{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T21:07:11.965Z","years_from_j2000":26.654,"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-2801","name":"NGC 2801","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":15.3,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":381111044.9730067,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":139.18412500000002,"dec_deg":19.93572222222222,"epoch_ra_deg":139.563891,"epoch_dec_deg":19.823803,"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":"Cancer","discovered":"1865","featured":false,"url":"https://spacecatalog.org/object/ngc-2801","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.3,"h_mag":12.26,"j_mag":12.87,"k_mag":11.98,"redshift":0.02576,"hubble_type":"Sc","wikidata_id":"Q1051004","redshift_cmb":0.026743008676360702,"discovered_by":"Albert Marth","ngc_type_code":"G","uncertainties":{"distance_ly":[20954551.84583622,20954551.84583622]},"major_axis_arcmin":0.96,"minor_axis_arcmin":0.78,"wikipedia_article":"NGC 2801","position_angle_deg":51,"surface_brightness":23.78,"radial_velocity_km_s":7623},"designations":[{"catalog":"2MASX","designation":"2MASX J09164417+1956087"},{"catalog":"LEDA","designation":"LEDA 26183"},{"catalog":"MCG","designation":"MCG +03-24-025"},{"catalog":"NGC","designation":"NGC 2801"},{"catalog":"PGC","designation":"PGC 26183"},{"catalog":"SDSS","designation":"SDSS J091644.19+195608.5"},{"catalog":"SDSS","designation":"SDSS J091644.19+195608.6"},{"catalog":"UGC","designation":"UGC 4899"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T19:16:43.430Z","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."}