{"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":"2026-09-04T07:54:14.888Z","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":"ic4151-ned01","name":"IC4151 NED01","class":"spiral_galaxy_sbc","category":"galaxy","object_type":"Spiral galaxy Sbc","mag":17.58,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":1087256156.9001718,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":195.99616666666668,"dec_deg":36.85802777777778,"epoch_ra_deg":196.3108,"epoch_dec_deg":36.713786,"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":null,"featured":false,"url":"https://spacecatalog.org/object/ic4151-ned01","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":17.58,"h_mag":13.77,"j_mag":14.33,"k_mag":13.28,"redshift":0.07296,"hubble_type":"Sbc","redshift_cmb":0.07379175628392254,"ngc_type_code":"G","uncertainties":{"distance_ly":[46215937.16071426,46215937.16071426]},"major_axis_arcmin":0.47,"minor_axis_arcmin":0.23,"position_angle_deg":8,"surface_brightness":24.11,"radial_velocity_km_s":21077},"designations":[{"catalog":"2MASX","designation":"2MASX J13035913+3651297"},{"catalog":"OpenNGC","designation":"IC4151 NED01"},{"catalog":"PGC","designation":"PGC 4581622"},{"catalog":"SDSS","designation":"SDSS J130359.07+365128.7"},{"catalog":"SDSS","designation":"SDSS J130359.07+365128.8"}],"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."}