{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T04:50:57.168Z","years_from_j2000":26.674,"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-35369","name":"29 Ori","class":"g8_iii_yellow_star","category":"star","object_type":"G8+III yellow star","mag":4.13,"mag_band":"V","abs_mag":0.713,"abs_mag_band":"V","distance_ly":157.335553515913,"distance_method":"parallax","ra_deg":80.986785,"dec_deg":-7.808065,"epoch_ra_deg":81.310588,"epoch_dec_deg":-7.783129,"epoch_moved_arcsec":1.251,"pm_ra_mas_yr":-13.91,"pm_dec_mas_yr":-44.8,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Orion","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-35369","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"G8+III","uncertainties":{"metallicity_fe_h":[0.074,0.074]},"color_index_bv":0.943,"luminosity_solar":45.16479049291119,"metallicity_fe_h":-0.17,"radial_velocity_km_s":-18,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","surface_gravity_log_g":2.76,"surface_temperature_k":4931,"metallicity_fe_h_source":"Median of 9 spectroscopic determinations in 10 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-13.91,"proper_motion_dec_mas_yr":-44.8,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"29 Ori"},{"catalog":"HD","designation":"HD 35369"},{"catalog":"HIP","designation":"HIP 25247"},{"catalog":"HR","designation":"HR 1784"}],"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."}