{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T03:20:50.529Z","years_from_j2000":26.679,"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-2770","name":"NGC 2770","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":12.21,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":101785704.58508818,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":137.39045833333333,"dec_deg":33.12352777777778,"epoch_ra_deg":137.801412,"epoch_dec_deg":33.014643,"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":"Lynx","discovered":"1785","featured":false,"url":"https://spacecatalog.org/object/ngc-2770","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.76,"h_mag":9.81,"j_mag":10.52,"k_mag":9.57,"v_mag":12.21,"redshift":0.00644,"hubble_type":"Sc","wikidata_id":"Q817161","redshift_cmb":0.007246833136657971,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14641198.403696641,14641198.403696641]},"major_axis_arcmin":3.45,"minor_axis_arcmin":0.81,"wikipedia_article":"NGC 2770","position_angle_deg":146,"surface_brightness":23.02,"radial_velocity_km_s":1924},"designations":[{"catalog":"2MASX","designation":"2MASX J09093362+3307242"},{"catalog":"IRAS","designation":"IRAS 09065+3319"},{"catalog":"IRAS","designation":"IRAS F09064+3319"},{"catalog":"LEDA","designation":"LEDA 25806"},{"catalog":"MCG","designation":"MCG +06-20-038"},{"catalog":"NGC","designation":"NGC 2770"},{"catalog":"PGC","designation":"PGC 25806"},{"catalog":"SDSS","designation":"SDSS J090933.70+330724.6"},{"catalog":"SDSS","designation":"SDSS J090933.70+330724.7"},{"catalog":"SDSS","designation":"SDSS J090933.71+330724.7"},{"catalog":"UGC","designation":"UGC 4806"}],"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."}