{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T02:32:30.987Z","years_from_j2000":26.666,"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-1536","name":"IC 1536","class":"elliptical_galaxy_e","category":"galaxy","object_type":"Elliptical galaxy E","mag":15.53,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":230010633.72620577,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":3.5792083333333338,"dec_deg":48.143277777777776,"epoch_ra_deg":3.93155,"epoch_dec_deg":48.292567,"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":"Andromeda","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-1536","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.53,"h_mag":11.08,"j_mag":11.88,"k_mag":10.84,"redshift":0.017179,"hubble_type":"E","wikidata_id":"Q3693757","redshift_cmb":0.01626563422955729,"ngc_type_code":"G","uncertainties":{"distance_ly":[16914587.98839952,16914587.98839952]},"major_axis_arcmin":0.81,"minor_axis_arcmin":0.53,"position_angle_deg":172,"surface_brightness":23.85,"radial_velocity_km_s":5106},"designations":[{"catalog":"2MASX","designation":"2MASX J00141901+4808355"},{"catalog":"IC","designation":"IC 1536"},{"catalog":"LEDA","designation":"LEDA 949"},{"catalog":"Markarian","designation":"Mrk 939"},{"catalog":"MCG","designation":"MCG +08-01-032"},{"catalog":"PGC","designation":"PGC 949"}],"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."}