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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.

RA: Dec:
Year:


Valid Roll Angles for target RA=266, Dec=-29 in 2020
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
33315.05-17.0346.36134.2886.2273.1099.35
34316.07-16.7447.37146.3186.4173.5099.32
35317.08-16.4548.38158.4486.5973.8899.30
36318.09-16.1549.38169.9186.7674.2599.28
37319.10-15.8550.39171.2786.9374.6099.26
38320.10-15.5451.39159.4187.1074.9499.25
39321.10-15.2352.40145.6387.2675.2799.25
40322.10-14.9153.40131.2387.4175.5899.25
41323.09-14.5954.41116.5187.5675.8899.25
42324.08-14.2755.41101.6587.7176.1799.25
43325.07-13.9456.4286.8087.8676.4599.26
44326.05-13.6157.4272.1388.0076.7299.27
45327.03-13.2758.4257.7388.1376.9899.29
46328.01-12.9359.4343.7188.2777.2499.30
47328.98-12.5960.4330.1488.4077.4899.32
48329.95-12.2561.4417.2588.5377.7199.35
49330.92-11.9062.447.1388.6677.9499.37
50331.89-11.5463.4412.0388.7878.1699.40
51332.85-11.1964.4523.6688.9078.3799.43
52333.81-10.8365.4535.8089.0278.5899.47
53334.77-10.4766.4547.9489.1478.7899.51
54335.72-10.1167.4559.9889.2678.9799.55
55336.68-9.7468.4571.9289.3779.1699.59
56337.63-9.3769.4683.7789.4979.3499.63
57338.57-9.0070.4695.5489.6079.5299.68
58339.52-8.6271.46107.2789.7179.6999.73
59340.46-8.2572.46119.0089.8279.8599.78
60341.40-7.8773.46130.7689.9280.0199.84
61342.34-7.4974.46142.6090.0380.1799.89
62343.28-7.1175.45154.4990.1480.3299.95
63344.21-6.7376.45166.1790.2480.47100.01
64345.14-6.3477.45173.5790.3480.61100.08
65346.07-5.9678.45164.8390.4580.75100.14
66347.00-5.5779.44151.8190.5580.88100.21
67347.93-5.1880.44137.8790.6581.02100.28
68348.85-4.7981.43123.3790.7581.14100.36
69349.77-4.4082.43108.4790.8581.27100.43
70350.70-4.0183.4293.3690.9581.39100.51
71351.62-3.6284.4278.2091.0581.50100.59
72352.54-3.2285.4163.1891.1581.61100.68
73353.45-2.8386.4048.4791.2481.72100.76
74354.37-2.4487.4034.2191.3481.83100.85
75355.29-2.0488.3920.6191.4481.94100.94
76356.20-1.6589.388.7591.5482.04101.04
77357.12-1.2590.379.4891.6382.13101.13
78358.03-0.8591.3620.8391.7382.23101.23
79358.94-0.4692.3532.9591.8382.32101.34
80359.85-0.0693.3445.0591.9382.41101.44
810.770.3394.3357.0492.0282.50101.55
821.680.7395.3268.9492.1282.58101.66
832.591.1296.3080.7692.2282.66101.78
843.501.5297.2992.5392.3282.74101.90
854.411.9198.28104.2792.4282.82102.02
865.322.3099.26116.0292.5282.89102.14
876.232.69100.25127.7992.6282.96102.27
887.143.08101.23139.6192.7283.03102.40
898.053.47102.22151.4592.8283.10102.54
908.963.86103.20163.1892.9283.16102.68
919.874.25104.19173.0793.0283.22102.82
9210.784.64105.17168.6793.1283.28102.97
9311.705.02106.15156.5593.2383.34103.12
9412.615.41107.13143.3193.3383.39103.27
9513.525.79108.11129.4693.4483.44103.43
9614.436.17109.09115.1093.5583.49103.60
9715.356.55110.07100.3393.6583.54103.77
9816.266.92111.0585.2793.7683.59103.94
9917.187.30112.0270.0993.8883.63104.12
10018.107.67113.0054.9793.9983.67104.31
10119.018.04113.9840.1194.1083.71104.50
10219.938.41114.9525.7294.2283.74104.70
10320.858.77115.9312.3794.3483.77104.90
10421.779.14116.906.7294.4683.80105.11
10522.709.50117.8817.2894.5883.83105.32
10623.629.85118.8529.6594.7083.85105.55
10724.5510.21119.8241.9494.8383.88105.78
10825.4810.56120.7954.0494.9583.90106.01
10926.4110.91121.7665.9895.0983.91106.26
11027.3411.26122.7477.8195.2283.93106.51
11128.2711.60123.7189.5795.3683.94106.78
11229.2011.94124.68101.3095.5083.94107.05
11330.1412.28125.64113.0695.6483.95107.33
11431.0812.61126.61124.8695.7883.95107.62
11532.0212.94127.58136.7395.9383.95107.92
11632.9613.27128.55148.6596.0983.94108.23
11733.9113.59129.51160.5296.2583.93108.56
11834.8513.91130.48171.4596.4183.92108.90
11935.8014.23131.44171.2596.5783.90109.25
12036.7514.54132.41159.8396.7583.88109.61
12137.7014.85133.37147.0596.9283.86109.99
12238.6615.15134.33133.7597.1183.83110.39
12339.6215.45135.29120.0197.2983.79110.80
12440.5815.75136.25105.8897.4983.75111.23
12541.5416.04137.2191.3997.6983.71111.68
12642.5016.32138.1776.6397.9083.66112.14
12743.4716.61139.1361.7198.1283.60112.63
12844.4316.88140.0846.7998.3483.54113.15
12945.4117.15141.0432.0798.5883.47113.69
13046.3817.42141.9917.8998.8283.39114.25
13147.3517.69142.956.4399.0883.31114.84
13248.3317.94143.9012.6499.3483.22115.47
13349.3118.20144.8525.2599.6283.12116.12
13450.2918.44145.8037.9499.9183.01116.82
13551.2818.69146.7550.36100.2282.89117.55
13652.2718.92147.7062.53100.5482.76118.32
13753.2619.16148.6574.48100.8882.62119.14
13854.2519.38149.6086.30101.2482.47120.01
13955.2419.60150.5498.06101.6282.30120.93
14056.2419.82151.48109.81102.0282.12121.92
14157.2420.03152.43121.62102.4481.92122.97
14258.2420.23153.37133.50102.9081.71124.09
14359.2520.43154.30145.49103.3881.47125.29
14460.2520.63155.24157.50103.9081.22126.58
14561.2620.81156.17169.06104.4580.94127.97
14662.2720.99157.11173.24105.0580.63129.47
14763.2821.17158.03162.68105.7080.30131.10
14864.3021.34158.96150.02106.4079.94132.86
14965.3221.50159.88136.87107.1679.54134.78
15066.3321.65160.80123.41107.9979.10136.87
15167.3521.80161.71109.67108.9078.62139.17
15268.3721.95162.6295.68109.9078.09141.70
15369.4022.09163.5281.45111.0077.51144.50
15470.4222.22164.4267.03112.2376.86147.60
15571.4522.34165.3152.52113.6176.15151.07
15672.4822.46166.1938.02115.1575.37154.94
15773.5022.57167.0523.75116.9074.50159.31
15874.5422.68167.9110.43118.9073.55164.25
15975.5722.77168.747.97121.1972.51169.86
16076.6022.86169.5620.04123.8371.40176.27
16177.6322.95170.3533.04126.9170.22183.60
16278.6723.03171.1145.85130.5369.04192.01
16379.7023.10171.8358.35134.7967.94201.63
16480.7423.16172.4970.57139.8367.10212.55
16581.7823.22173.0982.56145.7866.81224.75
16682.8223.27173.6094.41152.7767.54237.99
16783.8623.32174.00106.18160.8169.93251.69
16884.9023.35174.27117.96169.7974.68264.90
16985.9423.38174.38129.80179.3982.32276.47
17086.9823.41174.34141.76189.1192.80285.43
17188.0223.42174.14153.81198.43105.40291.45
17289.0623.43173.80165.73206.92119.01294.82
17390.1023.44173.33174.17214.38132.54296.21
17491.1423.43172.77165.99220.79145.25296.32
17592.1823.42172.14153.36226.22156.76295.68
17693.2223.40171.45140.10230.81166.95294.68
17794.2623.38170.71126.55234.70175.88293.52
17895.2923.35169.93112.79238.00183.67292.33
17996.3323.31169.1398.88240.83190.47291.19
18097.3723.26168.3084.85243.27196.42290.12
18198.4123.21167.4670.75245.39201.65289.13
18299.4423.15166.6056.60247.24206.25288.23
183100.4823.09165.7342.47248.87210.33287.41
184101.5123.02164.8528.47250.32213.97286.67
185102.5422.94163.9614.94251.61217.23285.99
186103.5722.85163.075.83252.77220.15285.39
187104.6022.76162.1715.12253.81222.79284.83
188105.6322.66161.2628.03254.76225.19284.33
189106.6522.55160.3541.00255.62227.37283.87
190107.6822.44159.4453.75256.41229.36283.46
191108.7022.32158.5266.22257.14231.19283.08
192109.7222.20157.6078.43257.80232.87282.73
193110.7422.07156.6890.44258.42234.43282.42
194111.7621.93155.75102.29259.00235.86282.13
195112.7721.79154.83114.07259.53237.20281.86
196113.7921.64153.90125.85260.03238.44281.62
197114.8021.48152.97137.70260.49239.59281.40
198115.8121.32152.03149.66260.93240.68281.19
199116.8221.15151.10161.64261.34241.69281.00
200117.8220.98150.16172.49261.73242.64280.83
201118.8320.80149.23169.92262.10243.53280.67
202119.8320.61148.29157.68262.45244.37280.52
203120.8320.42147.35144.35262.78245.17280.38
204121.8220.22146.41130.59263.09245.92280.26
205122.8220.02145.47116.57263.39246.63280.15
206123.8119.81144.53102.40263.67247.30280.04
207124.8019.59143.5988.16263.94247.94279.95
208125.7819.38142.6573.93264.20248.54279.86
209126.7719.15141.7059.77264.45249.12279.78
210127.7518.92140.7645.73264.69249.67279.71
211128.7318.69139.8131.89264.92250.19279.64
212129.7018.44138.8718.42265.14250.69279.58
213130.6818.20137.926.91265.35251.17279.53
214131.6517.95136.9811.33265.55251.63279.48
215132.6217.69136.0323.80265.75252.07279.43
216133.5817.43135.0836.66265.94252.49279.40
217134.5417.17134.1349.41266.13252.89279.36
218135.5016.90133.1961.97266.31253.28279.33
219136.4616.63132.2474.31266.48253.65279.31
220137.4216.35131.2986.45266.65254.00279.29
221138.3716.06130.3498.41266.81254.35279.27
222139.3215.78129.39110.24266.97254.68279.26
223140.2715.49128.44122.00267.12255.00279.25
224141.2215.19127.48133.76267.28255.30279.25
225142.1614.89126.53145.57267.42255.60279.25
226143.1014.59125.58157.42267.57255.89279.25
227144.0414.28124.63168.94267.71256.16279.25
228144.9813.97123.67173.44267.84256.43279.26
229145.9213.66122.72162.71267.98256.69279.27
230146.8513.34121.76149.63268.11256.94279.28
231147.7813.01120.81135.90268.24257.18279.30
232148.7112.69119.85121.74268.36257.41279.32
233149.6412.36118.89107.29268.49257.64279.34
234150.5612.03117.9492.68268.61257.86279.36
235151.4811.69116.9878.03268.73258.07279.39
236152.4011.35116.0263.46268.85258.28279.42
237153.3211.01115.0649.07268.96258.48279.45
238154.2410.67114.1034.98269.08258.67279.49
239155.1610.32113.1421.31269.19258.86279.52
240156.079.97112.188.87269.30259.04279.56
241156.989.62111.228.63269.41259.22279.60
242157.899.27110.2620.53269.52259.39279.65
243158.808.91109.3033.20269.63259.56279.69
244159.718.55108.3445.83269.73259.72279.74
245160.628.19107.3858.31269.84259.88279.79
246161.527.82106.4270.64269.94260.03279.84
247162.437.46105.4582.80270.04260.18279.90
248163.337.09104.4994.80270.14260.33279.95
249164.236.72103.53106.69270.24260.47280.01
250165.136.35102.56118.48270.34260.61280.08
251166.035.97101.60130.22270.44260.74280.14
252166.935.60100.63141.95270.54260.87280.21
253167.835.2299.67153.68270.64261.00280.28
254168.734.8498.70165.28270.74261.13280.35
255169.634.4697.73174.36270.83261.25280.42
256170.524.0896.76167.43270.93261.36280.50
257171.423.7095.79155.02271.03261.48280.57
258172.323.3294.83141.72271.12261.59280.66
259173.212.9393.86127.85271.22261.70280.74
260174.112.5592.89113.50271.31261.80280.83
261175.012.1691.9198.79271.41261.90280.91
262175.901.7790.9483.85271.50262.00281.01
263176.801.3989.9768.82271.60262.10281.10
264177.701.0089.0053.88271.70262.19281.20
265178.600.6188.0339.19271.79262.29281.30
266179.490.2287.0524.92271.89262.37281.40
267180.39-0.1786.0811.56271.98262.46281.51
268181.29-0.5685.106.38272.08262.55281.61
269182.19-0.9584.1317.63272.18262.63281.73
270183.09-1.3483.1530.28272.27262.71281.84
271183.99-1.7382.1842.85272.37262.78281.96
272184.89-2.1281.2055.27272.47262.86282.08
273185.79-2.5080.2267.52272.57262.93282.21
274186.69-2.8979.2579.63272.67263.00282.34
275187.60-3.2878.2791.61272.77263.06282.47
276188.50-3.6777.29103.50272.87263.13282.61
277189.41-4.0576.31115.31272.97263.19282.75
278190.32-4.4475.33127.07273.07263.25282.89
279191.23-4.8274.35138.80273.17263.31283.04
280192.14-5.2173.37150.52273.28263.36283.19
281193.05-5.5972.39162.15273.38263.42283.35
282193.97-5.9771.41172.79273.49263.47283.51
283194.88-6.3570.43171.02273.60263.52283.68
284195.80-6.7369.45159.43273.71263.56283.85
285196.72-7.1168.46146.73273.82263.61284.03
286197.64-7.4967.48133.46273.93263.65284.22
287198.57-7.8666.50119.67274.05263.69284.41
288199.50-8.2365.51105.39274.16263.72284.60
289200.43-8.6064.5390.69274.28263.76284.80
290201.36-8.9763.5475.66274.40263.79285.01
291202.29-9.3462.5560.48274.52263.82285.23
292203.23-9.7061.5745.32274.65263.84285.45
293204.17-10.0660.5830.39274.77263.87285.68
294205.11-10.4259.5916.04274.90263.89285.92
295206.05-10.7858.605.21275.04263.91286.17
296207.00-11.1357.6213.98275.17263.92286.42
297207.95-11.4956.6326.91275.31263.93286.68
298208.90-11.8355.6439.73275.45263.94286.96
299209.86-12.1854.6552.28275.59263.95287.24
300210.82-12.5253.6664.58275.74263.95287.54
301211.78-12.8652.6776.69275.90263.95287.84
302212.74-13.2051.6888.65276.05263.94288.16
303213.71-13.5350.69100.51276.21263.93288.49
304214.68-13.8649.70112.31276.38263.92288.83
305215.65-14.1848.71124.08276.55263.90289.19
306216.63-14.5047.72135.85276.72263.88289.57
307217.61-14.8246.72147.62276.91263.86289.95
Object in Sun Constraint



Science Operations Team Statistics
In the past 28 days, Swift has received 121 Target of Opportunity requests (4.3 per day), from 65 members of the community, for 102 different celestial objects. In that time Swift observed 83 targets in 113 separate observations on average per day. Swift was observing for 71% of the time, the rest of the time spent slewing or passing through the South Atlantic Anomaly.

Mullard Space Science Laboratory Southwest Research Institute Osservatorio Astronomico di Brera Penn State University University of Leicester Goddard Space Flight Center Max Planck Institute Agenzia Spaziale Italiana Sonoma State University Omitron Institution Menu