{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T21:00:43.876Z","years_from_j2000":26.679,"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":"ngc-6153","name":"NGC 6153","class":"planetary_nebula","category":"nebula","object_type":"Planetary nebula","mag":10.9,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":4833.637517762138,"distance_method":"Statistical distance scale for planetary nebulae (Stanghellini+ 2008)","ra_deg":247.87766666666667,"dec_deg":-40.25344444444445,"epoch_ra_deg":248.33872,"epoch_dec_deg":-40.311327,"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":"Scorpius","discovered":"1883","featured":false,"url":"https://spacecatalog.org/object/ngc-6153","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":11.5,"h_mag":9.93,"j_mag":9.94,"k_mag":9.06,"v_mag":10.9,"redshift":0.00013,"wikidata_id":"Q1900073","discovered_by":"Ralph Copeland","ngc_type_code":"PN","major_axis_arcmin":0.4,"wikipedia_article":"NGC 6153","distance_reference":"NGC 6153","radial_velocity_km_s":39},"designations":[{"catalog":"2MASX","designation":"2MASX J16313062-4015123"},{"catalog":"ESO","designation":"ESO 331-006"},{"catalog":"ESO","designation":"ESO 331-6"},{"catalog":"HD","designation":"HD 148687"},{"catalog":"IRAS","designation":"IRAS 16280-4008"},{"catalog":"NGC","designation":"NGC 6153"},{"catalog":"PN","designation":"PN G341.8+05.4"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","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."}