{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.832","julian_year":2026.832,"time":"2026-10-31T17:33:11.212Z","years_from_j2000":26.832,"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-13789","name":"HD 13789","class":"k3_4v_orange_dwarf","category":"star","object_type":"K3/4V orange dwarf","mag":8.55,"mag_band":"V","abs_mag":6.768,"abs_mag_band":"V","distance_ly":74.09261816953489,"distance_method":"parallax","ra_deg":33.556545,"dec_deg":-3.635204,"epoch_ra_deg":33.897206,"epoch_dec_deg":-3.51067,"epoch_moved_arcsec":5.85,"pm_ra_mas_yr":-12.05,"pm_dec_mas_yr":-217.7,"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-13789","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":"02142-0338","age_years":10323949000,"companions":[{"measured":2017,"magnitude":13.1,"components":null,"discoverer_code":"RAO 684","separation_arcsec":2.8,"position_angle_deg":211}],"mass_solar":0.75,"radius_solar":0.781,"spectral_type":"K3/4V","uncertainties":{"metallicity_fe_h":[0.087,0.087]},"color_index_bv":1.055,"luminosity_solar":0.17092280052343314,"metallicity_fe_h":0.03,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","surface_gravity_log_g":4.542,"surface_temperature_k":4583,"metallicity_fe_h_source":"Median of 6 spectroscopic determinations in 6 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-12.05,"proper_motion_dec_mas_yr":-217.7,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.2433},"designations":[{"catalog":"HD","designation":"HD 13789"},{"catalog":"HIP","designation":"HIP 10416"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. HD 13789 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-13789","bibtex":"@misc{spacecatalog_hd-13789,\n  author       = {{SpaceCatalog}},\n  title        = {{HD 13789}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-13789},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-13789","release":"DR1","doi":null},"references":[{"bibcode":"1999MSS...C05....0H","ads_url":"https://ui.adsabs.harvard.edu/abs/1999MSS...C05....0H/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."}