C02....0V | Vorontsov--Velyaminov and Arhipova. 1964, MCG Part II |
1963MCG...C03....0V | Vorontsov--Velyaminov and Arhipova. 1963, MCG Part III |
1968MCG...C04....0V | Vorontsov--Velyaminov and Arhipova. 1968, MCG Part IV |
1974MCG...C05....0V | Vorontsov--Velyaminov and Arhipova. 1974, MCG Part V |
1971CGPG..C......0Z | Zwicky. 1971, Selected Compact and Post--Eruptive Galaxies |
1973UGC...C......0N | Nilson. 1973, UGC |
1974UppOR...5....0N | Nilson. 1974, Selected Non--UGC Galaxies |
1976RC2...C......0d | de Vaucouleurs, de Vaucouleurs, and Corwin. 1976, RC2 |
1991RC3...C......0d | de Vaucouleurs, et al . 1991, RC3 |
1981RSA...C...0000S | Sandage and Tammann. 1981, Revised Shapley--Ames |
1983RVG...C......0P | Palumbo et al. 1983, Radial Velocity Catalog |
1985cqan.book.....V | Veron--C. and Veron. 1985, Quasars and Active Nuclei, 2nd ed |
1985SGC...C......0C | Corwin, de Vaucouleurs, and de Vaucouleurs. 1985, Southern Galaxy Catalog |
1959VV....C......0V | Vorontsov--Velyaminov. 1959, Interacting Galaxies |
Some unresolved bibcodes from the original paper have been corrected in Table 4.
Table 5
Examples of University Codes
Ref_Code | Title |
---|---|
CIT.. |
California Institute of Technology (U.S.A.) |
CornU |
Cornell University (U.S.A.) |
UCSD. |
University of California, San Diego (U.S.A.) |
UEdin |
University of Edinburgh (United Kingdom) |
UPari |
University of Paris (France) |
UTole |
University of Toledo (U.S.A.) |
UToro |
University of Toronto (Canada) |
YeshU |
Yeshiva University (Russia) |