{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T08:50:45.247Z","years_from_j2000":26.672,"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-152601","name":"23 Oph","class":"k1iicniii_orange_bright_giant","category":"star","object_type":"K1IICNIII orange bright giant","mag":5.23,"mag_band":"V","abs_mag":0.89,"abs_mag_band":"V","distance_ly":240.70568984960067,"distance_method":"parallax","ra_deg":253.648725,"dec_deg":-6.153982,"epoch_ra_deg":254.008011,"epoch_dec_deg":-6.197985,"epoch_moved_arcsec":0.995,"pm_ra_mas_yr":-30.23,"pm_dec_mas_yr":-21.86,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ophiuchus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-152601","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16546-0609","companions":[{"measured":2021,"magnitude":9.9,"components":"AB","discoverer_code":"DSG   1","separation_arcsec":0.5,"position_angle_deg":264},{"measured":2012,"magnitude":11.6,"components":"AC","discoverer_code":"DSG   1","separation_arcsec":0.7,"position_angle_deg":87}],"spectral_type":"K1IICNIII","uncertainties":{"metallicity_fe_h":[0.065,0.065]},"color_index_bv":1.1,"luminosity_solar":38.370724549227866,"metallicity_fe_h":0.065,"radial_velocity_km_s":-17,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":2.57,"surface_temperature_k":4660,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 2 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-30.23,"proper_motion_dec_mas_yr":-21.86,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"23 Oph"},{"catalog":"HD","designation":"HD 152601"},{"catalog":"HIP","designation":"HIP 82730"},{"catalog":"HR","designation":"HR 6280"}],"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."}