{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.819","julian_year":2026.819,"time":"2026-10-26T23:42:05.897Z","years_from_j2000":26.819,"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-11257","name":"HD 11257","class":"f0vs_yellow_white_main_sequence_star","category":"star","object_type":"F0Vs yellow-white main-sequence star","mag":5.92,"mag_band":"V","abs_mag":2.803,"abs_mag_band":"V","distance_ly":137.04047291248867,"distance_method":"parallax","ra_deg":27.716549999999998,"dec_deg":11.043378,"epoch_ra_deg":28.07503,"epoch_dec_deg":11.176894,"epoch_moved_arcsec":2.004,"pm_ra_mas_yr":-69.33,"pm_dec_mas_yr":-27.84,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aries","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-11257","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":"01509+1103","age_years":1302682500,"companions":[{"measured":1976,"magnitude":6.7,"components":"Aa,Ab","discoverer_code":"OCC 435","separation_arcsec":0.1,"position_angle_deg":-1},{"measured":1980,"magnitude":20.29,"components":"AB","discoverer_code":"TOK 229","separation_arcsec":178,"position_angle_deg":1}],"mass_solar":1.483,"radius_solar":1.648,"spectral_type":"F0Vs","uncertainties":{"metallicity_fe_h":[0.03,0.03]},"color_index_bv":0.302,"luminosity_solar":6.588704043340734,"metallicity_fe_h":-0.29,"radial_velocity_km_s":11,"spectral_type_source":"SIMBAD (1978PASP...90..429L, quality C)","surface_gravity_log_g":4.096,"surface_temperature_k":7017,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 4 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-69.33,"proper_motion_dec_mas_yr":-27.84,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":5.9765},"designations":[{"catalog":"HD","designation":"HD 11257"},{"catalog":"HIP","designation":"HIP 8588"},{"catalog":"HR","designation":"HR 534"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. HD 11257 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-11257","bibtex":"@misc{spacecatalog_hd-11257,\n  author       = {{SpaceCatalog}},\n  title        = {{HD 11257}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-11257},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-11257","release":"DR1","doi":null},"references":[{"bibcode":"1978PASP...90..429L","ads_url":"https://ui.adsabs.harvard.edu/abs/1978PASP...90..429L/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."}