Datasets:

juliensimon
/

nvss-radio-catalog

recno int64	Field string	Xpos float64	Ypos float64	source_name string	ra_deg float64	dec_deg float64	ra_error_arcsec float64	dec_error_arcsec float64	flux_1400mhz_mjy float64	flux_error_mjy float64	l_MajAxis string	major_axis_arcsec float64	l_MinAxis string	minor_axis_arcsec float64	position_angle_deg float64	e_MajAxis float64	e_MinAxis float64	e_PA float64	f_resFlux string	residual_flux float64	polFlux float64	polPA float64	e_polFlux float64	e_polPA float64
221,942	C0256P00	261.71	522.6	030010+000224	45.042917	0.040028	0.73	8.8	2.7	0.5	<	104	<	69.5	null	null	null	null		null	-0.47	null	0.89	null
221,383	C0256P00	290.86	558.4	025941+001121	44.921417	0.189222	0.49	9.8	2.7	0.5	<	88.7	<	65.4	null	null	null	null		null	0.45	-69.6	0.73	24.6
222,370	C0256P00	242.2	562.09	030029+001216	45.124208	0.204583	0.46	10.6	2.7	0.5	<	100	<	55	null	null	null	null		null	0.67	0.4	0.7	16.2
222,272	C0256P00	246.51	565.76	030025+001311	45.106292	0.219861	0.83	9.2	2.6	0.5	<	122	<	59.1	null	null	null	null		null	0.76	-65.3	0.84	15.8
222,356	C0256P00	242.9	575.27	030029+001534	45.121333	0.2595	0.11	2	11.7	0.9		32.2	<	23.8	28.8	6.3	null	9.3		null	-0.17	null	0.6	null
222,551	C0256P00	233.56	598.04	030038+002115	45.16025	0.354389	0.11	1.6	9.5	0.5	<	28	<	25	null	null	null	null		null	-0.17	null	0.42	null
220,751	C0256P00	320.9	563.77	025911+001241	44.79625	0.211556	0.09	1.5	11.5	0.6	<	29.8	<	26.2	null	null	null	null		null	-0.1	null	0.49	null
221,506	C0256P00	284.83	581.39	025947+001706	44.946583	0.285	0.44	6.4	3.8	0.5	<	81.6	<	53.7	null	null	null	null		null	0.95	-60.4	0.83	12.5
221,417	C0256P00	289.14	587.59	025942+001838	44.928625	0.310806	0.2	4.1	7.7	1		46.7	<	31.5	-31.6	11	null	9.2		null	2.27	-62.9	0.78	5.1
221,357	C0256P00	292.18	591.69	025939+001940	44.915958	0.327917	0.31	5.5	4.9	0.5	<	68.3	<	57.8	null	null	null	null		null	0.93	81.2	0.92	13.4
221,180	C0256P00	300.82	591.77	025931+001941	44.879958	0.32825	0.15	2.5	6.4	0.5	<	33.4	<	30.6	null	null	null	null		null	0.36	-12.7	0.43	23.9
221,035	C0256P00	307.43	600.16	025924+002147	44.852417	0.363194	0.28	3.6	4.4	0.5	<	51.7	<	39.6	null	null	null	null		null	-0.17	null	0.47	null
222,169	C0256P00	251.53	604.86	030020+002258	45.085375	0.382778	0.18	2.7	5.7	0.4	<	35.2	<	32.7	null	null	null	null		null	0.37	67.7	0.42	23
223,049	C0256P00	209.08	606.81	030102+002327	45.262292	0.390917	0.1	1.7	10.5	0.5	<	31.6	<	23.6	null	null	null	null		null	0.94	-80.5	0.47	9.5
223,216	C0256P00	201.3	629.28	030110+002904	45.29475	0.484556	0.07	1.1	16	0.6	<	24.2	<	19.8	null	null	null	null		null	1.07	76	0.45	8.1
223,483	C0256P00	188.36	650.22	030123+003418	45.348667	0.571806	0.15	2.3	6.7	0.5	<	31.3	<	29.7	null	null	null	null		null	-0.04	null	0.42	null
224,726	C0256P00	128.85	647.75	030223+003341	45.596708	0.561472	0.06	0.9	20.1	0.7	<	22	<	18	null	null	null	null		null	-0.04	null	0.44	null
224,628	C0256P00	133.66	651.07	030218+003431	45.576708	0.575333	0.31	5	3.3	0.4	<	48.8	<	45.4	null	null	null	null		null	0.48	-25.7	0.42	17.6
222,778	C0256P00	222.26	632.2	030049+002948	45.207375	0.496694	0.26	4.1	3.9	0.4	<	43.8	<	40.9	null	null	null	null		null	-0.07	null	0.42	null
223,044	C0256P00	209.5	649.28	030102+003404	45.260542	0.567889	0.13	1.7	9.6	0.5	<	38.1	<	26	null	null	null	null		null	0.31	-12.7	0.53	30.6
223,237	C0256P00	200.32	651.86	030111+003443	45.298833	0.578611	0.06	1	17.3	0.7	<	22.6	<	18.9	null	null	null	null		null	0.72	84.5	0.44	12
222,270	C0256P00	246.57	643.07	030025+003231	45.106083	0.542	0.15	2.9	6.7	0.5	<	44.7	<	30.2	null	null	null	null		null	-0.2	null	0.52	null
223,757	C0256P00	174.83	686.24	030137+004318	45.405125	0.721861	0.33	3.5	5.7	0.5	<	69.6	<	43.1	null	null	null	null		null	-0.24	null	0.86	null
223,708	C0256P00	177.37	694.4	030134+004521	45.394542	0.755917	0.07	1.1	15	0.6	<	25.3	<	22.6	null	null	null	null		null	0.97	-88.2	0.47	9.2
223,513	C0256P00	186.61	696.95	030125+004559	45.356042	0.7665	0.17	3.2	14.3	1.3		61.6	<	41	32.2	7.5	null	6.6		null	2.15	-78.9	1.5	7.5
223,407	C0256P00	191.99	723.34	030120+005235	45.333667	0.876472	0.12	2.6	8.2	0.5	<	46.2	<	27.1	null	null	null	null		null	-0.09	null	0.57	null
221,238	C0256P00	298.29	652.72	025933+003455	44.8905	0.582194	0.65	8.6	2.5	0.5	<	98.8	<	58.7	null	null	null	null		null	0.52	47.1	0.65	20.1
221,106	C0256P00	304.14	659.26	025927+003634	44.866167	0.609472	0.22	3.5	4.6	0.4	<	39.6	<	37.2	null	null	null	null		null	-0.14	null	0.42	null
220,512	C0256P00	332.24	658.27	025859+003619	44.749042	0.605333	0.05	0.9	20.6	0.7	<	21.8	<	17.8	null	null	null	null		null	-0.05	null	0.44	null
219,293	C0256P00	391.38	649.33	025800+003405	44.502583	0.568056	0.05	0.9	20.6	0.7	<	18.2	<	17.7	null	null	null	null		null	0.41	40.6	0.42	20.8
218,919	C0256P00	408.56	678.47	025743+004122	44.431	0.6895	0.25	3.5	4.3	0.4	<	44.1	<	39.4	null	null	null	null		null	-0.19	null	0.42	null
220,427	C0256P00	335.43	702.96	025856+004729	44.735792	0.791528	0.62	14.2	3.2	0.6	<	148	<	51.6	null	null	null	null		null	-0.38	null	1.28	null
219,824	C0256P00	366.17	693.88	025825+004513	44.607667	0.753722	0.16	2.3	6.6	0.5	<	36.5	<	30.4	null	null	null	null		null	0.41	65.9	0.44	21.2
219,567	C0256P00	377.99	700.55	025814+004653	44.558417	0.781528	0.07	1.4	15.9	1		27.9	<	21.7	14.5	4.8	null	8.9		null	-0.21	null	0.58	null
221,752	C0256P00	272.28	666.52	025959+003822	44.998958	0.639694	0.54	7.6	2.3	0.4	<	73.5	<	60.7	null	null	null	null		null	0.55	34.5	0.45	16.1
222,177	C0256P00	250.94	691.56	030021+004438	45.087917	0.744056	0.25	4.1	4.1	0.4	<	47	<	39.9	null	null	null	null		null	-0.05	null	0.45	null
221,884	C0256P00	264.57	688.75	030007+004356	45.031083	0.732333	0.4	6.5	2.6	0.4	<	57.7	<	53.1	null	null	null	null		null	-0.08	null	0.42	null
221,496	C0256P00	285.3	686.23	025946+004318	44.944708	0.721861	0.53	7.9	2.3	0.4	<	73.6	<	60.9	null	null	null	null		null	-0.09	null	0.45	null
221,269	C0256P00	296.39	704.02	025935+004745	44.8985	0.796	0.04	0.7	31.2	1	<	23.3	<	17.5	null	null	null	null		null	1.44	52.4	0.48	6.3
221,738	C0256P00	273.03	699.06	025959+004631	44.995833	0.775306	0.23	3.1	6.1	0.5	<	54.8	<	36.5	null	null	null	null		null	-0.32	null	0.65	null
222,879	C0256P00	217.51	729.91	030054+005414	45.227292	0.903889	0.25	4.5	5.9	0.5	<	66.9	<	46.5	null	null	null	null		null	0.4	6.1	0.89	30.7
221,865	C0256P00	265.75	722.78	030006+005226	45.026208	0.874139	0.34	5	3.3	0.4	<	54.6	<	46.8	null	null	null	null		null	0.37	25.3	0.44	23.1
222,102	C0256P00	253.91	733.66	030018+005510	45.075542	0.9195	0.04	0.7	37.8	1.2	<	19.5	<	15.4	null	null	null	null		null	1.22	41	0.44	7.1
222,589	C0256P00	231.7	745.18	030040+005803	45.168167	0.9675	0.15	2.3	6.6	0.5	<	31.2	<	29.9	null	null	null	null		null	0.56	-47.1	0.42	15
222,781	C0256P00	222.09	752.67	030049+005955	45.20825	0.998694	0.03	0.6	74.9	2.3	<	17	<	16.3	null	null	null	null	P*	21	-0.11	null	0.44	null
220,765	C0256P00	320.13	700.28	025911+004649	44.799583	0.780389	0.42	6.2	3.8	0.5	<	84.8	<	44.2	null	null	null	null		null	0.3	-41.5	0.73	37.2
220,529	C0256P00	331.38	710.42	025900+004921	44.752708	0.822639	0.03	0.6	337.4	11.6		24.9	<	17.8	-61.7	1.9	null	0.6	P*	45	14.96	-78.9	0.58	0.7
221,520	C0256P00	284.36	720.21	025947+005148	44.948625	0.863472	0.27	5.9	4.8	0.5	<	76.3	<	43	null	null	null	null		null	-0.14	null	0.82	null
221,371	C0256P00	291.56	736.13	025940+005547	44.918667	0.929778	0.13	1.9	7.9	0.5	<	30.3	<	27.2	null	null	null	null		null	1.01	20.6	0.42	8.4
220,540	C0256P00	330.99	728.17	025901+005347	44.754292	0.896611	0.05	0.9	24.3	0.8	<	25	<	20	null	null	null	null		null	1.15	-39.1	0.5	8
220,351	C0256P00	338.95	737.59	025853+005609	44.721167	0.935861	0.06	1	18.5	0.7	<	28	<	18.6	null	null	null	null		null	-0.33	null	0.48	null
220,386	C0256P00	337.48	743.91	025854+005743	44.727292	0.962194	0.19	3.2	5.2	0.5	<	39.8	<	34.6	null	null	null	null		null	-0.19	null	0.44	null
220,971	C0256P00	310.32	732.07	025921+005446	44.840458	0.912833	0.58	8.9	2.2	0.5	<	85.2	<	61.6	null	null	null	null		null	1.14	89.6	0.52	8.3
221,827	C0256P00	267.56	742.9	030004+005728	45.018708	0.957972	0.57	10.2	2.9	0.5	<	93	<	77.4	null	null	null	null	S*	27	0.79	50.3	0.93	16
222,330	C0256P00	243.97	761.62	030028+010209	45.117042	1.036	0.13	2.1	7.4	0.5	<	29.3	<	28.1	null	null	null	null		null	0.53	77.6	0.42	16
225,433	C0256P00	95.15	664.93	030256+003759	45.73725	0.633083	0.48	12.1	2.6	0.5	<	108	<	57.1	null	null	null	null		null	-0.1	null	0.74	null
224,997	C0256P00	115.11	671.4	030236+003936	45.654042	0.660028	0.04	0.7	32.4	1.1	<	18.5	<	15.8	null	null	null	null		null	0.32	22.5	0.43	27.2
225,965	C0256P00	70.64	694.96	030321+004529	45.839458	0.758194	0.04	0.8	27.6	0.9	<	18.2	<	16.6	null	null	null	null		null	0.19	-18.6	0.43	45.8
226,107	C0256P00	63.82	749.96	030328+005914	45.868	0.987444	0.09	1.4	15.9	1		25.9	<	31.1	27.7	4.9	null	27.3		null	-0.16	null	0.65	null
224,634	C0256P00	133.43	717.24	030218+005103	45.57775	0.851056	0.72	9.8	2.9	0.5	<	121	<	54.7	null	null	null	null		null	0.37	82.5	0.91	33.8
224,737	C0256P00	128.35	748.4	030223+005851	45.598958	0.980944	0.37	8.8	2.9	0.5	<	83.4	<	51.1	null	null	null	null		null	0.39	-8.2	0.62	26.5
224,350	C0256P00	147.23	745.24	030204+005803	45.52025	0.967722	0.04	0.7	38.7	1.2	<	21.8	<	20.4	null	null	null	null		null	2.16	-20.9	0.5	4.3
225,734	C0256P00	81.47	766.67	030310+010325	45.794458	1.057056	0.1	1.6	10.1	0.5	<	28	<	24	null	null	null	null		null	0.23	56.2	0.44	37.9
227,327	C0312P00	965.96	764.12	030425+010247	46.107833	1.046444	0.48	6	2.6	0.4	<	68.8	<	54.7	null	null	null	null		null	-0.1	null	0.45	null
226,759	C0312P00	993.76	750.89	030358+005928	45.991917	0.991278	0.03	0.6	116.7	3.5	<	17.1	<	15	null	null	null	null		null	0.03	14.5	0.43	90
226,921	C0312P00	985.62	761.51	030406+010207	46.025875	1.035528	0.13	2.2	7.2	0.5	<	31.5	<	28.2	null	null	null	null		null	0.77	46.3	0.42	10.8
226,304	C0256P00	54.9	763	030337+010230	45.90525	1.04175	0.56	8.6	2.4	0.5	<	79.5	<	64.4	null	null	null	null		null	0.22	30.5	0.56	44.5
228,124	C0312P00	927.23	802.6	030504+011224	46.26925	1.206778	0.05	0.9	22.5	0.8	<	22.5	<	17.2	null	null	null	null		null	-0.07	null	0.44	null
227,534	C0312P00	956.05	787.38	030435+010836	46.149083	1.143361	0.2	3.1	4.9	0.4	<	37.9	<	35.3	null	null	null	null		null	0.42	9.5	0.41	19.5
227,533	C0312P00	956.12	794.04	030435+011016	46.148792	1.171111	0.58	6.6	3	0.5	<	90.5	<	53.4	null	null	null	null		null	0.69	41.4	0.68	15.4
225,879	C0256P00	74.65	787.86	030317+010843	45.822958	1.145361	0.07	1.3	14	0.6	<	27.4	<	20.7	null	null	null	null		null	-0.12	null	0.46	null
226,494	C0256P00	45.69	796.18	030346+011048	45.94375	1.180028	0.29	4.7	3.5	0.4	<	47.2	<	44.1	null	null	null	null		null	-0.14	null	0.42	null
226,554	C0256P00	42.78	801.23	030349+011203	45.955917	1.201056	0.17	3	6.1	0.5	<	43.1	<	31.7	null	null	null	null		null	-0.25	null	0.49	null
227,074	C0312P00	978.13	818.74	030413+011626	46.056917	1.274083	0.06	1.1	18.9	1		22.7	<	20.4	-16.9	4.3	null	10.5		null	0.15	-64.7	0.52	63.5
226,628	C0312P00	999.46	835.22	030352+012033	45.967917	1.342722	0.3	4.6	3.4	0.4	<	48.9	<	44.9	null	null	null	null		null	-0.08	null	0.41	null
226,885	C0312P00	987.21	840.92	030404+012159	46.018958	1.3665	0.08	1.6	14	1		29.1	<	25.1	-14.5	5.3	null	10.7		null	1.5	27.8	0.59	6.6
222,806	C0256P00	221.17	762.37	030050+010220	45.212083	1.039111	0.07	1.2	14.5	0.6	<	25.8	<	23.4	null	null	null	null		null	0.83	51.3	0.47	10.9
223,455	C0256P00	189.79	780.4	030122+010651	45.342917	1.114278	0.5	8.1	2.2	0.4	<	67	<	61	null	null	null	null		null	0.5	16.1	0.42	16.8
223,400	C0256P00	192.48	787.05	030119+010831	45.331708	1.142	0.18	3.1	5.7	0.5	<	42.7	<	32.9	null	null	null	null		null	0.78	52.9	0.48	11.5
224,729	C0256P00	128.81	810.3	030223+011419	45.597208	1.238861	0.31	5.9	4.2	0.5	<	76.1	<	41	null	null	null	null		null	0.18	-52.7	0.69	59.8
224,142	C0256P00	156.69	797.49	030155+011107	45.480917	1.1855	0.13	2.1	8	0.5	<	34.3	<	29.3	null	null	null	null		null	-0.15	null	0.48	null
222,530	C0256P00	234.47	771.69	030037+010440	45.156667	1.077972	0.34	6.7	3.9	0.5	<	75.5	<	52	null	null	null	null		null	0.85	-45.4	0.76	13.4
223,137	C0256P00	205.03	811.23	030107+011433	45.279458	1.24275	0.45	7.4	2.3	0.4	<	63	<	57.7	null	null	null	null		null	-0.25	null	0.42	null
223,805	C0256P00	171.82	816.22	030140+011548	45.417875	1.263556	0.45	4.6	3.5	0.5	<	73.7	<	46.5	null	null	null	null		null	0.51	9.1	0.59	19.7
223,481	C0256P00	188.51	827.33	030123+011835	45.348375	1.309861	0.03	0.6	531.6	16	<	17.4	<	16	null	null	null	null		null	5.82	65.6	0.45	1.5
223,774	C0256P00	173.95	831.62	030138+011939	45.409042	1.32775	0.07	0.9	26	1.2		36.9	<	17.6	-75.9	3	null	3.8	P*	34	0.24	-48.4	0.68	45.4
223,691	C0256P00	178.1	832.32	030134+011950	45.39175	1.330667	0.33	5.7	3.2	0.4	<	55.3	<	47.3	null	null	null	null	P*	22	0.68	-50.3	0.44	12.8
224,919	C0256P00	118.57	838.19	030233+012118	45.639958	1.355111	0.93	14.1	3.1	0.6	<	170	<	53.3	null	null	null	null	P*	21	0.51	-69.1	1.53	31.5
226,715	C0256P00	35.9	862.3	030356+012720	45.984792	1.455583	0.27	4.4	3.7	0.4	<	45	<	42.2	null	null	null	null		null	0.48	-74.9	0.42	17.7
226,835	C0312P00	989.52	874.11	030402+013017	46.00925	1.504806	0.44	6.1	2.5	0.4	<	62.3	<	55.9	null	null	null	null		null	-0.09	null	0.41	null
226,600	C0256P00	41.09	876.84	030351+013058	45.963167	1.516222	0.77	6.6	2.7	0.5	<	107	<	56.8	null	null	null	null		null	-0.21	null	0.74	null
225,877	C0256P00	74.88	860.24	030317+012649	45.822208	1.447	0.21	3.3	4.8	0.4	<	37.9	<	35.9	null	null	null	null	P*	22	-0.14	null	0.42	null
226,321	C0256P00	54.24	886.25	030338+013319	45.908375	1.555444	0.47	14.1	2.6	0.5	<	123	<	56.9	null	null	null	null		null	0.04	21.8	0.88	90
226,318	C0256P00	54.35	897.91	030337+013614	45.907958	1.604028	0.06	0.9	24	1.1		21.9	<	24.2	-16.5	3.7	null	16.7		null	0.53	57.2	0.57	18.7
225,092	C0256P00	110.83	865.26	030241+012804	45.672292	1.467972	0.04	0.7	28.5	0.9	<	20.3	<	16.3	null	null	null	null		null	0.68	-11.3	0.43	12.6
224,991	C0256P00	115.45	900.48	030236+013653	45.653167	1.61475	0.45	8.5	2.4	0.5	<	74.4	<	57.1	null	null	null	null		null	0.87	67.3	0.49	10.5
225,344	C0256P00	100.03	927.52	030252+014338	45.717583	1.727472	0.22	3.4	4.6	0.4	<	39.4	<	37	null	null	null	null		null	0.37	82.5	0.42	23
225,089	C0256P00	110.97	930.42	030241+014422	45.671958	1.739556	0.06	0.9	31.3	1.6		32.5		19.9	-78.7	2.8	3.6	8		null	1.18	5.4	0.75	9.6
218,278	C0256P00	440.83	658.69	025711+003625	44.296583	0.607056	0.4	14.5	3.2	0.6	<	138	<	50.3	null	null	null	null		null	0.89	74.7	1.19	15.9
218,322	C0256P00	438.66	693.26	025713+004504	44.305625	0.751111	0.48	7.6	2.3	0.4	<	65.5	<	59.5	null	null	null	null		null	-0.02	null	0.42	null

End of preview. Expand in Data Studio

NVSS Radio Source Catalog

The NRAO VLA Sky Survey (NVSS) -- THE foundational 1.4 GHz radio survey covering 82% of the celestial sky (declination > -40 deg) with 1,773,484 discrete radio sources. This is the most widely used radio continuum survey in astronomy.

Dataset description

The NVSS used the VLA in its compact D and DnC configurations to survey the sky north of declination -40 degrees at 1.4 GHz with ~45" resolution and a completeness limit of about 2.5 mJy. The resulting catalog is the primary reference for radio source populations and is widely used for cross-matching with optical, infrared, and X-ray catalogs.

Schema

Column	Type	Description
`source_name`	string	NVSS source name (HHMMSS+DDMMSS format)
`ra_deg`	float64	Right ascension J2000 (degrees)
`dec_deg`	float64	Declination J2000 (degrees)
`flux_1400mhz_mjy`	float64	Integrated flux density at 1.4 GHz (mJy)
`flux_error_mjy`	float64	Flux density uncertainty (mJy)
`major_axis_arcsec`	float64	Fitted major axis FWHM (arcsec)
`minor_axis_arcsec`	float64	Fitted minor axis FWHM (arcsec)
`position_angle_deg`	float64	Fitted position angle (degrees)
`ra_error_arcsec`	float64	RA position uncertainty (arcsec)
`dec_error_arcsec`	float64	Dec position uncertainty (arcsec)
`residual_code`	string	Residual code from Gaussian fitting

Quick stats

1,773,484 radio sources
Median flux density: 5.60 mJy
Declination range: -40.4 to 89.8 degrees
Sky coverage: ~82% of the celestial sphere (dec > -40 deg)

Usage

from datasets import load_dataset

ds = load_dataset("juliensimon/nvss-radio-catalog", split="train")
df = ds.to_pandas()

# Flux distribution
import matplotlib.pyplot as plt
df["flux_1400mhz_mjy"].clip(upper=1000).hist(bins=200, log=True)
plt.xlabel("Flux density at 1.4 GHz (mJy)")
plt.ylabel("Count")
plt.title("NVSS Source Flux Distribution")
plt.show()

# Sky density map
plt.hexbin(df["ra_deg"], df["dec_deg"], gridsize=100, mincnt=1)
plt.colorbar(label="Source count")
plt.xlabel("RA (deg)")
plt.ylabel("Dec (deg)")
plt.title("NVSS Sky Density")
plt.show()

# Bright sources (> 1 Jy)
bright = df[df["flux_1400mhz_mjy"] > 1000]
print(f"Sources > 1 Jy: {len(bright):,}")

Data source

Condon, J.J., Cotton, W.D., Greisen, E.W., Yin, Q.F., Perley, R.A., Taylor, G.B., and Broderick, J.J. (1998), The NRAO VLA Sky Survey. Astronomical Journal, 115, 1693. Via VizieR CDS (VIII/65).

Pipeline

Source code: juliensimon/space-datasets

Citation

@dataset{nvss_radio_catalog,
  author = {Simon, Julien},
  title = {NVSS Radio Source Catalog},
  year = {2026},
  publisher = {Hugging Face},
  url = {https://huggingface.co/datasets/juliensimon/nvss-radio-catalog},
  note = {Based on Condon et al. (1998) via VizieR CDS}
}