{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T23:04:17.368Z","years_from_j2000":26.668,"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-151","name":"NGC 151","class":"spiral_galaxy_sbc","category":"galaxy","object_type":"Spiral galaxy Sbc","mag":11.66,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":161234622.24726397,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":8.511624999999999,"dec_deg":-9.705333333333332,"epoch_ra_deg":8.852179,"epoch_dec_deg":-9.557231,"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":"Cetus","discovered":"1785","featured":false,"url":"https://spacecatalog.org/object/ngc-151","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.37,"h_mag":8.95,"j_mag":9.55,"k_mag":8.75,"v_mag":11.66,"redshift":0.012562,"hubble_type":"Sbc","wikidata_id":"Q183617","redshift_cmb":0.011443204120635597,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15523970.555855518,15523970.555855518]},"major_axis_arcmin":3.74,"minor_axis_arcmin":2.31,"wikipedia_article":"NGC 151","position_angle_deg":76,"surface_brightness":23.51,"radial_velocity_km_s":3742},"designations":[{"catalog":"2MASX","designation":"2MASX J00340275-0942194"},{"catalog":"IRAS","designation":"IRAS 00315-0958"},{"catalog":"IRAS","designation":"IRAS F00315-0958"},{"catalog":"LEDA","designation":"LEDA 2035"},{"catalog":"MCG","designation":"MCG -02-02-054"},{"catalog":"NGC","designation":"NGC 151"},{"catalog":"NGC","designation":"NGC 153"},{"catalog":"PGC","designation":"PGC 2035"},{"catalog":"SDSS","designation":"SDSS J003402.78-094219.1"},{"catalog":"SDSS","designation":"SDSS J003402.78-094219.2"},{"catalog":"SDSS","designation":"SDSS J003402.79-094219.0"},{"catalog":"SDSS","designation":"SDSS J003402.79-094219.2"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}