{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T09:40:52.018Z","years_from_j2000":26.669,"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-148786","name":"8 φ Oph","class":"g8_iiia_yellow_star","category":"star","object_type":"G8+IIIa yellow star","mag":4.29,"mag_band":"V","abs_mag":-0.076,"abs_mag_band":"V","distance_ly":243.5820629446846,"distance_method":"parallax","ra_deg":247.784865,"dec_deg":-16.612733,"epoch_ra_deg":248.169689,"epoch_dec_deg":-16.671202,"epoch_moved_arcsec":1.563,"pm_ra_mas_yr":-44.57,"pm_dec_mas_yr":-38.04,"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-148786","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16311-1637","companions":[{"measured":2016,"magnitude":12.9,"components":"AB","discoverer_code":"BU  626","separation_arcsec":39.2,"position_angle_deg":37},{"measured":2015,"magnitude":10.78,"components":"AC","discoverer_code":"BU  626","separation_arcsec":119.4,"position_angle_deg":320}],"spectral_type":"G8+IIIa","uncertainties":{"metallicity_fe_h":[0.046,0.046]},"color_index_bv":0.924,"luminosity_solar":93.41142557364785,"metallicity_fe_h":0.165,"radial_velocity_km_s":-34,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","surface_gravity_log_g":2.75,"surface_temperature_k":5108,"metallicity_fe_h_source":"Median of 4 spectroscopic determinations in 6 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-44.57,"proper_motion_dec_mas_yr":-38.04,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"8 Phi Oph"},{"catalog":"HD","designation":"HD 148786"},{"catalog":"HIP","designation":"HIP 80894"},{"catalog":"HR","designation":"HR 6147"}],"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."}