{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T03:58:05.665Z","years_from_j2000":26.674,"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-284","name":"NGC 284","class":"elliptical_galaxy_e","category":"galaxy","object_type":"Elliptical galaxy E","mag":15.93,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":548126925.0550163,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":13.351125,"dec_deg":-13.158861111111111,"epoch_ra_deg":13.6876,"epoch_dec_deg":-13.012964,"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":"Cetus","discovered":"1886","featured":false,"url":"https://spacecatalog.org/object/ngc-284","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.93,"h_mag":11.57,"j_mag":12.25,"k_mag":11.17,"redshift":0.039229,"hubble_type":"E","wikidata_id":"Q1036011","redshift_cmb":0.038144993403975036,"discovered_by":"Francis Preserved Leavenworth","ngc_type_code":"G","uncertainties":{"distance_ly":[26350923.33465421,26350923.33465421]},"major_axis_arcmin":0.62,"minor_axis_arcmin":0.55,"wikipedia_article":"NGC 284","position_angle_deg":142,"surface_brightness":23.6,"radial_velocity_km_s":11530},"designations":[{"catalog":"2MASX","designation":"2MASX J00532423-1309321"},{"catalog":"MCG","designation":"MCG -02-03-032"},{"catalog":"NGC","designation":"NGC 284"},{"catalog":"PGC","designation":"PGC 3131"},{"catalog":"PGC","designation":"PGC 3132"}],"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."}