Astronomy Datasets
Collection
Exoplanets, gravitational waves, pulsars, GRBs, FRBs, quasars, variable stars, and million-source radio/X-ray sky surveys in Parquet. • 104 items • Updated
Datasets:
source_number int64 1 170 | name large_stringlengths 16 16 | ra float64 1.73 359 | dec float64 -73.52 79.8 | lii float64 0.53 360 | bii float64 -72.18 88.1 | sb_significance float64 -2.1 802 | hb_significance float64 -8.9 1.27k | sb_flux float64 0 0 ⌀ | hb_flux float64 0 0 ⌀ | alt_name large_stringlengths 3 29 ⌀ | source_type large_stringclasses 13
values | maxi_gsc_name large_stringlengths 15 15 ⌀ | class int64 1k 10k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
6 | 1MAXIS J0116-735 | 19.16 | -73.52 | 300.472609 | -43.487703 | 5.9 | 12.3 | 0 | 0 | SMC X-1 | Binary pulsar | 2MAXI J0117-734 | 1,010 |
27 | 1MAXIS J0518-720 | 79.66 | -72.02 | 283.201241 | -32.815753 | 17.3 | 27.1 | 0 | 0 | LMC X-2 | Binary NS | 2MAXI J0520-719 | 1,000 |
31 | 1MAXIS J0536-697 | 84.2 | -69.72 | 280.211407 | -31.76338 | 36.4 | 31 | 0 | 0 | LMC X-1 | Binary BH | 2MAXI J0539-696 | 1,030 |
74 | 1MAXIS J1257-693 | 194.27 | -69.35 | 303.432507 | -6.483735 | 25.5 | 40.9 | 0 | 0 | 4U 1254-690 | Binary NS | null | 1,000 |
101 | 1MAXIS J1632-675 | 248.05 | -67.56 | 321.706824 | -13.151474 | 15 | 19.1 | 0 | 0 | 4U 1626-67 | Binary pulsar | 2MAXI J1632-674 | 1,010 |
28 | 1MAXIS J0531-661 | 82.98 | -66.12 | 276.051399 | -32.647056 | 15.5 | 8.5 | 0 | 0 | LMC X-4 | Binary pulsar | 2MAXI J0532-663 | 1,010 |
61 | 1MAXIS J1139-654 | 175 | -65.45 | 295.59665 | -3.600708 | 9.6 | 5.8 | 0 | 0 | 4U 1137-65 | Star | null | 2,900 |
65 | 1MAXIS J1216-652 | 184.06 | -65.26 | 299.257369 | -2.639676 | 7.5 | -0.6 | 0 | null | 4U 1210-64 | Binary NS | null | 1,000 |
102 | 1MAXIS J1638-644 | 249.64 | -64.43 | 324.56071 | -11.58836 | 9.2 | 13.6 | 0 | 0 | TrA Cluster | GC | 2MAXI J1638-643 | 5,000 |
32 | 1MAXIS J0538-641 | 84.65 | -64.18 | 273.691905 | -32.11314 | 25 | 21.9 | 0 | 0 | LMC X-3 | Binary BH | 2MAXI J0539-640 | 1,030 |
49 | 1MAXIS J0922-631 | 140.7 | -63.14 | 281.741488 | -9.213288 | 3.4 | 5.5 | null | 0 | 2S 0921-63 | Binary NS | null | 1,000 |
67 | 1MAXIS J1225-629 | 186.43 | -62.91 | 300.008858 | -0.184305 | 2.1 | 15.8 | null | 0 | GX 301-2 | Binary pulsar | null | 1,010 |
85 | 1MAXIS J1441-627 | 220.44 | -62.73 | 315.191509 | -2.514117 | 17.6 | 3 | 0 | null | RCW 86 | SNR | null | 3,200 |
92 | 1MAXIS J1547-626 | 236.82 | -62.67 | 321.636009 | -6.370828 | 25.8 | 36 | 0 | 0 | 4U 1543-624 | Binary NS/BH | null | 1,000 |
79 | 1MAXIS J1325-626 | 201.49 | -62.62 | 306.889159 | -0.013797 | 0 | 7.3 | null | 0 | 4U 1323-619 | Binary NS | null | 1,000 |
63 | 1MAXIS J1147-623 | 176.99 | -62.32 | 295.634063 | -0.35107 | 6.1 | 7.2 | 0 | 0 | 1E 1145.1-6141 | Binary pulsar | null | 1,010 |
76 | 1MAXIS J1300-617 | 195.18 | -61.72 | 304.031317 | 1.131933 | 0.3 | 23.2 | null | 0 | GX 304-1 | Binary pulsar | null | 1,010 |
19 | 1MAXIS J0430-613 | 67.61 | -61.36 | 272.068196 | -40.269699 | 5.8 | 4.2 | 0 | null | Abell 3266 | GC | 2MAXI J0431-613 | 5,000 |
57 | 1MAXIS J1102-610 | 165.5 | -61.05 | 290.076952 | -0.939598 | 6.2 | -8.9 | 0 | null | MSH 11-61A | SNR | null | 3,200 |
95 | 1MAXIS J1603-608 | 241 | -60.82 | 324.356843 | -6.232302 | 10.4 | 19.7 | 0 | 0 | 1H 1556-605 | Binary NS/BH | null | 1,000 |
96 | 1MAXIS J1610-608 | 242.69 | -60.81 | 324.974933 | -6.781912 | 14.1 | 19.2 | 0 | 0 | 2MASX J16115141-6037549 | AGN | null | 7,000 |
59 | 1MAXIS J1120-606 | 170.15 | -60.68 | 292.034585 | 0.255366 | 14.6 | 52.1 | 0 | 0 | Cen X-3 | Binary pulsar | null | 1,010 |
56 | 1MAXIS J1045-597 | 161.26 | -59.76 | 287.629894 | -0.697482 | 15.6 | 9.7 | 0 | 0 | Eta Car | Star | null | 2,900 |
60 | 1MAXIS J1123-593 | 170.96 | -59.37 | 291.97292 | 1.625039 | 22.4 | 21.8 | 0 | 0 | MSH 11-54 | SNR | null | 3,200 |
72 | 1MAXIS J1250-592 | 192.61 | -59.25 | 302.804105 | 3.621501 | 7.8 | 9.3 | 0 | 0 | 1A 1246-588 | Binary NS | null | 1,000 |
88 | 1MAXIS J1513-591 | 228.4 | -59.14 | 320.28274 | -1.143749 | 7 | 10.1 | 0 | 0 | PSR B1509-58 | Isolated pulsar | null | 1,800 |
9 | 1MAXIS J0246-584 | 41.61 | -58.47 | 278.337365 | -52.81658 | 6.8 | 0.4 | 0 | null | 2MAXI J0243-582 | Unknown | 2MAXI J0243-582 | 9,999 |
52 | 1MAXIS J1009-583 | 152.38 | -58.36 | 283.010477 | -1.896106 | 3 | 24 | null | 0 | GRO J1008-57 | Binary pulsar | null | 1,010 |
89 | 1MAXIS J1520-572 | 230.07 | -57.28 | 322.011763 | -0.028473 | 1.2 | 18.3 | null | 0 | Cir X-1 | Binary NS | null | 1,000 |
91 | 1MAXIS J1544-563 | 236.05 | -56.39 | 325.199683 | -1.179157 | 1.2 | 8.7 | null | 0 | MAXI J1543-564 | Binary BH | null | 1,030 |
48 | 1MAXIS J0920-553 | 140.09 | -55.3 | 275.910264 | -3.919113 | 13.4 | 15.9 | 0 | 0 | 1H 0918-548 | Binary NS | null | 1,000 |
103 | 1MAXIS J1640-538 | 250.18 | -53.8 | 332.858167 | -4.827243 | 40.1 | 59.4 | 0 | 0 | H 1636-536 | Binary NS | null | 1,000 |
90 | 1MAXIS J1541-525 | 235.49 | -52.52 | 327.286539 | 2.096373 | -0.8 | 12.6 | null | 0 | 4U 1538-52 | Binary pulsar | null | 1,010 |
97 | 1MAXIS J1612-524 | 243.11 | -52.47 | 330.863465 | -0.855823 | 44.1 | 107.1 | 0 | 0 | 4U 1608-52 | Binary NS | null | 1,000 |
44 | 1MAXIS J0850-461 | 132.56 | -46.19 | 265.954948 | -1.363388 | 27.6 | 7 | 0 | 0 | RX J0852.0-4622 | SNR | null | 3,200 |
104 | 1MAXIS J1645-456 | 251.41 | -45.67 | 339.525784 | -0.097153 | 11.6 | 160.3 | 0 | 0 | GX 340+0 | Binary NS | null | 1,000 |
43 | 1MAXIS J0834-455 | 128.65 | -45.54 | 263.765608 | -3.109362 | 19.4 | 15.6 | 0 | 0 | Vela Pulsar/SNR | Isolated pulsar/SNR | null | 1,800 |
118 | 1MAXIS J1738-444 | 264.7 | -44.49 | 346.003815 | -6.988709 | 60.4 | 102.6 | 0 | 0 | H 1735-444 | Binary NS | null | 1,000 |
110 | 1MAXIS J1708-440 | 257.13 | -44.09 | 343.288927 | -2.278837 | 36.9 | 127.3 | 0 | 0 | 4U 1705-440 | Binary NS | null | 1,000 |
78 | 1MAXIS J1325-431 | 201.39 | -43.15 | 309.515625 | 19.285124 | -1.5 | 11.5 | null | 0 | Cen A | AGN | 2MAXI J1325-429 | 7,000 |
42 | 1MAXIS J0822-429 | 125.71 | -42.94 | 260.420398 | -3.303371 | 152.1 | 19.1 | 0 | 0 | Pup A | SNR | null | 3,200 |
86 | 1MAXIS J1502-420 | 225.75 | -42.04 | 327.545158 | 14.458411 | 10.9 | 5.2 | 0 | 0 | SN 1006 | SNR | 2MAXI J1503-421 | 3,200 |
71 | 1MAXIS J1249-413 | 192.27 | -41.32 | 302.455929 | 21.54957 | 14.2 | 13.6 | 0 | 0 | Centaurus Cluster | GC | 2MAXI J1249-412 | 5,000 |
111 | 1MAXIS J1712-407 | 258.06 | -40.76 | 346.378402 | -0.856699 | 13.9 | 37.2 | 0 | 0 | 4U 1708-40 | Binary NS | null | 1,000 |
45 | 1MAXIS J0902-406 | 135.51 | -40.6 | 263.083051 | 3.889335 | 4 | 39 | null | 0 | Vela X-1 | Binary pulsar | null | 1,010 |
25 | 1MAXIS J0514-401 | 78.6 | -40.15 | 244.647576 | -34.995823 | 9 | 9.7 | 0 | 0 | 4U 0513-40 | Binary NS | 2MAXI J0514-399 | 1,000 |
113 | 1MAXIS J1713-399 | 258.32 | -39.94 | 347.158212 | -0.534756 | 16.8 | 33.2 | 0 | 0 | RX J1713.7-3946 | SNR | null | 3,200 |
131 | 1MAXIS J1825-371 | 276.37 | -37.15 | 356.782638 | -11.256209 | 2.9 | 18.6 | null | 0 | 4U 1822-371 V691 CrA | Binary NS | 2MAXI J1825-370 | 1,000 |
122 | 1MAXIS J1749-370 | 267.5 | -37.05 | 353.511345 | -4.967645 | 20.4 | 41.6 | 0 | 0 | 4U 1746-37 | Binary NS | null | 1,000 |
108 | 1MAXIS J1705-364 | 256.44 | -36.46 | 349.076341 | 2.723198 | 116.4 | 267.9 | 0 | 0 | GX 349+2 | Binary NS | null | 1,000 |
54 | 1MAXIS J1029-353 | 157.39 | -35.4 | 272.90203 | 19.067683 | 6.1 | 3.1 | 0 | null | 2MAXI J1030-351 | Unknown | 2MAXI J1030-351 | 9,999 |
16 | 1MAXIS J0339-353 | 54.83 | -35.39 | 236.608137 | -53.466789 | 9.5 | 3.6 | 0 | null | FORNAX | GC | null | 5,000 |
117 | 1MAXIS J1732-338 | 263.02 | -33.87 | 354.286676 | -0.190878 | 12.2 | 68.6 | 0 | 0 | GX 354-0 | Binary NS | null | 1,000 |
35 | 1MAXIS J0556-332 | 89.18 | -33.22 | 238.984413 | -25.206983 | 7.2 | 8.3 | 0 | 0 | MAXI J0556-332 | Binary NS | 2MAXI J0556-331 | 1,000 |
81 | 1MAXIS J1347-329 | 206.95 | -32.9 | 316.381286 | 28.495507 | 4.9 | 7.7 | null | 0 | Abell 3571 | GC | 2MAXI J1347-328 | 5,000 |
120 | 1MAXIS J1746-322 | 266.52 | -32.26 | 357.21271 | -1.814177 | 1.5 | 19.7 | null | 0 | H 1743-322 | Binary BH | null | 1,030 |
50 | 1MAXIS J0924-317 | 141.15 | -31.76 | 259.652953 | 13.231684 | 4.3 | 7.2 | null | 0 | X 0922-314 | Unknown | 2MAXI J0924-316 | 9,999 |
80 | 1MAXIS J1329-316 | 202.48 | -31.66 | 312.43472 | 30.500679 | 8.3 | 4.3 | 0 | null | Abell 3558 | GC | 2MAXI J1329-315 | 5,000 |
51 | 1MAXIS J0947-310 | 146.83 | -31.04 | 262.749901 | 17.11596 | 0.9 | 5.2 | null | 0 | MCG -05-23-016 | AGN | 2MAXI J0947-308 | 7,000 |
114 | 1MAXIS J1727-308 | 261.9 | -30.83 | 356.302113 | 2.274148 | 12.3 | 27.7 | 0 | 0 | Terzan 2/4U 1722-30 | Binary NS | null | 1,000 |
83 | 1MAXIS J1349-303 | 207.32 | -30.39 | 317.461977 | 30.844509 | 4 | 6.2 | null | 0 | IC 4329A | AGN | 2MAXI J1349-302 | 7,000 |
129 | 1MAXIS J1823-303 | 275.9 | -30.37 | 2.772835 | -7.903053 | 95.2 | 143.6 | 0 | 0 | NGC 6624 | Binary NS | null | 1,000 |
73 | 1MAXIS J1253-295 | 193.45 | -29.52 | 303.547071 | 33.348927 | 8.7 | 12.4 | 0 | 0 | EX Hya | Binary WD | 2MAXI J1252-291 | 1,600 |
119 | 1MAXIS J1745-292 | 266.4 | -29.26 | 359.721328 | -0.165003 | 1.1 | 85.4 | null | 0 | KS 1741-293 | Binary NS | null | 1,000 |
55 | 1MAXIS J1036-274 | 159.24 | -27.43 | 269.592604 | 26.599141 | 7.5 | 5.3 | 0 | 0 | Abell 1060 | GC | 2MAXI J1036-275 | 5,000 |
121 | 1MAXIS J1747-267 | 266.94 | -26.78 | 2.088497 | 0.714959 | 44.5 | 177.7 | 0 | 0 | GX 3+1 | Binary NS | null | 1,000 |
124 | 1MAXIS J1801-250 | 270.28 | -25.09 | 5.065894 | -1.020594 | 50.7 | 313.3 | 0 | 0 | GX 5-1 | Binary NS | null | 1,000 |
143 | 1MAXIS J1900-249 | 285.03 | -24.95 | 11.274969 | -12.879879 | 26.3 | 27.5 | 0 | 0 | HETE J1900.1-2455 | Binary NS | 2MAXI J1900-248 | 1,000 |
132 | 1MAXIS J1829-238 | 277.37 | -23.83 | 9.243841 | -6.104827 | 17.2 | 40.2 | 0 | 0 | GS 1826-238 | Binary NS | null | 1,000 |
112 | 1MAXIS J1712-234 | 258.09 | -23.41 | 0.526309 | 9.26597 | 22.2 | 34.9 | 0 | 0 | Ophiuchus Cluster | GC | null | 5,000 |
126 | 1MAXIS J1811-229 | 272.87 | -22.98 | 8.062467 | -2.056694 | 5.6 | 7.6 | 0 | 0 | V5588 Sgr | Binary WD | null | 1,600 |
115 | 1MAXIS J1730-215 | 262.73 | -21.59 | 4.463759 | 6.71955 | 14.5 | 2.1 | 0 | null | Kepler SNR | SNR | null | 3,200 |
125 | 1MAXIS J1801-205 | 270.38 | -20.52 | 9.08239 | 1.161864 | 58.6 | 229.6 | 0 | 0 | GX 9+1 | Binary NS | null | 1,000 |
134 | 1MAXIS J1835-193 | 278.94 | -19.31 | 13.958104 | -5.357625 | 9.8 | 5.8 | 0 | 0 | MAXI J1836-194 | Binary BH | null | 1,030 |
127 | 1MAXIS J1814-171 | 273.64 | -17.15 | 13.526942 | 0.102731 | 31.3 | 176.1 | 0 | 0 | GX 13+1 | Binary NS | null | 1,000 |
116 | 1MAXIS J1731-169 | 262.93 | -16.96 | 8.512136 | 9.04199 | 93.9 | 148.6 | 0 | 0 | GX 9+9 | Binary NS | null | 1,000 |
77 | 1MAXIS J1316-163 | 199.09 | -16.33 | 311.574229 | 46.123126 | 5.9 | 2.8 | 0 | null | NGC 5044 | GC | null | 5,000 |
99 | 1MAXIS J1619-156 | 244.98 | -15.63 | 359.103167 | 23.790584 | 801.6 | 1,270.3 | 0 | 0 | Sco X-1 | Binary NS | 2MAXI J1619-155 | 1,000 |
128 | 1MAXIS J1816-140 | 274.01 | -14.03 | 16.439657 | 1.277036 | 58.6 | 250.6 | 0 | 0 | GX 17+2 | Binary NS | null | 1,000 |
20 | 1MAXIS J0433-132 | 68.39 | -13.27 | 209.587356 | -36.507024 | 8.1 | 4.9 | 0 | null | Abell 496 | GC | 2MAXI J0433-131 | 5,000 |
47 | 1MAXIS J0917-120 | 139.44 | -12.06 | 242.839127 | 25.050229 | 6.3 | 5.2 | 0 | 0 | MAXI J0918-121 | Unknown | 2MAXI J0918-119 | 9,999 |
159 | 1MAXIS J2044-106 | 311.05 | -10.68 | 36.021016 | -29.845066 | 6 | 6.5 | 0 | 0 | Mrk 509 | AGN | 2MAXI J2044-106 | 7,000 |
133 | 1MAXIS J1832-103 | 278.09 | -10.31 | 21.594072 | -0.504447 | -1.3 | 9.6 | null | 0 | G21.5-0.9 | SNR | null | 3,200 |
46 | 1MAXIS J0908-097 | 137.23 | -9.77 | 239.384011 | 24.693979 | 7.4 | 7.5 | 0 | 0 | Abell 754 | GC | 2MAXI J0909-096 | 5,000 |
4 | 1MAXIS J0042-094 | 10.52 | -9.45 | 115.369424 | -72.184205 | 8.1 | 4.9 | 0 | null | Abell 85 | GC | 2MAXI J0041-092 | 5,000 |
140 | 1MAXIS J1853-086 | 283.27 | -8.69 | 25.369288 | -4.312555 | 12.3 | 11.2 | 0 | 0 | 4U 1850-086 | Binary NS | null | 1,000 |
41 | 1MAXIS J0817-075 | 124.4 | -7.58 | 230.014933 | 15.293453 | 6.7 | 5.4 | 0 | 0 | Abell 644 | GC | 2MAXI J0817-074 | 5,000 |
34 | 1MAXIS J0551-074 | 87.97 | -7.48 | 212.91328 | -16.624683 | 0.5 | 5.7 | null | 0 | NGC 2110 | AGN | 2MAXI J0552-073 | 7,000 |
152 | 1MAXIS J1937-062 | 294.4 | -6.22 | 32.594301 | -13.085678 | 5 | 1.5 | 0 | null | 1H 1934-063 | AGN | 2MAXI J1937-060 | 7,000 |
137 | 1MAXIS J1844-058 | 281.03 | -5.81 | 26.928217 | -1.025206 | 8.9 | 7.8 | 0 | 0 | null | null | null | 9,999 |
144 | 1MAXIS J1910-057 | 287.61 | -5.78 | 29.92637 | -6.84901 | 114.9 | 80.9 | 0 | 0 | MAXI J1910-057 | Binary BH | null | 1,030 |
30 | 1MAXIS J0535-054 | 83.78 | -5.4 | 209.002051 | -19.422991 | 15.9 | 10.6 | 0 | 0 | 2MAXI J0535-052 | Star cluster | 2MAXI J0535-052 | 3,600 |
136 | 1MAXIS J1841-053 | 280.33 | -5.3 | 27.063325 | -0.172414 | 7.3 | 13 | 0 | 0 | 1E 1841-045 | Isolated pulsar | null | 1,800 |
98 | 1MAXIS J1614+338 | 243.67 | 33.89 | 54.712121 | 46.144299 | 8.4 | 1.2 | 0 | null | HB89 1611+343 | AGN | null | 7,000 |
148 | 1MAXIS J1918-051 | 289.74 | -5.18 | 31.428564 | -8.473558 | 6.6 | 12.2 | 0 | 0 | 4U 1916-053 | Binary NS | null | 1,000 |
53 | 1MAXIS J1020-038 | 155.12 | -3.81 | 247.380791 | 42.217714 | 2.3 | 5.6 | null | 0 | 2MAXI J1020-034 | AGN | 2MAXI J1020-034 | 7,000 |
22 | 1MAXIS J0451-037 | 72.91 | -3.75 | 201.875423 | -28.241289 | 2.2 | 5.9 | null | 0 | MCG -01-13-025 | AGN | 2MAXI J0450-035 | 7,000 |
84 | 1MAXIS J1413-033 | 213.46 | -3.31 | 339.271172 | 53.645181 | 0 | 8.4 | null | 0 | NGC 5506 | AGN | 2MAXI J1413-030 | 7,000 |
167 | 1MAXIS J2256-030 | 344.11 | -3.07 | 69.133295 | -53.473443 | 2.8 | 6.4 | null | 0 | AO Psc | Binary WD | 2MAXI J2255-030 | 1,600 |
138 | 1MAXIS J1846-029 | 281.59 | -2.97 | 29.710077 | -0.225453 | 0.8 | 11.3 | null | 0 | AX J1844.8-0258/AX J1845-0258 | Binary NS/BH | null | 1,000 |
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MAXI X-ray Source Catalog
Credit: NASA/JPL-Caltech
Part of a dataset collection on Hugging Face.
Dataset description
The MAXI (Monitor of All-sky X-ray Image) Source Catalog from HEASARC — the persistent and transient X-ray sources detected by the JAXA-led MAXI instrument continuously scanning the sky from the International Space Station since August 2009.
MAXI's Gas Slit Camera (GSC) provides daily all-sky coverage at 2-30 keV with the largest field of view of any operating X-ray instrument, making it the workhorse monitor for detecting X-ray novae, transient outbursts of black-hole and neutron-star binaries, and gamma-ray burst afterglows. The Source Catalog (SSC) compiles the persistent source population MAXI has characterized over long baselines: X-ray binaries dominated by the Galactic plane, plus a substantial AGN component at high Galactic latitudes. Each row records the source designation, J2000 sky position, soft- and hard-band detection significance and average fluxes, an alternative identifier from cross-matching, and a physical type classification.
This dataset is the natural companion to juliensimon/swift-bat-hard-xray-survey (hard X-ray all-sky survey from Swift/BAT), juliensimon/chandra-x-ray-sources (focused-pointing Chandra catalog), and juliensimon/4xmm-dr14-xray-sources (XMM-Newton serendipitous catalog), covering complementary energy bands and observation modes for the X-ray sky.
This dataset is suitable for tabular classification tasks.
Schema
| Column | Type | Description | Sample | Null % |
|---|---|---|---|---|
source_number |
int64 | MAXI source catalog sequence number (integer); identifies the source within the SSC release | 6 | 0.0% |
name |
str | Primary MAXI source designation in the '1MAXIS Jhhmm+ddmm' format following IAU conventions for transient X-ray monitor catalogs | 1MAXIS J0116-735 | 0.0% |
ra |
float64 | Right ascension (degrees, J2000, 0-360) | 19.16 | 0.0% |
dec |
float64 | Declination (degrees, J2000, -90 to +90) | -73.52 | 0.0% |
lii |
float64 | Galactic longitude (degrees, 0-360); concentration near the Galactic plane traces the X-ray binary population | 300.47260899 | 0.0% |
bii |
float64 | Galactic latitude (degrees, -90 to +90); off-plane sources are predominantly AGN | -43.4877034 | 0.0% |
sb_significance |
float64 | Detection significance in the MAXI soft band (2-4 keV) in standard deviations; values above 5 indicate a robust detection | 5.9 | 0.0% |
hb_significance |
float64 | Detection significance in the MAXI hard band (4-10 keV) in standard deviations | 12.3 | 0.0% |
sb_flux |
float64 | Average source flux in the soft band (2-4 keV) in erg cm^-2 s^-1; computed from long-term GSC scanning data | 2.3e-11 | 17.6% |
hb_flux |
float64 | Average source flux in the hard band (4-10 keV) in erg cm^-2 s^-1 | 1.3e-10 | 18.8% |
alt_name |
str | Alternative source identifier from cross-matching with established X-ray catalogs (e.g. 'SMC X-1', 'LMC X-2', 'Cyg X-3') | SMC X-1 | 1.2% |
source_type |
str | Astrophysical source classification (e.g. 'Binary pulsar', 'Binary NS', 'Binary BH', 'CV', 'AGN', 'Galaxy cluster') | Binary pulsar | 1.2% |
maxi_gsc_name |
str | Designation in the parallel MAXI/GSC long-term survey catalog (e.g. '2MAXI J0117-734'); links the SSC entry to the time-resolved photometry product | 2MAXI J0117-734 | 57.1% |
class |
int64 | Numeric source-class code corresponding to source_type | 1010 | 0.0% |
Quick stats
- 170 MAXI X-ray sources detected by the all-sky GSC monitor on the ISS
- 168 sources with assigned astrophysical classifications
- Top source types: Binary NS (40), GC (29), AGN (22), SNR (20), Binary pulsar (14), Binary BH (11)
- Soft-band (2-4 keV) detection significance ranges from -2.1 to 801.6 sigma
- Hard-band (4-10 keV) fluxes span 1.40e-11 to 2.06e-07 erg cm^-2 s^-1 — six orders of magnitude across the persistent X-ray sky
Usage
from datasets import load_dataset
ds = load_dataset("juliensimon/maxi-xray-sources", split="train")
df = ds.to_pandas()
from datasets import load_dataset
import matplotlib.pyplot as plt
ds = load_dataset("juliensimon/maxi-xray-sources", split="train").to_pandas()
# Hardness-flux diagram colored by source class
fig, ax = plt.subplots(figsize=(8, 6))
for src_type, sub in ds.dropna(subset=["sb_flux", "hb_flux"]).groupby("source_type"):
ax.scatter(sub["sb_flux"], sub["hb_flux"], label=src_type, s=40, alpha=0.7)
ax.set_xscale("log")
ax.set_yscale("log")
ax.set_xlabel("Soft band flux (2-4 keV) [erg cm$^{-2}$ s$^{-1}$]")
ax.set_ylabel("Hard band flux (4-10 keV) [erg cm$^{-2}$ s$^{-1}$]")
ax.set_title("MAXI all-sky X-ray monitor — persistent source population")
ax.legend(fontsize=8, loc="lower right")
plt.tight_layout()
plt.show()
Data source
https://heasarc.gsfc.nasa.gov/W3Browse/all/maxissccat.html
Update schedule
Quarterly
Related datasets
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About the author
Created by Julien Simon — AI Operating Partner at Fortino Capital. Part of the Space Datasets collection.
Citation
@dataset{maxi_xray_sources,
title = {MAXI X-ray Source Catalog},
author = {juliensimon},
year = {2026},
url = {https://huggingface.co/datasets/juliensimon/maxi-xray-sources},
publisher = {Hugging Face}
}
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