{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T21:50:18.718Z","years_from_j2000":26.668,"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-33707","name":"HD 33707","class":"g5_yellow_star","category":"star","object_type":"G5 yellow star","mag":8.51,"mag_band":"V","abs_mag":4.113,"abs_mag_band":"V","distance_ly":247.0882440051396,"distance_method":"parallax","ra_deg":78.214275,"dec_deg":18.154921,"epoch_ra_deg":78.606083,"epoch_dec_deg":18.186866,"epoch_moved_arcsec":1.288,"pm_ra_mas_yr":-11.51,"pm_dec_mas_yr":-46.91,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Taurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-33707","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"G5","uncertainties":{"metallicity_fe_h":[0.01,0.01]},"color_index_bv":0.88,"luminosity_solar":1.9715146109965855,"metallicity_fe_h":0.04,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":3.87,"surface_temperature_k":5092,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 2 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-11.51,"proper_motion_dec_mas_yr":-46.91,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 33707"},{"catalog":"HIP","designation":"HIP 24298"}],"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."}