{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T02:50:14.299Z","years_from_j2000":26.677,"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-4288","name":"NGC 4288","class":"barred_spiral_galaxy_sbcd","category":"galaxy","object_type":"Barred spiral galaxy SBcd","mag":12.91,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":35025253.65954991,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":185.15879166666667,"dec_deg":46.291666666666664,"epoch_ra_deg":185.490822,"epoch_dec_deg":46.142574,"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":"Canes Venatici","discovered":"1788","featured":false,"url":"https://spacecatalog.org/object/ngc-4288","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.3,"h_mag":11.5,"j_mag":11.96,"k_mag":11.3,"v_mag":12.91,"redshift":0.001801,"hubble_type":"SBcd","wikidata_id":"Q1110445","redshift_cmb":0.0025026748858887338,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14075718.082864232,14075718.082864232]},"major_axis_arcmin":1.7,"minor_axis_arcmin":1.35,"position_angle_deg":138,"surface_brightness":22.99,"radial_velocity_km_s":539},"designations":[{"catalog":"2MASX","designation":"2MASX J12203811+4617276"},{"catalog":"LEDA","designation":"LEDA 39840"},{"catalog":"MCG","designation":"MCG +08-23-006"},{"catalog":"NGC","designation":"NGC 4288"},{"catalog":"PGC","designation":"PGC 39840"},{"catalog":"SDSS","designation":"SDSS J122038.14+461730.4"},{"catalog":"SDSS","designation":"SDSS J122038.15+461730.4"},{"catalog":"UGC","designation":"UGC 7399"}],"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."}