| Show | code ⇑ | author |
| Show | MRL | Morel, P.J. |
| Show | MRN | Marion, L., Absil, O., Ertel, S., Le Bouquin, J.-B., Augereau, J.-C., Blind, N., |
| Show | MRO | de Freitas-Mourao, R.R. |
| Show | MRR | Merrill, P.W. |
| Show | MRS | Marson, R.G., Bedding, T.R., & Robertson, J.G. |
| Show | MRT | Morton, F. |
| Show | MRZ | Markowitz, W. |
| Show | MSA | Bensel, H., Gasik, R. Muller, F., Oursler, A., Oursler, W. Pahl, E. Phal, E., |
| Show | MSC | Masciadri, E., Brandner, W., Bouy, H., Lenzen, R., Lagrange, A.M., & Lacombe, F. |
| Show | MSD | Lendinez, J., Jose Caleya, F., Rica, F., Krawczenko, C. & Masa Martin, E.R. |
| Show | MSG | Messina, S., Hentunen, V.-P. & Zambelli, R. |
| Show | MSH | Meshkat, T., Bonnefoy, M., Mamajek, E.E., Quanz, S.P., Chauvin, G., Kenworthy, M., |
| Show | MSK | Maskelyne, N. |
| Show | MSN | Mason, B.D., McAlister, H.A., Hartkopf, W.I., & Bagnuolo, W.G. |
| Show | MSR | Massarotti, A., Latham, D., Torres, G., Brown, R., & Oppenheimer, B. |
| Show | MSS | Massone, G. |
| Show | MTC | Martinache, F., Rojas-Ayala, B., Ireland, M.J., Lloyd, J.P., & Tuthill, P.G. |
| Show | MTF | Mortari, F. |
| Show | MTG | Montagnier, G., Segransan, D., Beuzit, J.-L., Forveille, T., Delorme, P., |
| Show | MTH | Marth |
| Show | MTL | Mitchel, O.M. |
| Show | MTN | Martin, G., Ianna, P.A. |
| Show | MTR | Mantero, A. |
| Show | MTT | Montet, B.T., Bowler, B.P., Shkolnik, E.L., Deck, K.M., Wang, J., Horch, E.P., |
| Show | MTZ | Martinez, R.A. & Kraus, A.L. |
| Show | MUA | Muller, A., Carmona, A., van den Ancker, M.E., van Boekel, R., Henning, Th., & |
| Show | MUC | Murray, C.A. & Corben, P.M. |
| Show | MUG | Mugrauer, M., Neuhauser, R., Guenther, E., Hatzes, A.P., Huelamo, N., |
| Show | MUN | Mundler, M. |
| Show | MUR | Munoz, Ramon Sobrino |
| Show | MUT | Muterspaugh, M.W., Lane, B.F., Konacki, M., Burke, B.F., Colavita, M.M., |
| Show | MUZ | Muzic, K., Radigan, J., Jayawardhana, R., Ivanov, V.D., Faherty, J.K., Kurtev, R., |
| Show | MWL | Maiwald, M.O. |
| Show | MWT | Mawet, D., Mennesson, B., Serabyn, E., Stapelfeldt, K., & Absil, O. |
| Show | MXD | Maxted, P.F.L., Anderson, D.R., Collier Cameron, A., Doyle, A.P., Fumel, A., |
| Show | MYC | Mayer, Ch. |
| Show | MYE | Myers, P.C., Fuller, G.A., Mathieu, R.D., Beichman, C.A., Benson, P.J., |
| Show | MYM | Mayama, S., Tamura, M., Hayashi, M., Itoh, Y. Fukagawa, M., Suto, H., Ishii, M., |
| Show | MYN | Mayne, N.J., Naylor, T., Littlefair, S.P., Saunders, E.S., & Jeffries, R.D. |
| Show | MYP | Mayer, Pavel |
| Show | MYR | Meyer |
| Show | MYT | Mayer, Tobias |
| Show | MZA | Maiz-Apellaniz, J., Walborn, N.R., Morrell, N.I., Niemela, V.S., & Nelan, E.P. |
| Show | NAA | = Army and Navy Academy |
| Show | NAJ | Nakajima, T., Kulkarni, S.R., Gorham, P.W., Ghez, A.M., Neugebauer, G., Oke, J.B., |
| Show | NAK | Nakos, T., Sinachopoulos, D., & van Dessel, E. |
| Show | NAN | Nancarrow, B. |
| Show | NAO | = Nikolaev Astronomical Observatory |
| Show | NAR | Narsimhan, B. |
| Show | NAU | Naud, M.-E., Artigau, E., Malo, L., Albert, L., Doyon, R., Lafreniere, D., |