{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T17:22:05.429Z","years_from_j2000":26.665,"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-3101","name":"HD 3101","class":"m3iii_red_giant","category":"star","object_type":"M3III red giant","mag":8.01,"mag_band":"V","abs_mag":0.897,"abs_mag_band":"V","distance_ly":862.8476757187779,"distance_method":"parallax","ra_deg":8.52237,"dec_deg":-32.28555,"epoch_ra_deg":8.853695,"epoch_dec_deg":-32.137435,"epoch_moved_arcsec":0.408,"pm_ra_mas_yr":14.98,"pm_dec_mas_yr":3.18,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sculptor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-3101","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00341-3217","companions":[{"measured":2015,"magnitude":12.1,"components":null,"discoverer_code":"RST2247","separation_arcsec":1.1,"position_angle_deg":341}],"spectral_type":"M3III","color_index_bv":1.525,"luminosity_solar":38.124135110429904,"radial_velocity_km_s":2.7,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality C)","proper_motion_ra_mas_yr":14.98,"proper_motion_dec_mas_yr":3.18},"designations":[{"catalog":"HD","designation":"HD 3101"},{"catalog":"HIP","designation":"HIP 2685"}],"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."}