{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T18:11:23.901Z","years_from_j2000":26.678,"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-6921","name":"HIP 6921","class":"orange_star","category":"star","object_type":"Orange star","mag":11.71,"mag_band":"V","abs_mag":7.493,"abs_mag_band":"V","distance_ly":227.445150000771,"distance_method":"parallax","ra_deg":22.282095,"dec_deg":-33.735308,"epoch_ra_deg":22.591504,"epoch_dec_deg":-33.595683,"epoch_moved_arcsec":5.856,"pm_ra_mas_yr":207.47,"pm_dec_mas_yr":71.72,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sculptor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-6921","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"01291-3344","companions":[{"measured":2021,"magnitude":14.5,"components":"Aa,Ab","discoverer_code":"GKM9025","separation_arcsec":0.2,"position_angle_deg":313},{"measured":2021,"magnitude":15.9,"components":"AB","discoverer_code":"GKM9025","separation_arcsec":3,"position_angle_deg":4}],"color_index_bv":1.319,"luminosity_solar":0.08765970403212785,"variable_mag_max":11.622,"variable_mag_min":11.782,"radial_velocity_km_s":0,"proper_motion_ra_mas_yr":207.47,"proper_motion_dec_mas_yr":71.72},"designations":[{"catalog":"HIP","designation":"HIP 6921"}],"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."}