- Neckel-Vehrenberg (planetary nebulae) New - ? (galaxies) New 1 in Cetus (source: The Deep-Sky Field Guide to Uranometria 2000.0, Cragin-Lucyk-Rappaport, chart 262). New 5 in Sagittarius (thus mentioned on chart 22 of Wil Tirion's Sky-Atlas 2000.0, mentioned as ESO 285-G7 on charts 411 and 412 in Uranometria 2000.0 Volume 2, 1987 edition). New 6 in Indus (chart 23 in Tirion's Sky-Atlas 2000.0, chart 413 in the 1987 edition of Uranometria 2000.0, Volume 2) (as ESO 287-G13) NGC — New General Catalogue NGTS - Next-Generation Transit Survey (extrasolar planets) NHICAT — Northern HIPASS Catalog NLTT — New Luyten Two-Tenths Catalogue NOMAD — The Naval Observatory Merged Astrometric Dataset (NOMAD) NStars — Nearby Stars Database NSV — New Catalogue of Suspected Variable Stars NZO - New Zealand Observatory (double stars) O O - O'Neal (open star clusters) OEC — Open Exoplanet Catalogue OGLE — Optical Gravitational Lensing Experiment Ol - Charles Pollard Olivier (double stars) Opik - Ernst J. Opik (double stars) OSC — Open Supernova Catalog OΣ - Otto Struve, Pulkovo Catalogue, 1843 (double stars) OΣΣ - Otto Struve, Pulkovo Catalogue Supplement, 1843 (double stars) OSS — Ohio Sky Survey OTC — Open TDE Catalog OTS - Oasa-Tamura-Sugitani Ou - Nicolas Outters (for example: Ou 4, the 'Squid Nebula' in Cepheus) (see APOD - Astronomy Picture Of the Day - July 18, 2014). P P - Perrine (double stars) PAL — Palomar Globular Clusters (15 globular clusters discovered on the Palomar Observatory Sky Survey plates) Par - Parkhurst (double stars) PB - Peimbert-Batiz (planetary nebulae) PC - Peimbert-Costero (planetary nebulae) Pe - Perek (planetary nebulae) Perr - Perrotin (double stars) Perry - Perry (double stars) PG - Palomar-Green (catalogue of ultraviolet excess stellar objects) PGC — Principal Galaxies Catalogue PH - Planet Hunters PHL — Palomar-Haro-Luyten catalogue Pi - Pismis (Paris Pişmiş, 1911-1999) (catalogue of 22 open star clusters and 2 globular star clusters) PK — Catalogue of galactic planetary nebulae (Perek-Kohoutek) PKS - Parkes Catalogue of Radio Sources Platais - Imants Platais' catalogue of open star clusters Plq - Paloque (double stars) PLX — General Catalogue of Trigonometric Stellar Parallaxes and Supplement (Jenkins, Yale University) PM - Preite Martinez (planetary nebulae) PMC — Tokyo Photoelectric Meridian Circle Catalog PN — See PNG PNG — Strasbourg-ESO Catalogue of Galactic Planetary Nebulae Pol - Pollock (double stars) Pou - Pourteau (double stars) PPM — Positions and Proper Motions Star Catalogues Pri