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Explore the Archive User Guide

Accepted Identifiers and Catalogs

The Exoplanet Archive maintains its own list of cross-identifications for every star in the Exoplanet Archive database. To search on a single star or planet, enter the star name in the "Object by Name" box. If the star/planet name is recognized by the Exoplanet Archive, you will be taken directly to the Exoplanet Archive Overview page for that object. To search around an object or location use the "Single Location/Object" box. In this case, the service will check both the Exoplanet Archive database and the SIMBAD database to match the object name. For more details, see the Inventory Service User Guide.

If you enter the name of a star of a multiple system, the component letters are case-sensitive. For example, the system 30 Ari B is not treated the same as 30 Ari b.

When entering a planet name, you must include a space between the star name and the planet letter. Planet letters are also case-sensitive.

For the prefixes mu/MU and nu/NU, the case does matter: mu/nu = Greek letter-named star in constellation, and MU/NU = variable star

The following table lists the recommended identifiers to use when looking up information on a single object in the Exoplanet Archive.

Catalog How to pose your query to the Exoplanet Archive Examples
Kepler Object of Interest (KOI) KOI NNNNN.NN KOI 100.01
Kepler Input Catalog (KIC) KIC NNNNNNN KIC 6922244
K2 K2-N K2-1
Note: Entering K2 with no number resolves to KOI-2.
Luyten Half-Second (LHS) Catalog † LHS NNNN[a] LHS 2201
The Henry Draper Catalog HD NNNNNN [A] HD 142
hD 178911B
The Hipparcos Catalog HIP NNNNNN [A], or
HIP 5158
hic 79431
The Gliese-Jahreiss Compilation GJ NNN [A], or
GJ NNN.N [A], or
GL NNN [A], or
GL 667C
GJ 3634
The Bayer-Flamsteed ggg CON [A] tau Boo
Common Name Use the name itself Fomalhaut
51 Peg
The Bright Star Catalog HR NNNN [A] HR 8799
The Durchmusterung Catalogs (BD,CD,CPD, SD).
Please see note below.
BDsNN NNNN [A], or
BD+20 5278
CD-51 641
CPD-51 330
The 2MASS Catalog 2MASS JHHMMSSSSsDDMMSSS [A] 2MASS J23072869+2108033
The WISE Final Release Catalog WISE JHHMMSS.ss+DDMMSS.s [A] WISE J185154.96+404703.8
The Washington Double Star Catalog WDS HHMMmsDDMM [A] WDS J02370+2439B
The Smithsonian Astrophysical Observatory Catalog SAO NNNNNN [A] SAO 91022
Taurus Auriga Perseus (TAP) Catalog TAP NN TAP 26
The Tycho Catalog TYC NNNN-NNNNN-N [A] TYC 1718-02350-1
Trans-Atlantic Exoplanet Survey TrES-NN TrES-03
Optical Gravitational Lensing Experiment (Transit Events) OGLE-TR-NNN OGLE-TR-111
Optical Gravitational Lensing Experiment (Bulge) OGLE YYYY-BLG-NNNL OGLE 2005-BLG-071L
Microlensing Observations in Astrophysics MOA YYYY-BLG-NNNL MOA 2003-BLG-053L
XO Survey XO-NN XO-01
Convection, Rotation, and Planetary Transits - Exoplanet COROT-EXO-NN COROT-EXO-01
Hungarian Automated Telescope - Planet HAT-P-NN HAT-P-3
Sagittarius Window Eclipsing Extrasolar Planet Search SWEEPS-NN SWEEPS-11
Wide Angle Search for Planets (WASP) WASP-NN WASP-2
PSR B1620-26
or PSR J1719-1438 b

† In the LHS Catalog, note that some stellar entries are designated by a small lower-case letter (e.g. LHS 5358b, which represents a star, not a planet). To query for a planet in such a system, use LHS NNNNa b.

In the instructions above:

  • N = an integer digit (0-9)
  • HH = an integer number of hours (00-23)
  • MM = an integer number of minutes (00-59)
  • m = fraction of a minute (0-9); e.g., MMm = 217 corresponds to 21.7 minutes
  • SSSS or SSS = seconds plus fraction of second (0000-5999 or 000-599); e.g., SSSS = 2248 corresponds to 22.48 seconds
  • DD = integer number of degrees (00-89)
  • YYYY = integer number of years (2000-2099)
  • A = a letter of the (English) alphabet (A-Z or a-z)
  • ggg = The full Greek letter (e.g., alpha, beta) or the 3 English letter abbreviation of Greek letters (e.g., alf, bet). For the Greek letters mu (μ) and nu (ν), please repeat the last character (muu, nuu) to enforce a three-character abbreviation.
  • s = "+" or "-" sign
  • CON = Three-letter abbreviation of constellation name (e.g., TAU, AND). See our complete list of constellation abbreviations here.

All other letters are entered as is. Note also that:

  • Italicized = an instruction
  • Anything written in [square brackets] may or may not be part of a query.
  • Leading zeros (0s) may be omitted
  • The Exoplanet Archive is case-sensitive only on the component and planet letters


Regarding Durchmusterung catalogs: The Exoplanet Archive uses the same designations as published in the original Durchmusterung catalogs. That is, the identifiers BD, CD, CPD, SD are not interchangeable. In the same spirit, the Exoplanet Archive also does not recognize the generic Durchmusterung (DM) identifier.

Regarding SIMBAD: This search function uses SIMBAD to find coordinates for object names that are not currently in the Exoplanet Archive.