<div dir="ltr"><img width="0" height="0" class="mailtrack-img" alt="" style="display:flex" src="https://mailtrack.io/trace/mail/acca5d657241379ebb4631d7347da0202507f611.png?u=3440560"><div></div><br><br><div class="gmail_quote"><div dir="ltr">---------- Forwarded message ---------<br>From: <strong class="gmail_sendername" dir="auto">shilpi jain</strong> <span dir="ltr"><<a href="mailto:shilpi1958@gmail.com">shilpi1958@gmail.com</a>></span><br>Date: Mon, Oct 29, 2018 at 7:36 PM<br>Subject: Re: [AstroPy] Inverting SkyCoord spherical offset transformations<br>To:  <<a href="mailto:astropy@python.org">astropy@python.org</a>><br></div><br><br><div dir="ltr"><img width="0" height="0" class="m_2023647625184887957mailtrack-img" alt="" style="display:flex" src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7"><div></div>Hi,<div>I was going through this problem and you mentioned "<i style="color:rgb(0,0,0);white-space:pre-wrap">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" . </i></div><div><font color="#000000"><span style="white-space:pre-wrap">From what I understood won't you need to input the "</span></font><i style="color:rgb(0,0,0);white-space:pre-wrap">astrometric solution for that observation" </i><span style="color:rgb(0,0,0);white-space:pre-wrap">but</span><i style="color:rgb(0,0,0);white-space:pre-wrap"> </i><span style="color:rgb(0,0,0);white-space:pre-wrap">there isn't something like that in the proposed solution.</span></div><div><font color="#000000"><span style="white-space:pre-wrap">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</span></font></div><div><span style="color:rgb(0,0,0);white-space:pre-wrap">I am a bit confused. Can you tell me exactly what the problem is and how is the solution helpful?</span></div><div><span style="color:rgb(0,0,0);white-space:pre-wrap"><br></span></div><div><span style="color:rgb(0,0,0);white-space:pre-wrap">Thanks</span></div><br><div class="m_2023647625184887957mt-signature">
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                    <span style="color:transparent;font-size:0">10/29/18, 7:29:04 PM</span>
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