Re: Adding Gaia Apertures - incorrect plate solution
Posted by
karenacollins on
Jun 20, 2020; 5:37am
URL: http://astroimagej.170.s1.nabble.com/Adding-Gaia-Apertures-incorrect-plate-solution-tp1374p1375.html
Hi Brad,
I have an LCO image of TIC 207425167. I solved it using ansvr and
then downloaded the Gaia apertures and imported them. They seem to
align as expected.
I suppose I'd need one of your images to understand more of what you
are seeing. If it's small enough, you can email it directly.
Karen
On 6/19/2020 8:57 AM, bswalter [via
AstroImageJ] wrote:
I Tried adding Gaia Apertures to Calibrated, plate solved images
of TIC TIC 207425167. The images were plate solved using the ANSVR
plut-in. The CRVAL1 RA and CRVAL2 DEC decimal positions are
correct for center of image pixel 1025,1025 (which in Sexagesimal
is 10 10 59.3 + 58 17 40.7 - almost exactly the coordinates of T1)
given in CRPIX1 and CRPIX2 fields and the IMAGEW and IMAGEH field
vlaues are correct. The coordinates of T1 and the other target
stars in the Gaia .radec file appear correct but they import
offset from their correct positions in the fiels by about 4.15
arcmin at approx PA 141 from where they should be Also if I put
the cursor the cursor on pixel 1025,1025 AIJ displays the
coordinates 16 10 38.86 + 58 20 51.3, the same offset at the
displacement of the apertures. I don't see the source of the
offset and I don't understand how CRVAL1 and CFVAL2 can be correct
and yet the positions displayed in AIJ with the cursor displayed
in AIJ for the same pixel can be off by about 4 arcmin. I can't
find the source of the offset and neither could Dennis Conti. The
images plate solved correctly
Brad Walter
Imported_Gaia_Apertures-R1.pngTIC_207425167_0001Cal.txtTIC_207425167_gaia_stars_1592431671.radec PS2
.
Brad Walter