| Show | code | author ⇓ |
| Show | PAO | Paunovuc, D.. |
| Show | PPB | Patten, P.B., Stauffer, J.R., Burrows, A., Marengo, M., Hora, J.L., Luhman, K.L., |
| Show | PAT | Patience, J., Ghez, A.M., Reid, I.N., Weinberger, A.J., & Matthews, K. |
| Show | PNS | Parsons, S.B. |
| Show | PAR | Parkhurst, J.A. |
| Show | PRG | Parenago, P.P. |
| Show | PAS | Paraskevopoulos, J.S. |
| Show | PNC | Pansecchi, L. |
| Show | PAN | Panjaitan, E. & Herdiwijaya, D. |
| Show | PLQ | Paloque, E. |
| Show | PLC | Palacios, R. Cid |
| Show | PAD | Padgett, D.L. Strom, S.E. & Ghez, A. |
| Show | OUD | Oudmaijer, R.D. & Parr, A.M. |
| Show | OSW | Oswalt, T.D., Hintzen, P.M., & Luyten, W.J. |
| Show | OSV | Osvalds, V. |
| Show | OST | Osterloh, M., Henning, Th., & Launhardt, R. |
| Show | OSG | Osgood, T.H. |
| Show | OSB | Osborn, W.H. |
| Show | OSA | Osanai, D. (in Rica Romero, F.M.) |
| Show | ORL | Orlov, V.G., Voitsekhovich, L.J., and and Garfias, F. |
| Show | OPP | Oppenheimer, B.R., Golimowski, D.A., Kulkarni, S.R., Matthews, K., Nakajima, T., |
| Show | OPL | Oplistilova, A., Mayer, P., Harmanec, P. et al. |
| Show | OPZ | Opitz, D., Tinney, C.G., Faherty, J., Sweet, S., Gelino, C., & Kirkpatrick, J.D. |
| Show | OPI | Opik, E. |
| Show | OPA | Opalski, W. |
| Show | OOS | Oosterhoff, P. Th. (from additional DD list) |
| Show | OMO | Omodeo, A. |
| Show | OL | Olivier, C.P. |
| Show | OLE | Olevic, D. |
| Show | OAS | Oletzen, W. (and Burnham, S.W.) |
| Show | IAU | Oksala, M. (IAU Symposium 307, in press) |
| Show | OH | Oh, S., Price-Whelan, A.M., Hogg, D.W., Morton, T.D., & Spergel, D.N. |
| Show | OGLT | OGLE Transit program |
| Show | OGL | OGLE (Optical Gravitational Lensing Experiment; see Pli2012) |
| Show | OFK | Ofek, E.O., Muno, M., Quimby, R., Kulkarni, S.R., Stiele, H., Pietsch, W., |
| Show | OEL | Oelkers, R.J., Stassun, K.G., & Dhital, S. |
| Show | ODE | Odenkirchen, M. & Brosche, P. |
| Show | OCH | Ochsenbein, Francois |
| Show | ONL | Occult. News Letters (from Ccd2002 DD list) |
| Show | OMG | Observatory of Manises |
| Show | OCA | Observatoire de la Côte d'Azur |
| Show | OBL | Oblomievsky (Pulkova) |
| Show | NYS | Nys, O. |
| Show | NYF | Nyfeldt, A. |
| Show | NUG | Nugent, R.L. |
| Show | NVL | Novalbos, I. |
| Show | NOV | Novakovic, B. & Todorovic, N. |
| Show | NOS | Noschese, A. |
| Show | NOR | North, J.R., Davis, J., Tuthill, P.G., Tango, W.J., & Robertson, J.G. |
| Show | NRR | Norro, A. |