{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T22:06:44.560Z","years_from_j2000":26.676,"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-81485","name":"HD 81485","class":"g7v_k0ive_yellow_main_sequence_star","category":"star","object_type":"G7V+K0IVe yellow main-sequence star","mag":8,"mag_band":"V","abs_mag":4.228,"abs_mag_band":"V","distance_ly":185.3161830038547,"distance_method":"parallax","ra_deg":139.853745,"dec_deg":-77.643432,"epoch_ra_deg":139.743496,"epoch_dec_deg":-77.755632,"epoch_moved_arcsec":3.425,"pm_ra_mas_yr":-107.36,"pm_dec_mas_yr":70.4,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Chamaeleon","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-81485","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"09194-7739","companions":[{"measured":2025,"magnitude":10.1,"components":"Aa,Ab","discoverer_code":"KOH  83","separation_arcsec":0.1,"position_angle_deg":92},{"measured":2023,"magnitude":9.66,"components":"AB","discoverer_code":"HJ 4214","separation_arcsec":8.9,"position_angle_deg":195}],"spectral_type":"G7V+K0IVe","color_index_bv":0.725,"luminosity_solar":1.7733726245425578,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2006A&A...460..695T, quality C)","surface_temperature_k":5730,"proper_motion_ra_mas_yr":-107.36,"proper_motion_dec_mas_yr":70.4,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 81485"},{"catalog":"HIP","designation":"HIP 45734"}],"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."}