{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T11:55:45.625Z","years_from_j2000":26.669,"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":"hd-77321","name":"HD 77321","class":"k1_2ii_orange_bright_giant","category":"star","object_type":"K1/2II orange bright giant","mag":6.88,"mag_band":"V","abs_mag":-2.421,"abs_mag_band":"V","distance_ly":2363.452073889922,"distance_method":"parallax","ra_deg":135.00453,"dec_deg":-49.557967,"epoch_ra_deg":135.222489,"epoch_dec_deg":-49.662187,"epoch_moved_arcsec":0.391,"pm_ra_mas_yr":-12.6,"pm_dec_mas_yr":7.46,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Vela","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-77321","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"09000-4933","companions":[{"measured":2019,"magnitude":9.73,"components":null,"discoverer_code":"GLI 104","separation_arcsec":9.1,"position_angle_deg":308}],"radius_solar":64.037,"spectral_type":"K1/2II","color_index_bv":1.32,"luminosity_solar":809.841447325789,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality D)","surface_gravity_log_g":1.558,"surface_temperature_k":4752,"proper_motion_ra_mas_yr":-12.6,"proper_motion_dec_mas_yr":7.46,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)"},"designations":[{"catalog":"HD","designation":"HD 77321"},{"catalog":"HIP","designation":"HIP 44181"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","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."}