{"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":"2026-09-02T06:42:21.779Z","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-6811","name":"42 φ And","class":"b5iiie_blue_white_giant","category":"star","object_type":"B5IIIe blue-white giant","mag":4.26,"mag_band":"V","abs_mag":-2.45,"abs_mag_band":"V","distance_ly":716.8271392586141,"distance_method":"parallax","ra_deg":17.37552,"dec_deg":47.241792,"epoch_ra_deg":17.766102,"epoch_dec_deg":47.384889,"epoch_moved_arcsec":0.362,"pm_ra_mas_yr":3.81,"pm_dec_mas_yr":-13.02,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Andromeda","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-6811","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"01095+4715","companions":[{"measured":2024,"magnitude":5.61,"components":"AB","discoverer_code":"STT 515","separation_arcsec":0.5,"position_angle_deg":112},{"measured":2021,"magnitude":null,"components":"AC","discoverer_code":"SBK   1","separation_arcsec":9.8,"position_angle_deg":224},{"measured":2021,"magnitude":null,"components":"AD","discoverer_code":"SBK   1","separation_arcsec":27.7,"position_angle_deg":63}],"spectral_type":"B5IIIe","color_index_bv":0.012,"luminosity_solar":831.7637711026708,"radial_velocity_km_s":-2.2,"spectral_type_source":"SIMBAD (1999A&AS..137..147S, quality C)","surface_gravity_log_g":3.15,"surface_temperature_k":13119,"proper_motion_ra_mas_yr":3.81,"proper_motion_dec_mas_yr":-13.02,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"42 Phi And"},{"catalog":"HD","designation":"HD 6811"},{"catalog":"HIP","designation":"HIP 5434"},{"catalog":"HR","designation":"HR 335"}],"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."}