{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T01:11:15.813Z","years_from_j2000":26.671,"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-87188","name":"HD 87188","class":"f0v_yellow_white_main_sequence_star","category":"star","object_type":"F0V yellow-white main-sequence star","mag":9.01,"mag_band":"V","abs_mag":1.68,"abs_mag_band":"V","distance_ly":953.6737468470702,"distance_method":"parallax","ra_deg":150.58797,"dec_deg":-43.138511,"epoch_ra_deg":150.861284,"epoch_dec_deg":-43.267706,"epoch_moved_arcsec":0.54,"pm_ra_mas_yr":-17.92,"pm_dec_mas_yr":9.43,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Vela","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-87188","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":1308509600,"mass_solar":1.671,"radius_solar":2.161,"spectral_type":"F0V","color_index_bv":0.324,"luminosity_solar":18.535316234148105,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality C)","surface_gravity_log_g":3.958,"surface_temperature_k":7163,"proper_motion_ra_mas_yr":-17.92,"proper_motion_dec_mas_yr":9.43,"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":10.7224},"designations":[{"catalog":"HD","designation":"HD 87188"},{"catalog":"HIP","designation":"HIP 49187"}],"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."}