{"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":"2026-09-04T03:18:12.370Z","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-3756","name":"NGC 3756","class":"intermediate_spiral_galaxy_sabb","category":"galaxy","object_type":"Intermediate spiral galaxy SABb","mag":11.52,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":68445515.14907143,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":174.20008333333334,"dec_deg":54.29355555555556,"epoch_ra_deg":174.567628,"epoch_dec_deg":54.144994,"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":"Ursa Major","discovered":"1789","featured":false,"url":"https://spacecatalog.org/object/ngc-3756","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.08,"h_mag":9.06,"j_mag":9.69,"k_mag":8.78,"v_mag":11.52,"redshift":0.00429,"hubble_type":"SABb","wikidata_id":"Q965134","redshift_cmb":0.0048818404943746785,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14298528.436997758,14298528.436997758]},"major_axis_arcmin":1.91,"minor_axis_arcmin":0.97,"wikipedia_article":"NGC 3756","position_angle_deg":179,"surface_brightness":21.69,"radial_velocity_km_s":1283},"designations":[{"catalog":"2MASX","designation":"2MASX J11364797+5417372"},{"catalog":"IRAS","designation":"IRAS 11340+5434"},{"catalog":"LEDA","designation":"LEDA 35931"},{"catalog":"MCG","designation":"MCG +09-19-134"},{"catalog":"NGC","designation":"NGC 3756"},{"catalog":"PGC","designation":"PGC 35931"},{"catalog":"SDSS","designation":"SDSS J113648.01+541736.7"},{"catalog":"SDSS","designation":"SDSS J113648.01+541736.8"},{"catalog":"SDSS","designation":"SDSS J113648.02+541736.8"},{"catalog":"SDSS","designation":"SDSS J113648.72+541731.4"},{"catalog":"SDSS","designation":"SDSS J113648.73+541731.5"},{"catalog":"UGC","designation":"UGC 6579"}],"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."}