{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T23:37:26.150Z","years_from_j2000":26.673,"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-76813","name":"64 σ³ Cnc","class":"g9iii_yellow_giant","category":"star","object_type":"G9III yellow giant","mag":5.23,"mag_band":"V","abs_mag":0.443,"abs_mag_band":"V","distance_ly":295.6992428527985,"distance_method":"parallax","ra_deg":134.886075,"dec_deg":32.418559,"epoch_ra_deg":135.29768,"epoch_dec_deg":32.314039,"epoch_moved_arcsec":1.5,"pm_ra_mas_yr":-44.33,"pm_dec_mas_yr":-34.61,"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-76813","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08595+3225","age_years":413552400,"companions":[{"measured":2013,"magnitude":8.97,"components":"AB","discoverer_code":"SHJ 100","separation_arcsec":90.3,"position_angle_deg":294}],"mass_solar":2.9,"radius_solar":10.584,"spectral_type":"G9III","uncertainties":{"metallicity_fe_h":[0.289,0.289]},"color_index_bv":0.913,"luminosity_solar":57.91619210831198,"metallicity_fe_h":-0.035,"radial_velocity_km_s":23,"spectral_type_source":"SIMBAD (1990A&AS...85.1069S, quality C)","surface_gravity_log_g":2.76,"surface_temperature_k":5128,"metallicity_fe_h_source":"Median of 8 spectroscopic determinations in 9 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-44.33,"proper_motion_dec_mas_yr":-34.61,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":72.3596},"designations":[{"catalog":"Bayer/Flamsteed","designation":"64 Sigma3 Cnc"},{"catalog":"HD","designation":"HD 76813"},{"catalog":"HIP","designation":"HIP 44154"},{"catalog":"HR","designation":"HR 3575"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","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."}