{"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":"2026-08-27T17:42:16.675Z","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":"algorab","name":"Algorab","class":"a0iv_n_kb9_white_subgiant","category":"star","object_type":"A0IV(n)kB9 white subgiant","mag":2.94,"mag_band":"V","abs_mag":0.813,"abs_mag_band":"V","distance_ly":86.85935726250138,"distance_method":"parallax","ra_deg":187.466085,"dec_deg":-16.515432,"epoch_ra_deg":187.813643,"epoch_dec_deg":-16.664888,"epoch_moved_arcsec":6.716,"pm_ra_mas_yr":-209.97,"pm_dec_mas_yr":-139.3,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Corvus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/algorab","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"12299-1631","companions":[{"measured":2020,"magnitude":8.47,"components":"AB","discoverer_code":"SHJ 145","separation_arcsec":24.2,"position_angle_deg":216}],"spectral_type":"A0IV(n)kB9","color_index_bv":-0.012,"luminosity_solar":41.19077848677376,"radial_velocity_km_s":9,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","proper_motion_ra_mas_yr":-209.97,"proper_motion_dec_mas_yr":-139.3},"designations":[{"catalog":"Bayer/Flamsteed","designation":"7 Delta Crv"},{"catalog":"Common name","designation":"Algorab"},{"catalog":"HD","designation":"HD 108767"},{"catalog":"HIP","designation":"HIP 60965"},{"catalog":"HR","designation":"HR 4757"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T16:03:54.983Z","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."}