{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T11:53:58.434Z","years_from_j2000":26.672,"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-1658","name":"HD 1658","class":"b8_5v_blue_white_main_sequence_star","category":"star","object_type":"B8.5V blue-white main-sequence star","mag":7.23,"mag_band":"V","abs_mag":1.135,"abs_mag_band":"V","distance_ly":539.9939574827943,"distance_method":"parallax","ra_deg":5.342445,"dec_deg":67.005408,"epoch_ra_deg":5.715642,"epoch_dec_deg":67.154411,"epoch_moved_arcsec":0.686,"pm_ra_mas_yr":25.67,"pm_dec_mas_yr":-1.69,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cepheus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-1658","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00214+6700","companions":[{"measured":2021,"magnitude":8.77,"components":"AB","discoverer_code":"STT   6","separation_arcsec":0.7,"position_angle_deg":153},{"measured":2020,"magnitude":9.92,"components":"AB,C","discoverer_code":"STF  26","separation_arcsec":13.1,"position_angle_deg":115}],"spectral_type":"B8.5V","color_index_bv":0.01,"luminosity_solar":30.61963433690677,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (quality D)","proper_motion_ra_mas_yr":25.67,"proper_motion_dec_mas_yr":-1.69},"designations":[{"catalog":"HD","designation":"HD 1658"},{"catalog":"HIP","designation":"HIP 1700"}],"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."}