{"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":"2026-09-03T07:09:13.727Z","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-28887","name":"HD 28887","class":"f5_6v_yellow_white_main_sequence_star","category":"star","object_type":"F5/6V yellow-white main-sequence star","mag":8.25,"mag_band":"V","abs_mag":3.626,"abs_mag_band":"V","distance_ly":274.31153838402304,"distance_method":"parallax","ra_deg":67.08861,"dec_deg":-65.711893,"epoch_ra_deg":67.130337,"epoch_dec_deg":-65.65067,"epoch_moved_arcsec":3.517,"pm_ra_mas_yr":24.44,"pm_dec_mas_yr":129.59,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Reticulum","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-28887","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"04284-6543","age_years":3699410700,"companions":[{"measured":2015,"magnitude":9.75,"components":"AB","discoverer_code":"HJ 3662","separation_arcsec":14,"position_angle_deg":120},{"measured":2015,"magnitude":13.7,"components":"AD","discoverer_code":"HJ 3662","separation_arcsec":20.1,"position_angle_deg":43},{"measured":2015,"magnitude":13.14,"components":"AC","discoverer_code":"HJ 3662","separation_arcsec":50.3,"position_angle_deg":194}],"mass_solar":1.209,"radius_solar":1.448,"spectral_type":"F5/6V","color_index_bv":0.477,"luminosity_solar":3.087450475587446,"variable_mag_max":8.211,"variable_mag_min":8.341,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1975MSS...C01....0H, quality D)","surface_gravity_log_g":4.082,"surface_temperature_k":6217,"proper_motion_ra_mas_yr":24.44,"proper_motion_dec_mas_yr":129.59,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":2.8207},"designations":[{"catalog":"HD","designation":"HD 28887"},{"catalog":"HIP","designation":"HIP 20869"}],"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."}