[AstroPy] Fwd: Inverting SkyCoord spherical offset transformations

[shilpi jain]

---------- Forwarded message ---------
From: shilpi jain <shilpi1958 at gmail.com>
Date: Mon, Oct 29, 2018 at 7:36 PM
Subject: Re: [AstroPy] Inverting SkyCoord spherical offset transformations
To: <astropy at python.org>


Hi,
I was going through this problem and you mentioned "*I already have the
delta RA and delta Dec from an astrometric solution for that observation
and want to apply those deltas to the source positions to reproduce the
astrometric catalog positions" . *
>From what I understood won't you need to input the "*astrometric solution
for that observation" *but there isn't something like that in the proposed
solution.
Moreover in the solution we already have sky coords for the source
positions, we calculated the spherical offset between the two, changed the
frame, found the coords for the faint galaxy(galaxy coord) and converted it
back again to ICRS
I am a bit confused. Can you tell me exactly what the problem is and how is
the solution helpful?

Thanks

[image: Mailtrack]
<https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality5&>
Sender
notified by
Mailtrack
<https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality5&>
10/29/18,
7:29:04 PM

[image: Mailtrack]
<https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality5&>
Sender
notified by
Mailtrack
<https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality5&>
10/29/18,
7:45:40 PM
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/astropy/attachments/20181029/042f61ab/attachment.html>