{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T10:35:18.823Z","years_from_j2000":26.672,"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-66216","name":"χ Gem","class":"k1_iiib_orange_giant","category":"star","object_type":"K1-IIIb orange giant","mag":4.94,"mag_band":"V","abs_mag":0.464,"abs_mag_band":"V","distance_ly":256.2108378898769,"distance_method":"parallax","ra_deg":120.87951,"dec_deg":27.794332,"epoch_ra_deg":121.291317,"epoch_dec_deg":27.718854,"epoch_moved_arcsec":1.21,"pm_ra_mas_yr":-28.53,"pm_dec_mas_yr":-35.25,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Gemini","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-66216","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08035+2748","companions":[{"measured":2021,"magnitude":12.23,"components":"AB","discoverer_code":"ES 2628","separation_arcsec":57.9,"position_angle_deg":187},{"measured":2021,"magnitude":11.47,"components":"AC","discoverer_code":"ES 2628","separation_arcsec":83.6,"position_angle_deg":79}],"spectral_type":"K1-IIIb","uncertainties":{"metallicity_fe_h":[0.01,0.01]},"color_index_bv":1.13,"luminosity_solar":56.8067574106772,"metallicity_fe_h":0.02,"radial_velocity_km_s":-11,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","surface_gravity_log_g":2.42,"surface_temperature_k":4554,"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":-28.53,"proper_motion_dec_mas_yr":-35.25,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"Chi Gem"},{"catalog":"HD","designation":"HD 66216"},{"catalog":"HIP","designation":"HIP 39424"},{"catalog":"HR","designation":"HR 3149"}],"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."}