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Help with Plate Solving

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dradford
Help with Plate Solving

 

Hi All

I am a nebie having just started to use VShot.

I have been able to upload images with the Wizard and Quick load but cannot get the images to plate solve.

I took some images of R Car , and I am certian it is sitting directly in the middle of the field. I had to enter the RA/DEC fiquers manually into the Fits header as Image plus doesn't enter then automatically from Stellarium. I entereed the RA/DEC J2000 numbers as below at the time the shot was taken. I also chnged the time to UTC as it had entered local time.

I know there will be issues with the QHY10 colour camera and have uploaded a grey and green only file.

Fits header below

Any suggestions were I'm going wrong? Thankyou

 

Don Radford obs ID RDJA

 

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FITS Header of Image  634994826059683750.fts

Key

Value

Comment

SIMPLE

T

file does conform to FITS standard

BITPIX

16

number of bits per data pixel

NAXIS

2

number of data axes

NAXIS1

2610

length of data axis 1

NAXIS2

3894

length of data axis 2

EXTEND

T

FITS dataset may contain extensions

COMMENT

FITS (Flexible Image Transport System) format is defined in 'Astronomy

COMMENT

and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H

BZERO

32768

offset data range to that of unsigned short

BSCALE

1

default scaling factor

COMMENT

and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H

COMMENT

and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H

CREATOR

ImagesPlus Camera Control

Software created file

DATE-OBS

2013-03-21T09:53:36

[ISO 8601] UTC date/time of exposure start

DATE

21

03/13' / [old format] UTC date of exposure start

INSTRUME

QHYCCD QHY10 S

N' / Detector instrument name

OBJECT

R Car

Target object name

IMAGETYP

Light

Image Type

FILTER

V

Filter name

EXPOSURE

5.00000000000E+000

[sec] Duration of exposure

SET-TEMP

-20.

CCD target temperature in C

CCD-TEMP

-20.457

CCD temperature in C

OFFSET

0

Camera Offset

XBIN

1

X Bin Mode

YBIN

1

Y Bin Mode

XPIXSIZE

6.05

X Pixel Size

YPIXSIZE

6.05

Y Pixel Size

APERTURE

0.

Telescope aperture in mm

FOCALEN

0.

Focal length in mm

OBJCTRA

16 44 42.60

[hms J2000] Target right ascension

OBJCTDEC

-40 50 23.1

[dms +N J2000] Target declination

AIRMASS

1.34779496267E+000

 

EPOCH

2000

 

TELESCOP

Meade

Imageplus' / Telescope name

USERNAME

RDJA

 

EGAIN

0.450

 

LMAXADU

50000.000

 

ALT-OBS

4.00000000000E+001

[metres] Altitude above mean sea level

LONG-OBS

1.52896000000E+002

[deg +E WGS84] Geodetic longitude

HISTORY

File was processed by PinPoint 5.1.8 at 2013-03-22T00:10:05

EXPTIME

5.00000000000E+000

[sec] Duration of exposure

TIME-OBS

09:53:36

[old format] UTC time of exposure start

UT

09:53:36

[old format] UTC time of exposure start

TIMESYS

UTC

Default time system

RADECSYS

FK5

Equatorial coordinate system

RA

16 44 42.60

[hms J2000] Target right ascension

DEC

-40 50 23.1

[dms +N J2000] Target declination

CLRBAND

R

[J-C std] Std. color band of image or C=Color

HISTORY

File was processed by PinPoint 5.1.8 at 2013-03-22T00:17:52

FWHM

9.50134776980E+000

[pixels] Mean Full-Width-Half-Max of image star

 Version 3.1 Copyright © 2008 - BMO Software. All rights reserved 

uis01
I'd like to know too

I'll admit that I never correctly deciphered what VPHOT needs to do a good plate solution for my telescope so I have beenn running all my images through astronometry.net before uploading them.  I'd also like to see some more detailed technical help posted about this.

HBB
HBB's picture
Plate solving

I use Pinpoint with Maxim and it requires Pixel scale so it needs your focal length of the telescope along with pixel size.  I notice that focal length is not given in your fits file.   

Barbara (HBB)

TCB168
TCB168's picture
Plate Solving

You dont have to have the scope details in the fits header but you do need the RA and Dec.

You first have to work out the plate scale for your images. You can do this by uploading an image to http://nova.astrometry.net/ and let it plate solve an image. It will then give you a plate scale. My current setup gives 1.56arcsec/pixel. Yours will be different but should be a number between about 0.5 and 5.

You then have to create your telescope in VPhot. Go to the 'admin' tab and click on "telescope setup".
From there you select "create new teslescope setup"

Enter a name and fill in the boxes. Once you have done this you can upload an image using your telescope setup and it should plate solve.

Good luck

Terry

uis01
Fixed Mine... Might Help With Yours

I think I know what might really be wrong with this header because it was missing from my FITS headers also.  And when I added it in:  problem fixed.

This was the web page that helped me figure it out:

http://www.cyanogen.com/help/maximdl/PinPoint_Astrometry.htm

It turns out that Pinpoint needs the FITS header keywords CDELT1 and CDELT2 to contain the size of the CCD pixels (in arcseconds!) on the X (cdelt1) and Y (cdelt2) axes of the CCD.  Once I added those to my headers, Pinpoint in VPHOT was all green lights for me.  

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