NICER observation list: Target ID 450901

Abstract

SMC X-1 is thought to have a warped, precessing accretion disk (as evidenced by superorbital period modulations that range from 45-60 days). The superorbital period is projected to take a fourth excursion over the next 3 years, and over that time the superorbital period will change from ~60 days down to around 45 days. This implies that the accretion disk configuration is changing during this time. Previous work has well demonstrated that the shape of the soft pulse periods (i.e. the reprocessed emission) changes within a single 60 day cycle. This proposed program would use NICER to monitor the spectral shape and pulse profiles of SMC X-1 as the superorbital period takes a rare excursion and use this exceptional dataset to probe the physics of this warped, precessing accretion disk.
Obsid RA DEC l b Start End Exposure Number of
Modules		 Number of
Processing		 Status of
Processing		 Date of
Processing		 Public
date
4509010101 19.269 -73.444 300.416 -43.559 59305.3637 59305.6338 1006.0 52 5 VALIDATED 59314.8 59681
4509010102 19.272 -73.444 300.415 -43.559 59316.9053 59316.9819 1362.0 52 5 VALIDATED 59327.0 59692
4509010103 19.271 -73.444 300.415 -43.559 59317.0363 59317.0468 483.0 52 5 VALIDATED 59327.0 59693
4509010301 19.272 -73.444 300.415 -43.559 59328.1330 59328.5306 436.0 52 6 VALIDATED 59339.9 59703
4509010401 19.273 -73.443 300.414 -43.560 59341.5997 59341.7431 967.0 52 7 VALIDATED 59351.6 59716
4509010501 19.276 -73.442 300.413 -43.561 59350.3744 59350.6419 1446.0 52 7 VALIDATED 59360.7 59725
4509010601 19.271 -73.444 300.415 -43.559 59355.8163 59355.9542 1024.0 52 7 VALIDATED 59368.0 59731
4509010701 19.263 -73.441 300.418 -43.562 59371.3509 59371.4282 1279.0 52 6 VALIDATED 59381.9 59747
4509010801 19.269 -73.443 300.416 -43.559 59382.3936 59382.4736 1684.0 52 6 VALIDATED 59391.8 59758
4509010802 19.272 -73.444 300.415 -43.559 59393.7441 59393.8229 796.0 52 6 VALIDATED 59405.0 59768
4509010803 19.274 -73.444 300.414 -43.559 59406.4426 59406.4688 944.0 52 5 VALIDATED 59415.9 59781
4509010901 19.273 -73.443 300.414 -43.559 59417.4215 59417.5037 821.0 52 7 VALIDATED 59427.6 59792
4509011001 19.272 -73.442 300.414 -43.561 59427.2166 59427.3037 1235.0 52 8 VALIDATED 59472.0 59802
4509011101 19.270 -73.443 300.415 -43.560 59437.5525 59437.5667 1123.0 52 6 VALIDATED 59468.1 59812
4509011201 19.271 -73.440 300.415 -43.563 59450.7194 59450.7933 1327.0 52 6 VALIDATED 59460.7 59828
4509011301 19.270 -73.444 300.416 -43.559 59458.2125 59458.3519 1898.0 52 6 VALIDATED 59467.7 59652
4509011401 19.272 -73.444 300.415 -43.559 59469.3561 59469.4407 1476.0 52 4 VALIDATED 59478.8 59663
4509011501 19.273 -73.443 300.414 -43.559 59481.3694 59481.4502 350.0 52 5 VALIDATED 59490.7 59675
4509011502 19.271 -73.443 300.415 -43.559 59704.3981 59704.4745 1327.0 52 5 VALIDATED 59713.8 59898
4509011601 19.273 -73.443 300.414 -43.560 59492.1998 59492.2787 1107.0 52 5 VALIDATED 59501.7 59686
4509011701 19.271 -73.441 300.415 -43.561 59504.3312 59504.4113 2533.0 52 6 VALIDATED 59513.7 59698
4509011901 19.263 -73.443 300.418 -43.560 59525.6899 59525.8243 1259.0 52 6 VALIDATED 59536.9 59719
4509012001 19.257 -73.444 300.421 -43.559 59535.3694 59535.4579 955.0 52 3 VALIDATED 59545.1 59729
4509012101 19.274 -73.444 300.414 -43.559 59545.1223 59545.3942 1513.0 52 5 VALIDATED 59554.8 59739
4509012201 19.284 -73.446 300.411 -43.556 59558.8552 59558.9382 1476.0 52 7 VALIDATED 59568.6 59752
4509012301 19.274 -73.442 300.414 -43.560 59571.4324 59571.5197 2411.0 52 6 VALIDATED 59580.7 59765
4509012401 19.271 -73.441 300.415 -43.562 59584.2680 59584.3525 1474.0 52 6 VALIDATED 59593.8 59778
4509012501 19.261 -73.440 300.418 -43.564 59596.4589 59596.5463 708.0 52 7 VALIDATED 59615.7 59790
4509012601 19.271 -73.444 300.415 -43.559 59605.3009 59605.3843 316.0 52 5 VALIDATED 59614.9 59799
4509012701 19.272 -73.444 300.415 -43.559 59616.1234 59616.2032 586.0 52 6 VALIDATED 59625.7 59810
4509012801 19.274 -73.443 300.414 -43.559 59625.8066 59625.9458 1847.0 52 7 VALIDATED 59640.1 59819
4509012901 19.273 -73.443 300.414 -43.560 59638.5602 59638.6400 670.0 52 5 VALIDATED 59649.8 59832
4509013001 19.272 -73.443 300.415 -43.560 59648.4293 59648.5167 1802.0 52 4 VALIDATED 59662.2 59842
4509013101 19.267 -73.442 300.416 -43.561 59659.7826 59659.8134 1642.0 52 5 VALIDATED 59671.0 59853
4509013201 19.267 -73.444 300.417 -43.559 59674.8077 59674.9468 1649.0 52 6 VALIDATED 59684.7 59868
4509013301 19.268 -73.445 300.416 -43.558 59683.0627 59683.5185 1720.0 52 7 VALIDATED 59693.6 59877
4509013302 19.273 -73.444 300.415 -43.559 59692.2287 59692.3669 1648.0 52 6 VALIDATED 59702.8 59886
4509013601 19.278 -73.442 300.412 -43.560 59713.6824 59713.6940 723.0 52 7 VALIDATED 59723.6 59907
4509013801 19.265 -73.442 300.417 -43.561 59737.4817 59737.5655 1980.0 52 5 VALIDATED 59748.2 59931
4509013901 19.258 -73.443 300.420 -43.560 59748.9604 59748.9745 0.0 52 6 VALIDATED 59759.2 59942
4509013902 19.255 -73.443 300.421 -43.561 59749.0250 59749.0320 417.0 52 4 VALIDATED 59759.2 59943
4509013903 19.272 -73.444 300.415 -43.559 59758.5157 59758.9137 261.0 52 5 VALIDATED 59779.0 59952
4509013904 19.272 -73.443 300.415 -43.559 59759.0959 59759.1072 119.0 52 3 VALIDATED 59769.9 59953
4509014001 19.277 -73.446 300.413 -43.557 59769.9740 59769.9958 1668.0 52 5 VALIDATED 59782.9 59963
4509014002 19.277 -73.446 300.413 -43.557 59770.0386 59770.0604 1524.0 52 5 VALIDATED 59782.9 59964
4509014101 19.278 -73.443 300.412 -43.559 59781.4494 59781.5877 2049.0 52 6 VALIDATED 59792.1 59975
4509014201 19.271 -73.443 300.415 -43.560 59793.3880 59793.4660 1892.0 52 5 VALIDATED 59806.9 59987
4509014301 19.271 -73.443 300.415 -43.560 59801.1924 59801.2132 479.0 52 4 VALIDATED 59810.8 59995
4509014401 19.267 -73.442 300.416 -43.561 59811.7583 59811.8384 693.0 52 5 VALIDATED 59821.1 60005
4509014501 19.271 -73.444 300.415 -43.559 59822.3473 59822.4861 1857.0 52 2 VALIDATED 59829.9 60016
4509014601 19.271 -73.445 300.415 -43.558 59832.6431 59832.7792 2121.0 52 4 VALIDATED 59842.9 60026
4509014701 19.274 -73.443 300.414 -43.559 59848.5613 59848.6378 2001.0 52 5 VALIDATED 59858.8 60042