213 neue Veränderliche
214th Meeting of the American Astronomical Society
215th Meeting of the American Astronomical Society
216th Meeting of the American Astronomical Society
2175 Å and 3.4 Micron Absorption Bands and Carbon Depletion in the Diffuse Interstellar Medium
2175 Å Dust Map of the Milky Way
217807 (2000 XK44): Broad-band photometry of a slowly rotating near-Earth asteroid.
217th Meeting of the American Astronomical Society
218th Meeting of the American Astronomical Society
219th Meeting of the American Astronomical Society
21cm Radio Continuum and HI ATCA Survey of the Large Magellanic Cloud
21cm Radio Continuum Emission Survey of the Large Magellanic Cloud
21cm Survey of the Rosette Complex at 4' Resolution
21st Century Large Compact Telescope and Observatory
22 GHz continuum and spectral index maps of the galactic center region
22 GHz Detection of a Radio Continuum Source in the Center of the Masing Molecular Disk in NGC4258
22 GHz map of the Carina region.
22 GHz observations with the resurfaced central 17 M of the Parkes radio telescope
22 New Confirmed and Candidate Supernovae from CRTS and the GRB follow-up team
22 stelle rosse, molto luminose, per un binocolo 7×50.