{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-02T23:26:30.564Z","years_from_j2000":26.671,"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":"hip-55852","name":"HIP 55852","class":"kiivw_orange_bright_giant","category":"star","object_type":"KIIvw orange bright giant","mag":10.53,"mag_band":"V","abs_mag":2.32,"abs_mag_band":"V","distance_ly":1430.5104571924164,"distance_method":"parallax","ra_deg":171.70495499999998,"dec_deg":3.864339,"epoch_ra_deg":172.050374,"epoch_dec_deg":3.716219,"epoch_moved_arcsec":1.764,"pm_ra_mas_yr":-21.38,"pm_dec_mas_yr":-62.58,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Leo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-55852","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":345513550,"mass_solar":3.101,"radius_solar":11.838,"spectral_type":"KIIvw","uncertainties":{"metallicity_fe_h":[0.193,0.193]},"color_index_bv":0.82,"luminosity_solar":10.280162981264736,"metallicity_fe_h":-1.95,"variable_mag_max":10.442,"variable_mag_min":10.602,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2000ApJ...544..302B, quality C)","surface_gravity_log_g":2.731,"surface_temperature_k":5657,"metallicity_fe_h_source":"Median of 5 spectroscopic determinations in 9 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-21.38,"proper_motion_dec_mas_yr":-62.58,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":88.0224},"designations":[{"catalog":"HIP","designation":"HIP 55852"}],"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."}