{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T18:44:05.475Z","years_from_j2000":26.678,"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-141680","name":"34 ω Ser","class":"k0iv_orange_subgiant","category":"star","object_type":"K0IV orange subgiant","mag":5.21,"mag_band":"V","abs_mag":0.593,"abs_mag_band":"V","distance_ly":273.3917773988618,"distance_method":"parallax","ra_deg":237.573105,"dec_deg":2.196509,"epoch_ra_deg":237.912783,"epoch_dec_deg":2.114408,"epoch_moved_arcsec":1.504,"pm_ra_mas_yr":30.15,"pm_dec_mas_yr":-47.62,"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/hd-141680","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"15503+0212","age_years":376856030,"companions":[{"measured":2016,"magnitude":10.34,"components":null,"discoverer_code":"SKF1311","separation_arcsec":74.8,"position_angle_deg":300}],"mass_solar":3.002,"radius_solar":11.075,"spectral_type":"K0IV","color_index_bv":1.019,"luminosity_solar":50.4428945952414,"radial_velocity_km_s":-4,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":2.278,"surface_temperature_k":4682,"proper_motion_ra_mas_yr":30.15,"proper_motion_dec_mas_yr":-47.62,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":54.567},"designations":[{"catalog":"Bayer/Flamsteed","designation":"34 Omega Ser"},{"catalog":"HD","designation":"HD 141680"},{"catalog":"HIP","designation":"HIP 77578"},{"catalog":"HR","designation":"HR 5888"}],"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."}