Facility
- KVANT1
- Keck Telescopes1
- Kepler9
- Kiso Schmidt telescope1
- LAMOST4
- LOFAR7
- LPF1
- La Silla ESO 1.5m telescope1
- La Silla, primarily the ESO 50cm telescope, and others2
- Landessternwarte Heidelberg-Königstuhl1
- Liverpool Telescope1
- MAGIC3
- MASTER CATALOG7
- MAXI4
- MCD developped at LMD, with support of CNES and ESA2
- MESSENGER2
- MMT1
- MMT 6.5m telescope1
- MPC catalogue distributed by ARI/Zentrum für Astronomie Heidelberg.2
- MSSL1
