{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T19:44:02.186Z","years_from_j2000":26.665,"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-1237","name":"HD 1237","class":"g8v_yellow_main_sequence_star","category":"star","object_type":"G8V yellow main-sequence star","mag":6.59,"mag_band":"V","abs_mag":5.375,"abs_mag_band":"V","distance_ly":57.07019066012033,"distance_method":"parallax","ra_deg":4.0479,"dec_deg":-79.851182,"epoch_ra_deg":4.362051,"epoch_dec_deg":-79.702388,"epoch_moved_arcsec":11.672,"pm_ra_mas_yr":433.87,"pm_dec_mas_yr":-57.95,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hydrus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-1237","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"mass_solar":0.848,"radius_solar":0.927,"spectral_type":"G8V","uncertainties":{"metallicity_fe_h":[0.034,0.034]},"color_index_bv":0.749,"luminosity_solar":0.616595001861482,"metallicity_fe_h":0.115,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2006A&A...460..695T, quality C)","surface_gravity_log_g":4.44,"surface_temperature_k":5367,"metallicity_fe_h_source":"Median of 14 spectroscopic determinations in 14 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":433.87,"proper_motion_dec_mas_yr":-57.95,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.6461},"designations":[{"catalog":"Gliese","designation":"GJ 3021"},{"catalog":"HD","designation":"HD 1237"},{"catalog":"HIP","designation":"HIP 1292"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}