{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T17:42:11.682Z","years_from_j2000":26.654,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"ic-2501","name":"IC 2501","class":"planetary_nebula","category":"nebula","object_type":"Planetary nebula","mag":10.4,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":144.6965833333333,"dec_deg":-60.091861111111115,"epoch_ra_deg":144.887079,"epoch_dec_deg":-60.212634,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Carina","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-2501","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":11.3,"h_mag":10.24,"j_mag":10.39,"k_mag":9.24,"v_mag":10.4,"redshift":0.000109,"wikidata_id":"Q3689766","ngc_type_code":"PN","major_axis_arcmin":0.03,"radial_velocity_km_s":33},"designations":[{"catalog":"2MASX","designation":"2MASX J09384714-6005305"},{"catalog":"ESO","designation":"ESO 126-026"},{"catalog":"ESO","designation":"ESO 126-26"},{"catalog":"HD","designation":"HD 83832"},{"catalog":"IC","designation":"IC 2501"},{"catalog":"IRAS","designation":"IRAS 09373-5951"},{"catalog":"PK","designation":"PK 281-05 1"},{"catalog":"PN","designation":"PN G281.0-05.6"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T16:03:54.983Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}