{"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":"2026-09-02T07:42:31.395Z","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":"hip-101798","name":"HIP 101798","class":"star","category":"star","object_type":null,"mag":9.94,"mag_band":"V","abs_mag":4.48,"abs_mag_band":"V","distance_ly":403.1599415574002,"distance_method":"parallax","ra_deg":309.45375,"dec_deg":29.736855,"epoch_ra_deg":309.731043,"epoch_dec_deg":29.830194,"epoch_moved_arcsec":0.542,"pm_ra_mas_yr":5.9,"pm_dec_mas_yr":-19.45,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-101798","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20378+2943","age_years":2984730700,"companions":[{"measured":2016,"magnitude":10.9,"components":"BC","discoverer_code":"A   742","separation_arcsec":1.2,"position_angle_deg":132}],"mass_solar":1.375,"radius_solar":1.897,"luminosity_solar":1.4060475241299129,"variable_mag_max":9.878,"variable_mag_min":10.018,"radial_velocity_km_s":0,"surface_gravity_log_g":3.867,"surface_temperature_k":6534,"proper_motion_ra_mas_yr":5.9,"proper_motion_dec_mas_yr":-19.45,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":5.0257},"designations":[{"catalog":"HIP","designation":"HIP 101798"}],"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."}