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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
32	314.80	-17.10	46.12	93.68	86.18	72.99	99.36
33	315.82	-16.81	47.12	79.64	86.36	73.40	99.33
34	316.83	-16.52	48.13	65.56	86.54	73.79	99.30
35	317.84	-16.22	49.13	51.48	86.72	74.16	99.28
36	318.85	-15.92	50.14	37.45	86.89	74.52	99.27
37	319.85	-15.62	51.14	23.56	87.06	74.86	99.26
38	320.85	-15.31	52.15	10.27	87.22	75.19	99.25
39	321.85	-14.99	53.16	6.89	87.38	75.50	99.25
40	322.85	-14.67	54.16	19.32	87.53	75.81	99.25
41	323.84	-14.35	55.17	32.71	87.68	76.10	99.25
42	324.83	-14.02	56.17	46.06	87.82	76.39	99.26
43	325.81	-13.69	57.18	59.22	87.96	76.66	99.27
44	326.79	-13.36	58.18	72.13	88.10	76.92	99.28
45	327.77	-13.02	59.19	84.77	88.24	77.18	99.30
46	328.75	-12.68	60.19	97.15	88.37	77.42	99.32
47	329.72	-12.33	61.19	109.29	88.50	77.66	99.34
48	330.69	-11.98	62.20	121.24	88.63	77.89	99.37
49	331.66	-11.63	63.20	133.05	88.75	78.11	99.40
50	332.62	-11.28	64.20	144.79	88.88	78.32	99.43
51	333.58	-10.92	65.21	156.48	89.00	78.53	99.46
52	334.54	-10.56	66.21	167.97	89.11	78.73	99.50
53	335.49	-10.19	67.21	175.14	89.23	78.93	99.54
54	336.45	-9.83	68.21	165.62	89.35	79.12	99.58
55	337.40	-9.46	69.21	153.20	89.46	79.30	99.62
56	338.34	-9.09	70.21	140.15	89.57	79.48	99.67
57	339.29	-8.72	71.21	126.65	89.68	79.65	99.72
58	340.23	-8.34	72.21	112.76	89.79	79.81	99.77
59	341.17	-7.96	73.21	98.56	89.90	79.98	99.82
60	342.11	-7.59	74.21	84.16	90.01	80.13	99.88
61	343.05	-7.20	75.21	69.64	90.11	80.29	99.94
62	343.98	-6.82	76.21	55.14	90.22	80.43	100.00
63	344.91	-6.44	77.20	40.76	90.32	80.58	100.06
64	345.84	-6.05	78.20	26.60	90.42	80.72	100.13
65	346.77	-5.67	79.20	12.96	90.52	80.85	100.19
66	347.70	-5.28	80.19	4.95	90.62	80.98	100.27
67	348.62	-4.89	81.19	16.10	90.72	81.11	100.34
68	349.55	-4.50	82.18	29.23	90.82	81.24	100.41
69	350.47	-4.11	83.18	42.35	90.92	81.36	100.49
70	351.39	-3.71	84.17	55.33	91.02	81.47	100.57
71	352.31	-3.32	85.17	68.13	91.12	81.59	100.66
72	353.23	-2.93	86.16	80.74	91.22	81.70	100.74
73	354.15	-2.53	87.15	93.15	91.32	81.81	100.83
74	355.06	-2.14	88.15	105.37	91.42	81.91	100.92
75	355.98	-1.74	89.14	117.41	91.51	82.01	101.01
76	356.89	-1.35	90.13	129.31	91.61	82.11	101.11
77	357.81	-0.95	91.12	141.09	91.71	82.21	101.21
78	358.72	-0.55	92.11	152.79	91.81	82.30	101.31
79	359.63	-0.16	93.10	164.35	91.90	82.39	101.42
80	0.55	0.24	94.09	174.59	92.00	82.48	101.52
81	1.46	0.63	95.08	169.88	92.10	82.56	101.64
82	2.37	1.03	96.06	158.05	92.20	82.64	101.75
83	3.28	1.42	97.05	145.46	92.29	82.72	101.87
84	4.19	1.81	98.04	132.35	92.39	82.80	101.99
85	5.10	2.21	99.02	118.76	92.49	82.87	102.11
86	6.01	2.60	100.01	104.72	92.59	82.94	102.24
87	6.92	2.99	100.99	90.27	92.69	83.01	102.37
88	7.83	3.38	101.98	75.52	92.79	83.08	102.50
89	8.74	3.77	102.96	60.61	92.89	83.14	102.64
90	9.65	4.16	103.94	45.69	93.00	83.21	102.78
91	10.56	4.54	104.92	30.92	93.10	83.27	102.93
92	11.47	4.93	105.91	16.57	93.20	83.32	103.08
93	12.38	5.31	106.89	4.67	93.31	83.38	103.23
94	13.29	5.69	107.87	13.03	93.41	83.43	103.39
95	14.21	6.07	108.85	26.25	93.52	83.48	103.56
96	15.12	6.45	109.83	39.41	93.63	83.53	103.73
97	16.04	6.83	110.81	52.33	93.74	83.57	103.90
98	16.95	7.20	111.78	65.04	93.85	83.62	104.08
99	17.87	7.58	112.76	77.54	93.96	83.66	104.26
100	18.79	7.95	113.74	89.87	94.07	83.70	104.45
101	19.71	8.32	114.71	102.03	94.19	83.73	104.65
102	20.63	8.68	115.69	114.06	94.31	83.76	104.85
103	21.55	9.05	116.67	125.97	94.43	83.80	105.06
104	22.47	9.41	117.64	137.79	94.55	83.82	105.27
105	23.40	9.77	118.61	149.52	94.67	83.85	105.49
106	24.32	10.12	119.59	161.15	94.80	83.87	105.72
107	25.25	10.48	120.56	172.22	94.92	83.89	105.96
108	26.18	10.83	121.53	173.10	95.05	83.91	106.20
109	27.11	11.18	122.50	161.93	95.19	83.92	106.45
110	28.04	11.52	123.47	149.78	95.32	83.93	106.71
111	28.98	11.86	124.44	137.18	95.46	83.94	106.98
112	29.91	12.20	125.41	124.15	95.60	83.95	107.26
113	30.85	12.53	126.38	110.64	95.75	83.95	107.55
114	31.79	12.86	127.34	96.65	95.90	83.95	107.85
115	32.73	13.19	128.31	82.20	96.05	83.94	108.16
116	33.68	13.52	129.28	67.37	96.21	83.93	108.48
117	34.62	13.84	130.24	52.29	96.37	83.92	108.81
118	35.57	14.15	131.21	37.13	96.53	83.91	109.16
119	36.52	14.47	132.17	22.13	96.70	83.89	109.52
120	37.47	14.77	133.13	7.98	96.88	83.86	109.90
121	38.42	15.08	134.09	8.86	97.06	83.83	110.29
122	39.38	15.38	135.05	22.37	97.25	83.80	110.69
123	40.34	15.67	136.01	35.95	97.44	83.76	111.12
124	41.30	15.97	136.97	49.18	97.64	83.72	111.56
125	42.26	16.25	137.93	62.06	97.85	83.67	112.03
126	43.23	16.54	138.89	74.64	98.06	83.61	112.51
127	44.20	16.82	139.85	86.97	98.29	83.55	113.02
128	45.17	17.09	140.81	99.11	98.52	83.49	113.55
129	46.14	17.36	141.76	111.10	98.76	83.41	114.11
130	47.12	17.62	142.72	122.99	99.01	83.33	114.69
131	48.09	17.88	143.67	134.79	99.28	83.24	115.31
132	49.07	18.14	144.62	146.54	99.55	83.14	115.96
133	50.06	18.38	145.57	158.21	99.84	83.04	116.64
134	51.04	18.63	146.52	169.60	100.14	82.92	117.37
135	52.03	18.87	147.47	175.20	100.46	82.79	118.13
136	53.02	19.10	148.42	164.99	100.80	82.65	118.94
137	54.01	19.33	149.37	153.06	101.15	82.50	119.79
138	55.01	19.55	150.31	140.76	101.52	82.34	120.70
139	56.00	19.77	151.26	128.14	101.92	82.16	121.67
140	57.00	19.98	152.20	115.17	102.34	81.97	122.71
141	58.00	20.19	153.14	101.78	102.78	81.76	123.81
142	59.00	20.39	154.08	87.95	103.26	81.53	124.99
143	60.01	20.58	155.01	73.68	103.77	81.28	126.26
144	61.02	20.77	155.95	59.01	104.31	81.01	127.62
145	62.03	20.95	156.88	44.04	104.90	80.71	129.09
146	63.04	21.13	157.81	28.94	105.53	80.38	130.69
147	64.05	21.30	158.73	14.04	106.22	80.03	132.41
148	65.07	21.46	159.66	4.46	106.96	79.64	134.29
149	66.08	21.62	160.57	16.93	107.77	79.21	136.34
150	67.10	21.77	161.49	31.05	108.66	78.74	138.58
151	68.12	21.91	162.40	44.85	109.64	78.22	141.05
152	69.14	22.05	163.30	58.22	110.72	77.65	143.78
153	70.17	22.19	164.20	71.17	111.92	77.02	146.81
154	71.20	22.31	165.09	83.76	113.25	76.33	150.18
155	72.22	22.43	165.97	96.04	114.75	75.56	153.95
156	73.25	22.54	166.84	108.11	116.45	74.72	158.19
157	74.28	22.65	167.70	120.01	118.38	73.79	162.98
158	75.31	22.75	168.54	131.82	120.59	72.77	168.42
159	76.35	22.84	169.37	143.57	123.15	71.67	174.63
160	77.38	22.93	170.16	155.27	126.12	70.51	181.73
161	78.42	23.01	170.93	166.82	129.59	69.32	189.87
162	79.45	23.08	171.66	175.80	133.69	68.18	199.19
163	80.49	23.15	172.34	167.77	138.53	67.26	209.80
164	81.53	23.21	172.96	155.94	144.26	66.80	221.72
165	82.57	23.26	173.49	143.69	150.99	67.23	234.75
166	83.61	23.31	173.92	131.19	158.79	69.15	248.42
167	84.65	23.35	174.22	118.44	167.57	73.28	261.85
168	85.69	23.38	174.37	105.40	177.06	80.21	273.91
169	86.73	23.40	174.37	92.05	186.80	90.04	283.56
170	87.77	23.42	174.20	78.35	196.25	102.23	290.28
171	88.81	23.43	173.89	64.28	204.96	115.70	294.23
172	89.85	23.44	173.46	49.88	212.68	129.33	296.03
173	90.89	23.43	172.92	35.22	219.33	142.27	296.39
174	91.92	23.43	172.30	20.46	224.99	154.08	295.89
175	92.96	23.41	171.62	6.51	229.77	164.58	294.95
176	94.00	23.39	170.89	10.76	233.81	173.81	293.81
177	95.04	23.36	170.12	24.99	237.24	181.86	292.63
178	96.08	23.32	169.33	39.24	240.18	188.89	291.47
179	97.12	23.28	168.51	53.14	242.71	195.03	290.38
180	98.15	23.23	167.67	66.61	244.90	200.42	289.37
181	99.19	23.17	166.81	79.64	246.81	205.17	288.45
182	100.22	23.10	165.94	92.29	248.49	209.38	287.61
183	101.25	23.03	165.07	104.60	249.98	213.12	286.85
184	102.29	22.96	164.18	116.67	251.31	216.46	286.16
185	103.32	22.87	163.29	128.55	252.50	219.46	285.53
186	104.35	22.78	162.39	140.34	253.57	222.17	284.97
187	105.38	22.68	161.48	152.07	254.54	224.63	284.45
188	106.40	22.58	160.57	163.70	255.42	226.86	283.98
189	107.43	22.47	159.66	174.37	256.23	228.90	283.56
190	108.45	22.35	158.74	170.73	256.97	230.77	283.17
191	109.48	22.23	157.82	159.05	257.65	232.48	282.82
192	110.50	22.10	156.90	146.76	258.28	234.07	282.49
193	111.51	21.96	155.97	134.20	258.86	235.53	282.20
194	112.53	21.82	155.05	121.40	259.41	236.89	281.93
195	113.55	21.67	154.12	108.37	259.91	238.15	281.68
196	114.56	21.52	153.19	95.13	260.39	239.33	281.45
197	115.57	21.36	152.26	81.65	260.83	240.42	281.24
198	116.58	21.19	151.32	67.94	261.25	241.45	281.05
199	117.58	21.02	150.39	53.99	261.64	242.42	280.87
200	118.59	20.84	149.45	39.83	262.01	243.32	280.71
201	119.59	20.66	148.52	25.53	262.37	244.18	280.56
202	120.59	20.47	147.58	11.39	262.70	244.98	280.42
203	121.58	20.27	146.64	5.75	263.02	245.74	280.29
204	122.58	20.07	145.70	19.06	263.32	246.46	280.17
205	123.57	19.86	144.76	33.30	263.60	247.14	280.07
206	124.56	19.65	143.82	47.41	263.88	247.79	279.97
207	125.54	19.43	142.88	61.22	264.14	248.40	279.88
208	126.53	19.21	141.93	74.66	264.39	248.98	279.80
209	127.51	18.98	140.99	87.71	264.63	249.54	279.72
210	128.49	18.74	140.05	100.38	264.86	250.07	279.66
211	129.46	18.50	139.10	112.73	265.08	250.58	279.59
212	130.44	18.26	138.15	124.82	265.30	251.06	279.54
213	131.41	18.01	137.21	136.72	265.51	251.52	279.49
214	132.38	17.76	136.26	148.50	265.70	251.96	279.45
215	133.35	17.50	135.31	160.18	265.90	252.39	279.41
216	134.31	17.23	134.37	171.48	266.08	252.79	279.37
217	135.27	16.97	133.42	173.91	266.26	253.18	279.34
218	136.23	16.69	132.47	162.74	266.44	253.56	279.32
219	137.19	16.42	131.52	150.49	266.61	253.92	279.30
220	138.14	16.13	130.57	137.87	266.77	254.27	279.28
221	139.09	15.85	129.62	124.96	266.93	254.60	279.27
222	140.04	15.56	128.66	111.78	267.09	254.92	279.26
223	140.99	15.26	127.71	98.37	267.24	255.23	279.25
224	141.94	14.96	126.76	84.77	267.39	255.53	279.25
225	142.88	14.66	125.81	71.00	267.53	255.82	279.25
226	143.82	14.35	124.85	57.10	267.67	256.10	279.25
227	144.76	14.04	123.90	43.11	267.81	256.37	279.26
228	145.69	13.73	122.94	29.06	267.95	256.63	279.27
229	146.63	13.41	121.99	15.12	268.08	256.88	279.28
230	147.56	13.09	121.03	3.98	268.21	257.12	279.30
231	148.49	12.77	120.08	14.42	268.34	257.36	279.31
232	149.41	12.44	119.12	28.30	268.46	257.58	279.33
233	150.34	12.11	118.17	42.23	268.58	257.81	279.36
234	151.26	11.77	117.21	56.01	268.70	258.02	279.38
235	152.18	11.44	116.25	69.55	268.82	258.23	279.41
236	153.10	11.10	115.30	82.79	268.94	258.43	279.44
237	154.02	10.75	114.34	95.73	269.05	258.62	279.48
238	154.93	10.41	113.38	108.34	269.16	258.81	279.51
239	155.85	10.06	112.42	120.67	269.27	259.00	279.55
240	156.76	9.71	111.46	132.76	269.38	259.18	279.59
241	157.67	9.35	110.50	144.65	269.49	259.35	279.63
242	158.58	9.00	109.54	156.40	269.60	259.52	279.68
243	159.49	8.64	108.58	167.94	269.71	259.68	279.73
244	160.40	8.28	107.61	176.13	269.81	259.84	279.78
245	161.30	7.91	106.65	166.86	269.91	260.00	279.83
246	162.21	7.55	105.69	154.84	270.02	260.15	279.88
247	163.11	7.18	104.72	142.35	270.12	260.30	279.94
248	164.01	6.81	103.76	129.49	270.22	260.44	280.00
249	164.92	6.44	102.79	116.27	270.32	260.58	280.06
250	165.82	6.06	101.83	102.73	270.42	260.71	280.12
251	166.72	5.69	100.86	88.90	270.52	260.84	280.19
252	167.62	5.31	99.90	74.85	270.62	260.97	280.26
253	168.51	4.93	98.93	60.66	270.71	261.10	280.33
254	169.41	4.55	97.96	46.41	270.81	261.22	280.40
255	170.31	4.17	96.99	32.18	270.91	261.34	280.48
256	171.21	3.79	96.02	18.11	271.00	261.45	280.56
257	172.10	3.41	95.06	5.16	271.10	261.56	280.64
258	173.00	3.02	94.09	11.10	271.20	261.67	280.72
259	173.90	2.64	93.12	24.64	271.29	261.78	280.81
260	174.79	2.25	92.15	38.30	271.39	261.88	280.89
261	175.69	1.87	91.18	51.84	271.48	261.98	280.98
262	176.59	1.48	90.20	65.21	271.58	262.08	281.08
263	177.48	1.09	89.23	78.38	271.67	262.17	281.17
264	178.38	0.70	88.26	91.33	271.77	262.26	281.27
265	179.28	0.31	87.29	104.03	271.86	262.35	281.37
266	180.17	-0.07	86.31	116.49	271.96	262.44	281.48
267	181.07	-0.46	85.34	128.72	272.06	262.52	281.59
268	181.97	-0.85	84.37	140.74	272.15	262.61	281.70
269	182.87	-1.24	83.39	152.60	272.25	262.69	281.81
270	183.77	-1.63	82.42	164.26	272.35	262.76	281.93
271	184.67	-2.02	81.44	174.99	272.44	262.84	282.05
272	185.57	-2.41	80.46	170.86	272.54	262.91	282.18
273	186.47	-2.80	79.49	159.23	272.64	262.98	282.30
274	187.38	-3.19	78.51	147.05	272.74	263.05	282.44
275	188.28	-3.57	77.53	134.50	272.84	263.11	282.57
276	189.19	-3.96	76.55	121.56	272.94	263.18	282.71
277	190.10	-4.35	75.57	108.19	273.05	263.24	282.86
278	191.01	-4.73	74.59	94.40	273.15	263.30	283.00
279	191.92	-5.12	73.61	80.25	273.25	263.35	283.16
280	192.83	-5.50	72.63	65.80	273.36	263.40	283.31
281	193.75	-5.88	71.65	51.16	273.47	263.46	283.47
282	194.66	-6.26	70.66	36.47	273.57	263.51	283.64
283	195.58	-6.64	69.68	21.90	273.68	263.55	283.81
284	196.50	-7.02	68.70	7.90	273.79	263.60	283.99
285	197.42	-7.40	67.71	8.03	273.91	263.64	284.17
286	198.35	-7.77	66.73	21.56	274.02	263.68	284.36
287	199.27	-8.14	65.75	35.21	274.13	263.71	284.55
288	200.20	-8.51	64.76	48.67	274.25	263.75	284.75
289	201.13	-8.88	63.78	61.90	274.37	263.78	284.96
290	202.07	-9.25	62.79	74.91	274.49	263.81	285.18
291	203.00	-9.61	61.80	87.72	274.62	263.84	285.40
292	203.94	-9.98	60.82	100.33	274.74	263.86	285.62
293	204.88	-10.34	59.83	112.76	274.87	263.88	285.86
294	205.82	-10.69	58.84	125.00	275.00	263.90	286.10
295	206.77	-11.05	57.86	137.08	275.14	263.92	286.36
296	207.72	-11.40	56.87	149.00	275.27	263.93	286.62
297	208.67	-11.75	55.88	160.76	275.41	263.94	286.89
298	209.62	-12.09	54.89	172.11	275.56	263.95	287.17
299	210.58	-12.44	53.90	174.19	275.71	263.95	287.46
300	211.54	-12.78	52.91	163.06	275.86	263.95	287.77
301	212.51	-13.11	51.92	151.19	276.01	263.94	288.08
302	213.47	-13.45	50.93	139.02	276.17	263.94	288.41
303	214.44	-13.78	49.94	126.53	276.34	263.92	288.75
304	215.42	-14.10	48.95	113.64	276.51	263.91	289.10
305	216.39	-14.42	47.96	100.31	276.68	263.89	289.47
306	217.37	-14.74	46.96	86.51	276.86	263.86	289.86
Object in Sun Constraint

Swift Mission Operations Center

The Pennsylvania State University
301 Science Park Road Suite 332,
State College, PA 16801
USA
☎ +1 (814) 865-6834
📧 swiftods@swift.psu.edu

Swift MOC Team Leads

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

Swift Partners

UK: UCL MSSL Univ. of Leicester
USA: NASA/GSFC LANL Omitron SwRI
Italy: SSDC/ASI INAF OA-Brera

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Swift Mission Operations Center

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