{"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":"2026-09-07T13:29:42.832Z","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":"hd-41116","name":"1 Gem","class":"g5iii_yellow_giant","category":"star","object_type":"G5III yellow giant","mag":4.16,"mag_band":"V","abs_mag":0.774,"abs_mag_band":"V","distance_ly":155.09094532446636,"distance_method":"parallax","ra_deg":91.03006500000001,"dec_deg":23.263341,"epoch_ra_deg":91.43861,"epoch_dec_deg":23.261533,"epoch_moved_arcsec":3.195,"pm_ra_mas_yr":-2.6,"pm_dec_mas_yr":-119.72,"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-41116","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06041+2316","companions":[{"measured":2023,"magnitude":5.5,"components":"AB","discoverer_code":"KUI  23","separation_arcsec":0.1,"position_angle_deg":36},{"measured":2017,"magnitude":13.5,"components":"AC","discoverer_code":"BU 1405","separation_arcsec":105.7,"position_angle_deg":25}],"spectral_type":"G5III","uncertainties":{"metallicity_fe_h":[0.032,0.032]},"color_index_bv":0.835,"luminosity_solar":42.69725940480335,"metallicity_fe_h":0.04,"radial_velocity_km_s":20,"spectral_type_source":"SIMBAD (1998A&A...338..623M, quality D)","surface_gravity_log_g":3.18,"surface_temperature_k":5125,"metallicity_fe_h_source":"Median of 3 spectroscopic determinations in 3 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-2.6,"proper_motion_dec_mas_yr":-119.72,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"1 Gem"},{"catalog":"HD","designation":"HD 41116"},{"catalog":"HIP","designation":"HIP 28734"},{"catalog":"HR","designation":"HR 2134"}],"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."}