{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T17:02:56.929Z","years_from_j2000":26.684,"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-2922","name":"NGC 2922","class":"spiral_galaxy_sm","category":"galaxy","object_type":"Spiral galaxy Sm","mag":13.64,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":216963957.47736156,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":144.218625,"dec_deg":37.69488888888888,"epoch_ra_deg":144.631435,"epoch_dec_deg":37.574565,"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":"Leo Minor","discovered":"1884","featured":false,"url":"https://spacecatalog.org/object/ngc-2922","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.43,"h_mag":11.17,"j_mag":11.87,"k_mag":10.87,"v_mag":13.64,"redshift":0.014546,"hubble_type":"Sm","wikidata_id":"Q1101876","redshift_cmb":0.015353453570843278,"discovered_by":"Édouard Stephan","ngc_type_code":"G","uncertainties":{"distance_ly":[16624284.947880212,16624284.947880212]},"major_axis_arcmin":1.07,"minor_axis_arcmin":0.45,"position_angle_deg":99,"surface_brightness":22.61,"radial_velocity_km_s":4329},"designations":[{"catalog":"2MASX","designation":"2MASX J09365245+3741411"},{"catalog":"IRAS","designation":"IRAS 09337+3755"},{"catalog":"IRAS","designation":"IRAS F09338+3755"},{"catalog":"LEDA","designation":"LEDA 27361"},{"catalog":"MCG","designation":"MCG +06-21-057"},{"catalog":"NGC","designation":"NGC 2922"},{"catalog":"PGC","designation":"PGC 27361"},{"catalog":"SDSS","designation":"SDSS J093652.46+374141.6"},{"catalog":"SDSS","designation":"SDSS J093652.47+374141.6"},{"catalog":"UGC","designation":"UGC 5118"}],"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."}