| Show | code ⇓ | author |
| Show | LLO | Lloyd, J.P. |
| Show | LKCA | LkCa planetary companions |
| Show | LJG | Liebknecht, J.G. |
| Show | LIU | Liu, N., Gies, D.R., Xiong, Y., Riddle, R.L., Bagnuolo, W.G. Jr., Barry, D.J., |
| Show | LIT | Li, T., Marshall, J.L., Lepine, S., Williams, P. & Chavez, J. |
| Show | LIP | Lippincott, S.L. |
| Show | LIN | Ling, J.F. |
| Show | LIM | Liu, M.C., Graham, J.R., Ghez, A.M., Meixner, M., Skinner, C.J., Keto, E., |
| Show | LIL | Lillo-Box, J., Barrado, D., & Bouy, H. |
| Show | LIG | Ligi, R., Demangeon, O., Barros, S., Mesa, D., Bonavita, M., Vigan, A., |
| Show | LIE | Liebert, J., Williams, K.A., Holberg, J.B., & Sing, D.K. |
| Show | LIC | Li Causi, G., Antoniucci, S., Bono, G., Pedicelli, S., Lorenzetti, D., |
| Show | LIA | Liapanouv |
| Show | LI | Li, W., Evans, N.J., Harvey, P.M., & Colome,C. |
| Show | LHS | = Lynbrook High School, Launch High School or La Jolla High School |
| Show | LHR | Lohr, M.E., Norton, A.J., Gillen, E., Busuttil, R. Kolb, U.C., Aigrain, S., |
| Show | LHM | Lehman, D.A. |
| Show | LGR | Lagrange, A.-M., Beust, H., Udry, S., Chauvin, G., & Mayor, M. |
| Show | LGG | Lagage, P.O., Olofsson, G., Cabrit, S., Cesarsky, C.J., Nordh, L., & |
| Show | LFR | Ferrero, Laurent |
| Show | LFB | Lefebvre, M. |
| Show | LF | Farnsworth, A.H. |
| Show | LEW | Lewitzky, G. |
| Show | LEV | Levato, H., Morrell, N., Garcia, B., & Malaroda, S. |
| Show | LEU | Leuschner, A.O. |
| Show | LES | Leone, S. |
| Show | LEP | Lepine, S., Wallace, D., Shara, M., Moffat, A., & Niemela, V. |
| Show | LEO | Leonard, F.C. |
| Show | LEN | Lenzen, R., Hodapp, K.-W., & Reddmann, T. |
| Show | LEM | Lembang Obs. |
| Show | LEI | Leinert, Ch., Jahreiss, H., & Haas, M. |
| Show | LEH | Lehmann, H., Andrievsky, S.M., Egorova, I. Hildebrandt, G., Korotin, S.A., |
| Show | LEG | Leggett, S.K., Allard, F., & Hauschildt, P.H. |
| Show | LEF | Lefevre, J.R.A. |
| Show | LEE | Lee, O.J. (from additional DD list) |
| Show | LEC | Bonnet-Bidaud, J.M., Colas, F., Lecacheux, J. |
| Show | LEB | Le Bouquin, J.-B., Monin, J.-L., Berger, J.-P., Prato, L., Benisty, M., & |
| Show | LDT | = Lowell Discovery Telescope |
| Show | LDS | Luyten p.m. catalog (from additional DD list) |
| Show | LDN | von Lindenau, B.A. |
| Show | LDB | Lindenblad, I.W. |
| Show | LCY | Lucy, L.B. & Sweeney, M.A. |
| Show | LCS | Lucas, P.W., Roche, P.F., & Tamura, M. |
| Show | LCR | Lanchares, V. (Docobo et al.) |
| Show | LCL | Lacaille, N.L. |
| Show | LCJ | Lada, C.J., Muench, A.A., Lada, E.A. & Alves, J.F. |
| Show | LCH | Lachapelle, F.-R., Lafreniere, D., Gagne, J., Jayawardhana, R., Janson, M., |
| Show | LCC | = Leeward Community College |
| Show | LBZ | Labitzke, P. |
| Show | LBU | Le Beau, J. |