{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T00:14:22.289Z","years_from_j2000":26.682,"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-66242","name":"HD 66242","class":"f8_g0iv_yellow_white_subgiant","category":"star","object_type":"F8/G0IV yellow-white subgiant","mag":6.34,"mag_band":"V","abs_mag":1.04,"abs_mag_band":"V","distance_ly":374.4620941948594,"distance_method":"parallax","ra_deg":120.608205,"dec_deg":-6.337135,"epoch_ra_deg":120.937996,"epoch_dec_deg":-6.411771,"epoch_moved_arcsec":0.344,"pm_ra_mas_yr":6.27,"pm_dec_mas_yr":-11.25,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Monoceros","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-66242","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":835043300,"mass_solar":2.232,"radius_solar":5.631,"spectral_type":"F8/G0IV","uncertainties":{"metallicity_fe_h":[0.052,0.052]},"color_index_bv":0.615,"luminosity_solar":33.419504002611426,"metallicity_fe_h":-0.21,"radial_velocity_km_s":-17,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","surface_gravity_log_g":3.24,"surface_temperature_k":5826,"metallicity_fe_h_source":"Median of 3 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":6.27,"proper_motion_dec_mas_yr":-11.25,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":32.5059},"designations":[{"catalog":"HD","designation":"HD 66242"},{"catalog":"HIP","designation":"HIP 39326"},{"catalog":"HR","designation":"HR 3150"}],"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."}