Summary of differences in arcseconds

Green means < 10 milli-arcsec, orange < 1 arcsec and red > 1 arcsec

See also matrix view

ecliptic to fk4

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	ecliptic	fk4	12.176896	10.983135	13.951006	3.072234	Plot
astropy	palpy	ecliptic	fk4	12.128428	10.935371	13.888976	3.057482	Plot
astropy	pyast	ecliptic	fk4	12.188700	10.989591	13.957816	3.072625	Plot
astropy	pyephem	ecliptic	fk4	11.674292	10.582021	13.791029	2.971487	Plot
casa	palpy	ecliptic	fk4	0.062985	0.057499	0.074090	0.016668	Plot
casa	pyast	ecliptic	fk4	0.036182	0.032938	0.041569	0.008883	Plot
casa	pyephem	ecliptic	fk4	0.559139	0.574901	1.018259	0.251323	Plot
palpy	pyast	ecliptic	fk4	0.060105	0.054222	0.068844	0.015143	Plot
palpy	pyephem	ecliptic	fk4	0.543957	0.554878	0.988669	0.244565	Plot
pyast	pyephem	ecliptic	fk4	0.577853	0.591075	1.036336	0.252163	Plot

ecliptic to fk5

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	ecliptic	fk5	12.176071	10.982941	13.949959	3.072341	Plot
astropy	novas	ecliptic	fk5	12.183666	10.983796	13.949868	3.071507	Plot
astropy	palpy	ecliptic	fk5	12.128188	10.935167	13.887797	3.057587	Plot
astropy	pyast	ecliptic	fk5	12.188460	10.989386	13.956636	3.072730	Plot
astropy	pyephem	ecliptic	fk5	12.176075	10.982942	13.949959	3.072340	Plot
casa	novas	ecliptic	fk5	0.036619	0.032998	0.042000	0.009518	Plot
casa	palpy	ecliptic	fk5	0.062989	0.057502	0.074091	0.016668	Plot
casa	pyast	ecliptic	fk5	0.036183	0.032943	0.041557	0.008885	Plot
casa	pyephem	ecliptic	fk5	0.000035	0.000031	0.000040	0.000009	Plot
novas	palpy	ecliptic	fk5	0.056831	0.051613	0.065971	0.015038	Plot
novas	pyast	ecliptic	fk5	0.020006	0.018190	0.023147	0.005122	Plot
novas	pyephem	ecliptic	fk5	0.036584	0.032967	0.041960	0.009509	Plot
palpy	pyast	ecliptic	fk5	0.060105	0.054222	0.068844	0.015143	Plot
palpy	pyephem	ecliptic	fk5	0.062990	0.057487	0.074073	0.016664	Plot
pyast	pyephem	ecliptic	fk5	0.036153	0.032916	0.041523	0.008877	Plot

ecliptic to galactic

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	ecliptic	galactic	11.747090	10.601178	13.470270	2.971002	Plot
astropy	palpy	ecliptic	galactic	12.127859	10.935080	13.887731	3.057601	Plot
astropy	pyast	ecliptic	galactic	12.188131	10.989299	13.956571	3.072743	Plot
astropy	pyephem	ecliptic	galactic	12.172479	10.979089	13.945046	3.071261	Plot
casa	palpy	ecliptic	galactic	0.423789	0.380396	0.479313	0.105126	Plot
casa	pyast	ecliptic	galactic	0.474529	0.428917	0.540607	0.118229	Plot
casa	pyephem	ecliptic	galactic	0.452386	0.410633	0.518261	0.113368	Plot
palpy	pyast	ecliptic	galactic	0.060105	0.054222	0.068844	0.015143	Plot
palpy	pyephem	ecliptic	galactic	0.058886	0.053390	0.068898	0.015687	Plot
pyast	pyephem	ecliptic	galactic	0.035177	0.032202	0.040494	0.008559	Plot

ecliptic to icrs

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	ecliptic	icrs	12.162721	10.969523	13.932065	3.067761	Plot
astropy	novas	ecliptic	icrs	12.169467	10.970410	13.932002	3.066932	Plot
astropy	palpy	ecliptic	icrs	12.128188	10.935167	13.887797	3.057587	Plot
astropy	pyast	ecliptic	icrs	12.188459	10.989386	13.956636	3.072730	Plot
casa	novas	ecliptic	icrs	0.036619	0.032998	0.042000	0.009518	Plot
casa	palpy	ecliptic	icrs	0.041801	0.038337	0.049150	0.010923	Plot
casa	pyast	ecliptic	icrs	0.029219	0.026383	0.033100	0.007166	Plot
novas	palpy	ecliptic	icrs	0.042302	0.038737	0.048756	0.010579	Plot
novas	pyast	ecliptic	icrs	0.027330	0.024660	0.031674	0.007067	Plot
palpy	pyast	ecliptic	icrs	0.060105	0.054222	0.068844	0.015143	Plot

fk4 to ecliptic

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	fk4	ecliptic	12.040722	10.868632	13.951088	3.196444	Plot
astropy	palpy	fk4	ecliptic	11.985431	10.820986	13.888844	3.182153	Plot
astropy	pyast	fk4	ecliptic	12.044888	10.874632	13.957682	3.197933	Plot
astropy	pyephem	fk4	ecliptic	2159.911813	1948.949561	2501.029890	573.269310	Plot
casa	palpy	fk4	ecliptic	0.063353	0.057303	0.074093	0.017007	Plot
casa	pyast	fk4	ecliptic	0.036432	0.033074	0.041561	0.008952	Plot
casa	pyephem	fk4	ecliptic	2171.891432	1959.817222	2514.975798	576.465454	Plot
palpy	pyast	fk4	ecliptic	0.059451	0.053648	0.068844	0.015781	Plot
palpy	pyephem	fk4	ecliptic	2171.836776	1959.769896	2514.914473	576.451267	Plot
pyast	pyephem	fk4	ecliptic	2171.896226	1959.823544	2514.983311	576.467048	Plot

fk4 to fk5

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	fk4	fk5	0.004455	0.004223	0.006195	0.001324	Plot
astropy	palpy	fk4	fk5	0.004455	0.004223	0.006196	0.001324	Plot
astropy	pyast	fk4	fk5	0.004455	0.004223	0.006196	0.001324	Plot
astropy	pyephem	fk4	fk5	0.564695	0.574742	1.020210	0.254929	Plot
casa	palpy	fk4	fk5	0.000006	0.000005	0.000007	0.000002	Plot
casa	pyast	fk4	fk5	0.000006	0.000005	0.000007	0.000002	Plot
casa	pyephem	fk4	fk5	0.565963	0.575007	1.019602	0.254423	Plot
palpy	pyast	fk4	fk5	0.000000	0.000000	0.000000	0.000000	Plot
palpy	pyephem	fk4	fk5	0.565967	0.575010	1.019607	0.254424	Plot
pyast	pyephem	fk4	fk5	0.565967	0.575010	1.019607	0.254424	Plot

fk4 to galactic

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	fk4	galactic	0.297078	0.270358	0.342891	0.076601	Plot
astropy	palpy	fk4	galactic	0.217933	0.196145	0.249069	0.055752	Plot
astropy	pyast	fk4	galactic	0.217933	0.196145	0.249069	0.055752	Plot
astropy	pyephem	fk4	galactic	0.459495	0.458131	0.860151	0.230676	Plot
casa	palpy	fk4	galactic	0.305000	0.309451	0.586296	0.156885	Plot
casa	pyast	fk4	galactic	0.305000	0.309451	0.586296	0.156885	Plot
casa	pyephem	fk4	galactic	0.452848	0.408335	0.518503	0.114099	Plot
palpy	pyast	fk4	galactic	0.000000	0.000000	0.000000	0.000000	Plot
palpy	pyephem	fk4	galactic	0.563261	0.569953	1.012050	0.253002	Plot
pyast	pyephem	fk4	galactic	0.563261	0.569953	1.012050	0.253002	Plot

fk4 to icrs

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	fk4	icrs	0.024104	0.021804	0.029028	0.006514	Plot
astropy	palpy	fk4	icrs	0.004461	0.004223	0.006199	0.001325	Plot
astropy	pyast	fk4	icrs	0.004461	0.004223	0.006199	0.001325	Plot
casa	palpy	fk4	icrs	0.025795	0.023360	0.030027	0.006850	Plot
casa	pyast	fk4	icrs	0.025795	0.023360	0.030027	0.006850	Plot
palpy	pyast	fk4	icrs	0.000000	0.000000	0.000000	0.000000	Plot

fk5 to ecliptic

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	fk5	ecliptic	12.040405	10.868485	13.949966	3.196385	Plot
astropy	novas	fk5	ecliptic	12.042833	10.868937	13.949851	3.196657	Plot
astropy	palpy	fk5	ecliptic	11.987949	10.820832	13.887806	3.182083	Plot
astropy	pyast	fk5	ecliptic	12.047118	10.874478	13.956645	3.197862	Plot
astropy	pyephem	fk5	ecliptic	12.040407	10.868485	13.949966	3.196385	Plot
casa	novas	fk5	ecliptic	0.036620	0.032998	0.042000	0.009518	Plot
casa	palpy	fk5	ecliptic	0.063328	0.057304	0.074092	0.017004	Plot
casa	pyast	fk5	ecliptic	0.036442	0.033079	0.041557	0.008934	Plot
casa	pyephem	fk5	ecliptic	0.000035	0.000031	0.000040	0.000009	Plot
novas	palpy	fk5	ecliptic	0.056558	0.051305	0.065971	0.015098	Plot
novas	pyast	fk5	ecliptic	0.020125	0.018223	0.023147	0.005180	Plot
novas	pyephem	fk5	ecliptic	0.036585	0.032967	0.041960	0.009509	Plot
palpy	pyast	fk5	ecliptic	0.059451	0.053648	0.068844	0.015780	Plot
palpy	pyephem	fk5	ecliptic	0.063304	0.057289	0.074073	0.017000	Plot
pyast	pyephem	fk5	ecliptic	0.036411	0.033053	0.041523	0.008926	Plot

fk5 to fk4

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	fk5	fk4	0.004462	0.004223	0.006212	0.001324	Plot
astropy	palpy	fk5	fk4	0.004450	0.004217	0.006194	0.001322	Plot
astropy	pyast	fk5	fk4	0.004450	0.004217	0.006194	0.001322	Plot
astropy	pyephem	fk5	fk4	0.564713	0.574624	1.020036	0.254973	Plot
casa	palpy	fk5	fk4	0.000014	0.000014	0.000156	0.000009	Plot
casa	pyast	fk5	fk4	0.000014	0.000014	0.000156	0.000009	Plot
casa	pyephem	fk5	fk4	0.564780	0.574895	1.019429	0.254469	Plot
palpy	pyast	fk5	fk4	0.000000	0.000000	0.000000	0.000000	Plot
palpy	pyephem	fk5	fk4	0.564797	0.574896	1.019420	0.254471	Plot
pyast	pyephem	fk5	fk4	0.564797	0.574896	1.019420	0.254471	Plot

fk5 to galactic

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	fk5	galactic	0.458094	0.413288	0.524942	0.115604	Plot
astropy	palpy	fk5	galactic	0.001235	0.001110	0.001414	0.000319	Plot
astropy	pyast	fk5	galactic	0.001235	0.001110	0.001414	0.000319	Plot
astropy	pyephem	fk5	galactic	0.007900	0.007151	0.009162	0.002086	Plot
casa	palpy	fk5	galactic	0.457973	0.413190	0.524860	0.115613	Plot
casa	pyast	fk5	galactic	0.457973	0.413190	0.524860	0.115613	Plot
casa	pyephem	fk5	galactic	0.452300	0.408086	0.518261	0.114089	Plot
palpy	pyast	fk5	galactic	0.000000	0.000000	0.000000	0.000000	Plot
palpy	pyephem	fk5	galactic	0.008617	0.007782	0.009988	0.002287	Plot
pyast	pyephem	fk5	galactic	0.008617	0.007782	0.009988	0.002287	Plot

fk5 to icrs

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	fk5	icrs	0.025768	0.023355	0.030023	0.006856	Plot
astropy	novas	fk5	icrs	0.025767	0.023355	0.030023	0.006856	Plot
astropy	palpy	fk5	icrs	0.000000	0.000000	0.000000	0.000000	Plot
astropy	pyast	fk5	icrs	0.000000	0.000000	0.000000	0.000000	Plot
casa	novas	fk5	icrs	0.000000	0.000000	0.000001	0.000000	Plot
casa	palpy	fk5	icrs	0.025768	0.023355	0.030023	0.006856	Plot
casa	pyast	fk5	icrs	0.025768	0.023355	0.030023	0.006856	Plot
novas	palpy	fk5	icrs	0.025767	0.023355	0.030023	0.006856	Plot
novas	pyast	fk5	icrs	0.025767	0.023355	0.030023	0.006856	Plot
palpy	pyast	fk5	icrs	0.000000	0.000000	0.000000	0.000000	Plot

galactic to ecliptic

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	galactic	ecliptic	11.747113	10.625375	13.470301	3.019763	Plot
astropy	palpy	galactic	ecliptic	12.088482	10.952434	13.887739	3.111544	Plot
astropy	pyast	galactic	ecliptic	12.148645	11.006717	13.956578	3.126967	Plot
astropy	pyephem	galactic	ecliptic	12.134777	10.998102	13.945060	3.124617	Plot
casa	palpy	galactic	ecliptic	0.412931	0.376211	0.479308	0.105471	Plot
casa	pyast	galactic	ecliptic	0.465077	0.424541	0.540597	0.118943	Plot
casa	pyephem	galactic	ecliptic	0.446826	0.407091	0.518249	0.114453	Plot
palpy	pyast	galactic	ecliptic	0.060143	0.054286	0.068844	0.015425	Plot
palpy	pyephem	galactic	ecliptic	0.060528	0.054900	0.068899	0.015147	Plot
pyast	pyephem	galactic	ecliptic	0.035078	0.031852	0.040494	0.009102	Plot

galactic to fk4

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	galactic	fk4	0.294912	0.268313	0.342896	0.078400	Plot
astropy	palpy	galactic	fk4	0.217123	0.195032	0.249037	0.056381	Plot
astropy	pyast	galactic	fk4	0.217123	0.195032	0.249037	0.056381	Plot
astropy	pyephem	galactic	fk4	0.448513	0.449965	0.858774	0.226540	Plot
casa	palpy	galactic	fk4	0.289300	0.305089	0.586087	0.153734	Plot
casa	pyast	galactic	fk4	0.289300	0.305089	0.586087	0.153734	Plot
casa	pyephem	galactic	fk4	0.447031	0.407285	0.518496	0.114508	Plot
palpy	pyast	galactic	fk4	0.000000	0.000000	0.000000	0.000000	Plot
palpy	pyephem	galactic	fk4	0.543986	0.560180	1.009565	0.241864	Plot
pyast	pyephem	galactic	fk4	0.543986	0.560180	1.009565	0.241864	Plot

galactic to fk5

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	galactic	fk5	0.453846	0.412306	0.524934	0.116004	Plot
astropy	palpy	galactic	fk5	0.001213	0.001098	0.001414	0.000326	Plot
astropy	pyast	galactic	fk5	0.001213	0.001098	0.001414	0.000326	Plot
astropy	pyephem	galactic	fk5	0.007893	0.007138	0.009162	0.002052	Plot
casa	palpy	galactic	fk5	0.453866	0.412239	0.524856	0.116004	Plot
casa	pyast	galactic	fk5	0.453866	0.412239	0.524856	0.116004	Plot
casa	pyephem	galactic	fk5	0.446820	0.407091	0.518249	0.114454	Plot
palpy	pyast	galactic	fk5	0.000000	0.000000	0.000000	0.000000	Plot
palpy	pyephem	galactic	fk5	0.008570	0.007780	0.009988	0.002224	Plot
pyast	pyephem	galactic	fk5	0.008570	0.007780	0.009988	0.002224	Plot

galactic to icrs

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	galactic	icrs	0.445129	0.406172	0.517378	0.114207	Plot
astropy	palpy	galactic	icrs	0.001213	0.001098	0.001414	0.000326	Plot
astropy	pyast	galactic	icrs	0.001213	0.001098	0.001414	0.000326	Plot
casa	palpy	galactic	icrs	0.445291	0.406074	0.517262	0.114202	Plot
casa	pyast	galactic	icrs	0.445291	0.406074	0.517262	0.114202	Plot
palpy	pyast	galactic	icrs	0.000000	0.000000	0.000000	0.000000	Plot

icrs to ecliptic

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	icrs	ecliptic	12.026334	10.855031	13.932066	3.192086	Plot
astropy	novas	icrs	ecliptic	12.024710	10.855515	13.931998	3.192368	Plot
astropy	palpy	icrs	ecliptic	11.987949	10.820832	13.887806	3.182083	Plot
astropy	pyast	icrs	ecliptic	12.047119	10.874478	13.956645	3.197862	Plot
casa	novas	icrs	ecliptic	0.036619	0.032998	0.042000	0.009518	Plot
casa	palpy	icrs	ecliptic	0.041853	0.038088	0.049150	0.011165	Plot
casa	pyast	icrs	ecliptic	0.029060	0.026194	0.033101	0.007358	Plot
novas	palpy	icrs	ecliptic	0.041973	0.038386	0.048756	0.010878	Plot
novas	pyast	icrs	ecliptic	0.026856	0.024571	0.031674	0.007105	Plot
palpy	pyast	icrs	ecliptic	0.059451	0.053648	0.068844	0.015780	Plot

icrs to fk4

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	icrs	fk4	0.024150	0.021805	0.029027	0.006518	Plot
astropy	palpy	icrs	fk4	0.004450	0.004217	0.006194	0.001322	Plot
astropy	pyast	icrs	fk4	0.004450	0.004217	0.006194	0.001322	Plot
casa	palpy	icrs	fk4	0.025765	0.023354	0.030035	0.006857	Plot
casa	pyast	icrs	fk4	0.025765	0.023354	0.030035	0.006857	Plot
palpy	pyast	icrs	fk4	0.000000	0.000000	0.000000	0.000000	Plot

icrs to fk5

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	icrs	fk5	0.025768	0.023355	0.030023	0.006856	Plot
astropy	novas	icrs	fk5	0.025768	0.023355	0.030023	0.006856	Plot
astropy	palpy	icrs	fk5	0.000000	0.000000	0.000000	0.000000	Plot
astropy	pyast	icrs	fk5	0.000000	0.000000	0.000000	0.000000	Plot
casa	novas	icrs	fk5	0.000000	0.000000	0.000001	0.000000	Plot
casa	palpy	icrs	fk5	0.025768	0.023355	0.030023	0.006856	Plot
casa	pyast	icrs	fk5	0.025768	0.023355	0.030023	0.006856	Plot
novas	palpy	icrs	fk5	0.025768	0.023355	0.030023	0.006856	Plot
novas	pyast	icrs	fk5	0.025768	0.023355	0.030023	0.006856	Plot
palpy	pyast	icrs	fk5	0.000000	0.000000	0.000000	0.000000	Plot

icrs to galactic

Tool 1	Tool 2	System 1	System 2	Median	Mean	Max	Std. Dev.	Plot
astropy	casa	icrs	galactic	0.449871	0.408095	0.517387	0.113276	Plot
astropy	palpy	icrs	galactic	0.001235	0.001110	0.001414	0.000319	Plot
astropy	pyast	icrs	galactic	0.001235	0.001110	0.001414	0.000319	Plot
casa	palpy	icrs	galactic	0.450293	0.407967	0.517266	0.113281	Plot
casa	pyast	icrs	galactic	0.450293	0.407967	0.517266	0.113281	Plot
palpy	pyast	icrs	galactic	0.000000	0.000000	0.000000	0.000000	Plot