{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T08:34:24.568Z","years_from_j2000":26.674,"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-177389","name":"HD 177389","class":"k0iv_orange_subgiant","category":"star","object_type":"K0IV orange subgiant","mag":5.31,"mag_band":"V","abs_mag":2.447,"abs_mag_band":"V","distance_ly":121.92769099460563,"distance_method":"parallax","ra_deg":287.46963,"dec_deg":-68.424448,"epoch_ra_deg":288.178155,"epoch_dec_deg":-68.381177,"epoch_moved_arcsec":4.286,"pm_ra_mas_yr":154.94,"pm_dec_mas_yr":-42.59,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pavo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-177389","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19099-6825","age_years":2708129200,"companions":[{"measured":2016,"magnitude":7.59,"components":null,"discoverer_code":"SHY 314","separation_arcsec":449.2,"position_angle_deg":1}],"mass_solar":1.51,"radius_solar":4.405,"spectral_type":"K0IV","uncertainties":{"metallicity_fe_h":[0.103,0.103]},"color_index_bv":0.901,"luminosity_solar":9.145343031204598,"metallicity_fe_h":-0.05,"radial_velocity_km_s":-10,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":3.082,"surface_temperature_k":4946,"metallicity_fe_h_source":"Median of 3 spectroscopic determinations in 3 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":154.94,"proper_motion_dec_mas_yr":-42.59,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":10.4708},"designations":[{"catalog":"HD","designation":"HD 177389"},{"catalog":"HIP","designation":"HIP 94150"},{"catalog":"HR","designation":"HR 7221"}],"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."}