{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T10:25:29.151Z","years_from_j2000":26.68,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, 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. 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":"alasia","name":"Alasia","class":"g5v_yellow_main_sequence_star","category":"star","object_type":"G5V yellow main-sequence star","mag":7.95,"mag_band":"V","abs_mag":4.796,"abs_mag_band":"V","distance_ly":139.3829280172503,"distance_method":"parallax","ra_deg":275.457435,"dec_deg":-11.922683,"epoch_ra_deg":275.832928,"epoch_dec_deg":-11.910765,"epoch_moved_arcsec":1.939,"pm_ra_mas_yr":-22.13,"pm_dec_mas_yr":-69.23,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Serpens","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/alasia","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"18218-1155","companions":[{"measured":2005,"magnitude":null,"components":"AB","discoverer_code":"EGN  22","separation_arcsec":3.3,"position_angle_deg":141},{"measured":2005,"magnitude":null,"components":"AC","discoverer_code":"EGN  22","separation_arcsec":3.7,"position_angle_deg":47},{"measured":2005,"magnitude":null,"components":"AD","discoverer_code":"EGN  22","separation_arcsec":5.6,"position_angle_deg":243},{"measured":2005,"magnitude":null,"components":"AE","discoverer_code":"EGN  22","separation_arcsec":5.9,"position_angle_deg":354},{"measured":2005,"magnitude":null,"components":"AF","discoverer_code":"EGN  22","separation_arcsec":7.3,"position_angle_deg":106},{"measured":2005,"magnitude":null,"components":"AG","discoverer_code":"EGN  22","separation_arcsec":8.5,"position_angle_deg":290},{"measured":2005,"magnitude":null,"components":"AH","discoverer_code":"EGN  22","separation_arcsec":8.8,"position_angle_deg":218},{"measured":2005,"magnitude":null,"components":"AI","discoverer_code":"EGN  22","separation_arcsec":8.9,"position_angle_deg":132},{"measured":2005,"magnitude":null,"components":"AJ","discoverer_code":"EGN  22","separation_arcsec":10.4,"position_angle_deg":294},{"measured":2005,"magnitude":null,"components":"AK","discoverer_code":"EGN  22","separation_arcsec":10.6,"position_angle_deg":337},{"measured":2005,"magnitude":null,"components":"AL","discoverer_code":"EGN  22","separation_arcsec":12.2,"position_angle_deg":310},{"measured":2005,"magnitude":null,"components":"AM","discoverer_code":"EGN  22","separation_arcsec":12.8,"position_angle_deg":9},{"measured":2005,"magnitude":null,"components":"AN","discoverer_code":"EGN  22","separation_arcsec":12.9,"position_angle_deg":334},{"measured":2014,"magnitude":null,"components":"AO","discoverer_code":"EGN  22","separation_arcsec":14.2,"position_angle_deg":339},{"measured":2015,"magnitude":null,"components":"AP","discoverer_code":"EGN  22","separation_arcsec":19.6,"position_angle_deg":294},{"measured":2005,"magnitude":null,"components":"AQ","discoverer_code":"EGN  22","separation_arcsec":23.5,"position_angle_deg":309},{"measured":2015,"magnitude":null,"components":"AR","discoverer_code":"EGN  22","separation_arcsec":26.2,"position_angle_deg":313}],"mass_solar":0.892,"wikidata_id":"Q1563195","radius_solar":1.069,"spectral_type":"G5V","uncertainties":{"metallicity_fe_h":[0.04,0.04]},"color_index_bv":0.713,"luminosity_solar":1.0509934271862162,"metallicity_fe_h":-0.08,"wikipedia_article":"HD 168746","radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":4.327,"surface_temperature_k":5553,"metallicity_fe_h_source":"Median of 19 spectroscopic determinations in 20 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-22.13,"proper_motion_dec_mas_yr":-69.23,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.9851},"designations":[{"catalog":"Common name","designation":"Alasia"},{"catalog":"HD","designation":"HD 168746"},{"catalog":"HIP","designation":"HIP 90004"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}