Timeline for question about ICRF/J2000 equinox orientation
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| Jun 24 at 17:21 | comment | added | truf | Dfferent software can treat ICRF(S) as barycenter-centered (which is more correct) or earth-centered (which seems to be a software legacy term). Like AGI STK (earth based) or Astropy (barycenter). I'll leave a 2 links to their documentation highlighting this problem: 1. STK. help.agi.com/stk/index.htm#stk/… 2. Astropy. docs.astropy.org/en/stable/api/astropy.coordinates.GCRS.html | |
| Jun 4, 2020 at 16:03 | history | edited | CommunityBot |
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| Sep 28, 2014 at 9:37 | comment | added | David Hammen | That's exactly right. Even though the ICRF is based on the very best modern astronomy can yield, the ICRF axes are ultimately based on a 2000+ year old concept. | |
| Sep 28, 2014 at 8:57 | vote | accept | thenumbernine | ||
| Sep 28, 2014 at 8:56 | comment | added | thenumbernine | The wiki page of ICRF says the coordinate system is centered at the Solar System Barycenter. en.wikipedia.org/wiki/International_Celestial_Reference_Frame . So to clarify, the axis vectors of the ICRF are based on the vector from the Earth to the Sun (at time of the Vernal equinox), while the coordinates themselves are based on the vector from the Sun to the Earth? I think I got it, thanks for the explanation. | |
| Sep 28, 2014 at 8:30 | history | edited | David Hammen | CC BY-SA 3.0 |
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| Sep 28, 2014 at 8:20 | history | answered | David Hammen | CC BY-SA 3.0 |