{"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":"2026-09-04T01:19:52.238Z","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-107213","name":"9 Com","class":"f8va_yellow_white_main_sequence_star","category":"star","object_type":"F8Va yellow-white main-sequence star","mag":6.38,"mag_band":"V","abs_mag":2.699,"abs_mag_band":"V","distance_ly":177.6449849999569,"distance_method":"parallax","ra_deg":184.873095,"dec_deg":28.156916,"epoch_ra_deg":185.209679,"epoch_dec_deg":28.00686,"epoch_moved_arcsec":6.357,"pm_ra_mas_yr":-202.47,"pm_dec_mas_yr":-125.69,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Coma Berenices","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-107213","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"12195+2809","age_years":3068396600,"companions":[{"measured":2015,"magnitude":8.95,"components":null,"discoverer_code":"LEP  53","separation_arcsec":545.5,"position_angle_deg":224}],"mass_solar":1.386,"radius_solar":2.021,"spectral_type":"F8Va","uncertainties":{"metallicity_fe_h":[0.067,0.067]},"color_index_bv":0.523,"luminosity_solar":7.251034976171981,"metallicity_fe_h":0.21,"radial_velocity_km_s":-8,"spectral_type_source":"SIMBAD (1970ApJS...19..281B, quality C)","surface_gravity_log_g":4.001,"surface_temperature_k":6138,"metallicity_fe_h_source":"Median of 12 spectroscopic determinations in 20 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-202.47,"proper_motion_dec_mas_yr":-125.69,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":5.2114},"designations":[{"catalog":"Bayer/Flamsteed","designation":"9 Com"},{"catalog":"HD","designation":"HD 107213"},{"catalog":"HIP","designation":"HIP 60098"},{"catalog":"HR","designation":"HR 4688"}],"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."}