{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T17:57:53.777Z","years_from_j2000":26.67,"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-77104","name":"66 Cnc","class":"a2v_white_main_sequence_star","category":"star","object_type":"A2V white main-sequence star","mag":5.89,"mag_band":"V","abs_mag":0.112,"abs_mag_band":"V","distance_ly":466.6042063072389,"distance_method":"parallax","ra_deg":135.350535,"dec_deg":32.252296,"epoch_ra_deg":135.761503,"epoch_dec_deg":32.147197,"epoch_moved_arcsec":0.021,"pm_ra_mas_yr":0.3,"pm_dec_mas_yr":0.72,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cancer","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-77104","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"09014+3215","age_years":505506750,"companions":[{"measured":2021,"magnitude":8.56,"components":"AB","discoverer_code":"STF1298","separation_arcsec":4.5,"position_angle_deg":135},{"measured":2017,"magnitude":12.01,"components":"AC","discoverer_code":"STF1298","separation_arcsec":186.8,"position_angle_deg":319}],"mass_solar":2.563,"radius_solar":4.047,"spectral_type":"A2V","color_index_bv":0.088,"luminosity_solar":78.55973322609896,"radial_velocity_km_s":-13,"spectral_type_source":"SIMBAD (2007A&A...463..671R, quality D)","surface_gravity_log_g":3.557,"surface_temperature_k":8807,"proper_motion_ra_mas_yr":0.3,"proper_motion_dec_mas_yr":0.72,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate","bolometric_luminosity_solar":69.9221},"designations":[{"catalog":"Bayer/Flamsteed","designation":"66 Cnc"},{"catalog":"HD","designation":"HD 77104"},{"catalog":"HIP","designation":"HIP 44307"},{"catalog":"HR","designation":"HR 3587"}],"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."}