{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.811","julian_year":2026.811,"time":"2026-10-24T06:03:31.470Z","years_from_j2000":26.811,"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":"mouhoun","name":"Mouhoun","class":"k0iii_orange_giant","category":"star","object_type":"K0III orange giant","mag":7.91,"mag_band":"V","abs_mag":2.549,"abs_mag_band":"V","distance_ly":385.07261347474054,"distance_method":"parallax","ra_deg":72.57442499999999,"dec_deg":-24.368839,"epoch_ra_deg":72.855541,"epoch_dec_deg":-24.322254,"epoch_moved_arcsec":0.701,"pm_ra_mas_yr":18.86,"pm_dec_mas_yr":-18.12,"position_epoch_jyear":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Eridanus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/mouhoun","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":{"age_years":2026371200,"mass_solar":1.66,"wikidata_id":"Q4039915","radius_solar":4.747,"spectral_type":"K0III","uncertainties":{"metallicity_fe_h":[0.049,0.049]},"color_index_bv":0.961,"luminosity_solar":8.325302067492423,"metallicity_fe_h":-0.125,"wikipedia_article":"HD 30856","radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":3.196,"surface_temperature_k":5014,"metallicity_fe_h_source":"Median of 6 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":18.86,"proper_motion_dec_mas_yr":-18.12,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":13.2653},"designations":[{"catalog":"Common name","designation":"Mouhoun"},{"catalog":"HD","designation":"HD 30856"},{"catalog":"HIP","designation":"HIP 22491"}],"updated_at":"2026-10-01T09:42:28.932Z","citation":{"plain":"SpaceCatalog. Mouhoun [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/mouhoun","bibtex":"@misc{spacecatalog_mouhoun,\n  author       = {{SpaceCatalog}},\n  title        = {{Mouhoun}},\n  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},\n  year         = {2026},\n  url          = {https://spacecatalog.org/object/mouhoun},\n  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}\n}","url":"https://spacecatalog.org/object/mouhoun","release":"DR1","doi":null},"references":[{"bibcode":"1988MSS...C04....0H","ads_url":"https://ui.adsabs.harvard.edu/abs/1988MSS...C04....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."}