{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T16:43:55.051Z","years_from_j2000":26.684,"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-109000","name":"HD 109000","class":"a8iii_white_giant","category":"star","object_type":"A8III white giant","mag":5.96,"mag_band":"V","abs_mag":1.581,"abs_mag_band":"V","distance_ly":245.0461789242551,"distance_method":"parallax","ra_deg":187.9839,"dec_deg":-63.505838,"epoch_ra_deg":188.365903,"epoch_dec_deg":-63.654043,"epoch_moved_arcsec":1.021,"pm_ra_mas_yr":-28.91,"pm_dec_mas_yr":25.05,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Crux","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-109000","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"12319-6330","age_years":1058016300,"companions":[{"measured":2023,"magnitude":9,"components":null,"discoverer_code":"DSG  15","separation_arcsec":0.1,"position_angle_deg":43}],"mass_solar":1.924,"radius_solar":2.822,"spectral_type":"A8III","color_index_bv":0.263,"luminosity_solar":20.30486002716804,"radial_velocity_km_s":4,"spectral_type_source":"SIMBAD (1975MSS...C01....0H, quality C)","surface_gravity_log_g":3.812,"surface_temperature_k":7328,"proper_motion_ra_mas_yr":-28.91,"proper_motion_dec_mas_yr":25.05,"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":20.5028},"designations":[{"catalog":"HD","designation":"HD 109000"},{"catalog":"HIP","designation":"HIP 61158"},{"catalog":"HR","designation":"HR 4771"}],"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."}