{"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":"2026-09-05T02:31:15.122Z","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-4885","name":"NGC 4885","class":"spiral_galaxy_sab","category":"galaxy","object_type":"Spiral galaxy Sab","mag":14.92,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":172883324.5856203,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":195.141125,"dec_deg":-6.853083333333333,"epoch_ra_deg":195.489785,"epoch_dec_deg":-6.997903,"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":"Virgo","discovered":"1830","featured":false,"url":"https://spacecatalog.org/object/ngc-4885","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.92,"h_mag":11.9,"j_mag":12.38,"k_mag":11.42,"redshift":0.011151,"hubble_type":"Sab","wikidata_id":"Q1115229","redshift_cmb":0.012262403042968106,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15733870.177251441,15733870.177251441]},"major_axis_arcmin":0.85,"minor_axis_arcmin":0.66,"position_angle_deg":100,"surface_brightness":23.13,"radial_velocity_km_s":3324},"designations":[{"catalog":"2MASX","designation":"2MASX J13003387-0651110"},{"catalog":"IRAS","designation":"IRAS 12579-0635"},{"catalog":"LEDA","designation":"LEDA 44781"},{"catalog":"MCG","designation":"MCG -01-33-065"},{"catalog":"NGC","designation":"NGC 4885"},{"catalog":"PGC","designation":"PGC 44781"}],"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."}