{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T12:46:50.125Z","years_from_j2000":26.667,"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-2829","name":"IC 2829","class":"spiral_galaxy_sa","category":"galaxy","object_type":"Spiral galaxy Sa","mag":15.66,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":798640633.6509511,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":171.81241666666665,"dec_deg":10.32236111111111,"epoch_ra_deg":172.160583,"epoch_dec_deg":10.174681,"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","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-2829","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.66,"h_mag":11.62,"j_mag":12.4,"k_mag":11.28,"redshift":0.05368,"hubble_type":"Sa","wikidata_id":"Q3688589","redshift_cmb":0.054918333170299594,"ngc_type_code":"G","uncertainties":{"distance_ly":[35311843.27535685,35311843.27535685]},"major_axis_arcmin":0.88,"minor_axis_arcmin":0.52,"position_angle_deg":175,"surface_brightness":23.93,"radial_velocity_km_s":15662},"designations":[{"catalog":"2MASX","designation":"2MASX J11271496+1019207"},{"catalog":"IC","designation":"IC 2829"},{"catalog":"LEDA","designation":"LEDA 35226"},{"catalog":"PGC","designation":"PGC 35226"},{"catalog":"SDSS","designation":"SDSS J112714.97+101920.4"},{"catalog":"SDSS","designation":"SDSS J112714.98+101920.5"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}