{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.846","julian_year":2026.846,"time":"2026-11-06T01:37:09.978Z","years_from_j2000":26.846,"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-210460","name":"HD 210460","class":"g1v_yellow_main_sequence_star","category":"star","object_type":"G1V yellow main-sequence star","mag":6.18,"mag_band":"V","abs_mag":2.317,"abs_mag_band":"V","distance_ly":193.22058281782,"distance_method":"parallax","ra_deg":332.57924878694814,"dec_deg":19.616339,"epoch_ra_deg":332.900684,"epoch_dec_deg":19.748311,"epoch_moved_arcsec":3.528,"pm_ra_mas_yr":92.06,"pm_dec_mas_yr":-93.77,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pegasus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-210460","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":"22103+1937","age_years":2015939000,"companions":[{"measured":2015,"magnitude":null,"components":"AB","discoverer_code":"CHR 106","separation_arcsec":0.7,"position_angle_deg":166},{"measured":2014,"magnitude":17.71,"components":"AC","discoverer_code":"TOK 639","separation_arcsec":690.3,"position_angle_deg":267}],"mass_solar":1.656,"radius_solar":3.383,"spectral_type":"G1V","uncertainties":{"distance_ly":[3.8150409402055363,3.971886637868148],"metallicity_fe_h":[0.12,0.12]},"color_index_bv":0.688,"luminosity_solar":10.308607400626256,"metallicity_fe_h":-0.245,"radial_velocity_km_s":21.3,"spectral_type_source":"SIMBAD (2018A&A...612A..96F, quality C)","surface_gravity_log_g":3.571,"surface_temperature_k":5688,"metallicity_fe_h_source":"Median of 6 spectroscopic determinations in 11 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":92.06,"proper_motion_dec_mas_yr":-93.77,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":10.4314},"designations":[{"catalog":"Gliese","designation":"GJ 4261"},{"catalog":"HD","designation":"HD 210460"},{"catalog":"HIP","designation":"HIP 109439"},{"catalog":"HR","designation":"HR 8455"}],"updated_at":"2026-11-04T19:31:31.075Z","citation":{"plain":"SpaceCatalog. HD 210460 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-210460","bibtex":"@misc{spacecatalog_hd-210460,\n  author       = {{SpaceCatalog}},\n  title        = {{HD 210460}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-210460},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-210460","release":"DR1","doi":null},"references":[{"bibcode":"2018A&A...612A..96F","ads_url":"https://ui.adsabs.harvard.edu/abs/2018A%26A...612A..96F/abstract","quantity":"properties.spectral_type_source"}],"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."}