{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T06:56:44.125Z","years_from_j2000":26.683,"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":"hip-10303","name":"HIP 10303","class":"g1v_yellow_main_sequence_star","category":"star","object_type":"G1V yellow main-sequence star","mag":7.56,"mag_band":"V","abs_mag":4.16,"abs_mag_band":"V","distance_ly":156.13040570024964,"distance_method":"parallax","ra_deg":33.194325,"dec_deg":-2.396361,"epoch_ra_deg":33.537997,"epoch_dec_deg":-2.270767,"epoch_moved_arcsec":9.945,"pm_ra_mas_yr":364.13,"pm_dec_mas_yr":-79.61,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cetus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-10303","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":11103171000,"mass_solar":0.92,"radius_solar":1.056,"spectral_type":"G1V","uncertainties":{"metallicity_fe_h":[0.069,0.069]},"color_index_bv":0.716,"luminosity_solar":1.8879913490962925,"metallicity_fe_h":0.104,"radial_velocity_km_s":-5.6,"spectral_type_source":"SIMBAD (1988ApJ...331..922A, quality C)","surface_gravity_log_g":4.332,"surface_temperature_k":5617,"metallicity_fe_h_source":"Median of 7 spectroscopic determinations in 7 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":364.13,"proper_motion_dec_mas_yr":-79.61,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.996},"designations":[{"catalog":"Gliese","designation":"Gl 87.1B"},{"catalog":"HIP","designation":"HIP 10303"}],"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."}