{ "family": "stars", "name": "Bright & Nearby Stars", "generatedAt": "2026-10-14", "count": 10, "objects": [ { "id": "star:sirius", "slug": "sirius", "canonicalName": "Sirius (Alpha Canis Majoris)", "aliases": [ "α Canis Majoris", "Sirius A & B", "HD 48915", "HIP 32349" ], "constellation": "Canis Major", "path": "/objects/stars/sirius/", "coordinates": { "raHours": 6.752478, "raSexagesimal": "06h 45m 08.92s", "decDegrees": -16.716111, "decSexagesimal": "-16° 42′ 58.0″", "epoch": "J2000.0", "sourceId": "src:hipparcos-new" }, "classification": { "primaryClass": "Spectroscopic & visual binary (A-type main-sequence + DA2 white dwarf)", "spectralType": "A0mA1 Va + DA2" }, "measurements": [ { "id": "star:sirius:vmag", "entityId": "star:sirius", "property": "apparent_magnitude_v", "label": "Apparent visual magnitude (Sirius A)", "value": -1.46, "unit": "mag", "uncertainty": { "kind": "symmetric", "plusMinus": 0.01 }, "method": "Johnson UBV photoelectric photometry", "epoch": "J2000.0", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:sirius:plx", "entityId": "star:sirius", "property": "parallax_mas", "label": "Trigonometric parallax", "value": 379.21, "unit": "mas", "uncertainty": { "kind": "symmetric", "plusMinus": 1.58 }, "method": "Hipparcos New Reduction astrometric solution", "epoch": "J2000.0", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:sirius:dist-ly", "entityId": "star:sirius", "property": "distance_ly", "label": "Distance in light-years", "value": 8.6, "unit": "ly", "uncertainty": { "kind": "symmetric", "plusMinus": 0.04 }, "method": "Derived from parallax 379.21 ± 1.58 mas (2.637 ± 0.011 pc)", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:sirius:mass", "entityId": "star:sirius", "property": "mass_solar", "label": "Primary mass (Sirius A)", 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}, { "id": "star:proxima-centauri:mass", "entityId": "star:proxima-centauri", "property": "mass_solar", "label": "Stellar mass", "value": 0.1221, "unit": "M☉", "uncertainty": { "kind": "symmetric", "plusMinus": 0.0022 }, "method": "VLTI interferometric radius + empirical M-dwarf mass-luminosity relation", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "high-confidence" }, { "id": "star:proxima-centauri:radius", "entityId": "star:proxima-centauri", "property": "radius_solar", "label": "Linear radius", "value": 0.1542, "unit": "R☉", "uncertainty": { "kind": "symmetric", "plusMinus": 0.0045 }, "method": "VLTI/PIONIER optical interferometry (angular diameter 1.030 ± 0.030 mas)", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" }, { "id": "star:proxima-centauri:teff", "entityId": "star:proxima-centauri", "property": "effective_temperature_k", "label": "Effective temperature", "value": 3042, "unit": "K", "uncertainty": { "kind": "symmetric", "plusMinus": 117 }, "method": "Bolometric flux + interferometric angular diameter", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "high-confidence" } ], "sources": [ "src:gaia-dr3", "src:nasa-exoplanet-archive", "src:simbad-cds" ] }, { "id": "star:vega", "slug": "vega", "canonicalName": "Vega (Alpha Lyrae)", "aliases": [ "α Lyrae", "HD 172167", "HIP 91262", "3 Lyrae" ], "constellation": "Lyra", "path": "/objects/stars/vega/", "coordinates": { "raHours": 18.615649, "raSexagesimal": "18h 36m 56.34s", "decDegrees": 38.783689, "decSexagesimal": "+38° 47′ 01.3″", "epoch": "J2000.0", "sourceId": "src:hipparcos-new" }, "classification": { "primaryClass": "Rapidly rotating A-type main-sequence star with debris disk", "spectralType": "A0 Va" }, "measurements": [ { "id": "star:vega:vmag", "entityId": "star:vega", "property": "apparent_magnitude_v", "label": "Apparent visual magnitude (V)", "value": 0.03, "unit": "mag", "uncertainty": { "kind": "symmetric", "plusMinus": 0.01 }, "method": "Johnson UBV standard star (historical 0.00 mag zero-point anchor)", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:vega:plx", "entityId": "star:vega", "property": "parallax_mas", "label": "Trigonometric parallax", "value": 130.23, "unit": "mas", "uncertainty": { "kind": "symmetric", "plusMinus": 0.36 }, "method": "Hipparcos New Reduction astrometric solution", "epoch": "J2000.0", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:vega:dist-ly", "entityId": "star:vega", "property": "distance_ly", "label": "Distance in light-years", "value": 25.04, "unit": "ly", "uncertainty": { "kind": "symmetric", "plusMinus": 0.07 }, "method": "Derived from parallax 130.23 ± 0.36 mas (7.679 ± 0.021 pc)", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:vega:mass", "entityId": "star:vega", "property": "mass_solar", "label": "Stellar mass", "value": 2.135, "unit": "M☉", "uncertainty": { "kind": "symmetric", "plusMinus": 0.074 }, "method": "CHARA optical interferometry + oblate rotating stellar evolution model", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "high-confidence" }, { "id": "star:vega:teff", "entityId": "star:vega", "property": "effective_temperature_k", "label": "Polar effective temperature", "value": 10060, "unit": "K", "uncertainty": { "kind": "range", "min": 7900, "max": 10060 }, "method": "CHARA interferometric gravity-darkening profile (poles ~10,060 K vs equator ~7,900 K)", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "high-confidence" } ], "sources": [ "src:hipparcos-new", "src:iau-star-names", "src:jwst-archive" ] }, { "id": "star:rigel", "slug": "rigel", "canonicalName": "Rigel (Beta Orionis)", "aliases": [ "β Orionis", "HD 34085", "HIP 24436", "19 Orionis" ], "constellation": "Orion", "path": "/objects/stars/rigel/", "coordinates": { "raHours": 5.242298, "raSexagesimal": "05h 14m 32.27s", "decDegrees": -8.201639, "decSexagesimal": "-08° 12′ 05.9″", "epoch": "J2000.0", "sourceId": "src:hipparcos-new" }, "classification": { "primaryClass": "Blue supergiant multiple star system (Alpha Cygni variable)", "spectralType": "B8 Ia" }, "measurements": [ { "id": "star:rigel:vmag", "entityId": "star:rigel", "property": "apparent_magnitude_v", "label": "Apparent visual magnitude (V)", "value": 0.13, "unit": "mag", "uncertainty": { "kind": "range", "min": 0.05, "max": 0.18 }, "method": "Photoelectric V-band photometry (Alpha Cygni micro-pulsations)", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:rigel:dist-pc", "entityId": "star:rigel", "property": "distance_pc", "label": "Heliocentric distance", "value": 264, "unit": "pc", "uncertainty": { "kind": "symmetric", "plusMinus": 24 }, "method": "Hipparcos New Reduction parallax (3.78 ± 0.34 mas)", "epoch": "J2000.0", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "high-confidence" }, { "id": "star:rigel:lum", "entityId": "star:rigel", "property": "luminosity_solar", "label": "Bolometric luminosity", "value": 120000, "unit": "L☉", "uncertainty": { "kind": "symmetric", "plusMinus": 25000 }, "method": "VLTI interferometric angular diameter (2.75 mas) + UV/optical spectrophotometry", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "model-dependent" }, { "id": "star:rigel:radius", "entityId": "star:rigel", "property": "radius_solar", "label": "Photospheric radius", "value": 78.9, "unit": "R☉", "uncertainty": { "kind": "symmetric", "plusMinus": 7.4 }, "method": "VLTI/AMBER limb-darkened angular diameter at 264 pc", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "high-confidence" }, { "id": "star:rigel:teff", "entityId": "star:rigel", "property": "effective_temperature_k", "label": "Effective temperature", "value": 12100, "unit": "K", "uncertainty": { "kind": "symmetric", "plusMinus": 150 }, "method": "Non-LTE B8 Ia quantitative spectroscopy", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" } ], "sources": [ "src:hipparcos-new", "src:iau-star-names", "src:simbad-cds" ] }, { "id": "star:arcturus", "slug": "arcturus", "canonicalName": "Arcturus (Alpha Bootis)", "aliases": [ "α Bootis", "HD 124897", "HIP 69673", "16 Bootis" ], "constellation": "Boötes", "path": "/objects/stars/arcturus/", "coordinates": { "raHours": 14.261022, "raSexagesimal": "14h 15m 39.67s", "decDegrees": 19.182409, "decSexagesimal": "+19° 10′ 56.7″", "epoch": "J2000.0", "sourceId": "src:hipparcos-new" }, "classification": { "primaryClass": "K-type red giant branch star (thick-disk / Arcturus stream)", "spectralType": "K1.5 III Fe-0.5" }, "measurements": [ { "id": "star:arcturus:vmag", "entityId": "star:arcturus", "property": "apparent_magnitude_v", "label": "Apparent visual magnitude (V)", "value": -0.05, "unit": "mag", "uncertainty": { "kind": "symmetric", "plusMinus": 0.01 }, "method": "Johnson UBV photoelectric photometry", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:arcturus:plx", "entityId": "star:arcturus", "property": "parallax_mas", "label": "Trigonometric parallax", "value": 88.83, "unit": "mas", "uncertainty": { "kind": "symmetric", "plusMinus": 0.54 }, "method": "Hipparcos New Reduction astrometric solution", "epoch": "J2000.0", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:arcturus:dist-ly", "entityId": "star:arcturus", "property": "distance_ly", "label": "Distance in light-years", "value": 36.72, "unit": "ly", "uncertainty": { "kind": "symmetric", "plusMinus": 0.22 }, "method": "Derived from parallax 88.83 ± 0.54 mas (11.26 ± 0.07 pc)", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:arcturus:radius", "entityId": "star:arcturus", "property": "radius_solar", "label": "Linear photospheric radius", "value": 25.4, "unit": "R☉", "uncertainty": { "kind": "symmetric", "plusMinus": 0.2 }, "method": "Interferometric angular diameter (21.06 ± 0.17 mas) at 11.26 pc", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" }, { "id": "star:arcturus:teff", "entityId": "star:arcturus", "property": "effective_temperature_k", "label": "Effective temperature", "value": 4286, "unit": "K", "uncertainty": { "kind": "symmetric", "plusMinus": 30 }, "method": "Bolometric flux + limb-darkened interferometric diameter", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" }, { "id": "star:arcturus:feh", "entityId": "star:arcturus", "property": "metallicity_fe_h", "label": "Metallicity [Fe/H]", "value": -0.52, "unit": "dex", "uncertainty": { "kind": "symmetric", "plusMinus": 0.04 }, "method": "High-resolution optical/NIR spectroscopy (Ramírez & Allende Prieto 2011)", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" } ], "sources": [ "src:hipparcos-new", "src:iau-star-names", "src:simbad-cds" ] }, { "id": "star:capella", "slug": "capella", "canonicalName": "Capella (Alpha Aurigae)", "aliases": [ "α Aurigae", "HD 34029", "HIP 24608", "13 Aurigae" ], "constellation": "Auriga", "path": "/objects/stars/capella/", "coordinates": { "raHours": 5.278155, "raSexagesimal": "05h 16m 41.36s", "decDegrees": 45.997991, "decSexagesimal": "+45° 59′ 52.8″", "epoch": "J2000.0", "sourceId": "src:hipparcos-new" }, "classification": { "primaryClass": "Spectroscopic & interferometric binary of two G-type giant stars 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"distance_ly", "label": "Distance in light-years", "value": 42.92, "unit": "ly", "uncertainty": { "kind": "symmetric", "plusMinus": 0.05 }, "method": "3D spectroscopic + interferometric orbital parallax (Torres et al. 2015: 13.159 ± 0.013 pc)", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" }, { "id": "star:capella:period", "entityId": "star:capella", "property": "orbital_period_days", "label": "Binary orbital period (Aa–Ab)", "value": 104.0213, "unit": "d", "uncertainty": { "kind": "symmetric", "plusMinus": 0.0002 }, "method": "Combined radial-velocity and optical interferometry", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" }, { "id": "star:capella:mass", "entityId": "star:capella", "property": "mass_solar", "label": "Primary giant mass (Capella Aa)", "value": 2.5687, "unit": "M☉", "uncertainty": { "kind": "symmetric", "plusMinus": 0.0074 }, "method": "3D dynamical orbit (Ab = 2.4828 ± 0.0067 M☉)", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" } ], "sources": [ "src:hipparcos-new", "src:iau-star-names", "src:simbad-cds" ] }, { "id": "star:altair", "slug": "altair", "canonicalName": "Altair (Alpha Aquilae)", "aliases": [ "α Aquilae", "HD 187642", "HIP 97649", "53 Aquilae" ], "constellation": "Aquila", "path": "/objects/stars/altair/", "coordinates": { "raHours": 19.846389, "raSexagesimal": "19h 50m 47.00s", "decDegrees": 8.868322, "decSexagesimal": "+08° 52′ 06.0″", "epoch": "J2000.0", "sourceId": "src:hipparcos-new" }, "classification": { "primaryClass": "Rapidly rotating A-type main-sequence star (Delta Scuti variable)", "spectralType": "A7 Vn" }, "measurements": [ { "id": "star:altair:vmag", "entityId": "star:altair", "property": "apparent_magnitude_v", "label": "Apparent visual magnitude (V)", "value": 0.76, "unit": "mag", "uncertainty": { "kind": "symmetric", "plusMinus": 0.01 }, "method": "Johnson UBV 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"label": "Stellar mass", "value": 1.86, "unit": "M☉", "uncertainty": { "kind": "symmetric", "plusMinus": 0.03 }, "method": "CHARA direct surface image + asteroseismology (Bouchaud et al. 2020)", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "high-confidence" }, { "id": "star:altair:teff", "entityId": "star:altair", "property": "effective_temperature_k", "label": "Effective temperature (polar to equatorial)", "value": 7550, "unit": "K", "uncertainty": { "kind": "range", "min": 6860, "max": 8450 }, "method": "CHARA/MIRC direct interferometric surface imaging", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" } ], "sources": [ "src:hipparcos-new", "src:iau-star-names", "src:simbad-cds" ] }, { "id": "star:aldebaran", "slug": "aldebaran", "canonicalName": "Aldebaran (Alpha Tauri)", "aliases": [ "α Tauri", "HD 29139", "HIP 21421", "87 Tauri" ], "constellation": "Taurus", "path": "/objects/stars/aldebaran/", "coordinates": { "raHours": 4.598677, "raSexagesimal": "04h 35m 55.24s", "decDegrees": 16.509302, "decSexagesimal": "+16° 30′ 33.5″", "epoch": "J2000.0", "sourceId": "src:hipparcos-new" }, "classification": { "primaryClass": "Evolved K-type red giant branch star", "spectralType": "K5+ III" }, "measurements": [ { "id": "star:aldebaran:vmag", "entityId": "star:aldebaran", "property": "apparent_magnitude_v", "label": "Apparent visual magnitude (V)", "value": 0.86, "unit": "mag", "uncertainty": { "kind": "range", "min": 0.75, "max": 0.95 }, "method": "Johnson UBV photometry (slow irregular LB micro-variability)", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:aldebaran:plx", "entityId": "star:aldebaran", "property": "parallax_mas", "label": "Trigonometric parallax", "value": 48.94, "unit": "mas", "uncertainty": { "kind": "symmetric", "plusMinus": 0.77 }, "method": "Hipparcos New Reduction astrometric solution", "epoch": "J2000.0", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:aldebaran:dist-ly", "entityId": "star:aldebaran", "property": "distance_ly", "label": "Distance in light-years", "value": 66.64, "unit": "ly", "uncertainty": { "kind": "symmetric", "plusMinus": 1.05 }, "method": "Derived from parallax 48.94 ± 0.77 mas (20.43 ± 0.32 pc)", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:aldebaran:radius", "entityId": "star:aldebaran", "property": "radius_solar", "label": "Photospheric radius", "value": 45.1, "unit": "R☉", "uncertainty": { "kind": "symmetric", "plusMinus": 0.1 }, "method": "Lunar occultation & VLTI interferometric diameter (20.58 ± 0.03 mas)", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" }, { "id": "star:aldebaran:teff", "entityId": "star:aldebaran", "property": "effective_temperature_k", "label": "Effective temperature", "value": 3910, "unit": "K", "uncertainty": { "kind": "symmetric", "plusMinus": 50 }, "method": "High-resolution spectroscopy & bolometric flux", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" } ], "sources": [ "src:hipparcos-new", "src:iau-star-names", "src:simbad-cds" ] }, { "id": "star:spica", "slug": "spica", "canonicalName": "Spica (Alpha Virginis)", "aliases": [ "α Virginis", "HD 116658", "HIP 65474", "67 Virginis" ], "constellation": "Virgo", "path": "/objects/stars/spica/", "coordinates": { "raHours": 13.419883, "raSexagesimal": "13h 25m 11.58s", "decDegrees": -11.161322, "decSexagesimal": "-11° 09′ 40.8″", "epoch": "J2000.0", "sourceId": "src:hipparcos-new" }, "classification": { "primaryClass": "Double-lined spectroscopic & rotating ellipsoidal B-type binary (Beta Cephei variable)", "spectralType": "B1 III-IV + B2 V" }, "measurements": [ { "id": "star:spica:vmag", "entityId": "star:spica", "property": "apparent_magnitude_v", "label": "Combined apparent visual magnitude (V)", "value": 0.97, "unit": "mag", "uncertainty": { "kind": "range", "min": 0.95, "max": 1.05 }, "method": "Photoelectric V-band photometry (ellipsoidal + Beta Cephei modulation)", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:spica:dist-pc", "entityId": "star:spica", "property": "distance_pc", "label": "Heliocentric distance", "value": 76.6, "unit": "pc", "uncertainty": { "kind": "symmetric", "plusMinus": 3.9 }, "method": "Hipparcos New Reduction + Narrabri/NPOI interferometric orbital parallax", "epoch": "J2000.0", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "high-confidence" }, { "id": "star:spica:period", "entityId": "star:spica", "property": "orbital_period_days", "label": "Binary orbital period", "value": 4.0145898, "unit": "d", "uncertainty": { "kind": "symmetric", "plusMinus": 0.000001 }, "method": "Spectroscopic radial velocity & apsidal motion tracking", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" }, { "id": "star:spica:mass", "entityId": "star:spica", "property": "mass_solar", "label": "Primary component mass (Spica A)", "value": 11.43, "unit": "M☉", "uncertainty": { "kind": "symmetric", "plusMinus": 1.15 }, "method": "Double-lined spectroscopic + interferometric orbit (Spica B = 7.21 ± 0.75 M☉)", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "high-confidence" }, { "id": "star:spica:teff", "entityId": "star:spica", "property": "effective_temperature_k", "label": "Primary effective temperature", "value": 25300, "unit": "K", "uncertainty": { "kind": "symmetric", "plusMinus": 500 }, "method": "UV & optical non-LTE B-star spectroscopy", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" } ], "sources": [ "src:hipparcos-new", "src:iau-star-names", "src:simbad-cds" ] }, { "id": "star:tau-ceti", "slug": "tau-ceti", "canonicalName": "Tau Ceti (HD 10700 / 52 Ceti)", "aliases": [ "τ Ceti", "HD 10700", "HIP 8102", "52 Ceti" ], "constellation": "Cetus", "path": "/objects/stars/tau-ceti/", "coordinates": { "raHours": 1.734525, "raSexagesimal": "01h 44m 04.08s", "decDegrees": -15.93748, "decSexagesimal": "-15° 56′ 14.9″", "epoch": "J2000.0", "sourceId": "src:gaia-dr3" }, "classification": { "primaryClass": "Nearest single G-type main-sequence star to the Sun", "spectralType": "G8 V" }, "measurements": [ { "id": "star:tau-ceti:plx", "entityId": "star:tau-ceti", "property": "parallax_mas", "label": "Trigonometric parallax (Gaia DR3)", "value": 273.8097, "unit": "mas", "uncertainty": { "kind": "symmetric", "plusMinus": 0.1701 }, "method": "Gaia DR3 five-parameter astrometric solution", "epoch": "J2016.0", "sourceId": "src:gaia-dr3", "datasetVersion": "DR3 (2022-06-13)", "qualityStatus": "definitive" }, { "id": "star:tau-ceti:dist-ly", "entityId": "star:tau-ceti", "property": "distance_ly", "label": "Distance in light-years", "value": 11.912, "unit": "ly", "uncertainty": { "kind": "symmetric", "plusMinus": 0.007 }, "method": "Derived from Gaia DR3 parallax (3.6522 ± 0.0023 pc)", "epoch": "J2016.0", "sourceId": "src:gaia-dr3", "datasetVersion": "DR3 (2022-06-13)", "qualityStatus": "definitive" }, { "id": "star:tau-ceti:vmag", "entityId": "star:tau-ceti", "property": "apparent_magnitude_v", "label": "Apparent visual magnitude (V)", "value": 3.5, "unit": "mag", "uncertainty": { "kind": "symmetric", "plusMinus": 0.01 }, "method": "Johnson UBV photoelectric photometry", "sourceId": "src:hipparcos-new", "datasetVersion": "2007 New Reduction", "qualityStatus": "definitive" }, { "id": "star:tau-ceti:mass", "entityId": "star:tau-ceti", "property": "mass_solar", "label": "Stellar mass", "value": 0.783, "unit": "M☉", "uncertainty": { "kind": "symmetric", "plusMinus": 0.012 }, "method": "CHARA interferometric radius (0.793 ± 0.004 R☉) + asteroseismology", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" }, { "id": "star:tau-ceti:feh", "entityId": "star:tau-ceti", "property": "metallicity_fe_h", "label": "Metallicity [Fe/H]", "value": -0.52, "unit": "dex", "uncertainty": { "kind": "symmetric", "plusMinus": 0.03 }, "method": "High-resolution optical spectroscopy", "sourceId": "src:simbad-cds", "datasetVersion": "2026-10 release", "qualityStatus": "definitive" } ], "sources": [ "src:gaia-dr3", "src:hipparcos-new", "src:nasa-exoplanet-archive" ] } ] }