{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T16:50:00.427Z","years_from_j2000":26.681,"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-184960","name":"HD 184960","class":"f7v_yellow_white_main_sequence_star","category":"star","object_type":"F7V yellow-white main-sequence star","mag":5.71,"mag_band":"V","abs_mag":3.711,"abs_mag_band":"V","distance_ly":81.90765113600577,"distance_method":"parallax","ra_deg":293.582415,"dec_deg":51.23662,"epoch_ra_deg":293.755097,"epoch_dec_deg":51.293167,"epoch_moved_arcsec":5.091,"pm_ra_mas_yr":31.72,"pm_dec_mas_yr":-188.14,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-184960","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":3598967300,"mass_solar":1.206,"radius_solar":1.426,"spectral_type":"F7V","uncertainties":{"metallicity_fe_h":[0.064,0.064]},"color_index_bv":0.475,"luminosity_solar":2.8549598169004082,"metallicity_fe_h":-0.12,"radial_velocity_km_s":0.4,"spectral_type_source":"SIMBAD (quality E)","surface_gravity_log_g":4.193,"surface_temperature_k":6233,"metallicity_fe_h_source":"Median of 7 spectroscopic determinations in 11 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":31.72,"proper_motion_dec_mas_yr":-188.14,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":2.758},"designations":[{"catalog":"Exoplanet host","designation":"DMPP-4"},{"catalog":"Gliese","designation":"GJ 4116"},{"catalog":"HD","designation":"HD 184960"},{"catalog":"HIP","designation":"HIP 96258"},{"catalog":"HR","designation":"HR 7451"}],"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."}