{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T13:20:30.867Z","years_from_j2000":26.67,"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":"hd-30649","name":"HD 30649","class":"f9vgg1mf7_yellow_white_main_sequence_star","category":"star","object_type":"F9VgG1mF7 yellow-white main-sequence star","mag":6.94,"mag_band":"V","abs_mag":4.541,"abs_mag_band":"V","distance_ly":98.44736720639955,"distance_method":"parallax","ra_deg":72.931095,"dec_deg":45.834157,"epoch_ra_deg":73.425823,"epoch_dec_deg":45.87543,"epoch_moved_arcsec":18.099,"pm_ra_mas_yr":376.09,"pm_dec_mas_yr":-564.9,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Auriga","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-30649","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"04517+4550","age_years":10502392000,"companions":[{"measured":2016,"magnitude":14.8,"components":"AD","discoverer_code":"LLO   6","separation_arcsec":5.8,"position_angle_deg":153},{"measured":2016,"magnitude":12,"components":"AB","discoverer_code":"BUP  71","separation_arcsec":88.1,"position_angle_deg":44}],"mass_solar":0.965,"radius_solar":1.203,"spectral_type":"F9VgG1mF7","uncertainties":{"metallicity_fe_h":[0.103,0.103]},"color_index_bv":0.586,"luminosity_solar":1.3292295883156824,"metallicity_fe_h":-0.46,"radial_velocity_km_s":25.9,"spectral_type_source":"SIMBAD (1986ApJ...309..260A, quality C)","surface_gravity_log_g":4.279,"surface_temperature_k":5729,"metallicity_fe_h_source":"Median of 13 spectroscopic determinations in 14 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":376.09,"proper_motion_dec_mas_yr":-564.9,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":1.3976},"designations":[{"catalog":"Gliese","designation":"GJ 9168"},{"catalog":"HD","designation":"HD 30649"},{"catalog":"HIP","designation":"HIP 22596"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}