{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.777","julian_year":2026.777,"time":"2026-10-11T22:13:32.379Z","years_from_j2000":26.777,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued position is carried along the great circle the object's own published motion puts it on, at a constant velocity, from the epoch that position was measured at, 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. The motion runs from position_epoch_jyear where the upstream publishes one — a timed pulsar's position belongs to the year it was timed — and from J2000 where it does not. 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-10700","name":"52 τ Cet","class":"g8v_yellow_main_sequence_star","category":"star","object_type":"G8V yellow main-sequence star","mag":3.49,"mag_band":"V","abs_mag":5.678,"abs_mag_band":"V","distance_ly":11.905360099416567,"distance_method":"parallax","ra_deg":26.017185,"dec_deg":-15.93748,"epoch_ra_deg":26.330764,"epoch_dec_deg":-15.795543,"epoch_moved_arcsec":51.466,"pm_ra_mas_yr":-1721.82,"pm_dec_mas_yr":854.07,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cetus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-10700","source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0","attribution":"HYG Database v4.1, Astronexus (github.com/astronexus/HYG-Database). Fields derived from it stay under CC BY-SA 4.0.","commercial_use":"allowed"},"radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"01441-1556","companions":[{"measured":2016,"magnitude":13.95,"components":null,"discoverer_code":"BUP  25","separation_arcsec":160.5,"position_angle_deg":150}],"spectral_type":"G8V","uncertainties":{"metallicity_fe_h":[0.091,0.091]},"color_index_bv":0.727,"luminosity_solar":0.46644452520377955,"metallicity_fe_h":-0.52,"radial_velocity_km_s":-17,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","surface_gravity_log_g":4.52,"surface_temperature_k":5340,"metallicity_fe_h_source":"Median of 44 spectroscopic determinations in 51 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-1721.82,"proper_motion_dec_mas_yr":854.07,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"52 Tau Cet"},{"catalog":"Exoplanet host","designation":"τ Cet"},{"catalog":"Gliese","designation":"Gl 71"},{"catalog":"HD","designation":"HD 10700"},{"catalog":"HIP","designation":"HIP 8102"},{"catalog":"HR","designation":"HR 509"}],"updated_at":"2026-10-01T09:42:28.932Z","attribution":"Data from SpaceCatalog.org. Each record names its upstream in `source`, with that producer's terms in `source.license`, the acknowledgement it asks for in `source.attribution`, and whether its terms allow commercial use in `source.commercial_use`; those terms govern the record, and citing SpaceCatalog does not discharge them."}