{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T10:05:26.827Z","years_from_j2000":26.666,"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-5722","name":"23 φ⁴ Cet","class":"g8iii_yellow_giant","category":"star","object_type":"G8III yellow giant","mag":5.62,"mag_band":"V","abs_mag":0.663,"abs_mag_band":"V","distance_ly":319.7611034624735,"distance_method":"parallax","ra_deg":14.682780000000001,"dec_deg":-11.379975,"epoch_ra_deg":15.019299,"epoch_dec_deg":-11.235024,"epoch_moved_arcsec":0.971,"pm_ra_mas_yr":-33.16,"pm_dec_mas_yr":-15.02,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cetus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-5722","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":413544680,"mass_solar":2.901,"radius_solar":10.307,"spectral_type":"G8III","uncertainties":{"metallicity_fe_h":[0.066,0.066]},"color_index_bv":0.949,"luminosity_solar":47.293341491865164,"metallicity_fe_h":-0.205,"radial_velocity_km_s":-19,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":2.692,"surface_temperature_k":5070,"metallicity_fe_h_source":"Median of 8 spectroscopic determinations in 8 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-33.16,"proper_motion_dec_mas_yr":-15.02,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":69.7997},"designations":[{"catalog":"Bayer/Flamsteed","designation":"23 Phi4 Cet"},{"catalog":"HD","designation":"HD 5722"},{"catalog":"HIP","designation":"HIP 4587"},{"catalog":"HR","designation":"HR 279"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}