{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T09:41:48.430Z","years_from_j2000":26.666,"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-33725","name":"HD 33725","class":"g9v_yellow_main_sequence_star","category":"star","object_type":"G9V yellow main-sequence star","mag":8.04,"mag_band":"V","abs_mag":5.784,"abs_mag_band":"V","distance_ly":92.18679553612667,"distance_method":"parallax","ra_deg":77.97603,"dec_deg":-9.113155,"epoch_ra_deg":78.296115,"epoch_dec_deg":-9.084294,"epoch_moved_arcsec":15.008,"pm_ra_mas_yr":-72.33,"pm_dec_mas_yr":-558.12,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Orion","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-33725","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05119-0907","age_years":13361320000,"companions":[{"measured":2016,"magnitude":9.86,"components":null,"discoverer_code":"BUP  76","separation_arcsec":85.9,"position_angle_deg":260}],"mass_solar":0.816,"radius_solar":0.857,"spectral_type":"G9V","uncertainties":{"metallicity_fe_h":[0.039,0.039]},"color_index_bv":0.799,"luminosity_solar":0.42305808577652315,"metallicity_fe_h":-0.145,"radial_velocity_km_s":5.6,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":4.483,"surface_temperature_k":5182,"metallicity_fe_h_source":"Median of 4 spectroscopic determinations in 4 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-72.33,"proper_motion_dec_mas_yr":-558.12,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.4723},"designations":[{"catalog":"HD","designation":"HD 33725"},{"catalog":"HIP","designation":"HIP 24210"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}