Henize Catalogues of Hα-Emission Stars and Nebulae in the Magellanic Clouds Hf - Hoffleit (planetary nebulae) HFG - Heckathorn-Fesen-Gull HH - Herbig-Haro object HIC — Hipparcos Input Catalogue HIP — Hipparcos Catalogue HIPASS — HI Parkes All-Sky Survey Hld - E.S.Holden (double stars) Hlm - E.Holmes (double stars) Hln - Frank Holden (double stars) HN - William Herschel's 1821 catalogue (double stars) Ho - Hogg (open star clusters) Ho - G.W.Hough (double stars) Holmberg - Erik Holmberg (dwarf irregular galaxies) Hooke - Robert Hooke (double stars) Howe - H.A.Howe (double stars) HP - Haute Provence (globular star clusters) (for example: HP 1 in Ophiuchus, at 17:31.1 / -29°59') (source: The Deep Sky Field Guide To Uranometria 2000.0, Cragin-Lucyk-Rappaport) (and also Sky Catalogue 2000.0, Volume 2) HR — Bright Star Catalogue (Harvard Revised Catalogue) Hrg - L.Hargrave (double stars) Hrr - Harrington (telescopic asterisms) HΣ - Hermann Struve (double stars) HS - Hamburg Survey (quasars and blue stars) HSC - Hubble Source Catalog (lists of sources from the Hubble Space Telescope) Hst - C.S.Hastings (double stars) Hu - Humason (planetary nebulae) Hu - W.J.Hussey (double stars) Hurt - Robert Hurt (for example: globular star cluster Hurt 2, aka 2MASS-GC02 in Sagittarius) Huygens - Christiaan Huygens (double stars) HV - Harvard Variable HVGC - Hyper Velocity Globular Cluster (for example: HVGC-1 in the supergiant elliptical galaxy Messier 87 in Virgo) HVS - HyperVelocity Stars Hynek - J. Allen Hynek (double stars) Hz - Wulff D. Heintz (double stars) Hzg - E.Hertzsprung (double stars) I I - Robert Thorburn Ayton Innes (R.T.A.Innes, 1861-1933) (double stars) IC — Index Catalogue IC I — Index Catalogue I IC II — Index Catalogue II IDS — Index Catalogue of Visual Double Stars IGR — Integral Gamma-Ray source IPHAS — The INT Photometric Hα Survey of the Northern Galactic Plane IRAS — Infrared Astronomical Satellite IRS — International Reference Star Isk - Iskudarian (open star clusters) Isserstedt (telescopic asterisms) IsWe - Ishida-Weinberger (planetary nebulae) Ivanov (open star clusters) J J — Robert Jonckheere's catalogue of double star observations (see for an article about it) Ja - Jacoby (planetary nebulae) JaFu - Jacoby-Fullton (planetary nebulae) JAn - John A. Anderson (double stars) Jc - William Stephen Jacob (double stars) Jef - H.M.Jeffers (double stars) Jn - Jones (planetary nebulae) JnEr - Jones-Emberson (planetary nebulae) Jo - Jones (double stars) Johansson - (open star clusters) (for example: Johansson 1