{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T21:57:42.287Z","years_from_j2000":26.654,"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-3165","name":"HD 3165","class":"g8iii_iv_yellow_giant","category":"star","object_type":"G8III-IV yellow giant","mag":6.58,"mag_band":"V","abs_mag":-0.493,"abs_mag_band":"V","distance_ly":847.1595539506025,"distance_method":"parallax","ra_deg":8.790075,"dec_deg":36.832233,"epoch_ra_deg":9.149615,"epoch_dec_deg":36.980092,"epoch_moved_arcsec":0.693,"pm_ra_mas_yr":-20.36,"pm_dec_mas_yr":-16.14,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Andromeda","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-3165","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00352+3650","companions":[{"measured":2018,"magnitude":8.48,"components":"AB","discoverer_code":"STF  40","separation_arcsec":11.8,"position_angle_deg":312},{"measured":2015,"magnitude":12.8,"components":"AC","discoverer_code":"STF  40","separation_arcsec":25.4,"position_angle_deg":121}],"spectral_type":"G8III-IV","color_index_bv":1.445,"luminosity_solar":137.15132259364853,"radial_velocity_km_s":-11.5,"spectral_type_source":"SIMBAD (quality D)","proper_motion_ra_mas_yr":-20.36,"proper_motion_dec_mas_yr":-16.14},"designations":[{"catalog":"HD","designation":"HD 3165"},{"catalog":"HIP","designation":"HIP 2753"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T19:16:43.430Z","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."}