{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T20:43:42.207Z","years_from_j2000":26.681,"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-5815","name":"NGC 5815","class":"spiral_galaxy_sb","category":"galaxy","object_type":"Spiral galaxy Sb","mag":14.43,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":150170873.37718573,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":225.1220416666667,"dec_deg":-16.834305555555556,"epoch_ra_deg":225.498057,"epoch_dec_deg":-16.941123,"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":"Libra","discovered":"1886","featured":false,"url":"https://spacecatalog.org/object/ngc-5815","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.43,"h_mag":11.34,"j_mag":11.96,"k_mag":11.06,"redshift":0.009979,"hubble_type":"Sb","wikidata_id":"Q1123172","redshift_cmb":0.010664220329830387,"discovered_by":"Francis Preserved Leavenworth","ngc_type_code":"G","uncertainties":{"distance_ly":[15335242.67082659,15335242.67082659]},"major_axis_arcmin":0.78,"minor_axis_arcmin":0.26,"position_angle_deg":5,"surface_brightness":22.59,"radial_velocity_km_s":2977},"designations":[{"catalog":"2MASX","designation":"2MASX J15002929-1650035"},{"catalog":"IRAS","designation":"IRAS 14576-1638"},{"catalog":"IRAS","designation":"IRAS F14577-1638"},{"catalog":"LEDA","designation":"LEDA 53600"},{"catalog":"MCG","designation":"MCG -03-38-044"},{"catalog":"NGC","designation":"NGC 5815"},{"catalog":"PGC","designation":"PGC 53600"}],"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."}