{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T08:55:30.656Z","years_from_j2000":26.68,"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-3084","name":"NGC 3084","class":"spiral_galaxy_sab","category":"galaxy","object_type":"Spiral galaxy Sab","mag":13.2,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":132507277.92954549,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":149.77675,"dec_deg":-27.128805555555555,"epoch_ra_deg":150.08143,"epoch_dec_deg":-27.257083,"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":"Antlia","discovered":"1835","featured":false,"url":"https://spacecatalog.org/object/ngc-3084","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.2,"h_mag":9.76,"j_mag":10.44,"k_mag":9.43,"redshift":0.008306,"hubble_type":"Sab","wikidata_id":"Q1102861","redshift_cmb":0.009418678630764177,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15056376.12349095,15056376.12349095]},"major_axis_arcmin":1.66,"minor_axis_arcmin":1.23,"position_angle_deg":100,"surface_brightness":22.88,"radial_velocity_km_s":2480},"designations":[{"catalog":"2MASX","designation":"2MASX J09590643-2707438"},{"catalog":"ESO","designation":"ESO 499-029"},{"catalog":"ESO","designation":"ESO 499-29"},{"catalog":"ESO-LV","designation":"ESO-LV 499-0290"},{"catalog":"IC","designation":"IC 2528"},{"catalog":"LEDA","designation":"LEDA 28841"},{"catalog":"MCG","designation":"MCG -04-24-010"},{"catalog":"NGC","designation":"NGC 3084"},{"catalog":"PGC","designation":"PGC 28841"}],"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."}