{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.820","julian_year":2026.82,"time":"2026-10-27T12:26:36.641Z","years_from_j2000":26.82,"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-114642","name":"53 Vir","class":"f5_5v_yellow_white_main_sequence_star","category":"star","object_type":"F5.5V yellow-white main-sequence star","mag":5.04,"mag_band":"V","abs_mag":2.388,"abs_mag_band":"V","distance_ly":110.59897537099225,"distance_method":"parallax","ra_deg":198.01476,"dec_deg":-16.198601,"epoch_ra_deg":198.374203,"epoch_dec_deg":-16.344073,"epoch_moved_arcsec":8.124,"pm_ra_mas_yr":96.17,"pm_dec_mas_yr":-287.23,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Virgo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-114642","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":"13121-1612","age_years":2119747900,"companions":[{"measured":2015,"magnitude":12.5,"components":"AB","discoverer_code":"HJ 2645","separation_arcsec":108.4,"position_angle_deg":1},{"measured":2015,"magnitude":12.83,"components":"AC","discoverer_code":"HJ 2645","separation_arcsec":152.6,"position_angle_deg":177},{"measured":2015,"magnitude":11.07,"components":"AD","discoverer_code":"HJ 2645","separation_arcsec":265.6,"position_angle_deg":328}],"mass_solar":1.586,"radius_solar":2.53,"spectral_type":"F5.5V","uncertainties":{"metallicity_fe_h":[0.07,0.07]},"color_index_bv":0.46,"luminosity_solar":9.656060985415495,"metallicity_fe_h":-0.17,"radial_velocity_km_s":-14,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":3.689,"surface_temperature_k":6250,"metallicity_fe_h_source":"Median of 7 spectroscopic determinations in 12 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":96.17,"proper_motion_dec_mas_yr":-287.23,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":9.2923},"designations":[{"catalog":"Bayer/Flamsteed","designation":"53 Vir"},{"catalog":"HD","designation":"HD 114642"},{"catalog":"HIP","designation":"HIP 64407"},{"catalog":"HR","designation":"HR 4981"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. 53 Vir [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-114642","bibtex":"@misc{spacecatalog_hd-114642,\n  author       = {{SpaceCatalog}},\n  title        = {{53 Vir}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/hd-114642},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/hd-114642","release":"DR1","doi":null},"references":[{"bibcode":"2006AJ....132..161G","ads_url":"https://ui.adsabs.harvard.edu/abs/2006AJ....132..161G/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."}