{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T02:58:43.817Z","years_from_j2000":26.685,"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-108847","name":"HD 108847","class":"k4v_orange_dwarf","category":"star","object_type":"K4V orange dwarf","mag":9.08,"mag_band":"V","abs_mag":6.696,"abs_mag_band":"V","distance_ly":97.768635784371,"distance_method":"parallax","ra_deg":187.57339499999998,"dec_deg":30.994368,"epoch_ra_deg":187.906672,"epoch_dec_deg":30.846462,"epoch_moved_arcsec":2.467,"pm_ra_mas_yr":-35.49,"pm_dec_mas_yr":85.36,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Coma Berenices","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-108847","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":12440877000,"mass_solar":0.763,"radius_solar":0.793,"spectral_type":"K4V","color_index_bv":1.015,"luminosity_solar":0.18264172487743538,"radial_velocity_km_s":12.3,"spectral_type_source":"SIMBAD (1997JApA...18..161Y, quality C)","surface_gravity_log_g":4.547,"surface_temperature_k":4756,"proper_motion_ra_mas_yr":-35.49,"proper_motion_dec_mas_yr":85.36,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.2891},"designations":[{"catalog":"HD","designation":"HD 108847"},{"catalog":"HIP","designation":"HIP 61016"}],"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."}