| Show | code | author |
| Show | KUN | Kun, M., Balog, Z., Muzuno, N., Kawamura, A., Gaspar, A., Kenyon, S., & Fukui, Y. |
| Show | KUZ | Kuzuhara, M., Tamura, M., Ishii, I., Kudo, T., Nishiyama, S., & Kandori, R. |
| Show | KZA | Kazeza, S.M. |
| Show | KZN | Kaznica, J.J. |
| Show | L | Lewis, T. |
| Show | LAB | Labeyrie, A., Bonneau, D., Stachnik, R.V., & Gezari, D.Y. |
| Show | LAC | Lacchini, G.B. |
| Show | LAD | Ladanyi, T. |
| Show | LAF | Lafreniere, D., Doyon, R., Marois, C., Nadeau, D., Oppenheimer, B.R., Roche, P.F., |
| Show | LAG | Lagrula, J.-P. |
| Show | LAL | de Lalande, J.-J. |
| Show | LAM | Lamont, J. |
| Show | LAN | Lange, M. |
| Show | LAO | Lacour, S., Biller, B., Cheetham, A., Greenbaum, A., Pearce, T., Marino, S., |
| Show | LAQ | Laques, P. & Morel, P.J. |
| Show | LAR | Larink, J. |
| Show | LAS | Lasgoity, C.A. |
| Show | LAT | Latham, D.N., Mazeh, T., Stefanik, R.P., Davis, R.J., Carney, B.W., |
| Show | LAU | Lau, H.E. |
| Show | LAW | Law, N.M., Hodgkin, S.T., & Mackay, C.D. |
| Show | LBD | Labadie, L., Rebolo, R., Villo, I., Perez-Prieto, J.A., Perez-Garrido, A., |
| Show | LBU | Le Beau, J. |
| Show | LBZ | Labitzke, P. |
| Show | LCC | = Leeward Community College |
| Show | LCH | Lachapelle, F.-R., Lafreniere, D., Gagne, J., Jayawardhana, R., Janson, M., |
| Show | LCJ | Lada, C.J., Muench, A.A., Lada, E.A. & Alves, J.F. |
| Show | LCL | Lacaille, N.L. |
| Show | LCR | Lanchares, V. (Docobo et al.) |
| Show | LCS | Lucas, P.W., Roche, P.F., & Tamura, M. |
| Show | LCY | Lucy, L.B. & Sweeney, M.A. |
| Show | LDB | Lindenblad, I.W. |
| Show | LDN | von Lindenau, B.A. |
| Show | LDS | Luyten p.m. catalog (from additional DD list) |
| Show | LDT | = Lowell Discovery Telescope |
| Show | LEB | Le Bouquin, J.-B., Monin, J.-L., Berger, J.-P., Prato, L., Benisty, M., & |
| Show | LEC | Bonnet-Bidaud, J.M., Colas, F., Lecacheux, J. |
| Show | LEE | Lee, O.J. (from additional DD list) |
| Show | LEF | Lefevre, J.R.A. |
| Show | LEG | Leggett, S.K., Allard, F., & Hauschildt, P.H. |
| Show | LEH | Lehmann, H., Andrievsky, S.M., Egorova, I. Hildebrandt, G., Korotin, S.A., |
| Show | LEI | Leinert, Ch., Jahreiss, H., & Haas, M. |
| Show | LEM | Lembang Obs. |
| Show | LEN | Lenzen, R., Hodapp, K.-W., & Reddmann, T. |
| Show | LEO | Leonard, F.C. |
| Show | LEP | Lepine, S., Wallace, D., Shara, M., Moffat, A., & Niemela, V. |
| Show | LES | Leone, S. |
| Show | LEU | Leuschner, A.O. |
| Show | LEV | Levato, H., Morrell, N., Garcia, B., & Malaroda, S. |
| Show | LEW | Lewitzky, G. |
| Show | LF | Farnsworth, A.H. |