Swift MOC
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Roll Angle / Visibility Calculator

This table shows the default roll angle, and allowed range around this default value (min and max roll angles) for a target of given decimal RA and declination (J2000) for an entire year. All values are calulated at 12:00UT for each day. Only periods where the source is far enough away from the Sun to be observed are included in this table.

For each day, the distance from the Moon at 12:00UT is given, where this value is highlighted in red, the source is too close to the Moon to observe at that time of day.

Note this table does show Pole constraints. Please note all values are estimates and will need to be validated by the Swift planners.

Note: RA/Dec/Year not set, using defaults. Enter values in form below.



Valid Roll Angles for target RA=266, Dec=-29 in 2021
Day of Year Sun RA (deg) Sun Dec (deg) Sun Distance (deg) Moon Distance (deg) Roll (deg) Min Roll (deg) Max Roll (deg)
Object in Sun Constraint
32314.80-17.1046.1293.6886.1872.9999.36
33315.82-16.8147.1279.6486.3673.4099.33
34316.83-16.5248.1365.5686.5473.7999.30
35317.84-16.2249.1351.4886.7274.1699.28
36318.85-15.9250.1437.4586.8974.5299.27
37319.85-15.6251.1423.5687.0674.8699.26
38320.85-15.3152.1510.2787.2275.1999.25
39321.85-14.9953.166.8987.3875.5099.25
40322.85-14.6754.1619.3287.5375.8199.25
41323.84-14.3555.1732.7187.6876.1099.25
42324.83-14.0256.1746.0687.8276.3999.26
43325.81-13.6957.1859.2287.9676.6699.27
44326.79-13.3658.1872.1388.1076.9299.28
45327.77-13.0259.1984.7788.2477.1899.30
46328.75-12.6860.1997.1588.3777.4299.32
47329.72-12.3361.19109.2988.5077.6699.34
48330.69-11.9862.20121.2488.6377.8999.37
49331.66-11.6363.20133.0588.7578.1199.40
50332.62-11.2864.20144.7988.8878.3299.43
51333.58-10.9265.21156.4889.0078.5399.46
52334.54-10.5666.21167.9789.1178.7399.50
53335.49-10.1967.21175.1489.2378.9399.54
54336.45-9.8368.21165.6289.3579.1299.58
55337.40-9.4669.21153.2089.4679.3099.62
56338.34-9.0970.21140.1589.5779.4899.67
57339.29-8.7271.21126.6589.6879.6599.72
58340.23-8.3472.21112.7689.7979.8199.77
59341.17-7.9673.2198.5689.9079.9899.82
60342.11-7.5974.2184.1690.0180.1399.88
61343.05-7.2075.2169.6490.1180.2999.94
62343.98-6.8276.2155.1490.2280.43100.00
63344.91-6.4477.2040.7690.3280.58100.06
64345.84-6.0578.2026.6090.4280.72100.13
65346.77-5.6779.2012.9690.5280.85100.19
66347.70-5.2880.194.9590.6280.98100.27
67348.62-4.8981.1916.1090.7281.11100.34
68349.55-4.5082.1829.2390.8281.24100.41
69350.47-4.1183.1842.3590.9281.36100.49
70351.39-3.7184.1755.3391.0281.47100.57
71352.31-3.3285.1768.1391.1281.59100.66
72353.23-2.9386.1680.7491.2281.70100.74
73354.15-2.5387.1593.1591.3281.81100.83
74355.06-2.1488.15105.3791.4281.91100.92
75355.98-1.7489.14117.4191.5182.01101.01
76356.89-1.3590.13129.3191.6182.11101.11
77357.81-0.9591.12141.0991.7182.21101.21
78358.72-0.5592.11152.7991.8182.30101.31
79359.63-0.1693.10164.3591.9082.39101.42
800.550.2494.09174.5992.0082.48101.52
811.460.6395.08169.8892.1082.56101.64
822.371.0396.06158.0592.2082.64101.75
833.281.4297.05145.4692.2982.72101.87
844.191.8198.04132.3592.3982.80101.99
855.102.2199.02118.7692.4982.87102.11
866.012.60100.01104.7292.5982.94102.24
876.922.99100.9990.2792.6983.01102.37
887.833.38101.9875.5292.7983.08102.50
898.743.77102.9660.6192.8983.14102.64
909.654.16103.9445.6993.0083.21102.78
9110.564.54104.9230.9293.1083.27102.93
9211.474.93105.9116.5793.2083.32103.08
9312.385.31106.894.6793.3183.38103.23
9413.295.69107.8713.0393.4183.43103.39
9514.216.07108.8526.2593.5283.48103.56
9615.126.45109.8339.4193.6383.53103.73
9716.046.83110.8152.3393.7483.57103.90
9816.957.20111.7865.0493.8583.62104.08
9917.877.58112.7677.5493.9683.66104.26
10018.797.95113.7489.8794.0783.70104.45
10119.718.32114.71102.0394.1983.73104.65
10220.638.68115.69114.0694.3183.76104.85
10321.559.05116.67125.9794.4383.80105.06
10422.479.41117.64137.7994.5583.82105.27
10523.409.77118.61149.5294.6783.85105.49
10624.3210.12119.59161.1594.8083.87105.72
10725.2510.48120.56172.2294.9283.89105.96
10826.1810.83121.53173.1095.0583.91106.20
10927.1111.18122.50161.9395.1983.92106.45
11028.0411.52123.47149.7895.3283.93106.71
11128.9811.86124.44137.1895.4683.94106.98
11229.9112.20125.41124.1595.6083.95107.26
11330.8512.53126.38110.6495.7583.95107.55
11431.7912.86127.3496.6595.9083.95107.85
11532.7313.19128.3182.2096.0583.94108.16
11633.6813.52129.2867.3796.2183.93108.48
11734.6213.84130.2452.2996.3783.92108.81
11835.5714.15131.2137.1396.5383.91109.16
11936.5214.47132.1722.1396.7083.89109.52
12037.4714.77133.137.9896.8883.86109.90
12138.4215.08134.098.8697.0683.83110.29
12239.3815.38135.0522.3797.2583.80110.69
12340.3415.67136.0135.9597.4483.76111.12
12441.3015.97136.9749.1897.6483.72111.56
12542.2616.25137.9362.0697.8583.67112.03
12643.2316.54138.8974.6498.0683.61112.51
12744.2016.82139.8586.9798.2983.55113.02
12845.1717.09140.8199.1198.5283.49113.55
12946.1417.36141.76111.1098.7683.41114.11
13047.1217.62142.72122.9999.0183.33114.69
13148.0917.88143.67134.7999.2883.24115.31
13249.0718.14144.62146.5499.5583.14115.96
13350.0618.38145.57158.2199.8483.04116.64
13451.0418.63146.52169.60100.1482.92117.37
13552.0318.87147.47175.20100.4682.79118.13
13653.0219.10148.42164.99100.8082.65118.94
13754.0119.33149.37153.06101.1582.50119.79
13855.0119.55150.31140.76101.5282.34120.70
13956.0019.77151.26128.14101.9282.16121.67
14057.0019.98152.20115.17102.3481.97122.71
14158.0020.19153.14101.78102.7881.76123.81
14259.0020.39154.0887.95103.2681.53124.99
14360.0120.58155.0173.68103.7781.28126.26
14461.0220.77155.9559.01104.3181.01127.62
14562.0320.95156.8844.04104.9080.71129.09
14663.0421.13157.8128.94105.5380.38130.69
14764.0521.30158.7314.04106.2280.03132.41
14865.0721.46159.664.46106.9679.64134.29
14966.0821.62160.5716.93107.7779.21136.34
15067.1021.77161.4931.05108.6678.74138.58
15168.1221.91162.4044.85109.6478.22141.05
15269.1422.05163.3058.22110.7277.65143.78
15370.1722.19164.2071.17111.9277.02146.81
15471.2022.31165.0983.76113.2576.33150.18
15572.2222.43165.9796.04114.7575.56153.95
15673.2522.54166.84108.11116.4574.72158.19
15774.2822.65167.70120.01118.3873.79162.98
15875.3122.75168.54131.82120.5972.77168.42
15976.3522.84169.37143.57123.1571.67174.63
16077.3822.93170.16155.27126.1270.51181.73
16178.4223.01170.93166.82129.5969.32189.87
16279.4523.08171.66175.80133.6968.18199.19
16380.4923.15172.34167.77138.5367.26209.80
16481.5323.21172.96155.94144.2666.80221.72
16582.5723.26173.49143.69150.9967.23234.75
16683.6123.31173.92131.19158.7969.15248.42
16784.6523.35174.22118.44167.5773.28261.85
16885.6923.38174.37105.40177.0680.21273.91
16986.7323.40174.3792.05186.8090.04283.56
17087.7723.42174.2078.35196.25102.23290.28
17188.8123.43173.8964.28204.96115.70294.23
17289.8523.44173.4649.88212.68129.33296.03
17390.8923.43172.9235.22219.33142.27296.39
17491.9223.43172.3020.46224.99154.08295.89
17592.9623.41171.626.51229.77164.58294.95
17694.0023.39170.8910.76233.81173.81293.81
17795.0423.36170.1224.99237.24181.86292.63
17896.0823.32169.3339.24240.18188.89291.47
17997.1223.28168.5153.14242.71195.03290.38
18098.1523.23167.6766.61244.90200.42289.37
18199.1923.17166.8179.64246.81205.17288.45
182100.2223.10165.9492.29248.49209.38287.61
183101.2523.03165.07104.60249.98213.12286.85
184102.2922.96164.18116.67251.31216.46286.16
185103.3222.87163.29128.55252.50219.46285.53
186104.3522.78162.39140.34253.57222.17284.97
187105.3822.68161.48152.07254.54224.63284.45
188106.4022.58160.57163.70255.42226.86283.98
189107.4322.47159.66174.37256.23228.90283.56
190108.4522.35158.74170.73256.97230.77283.17
191109.4822.23157.82159.05257.65232.48282.82
192110.5022.10156.90146.76258.28234.07282.49
193111.5121.96155.97134.20258.86235.53282.20
194112.5321.82155.05121.40259.41236.89281.93
195113.5521.67154.12108.37259.91238.15281.68
196114.5621.52153.1995.13260.39239.33281.45
197115.5721.36152.2681.65260.83240.42281.24
198116.5821.19151.3267.94261.25241.45281.05
199117.5821.02150.3953.99261.64242.42280.87
200118.5920.84149.4539.83262.01243.32280.71
201119.5920.66148.5225.53262.37244.18280.56
202120.5920.47147.5811.39262.70244.98280.42
203121.5820.27146.645.75263.02245.74280.29
204122.5820.07145.7019.06263.32246.46280.17
205123.5719.86144.7633.30263.60247.14280.07
206124.5619.65143.8247.41263.88247.79279.97
207125.5419.43142.8861.22264.14248.40279.88
208126.5319.21141.9374.66264.39248.98279.80
209127.5118.98140.9987.71264.63249.54279.72
210128.4918.74140.05100.38264.86250.07279.66
211129.4618.50139.10112.73265.08250.58279.59
212130.4418.26138.15124.82265.30251.06279.54
213131.4118.01137.21136.72265.51251.52279.49
214132.3817.76136.26148.50265.70251.96279.45
215133.3517.50135.31160.18265.90252.39279.41
216134.3117.23134.37171.48266.08252.79279.37
217135.2716.97133.42173.91266.26253.18279.34
218136.2316.69132.47162.74266.44253.56279.32
219137.1916.42131.52150.49266.61253.92279.30
220138.1416.13130.57137.87266.77254.27279.28
221139.0915.85129.62124.96266.93254.60279.27
222140.0415.56128.66111.78267.09254.92279.26
223140.9915.26127.7198.37267.24255.23279.25
224141.9414.96126.7684.77267.39255.53279.25
225142.8814.66125.8171.00267.53255.82279.25
226143.8214.35124.8557.10267.67256.10279.25
227144.7614.04123.9043.11267.81256.37279.26
228145.6913.73122.9429.06267.95256.63279.27
229146.6313.41121.9915.12268.08256.88279.28
230147.5613.09121.033.98268.21257.12279.30
231148.4912.77120.0814.42268.34257.36279.31
232149.4112.44119.1228.30268.46257.58279.33
233150.3412.11118.1742.23268.58257.81279.36
234151.2611.77117.2156.01268.70258.02279.38
235152.1811.44116.2569.55268.82258.23279.41
236153.1011.10115.3082.79268.94258.43279.44
237154.0210.75114.3495.73269.05258.62279.48
238154.9310.41113.38108.34269.16258.81279.51
239155.8510.06112.42120.67269.27259.00279.55
240156.769.71111.46132.76269.38259.18279.59
241157.679.35110.50144.65269.49259.35279.63
242158.589.00109.54156.40269.60259.52279.68
243159.498.64108.58167.94269.71259.68279.73
244160.408.28107.61176.13269.81259.84279.78
245161.307.91106.65166.86269.91260.00279.83
246162.217.55105.69154.84270.02260.15279.88
247163.117.18104.72142.35270.12260.30279.94
248164.016.81103.76129.49270.22260.44280.00
249164.926.44102.79116.27270.32260.58280.06
250165.826.06101.83102.73270.42260.71280.12
251166.725.69100.8688.90270.52260.84280.19
252167.625.3199.9074.85270.62260.97280.26
253168.514.9398.9360.66270.71261.10280.33
254169.414.5597.9646.41270.81261.22280.40
255170.314.1796.9932.18270.91261.34280.48
256171.213.7996.0218.11271.00261.45280.56
257172.103.4195.065.16271.10261.56280.64
258173.003.0294.0911.10271.20261.67280.72
259173.902.6493.1224.64271.29261.78280.81
260174.792.2592.1538.30271.39261.88280.89
261175.691.8791.1851.84271.48261.98280.98
262176.591.4890.2065.21271.58262.08281.08
263177.481.0989.2378.38271.67262.17281.17
264178.380.7088.2691.33271.77262.26281.27
265179.280.3187.29104.03271.86262.35281.37
266180.17-0.0786.31116.49271.96262.44281.48
267181.07-0.4685.34128.72272.06262.52281.59
268181.97-0.8584.37140.74272.15262.61281.70
269182.87-1.2483.39152.60272.25262.69281.81
270183.77-1.6382.42164.26272.35262.76281.93
271184.67-2.0281.44174.99272.44262.84282.05
272185.57-2.4180.46170.86272.54262.91282.18
273186.47-2.8079.49159.23272.64262.98282.30
274187.38-3.1978.51147.05272.74263.05282.44
275188.28-3.5777.53134.50272.84263.11282.57
276189.19-3.9676.55121.56272.94263.18282.71
277190.10-4.3575.57108.19273.05263.24282.86
278191.01-4.7374.5994.40273.15263.30283.00
279191.92-5.1273.6180.25273.25263.35283.16
280192.83-5.5072.6365.80273.36263.40283.31
281193.75-5.8871.6551.16273.47263.46283.47
282194.66-6.2670.6636.47273.57263.51283.64
283195.58-6.6469.6821.90273.68263.55283.81
284196.50-7.0268.707.90273.79263.60283.99
285197.42-7.4067.718.03273.91263.64284.17
286198.35-7.7766.7321.56274.02263.68284.36
287199.27-8.1465.7535.21274.13263.71284.55
288200.20-8.5164.7648.67274.25263.75284.75
289201.13-8.8863.7861.90274.37263.78284.96
290202.07-9.2562.7974.91274.49263.81285.18
291203.00-9.6161.8087.72274.62263.84285.40
292203.94-9.9860.82100.33274.74263.86285.62
293204.88-10.3459.83112.76274.87263.88285.86
294205.82-10.6958.84125.00275.00263.90286.10
295206.77-11.0557.86137.08275.14263.92286.36
296207.72-11.4056.87149.00275.27263.93286.62
297208.67-11.7555.88160.76275.41263.94286.89
298209.62-12.0954.89172.11275.56263.95287.17
299210.58-12.4453.90174.19275.71263.95287.46
300211.54-12.7852.91163.06275.86263.95287.77
301212.51-13.1151.92151.19276.01263.94288.08
302213.47-13.4550.93139.02276.17263.94288.41
303214.44-13.7849.94126.53276.34263.92288.75
304215.42-14.1048.95113.64276.51263.91289.10
305216.39-14.4247.96100.31276.68263.89289.47
306217.37-14.7446.9686.51276.86263.86289.86
Object in Sun Constraint

Swift Mission Operations Center

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Swift MOC Team Leads

Mission Director: John Nousek
Science Operations: Jamie Kennea
Flight Operations: Mark Hilliard
UVOT: Michael Siegel
XRT: Jamie Kennea