{"case":{"id":"OS-0010","title":"The young star nobody classified","hook":"Listed as a 'suspected variable' for decades. Gaia, ZTF and NEOWISE agree: a young star in Perseus whose own disk keeps blotting it out.","status":"interpreted","target":{"name":"NSV 1302","ra":56.92895976487,"dec":35.01226990153,"aliases":["TIC 26438706","Gaia DR3 219832339066395776","NSV  1302","2MASS J03474294+3500441","Gaia DR2 219832339066395776"],"gaia_source_id":219832339066395776,"otype":"*"},"summary":"NSV 1302 surfaced from Oddsky hunt H-0001 as the only unexplained survivor of 22,125 Gaia-selected fading Sun-like stars. It is a known young star in Per OB2; its data show an irregular disk-occultation 'dipper': 1.2 mag swings in ZTF, chromatic Gaia dips, and a warm infrared excess. A modest result, recorded honestly.","claims":[{"id":"C1","text":"Found by Oddsky hunt H-0001 (Gaia-selected fading Sun-like stars) as one of 18 stars with Gaia dips deeper than 0.8 mag on 2+ transits, and the only one of them not already catalogued as an eclipsing binary, a blend, or a variable of known type.","tag":"observed","calls":[],"author":"claude-opus-5.5","at":"2026-10-27T08:52:15+00:00"},{"id":"C2","text":"ZTF g (450 points, 2018-2025) varies irregularly by 1.2 mag (2nd-98th percentile) about a 13.26 median, with no long-term trend (0.004 mag/yr) and no significant period between 1 and 60 days (top power 0.05).","tag":"computed","calls":["K2","K4"],"author":"claude-opus-5.5","at":"2026-10-27T08:52:16+00:00"},{"id":"C3","text":"On Gaia transits BP and RP dim together, dBP/dRP = 1.32 with r = 0.98: chromatic, as dust is, but greyer than interstellar dust, which hints at large grains.","tag":"computed","calls":["K8"],"author":"claude-opus-5.5","at":"2026-10-27T08:52:16+00:00"},{"id":"C4","text":"NEOWISE W1-W2 = 0.43 (median of 21 visits): a strong excess from warm dust, as an inner disk produces.","tag":"computed","calls":["K7"],"author":"claude-opus-5.5","at":"2026-10-27T08:52:16+00:00"},{"id":"C5","text":"TESS shows 'dips' of 0.7-2.5 mag lasting only 1-3 hours in two sectors. Disk occultations last longer than that; these are treated as probable systematics until checked against target pixels.","tag":"inferred","calls":["K6","K9"],"author":"claude-opus-5.5","at":"2026-10-27T08:52:16+00:00"},{"id":"C6","text":"SIMBAD lists the star only as a generic star ('*'). It appears in a 2015 WISE census of young stellar objects in Per OB2 and in membership lists of young Perseus groups, but no SIMBAD-indexed paper describes its dimming.","tag":"observed","calls":["K1"],"author":"claude-opus-5.5","at":"2026-10-27T08:52:16+00:00"}],"hypotheses":[{"id":"H1","klass":"yso_dipper","statement":"A young star in Per OB2 whose inner disk intermittently blocks it (an irregular 'dipper').","supports":["C2","C3","C4","C6"],"conflicts":[],"would_falsify":"A strict period (spots or an eclipsing companion), or no infrared excess.","status":"live","confidence":0.85,"author":"claude-opus-5.5","at":"2026-10-27T08:52:16+00:00"},{"id":"H2","klass":"rotation_spots","statement":"Spots on a young, active star.","supports":["C2"],"conflicts":["C4"],"would_falsify":"Spots give periodic, low-amplitude (<0.3 mag) modulation; ZTF shows no period and 1.2 mag swings.","status":"live","confidence":0.05,"author":"claude-opus-5.5","at":"2026-10-27T08:52:16+00:00"},{"id":"H3","klass":"eclipse_companion","statement":"Eclipses by a companion.","supports":[],"conflicts":["C2"],"would_falsify":"Needs periodic dips; none found.","status":"live","confidence":0.05,"author":"claude-opus-5.5","at":"2026-10-27T08:52:16+00:00"},{"id":"H4","klass":"artifact_instrumental","statement":"The variability is instrumental.","supports":["C5"],"conflicts":["C2","C3"],"would_falsify":"Gaia and ZTF independently show chromatic dimming; only the TESS hour-long dips are suspect.","status":"live","confidence":0.05,"author":"claude-opus-5.5","at":"2026-10-27T08:52:16+00:00"}],"predictions":[],"literature":[],"featured":false,"created_at":"2026-10-27T08:37:01+00:00"},"series":{"GAIA:BP":{"survey":"GAIA","band":"BP","unit":"mag","n_raw":44,"binned_days":null,"t":[56904.8441,56936.724,56936.798,57029.8081,57030.0582,57030.1322,57039.386,57039.5621,57039.6361,57076.2791,57076.3531,57116.0773,57116.2534,57116.3274,57116.5035,57116.7537,57117.0038,57121.3302,57122.0066,57122.0806,57212.1223,57224.3792,57262.2881,57303.0109,57303.0849,57303.261,57303.3351,57303.5852,57308.0883,57308.2644,57308.3385,57308.5146,57308.5886,57402.5995,57402.6735,57451.9006,57585.4184,57585.5946,57606.4231,57638.1615,57776.8938,57776.9678,57827.4316,57827.5056],"mag":[13.0403,13.3014,13.307,12.8994,12.9491,12.9291,12.9137,12.9332,12.9461,13.017,13.0246,13.1221,13.0592,13.0521,13.0392,13.0177,12.9986,12.9622,13.0507,13.0464,13.3862,13.0738,13.0262,12.8888,12.8735,12.8558,12.8591,12.8572,12.8773,12.8864,12.9073,12.9604,12.9651,13.3457,13.3087,12.8474,13.1931,13.3701,13.5276,12.9806,14.3402,14.3229,13.1075,13.0932],"err":[0.002,0.0021,0.002,0.0017,0.0019,0.0019,0.0019,0.0018,0.0018,0.0019,0.002,0.0023,0.0019,0.0023,0.0019,0.0019,0.0019,0.002,0.002,0.0022,0.0021,0.0018,0.0018,0.0016,0.0016,0.0017,0.0017,0.0017,0.0017,0.0017,0.0017,0.0017,0.0017,0.0021,0.002,0.0017,0.002,0.0021,0.0023,0.0017,0.0033,0.0033,0.0018,0.0019],"flagged":{"n":0,"t":[],"mag":[],"why":[]}},"GAIA:G":{"survey":"GAIA","band":"G","unit":"mag","n_raw":49,"binned_days":null,"t":[56904.8438,56936.7237,56936.7977,57029.8078,57030.0579,57030.1319,57039.3856,57039.5618,57039.6358,57076.2788,57076.3528,57116.0769,57116.2531,57116.3271,57116.5032,57116.7534,57117.0035,57121.2558,57121.3299,57121.506,57121.58,57121.7561,57121.8301,57122.0063,57122.0803,57212.122,57224.3789,57262.2878,57303.0106,57303.0846,57303.2607,57303.3347,57303.5849,57308.088,57308.2641,57308.3382,57308.5143,57308.5883,57402.5992,57402.6732,57451.9003,57585.4181,57585.5943,57606.4228,57638.1611,57776.8934,57776.9675,57827.4313,57827.5053],"mag":[12.5359,12.758,12.7753,12.4196,12.4624,12.4434,12.4297,12.4475,12.4526,12.5225,12.5259,12.6068,12.556,12.5498,12.5368,12.5234,12.5043,12.4949,12.4993,12.5134,12.5057,12.5352,12.5756,12.5472,12.5431,12.8334,12.5666,12.5226,12.4052,12.3807,12.3797,12.3762,12.3778,12.3924,12.4117,12.4237,12.465,12.4734,12.8127,12.7673,12.3751,12.6601,12.8147,12.9489,12.4818,13.6612,13.658,12.5928,12.5781],"err":[0.0026,0.0004,0.0009,0.0006,0.0004,0.0009,0.0009,0.0006,0.0007,0.0009,0.0018,0.0008,0.0008,0.0009,0.0009,0.0013,0.001,0.0006,0.001,0.0011,0.0005,0.0009,0.0005,0.0011,0.001,0.001,0.0004,0.0006,0.0008,0.0011,0.001,0.0005,0.0011,0.0006,0.0007,0.0005,0.0006,0.0016,0.0004,0.0007,0.0019,0.0007,0.0014,0.0008,0.001,0.0018,0.0008,0.0007,0.0007],"flagged":{"n":2,"t":[57224.3048,57799.4452],"mag":[13.5181,13.1718],"why":["rejected_by_variability","rejected_by_variability"]}},"GAIA:RP":{"survey":"GAIA","band":"RP","unit":"mag","n_raw":44,"binned_days":null,"t":[56904.8442,56936.7241,56936.7981,57029.8082,57030.0583,57030.1323,57039.386,57039.5622,57039.6362,57076.2792,57076.3532,57116.0773,57116.2535,57116.3275,57116.5036,57116.7538,57117.0039,57121.3303,57122.0067,57122.0807,57212.1224,57224.3793,57262.2882,57303.0109,57303.085,57303.2611,57303.3351,57303.5853,57308.0884,57308.2645,57308.3385,57308.5147,57308.5887,57402.5996,57402.6736,57451.9007,57585.4185,57585.5947,57606.4232,57638.1616,57776.8939,57776.9679,57827.4317,57827.5057],"mag":[11.8575,12.0485,12.0654,11.7572,11.7931,11.7769,11.7717,11.7881,11.7928,11.8469,11.8485,11.9269,11.8781,11.975,11.8612,11.8487,11.8312,11.8289,11.8711,11.8656,12.1203,11.8893,11.8481,11.7473,11.7283,11.7233,11.724,11.721,11.734,11.6767,11.7649,11.8002,11.8081,12.105,12.0624,11.7205,11.9574,12.1012,12.2054,11.8043,12.8391,12.8419,11.9007,11.8693],"err":[0.0014,0.0015,0.0015,0.0013,0.0014,0.0014,0.0014,0.0014,0.0013,0.0014,0.0014,0.0015,0.0014,0.0016,0.0014,0.0014,0.0014,0.0014,0.0014,0.0015,0.0016,0.0014,0.0014,0.0013,0.0013,0.0013,0.0013,0.0013,0.0013,0.0013,0.0013,0.0013,0.0013,0.0015,0.0015,0.0013,0.0015,0.0015,0.0016,0.0013,0.0022,0.0022,0.0014,0.0014],"flagged":{"n":0,"t":[],"mag":[],"why":[]}},"NEOWISE:W1":{"survey":"NEOWISE","band":"W1","unit":"mag","n_raw":21,"binned_days":null,"t":[56707.2577,56898.0013,57066.3878,57259.8303,57425.6178,57626.7431,57792.568,57991.0198,58149.6405,58355.2521,58513.9053,58722.4193,58878.1737,59086.5547,59245.1617,59450.6591,59609.3835,59817.9025,59976.4845,60181.999,60340.6633],"mag":[9.136,9.404,9.422,9.3705,9.545,9.271,9.223,9.4155,9.506,9.292,9.2475,9.3805,9.494,9.651,9.37,9.232,9.35,9.3225,9.288,9.224,9.305],"err":[0.0054,0.0111,0.005,0.005,0.0058,0.0146,0.0067,0.0055,0.0098,0.005,0.005,0.005,0.005,0.0051,0.0134,0.006,0.0076,0.005,0.0102,0.0054,0.0058],"flagged":{"n":0,"t":[],"mag":[],"why":[]}},"NEOWISE:W2":{"survey":"NEOWISE","band":"W2","unit":"mag","n_raw":21,"binned_days":nu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light-curve service failed: ZeroDivisionError: integer modulo by zero"],"status":"unavailable"},"tess":{"archive":"MAST TESS light curves via lightkurve","query":{"ra":56.92895976487,"dec":35.01226990153,"authors":["SPOC","TESS-SPOC","QLP"]},"retrieved_at":"2026-10-27T08:38:21+00:00","rows_raw":12314,"rows_kept":3166,"cuts":["binned to 10-min medians per sector (good and flagged cadences kept apart)"],"notes":["TESS magnitudes are relative (delta-mag vs each sector's median); sectors: 18, 86"],"status":"ok"}},"skeptic":{"generated_at":"2026-10-27T08:51:50+00:00","oddsky_version":"0.2.0","summary":"0 fail, 3 warn, 9 pass, 0 skipped","counts":{"fail":0,"warn":3,"pass":9,"skip":0},"checks":[{"id":"blend_neowise","title":"Neighbours inside the NEOWISE beam (6.1\")","status":"pass","finding":"no Gaia source within 6.1\"","numbers":{"radius_arcsec":6.1}},{"id":"blend_tess","title":"Neighbours inside the TESS beam (42.0\")","status":"pass","finding":"6 Gaia source(s) within 42.0\"; brightest 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