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A-Track: Detecting Moving Objects in FITS images.

License: GNU General Public License v3.0

Python 96.78% Shell 3.22%

asteroids astronomy image-processing

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a-track's Issues

Vmin, Vmax parametreleri

Öncelikle herkese selamlar,

Konunun tartışılması açısından bu konuyu issues'a taşıyayım dedim:) Dünkü toplantıda @tolgaatay hocanın hatırlatması ile detect.py modülü için asteroidlerin genel bir "Vmax" ve "Vmin" değerlerini belirlemek adına MPC ve NASA ADS üzerinde bir takım araştırmalar yaptım. @muratxkaplan hocanın tavsiyeleri doğrultusunda buradaki literatürdeki -Sky Motion ("/sec)- değerlerini inceledim. Özellikle NEO'ların "Atens" grubunu ve de uzak olmaları bakımından da Jupiter Trojans'larını inceledim. Bununla birlikte bizim kullandığımız veri setlerinin muhtemelen tamamı (en azından bendekiler) binning=2 de alınmış. Yani herbir piksel ölçeğimiz yaklaşık olarak 0.62". Binning=1 için bu değer 0.31"/piksel. Bende olan veri setlerini incelediğimde poz süreleri 100s - 800s arasında değişiyor. Bu bilgiler şimdilik dursun...

MPC üzerinde Atens ve Trojans'ların tamamınının Sky Motion ("/sec) değerlerini tarayan bir script yazdığım ve de Atens için;

Parametreler ("/sec)	Nesne
Vmax = 0.29	2005 VN5
Vmin = 0.013	2009 HE60

Trojans;

Parametreler ("/sec)	Nesne
Vmax = 0.014	2012 TY123
Vmin = 0.0001	Protesilaos

Bu veriler göz önünde bulundurulursa, binning 2 ile 0.62 "/px ölçekli verilerimiz için ortalama 100 saniye (s) poz süresi verilen bir görüntüde yavaş Trojanları asla farkedemeyiz. Yavaş için en az 105 dk poz vermemiz gerekli :) En hızlısını ise -bizim algoritmamız ile- en az 45 s poz vererek yakalayabiliriz.

Aten grubunun en hızlısı için en az 2 sn poz verilmesi yeterli olacaktır. En yavaşı içinse en az 50 s poz vermek yeterli olacaktır.

Sonuç olarak, bizler ardışık görüntülerde asteroidlerimiz için minimum 1 piksel yer değiştirme şartı aradığımız için Vmin değeri ön tanımlı olarak binning 2 için 0.62 "/sec (bin=1 için 0.31 "/sec) olmuş oluyor. Sadece belirli grupların aranması için ve de bulunanın hangi gruba dahil olduğu gibi tespitler için bu parametreler kullanılabilir. Bunun koda dönüştürülmesine öneriler de bittikten sonra başlıyorum. Özellikle @muratxkaplan hocadan öneriler, katkılar ve de düzeltmeler bekliyorum. Pek çok yanıldığım konu olabilir çünkü:)

Not: Görüntülerde 100-800 s aralığında değişen poz süreleri gördüm. Vmax parametresinin 0.29 "/sec olması durumunda 800 s poz süresi için interval değerimiz yaklaşık olarak 374 piksel oluyor. Bu durumu ayrıca değerlendirmemiz lazım diye düşünüyorum. Şimdilik benim ekleyeceklerim bu kadar:)

Görüşmek üzere:)

FITS header bug on alipy 2.0

Fixed align.py's affineremap header copying section with following changes:

Line 51:

   tofits(alifilepath, data, hdr = None, verbose = verbose)

to:

   if hdr:
       tofits(alifilepath, data, hdr = hdr, verbose = verbose)
   else:
       tofits(alifilepath, data, hdr = None, verbose = verbose)

problem with installation

Hello, I followed the step-by-step described for installation, however when I use the command: python3 atrack.py fits_dir "the following message appears: Python can not import alipy. Make sure alipy is installed". The problem is that I have alipy installed correctly. could you help me with this problem? Is there any documentation available? Thank you!

Installation and usage issues

Hi!
I am trying to install and test A-Track and I have encountered some issues:

I used an Ubuntu 20 image with python 3.8.5 and run the installation script and the installation finished successfully.
I am running Ubuntu in VirtualBox and have allocated 4 CPUs to it and 2 Gigs of memory.

Then on trying to run it I encountered the following issues:

osboxes@osboxes:~/soft/atrack$ python3 atrack.py -a /home/osboxes/soft/images/test/
Python cannot import sources.py. Make sure sources.py is in the same folder as atrack.py.

In order to understand what was the issue, I created this simple file to see what is the problem

osboxes@osboxes:~/soft/atrack$ cat test.py 
import sources

and then I run it and I got thie exception

osboxes@osboxes:~/soft/atrack$ python3 test.py 
Traceback (most recent call last):
  File "test.py", line 1, in <module>
    import sources
  File "/home/osboxes/soft/atrack/sources.py", line 24, in <module>
    from astrolib import astronomy
ModuleNotFoundError: No module named 'astrolib'

after copying astrolib from https://github.com/yucelkilic/astrolib

osboxes@osboxes:~/soft/atrack$ python3 test.py 
Traceback (most recent call last):
  File "test.py", line 1, in <module>
    import sources
  File "/home/osboxes/soft/atrack/sources.py", line 24, in <module>
    from astrolib import astronomy
  File "/home/osboxes/soft/atrack/astrolib/astronomy.py", line 12, in <module>
    from ccdproc import ImageFileCollection
ModuleNotFoundError: No module named 'ccdproc'

after sudo pip3 instlal ccdproc

osboxes@osboxes:~/soft/atrack$ python3 test.py 
WARNING: AstropyDeprecationWarning: block_reduce was moved to the astropy.nddata.blocks module.  Please update your import statement. [astropy.nddata.utils]
WARNING: AstropyDeprecationWarning: block_replicate was moved to the astropy.nddata.blocks module.  Please update your import statement. [astropy.nddata.utils]
Traceback (most recent call last):
  File "test.py", line 1, in <module>
    import sources
  File "/home/osboxes/soft/atrack/sources.py", line 24, in <module>
    from astrolib import astronomy
  File "/home/osboxes/soft/atrack/astrolib/astronomy.py", line 24, in <module>
    import sep
ModuleNotFoundError: No module named 'sep'

after sudo pip3 install sep

sboxes@osboxes:~/soft/atrack$ python3 test.py 
WARNING: AstropyDeprecationWarning: block_reduce was moved to the astropy.nddata.blocks module.  Please update your import statement. [astropy.nddata.utils]
WARNING: AstropyDeprecationWarning: block_replicate was moved to the astropy.nddata.blocks module.  Please update your import statement. [astropy.nddata.utils]
Traceback (most recent call last):
  File "test.py", line 1, in <module>
    import sources
  File "/home/osboxes/soft/atrack/sources.py", line 24, in <module>
    from astrolib import astronomy
  File "/home/osboxes/soft/atrack/astrolib/astronomy.py", line 25, in <module>
    import sewpy
ModuleNotFoundError: No module named 'sewpy'

after a manual installation of
https://github.com/megalut/sewpy

osboxes@osboxes:~/soft/sewpy$ sudo python3 setup.py install
running install
running build
running build_py
running install_lib
creating /usr/local/lib/python3.8/dist-packages/sewpy
copying build/lib/sewpy/sewpy.py -> /usr/local/lib/python3.8/dist-packages/sewpy
copying build/lib/sewpy/__init__.py -> /usr/local/lib/python3.8/dist-packages/sewpy
byte-compiling /usr/local/lib/python3.8/dist-packages/sewpy/sewpy.py to sewpy.cpython-38.pyc
byte-compiling /usr/local/lib/python3.8/dist-packages/sewpy/__init__.py to __init__.cpython-38.pyc
running install_egg_info
Writing /usr/local/lib/python3.8/dist-packages/sewpy-1.0dev.egg-info

I received no more errors.

But then when I try to run A-track I get the following exception :

osboxes@osboxes:~/soft/atrack$ ls /home/osboxes/soft/images2
atrack                                      L_2020-06-06_22-32-12_Bin1x1_120s__10C.fit
L_2020-06-06_22-26-43_Bin1x1_120s__10C.fit  L_2020-06-06_22-34-35_Bin1x1_120s__10C.fit
L_2020-06-06_22-29-33_Bin1x1_120s__10C.fit  L_2020-06-06_22-37-35_Bin1x1_120s__10C.fit
osboxes@osboxes:~/soft/atrack$ python3 atrack.py -a /home/osboxes/soft/images2
WARNING: AstropyDeprecationWarning: block_reduce was moved to the astropy.nddata.blocks module.  Please update your import statement. [astropy.nddata.utils]
WARNING: AstropyDeprecationWarning: block_replicate was moved to the astropy.nddata.blocks module.  Please update your import statement. [astropy.nddata.utils]

Creating catalog files... Complete!
Catalog files are saved as *affineremap.pysexcat.
Elapsed time: 0 min 0 sec.

Building master catalog file... Complete!
Master catalog file is saved as master.pysexcat.
Elapsed time: 0 min 0 sec.

Detecting candidates... Complete!
Candidates for each image are saved as *affineremap.cnd.
Elapsed time: 0 min 0 sec.

Detecting moving objects...

multiprocessing.pool.RemoteTraceback: 
"""
Traceback (most recent call last):
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 125, in worker
    result = (True, func(*args, **kwds))
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 48, in mapstar
    return list(map(*args))
  File "/home/osboxes/soft/atrack/asteroids.py", line 356, in detect_segments
    partition = partitions(workload)[int(processor)]
IndexError: list index out of range
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/osboxes/soft/atrack/asteroids.py", line 511, in detect_lines
    pool.map(detect_segments, cmds, 1)
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 364, in map
    return self._map_async(func, iterable, mapstar, chunksize).get()
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 771, in get
    raise self._value
IndexError: list index out of range

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "atrack.py", line 170, in <module>
    lines = asteroids.detect_lines(outdir, fitsdir)
  File "/home/osboxes/soft/atrack/asteroids.py", line 514, in detect_lines
    detect_segments((catdir, fitsdir, 0))
  File "/home/osboxes/soft/atrack/asteroids.py", line 356, in detect_segments
    partition = partitions(workload)[int(processor)]
IndexError: list index out of range

Any help would be appreciated.
Thanks!

problem when executing without aligning images

Hi!
I wanted to post a little issue I faced, which is that when I use for the first time the -a option (not to align the images) then the process fails.

I am using aligned images so there is no need to align again.

If, however, I use the option -a even once, then the problem goes away:

Below is an exert from running atrack for the first time on a set of images with the -a option (fails). Then running it without the -a option (ok) and then running it with the -a option (ok).

Thank you in advance,
Petros

osboxes@osboxes:~/soft/atrack$ python3 atrack.py -a /home/osboxes/soft/img-test/ --skip-mpcreport
WARNING: AstropyDeprecationWarning: block_reduce was moved to the astropy.nddata.blocks module.  Please update your import statement. [astropy.nddata.utils]
WARNING: AstropyDeprecationWarning: block_replicate was moved to the astropy.nddata.blocks module.  Please update your import statement. [astropy.nddata.utils]

Creating catalog files... Complete!
Catalog files are saved as *affineremap.pysexcat.
Elapsed time: 0 min 0 sec.

Building master catalog file... Complete!
Master catalog file is saved as master.pysexcat.
Elapsed time: 0 min 0 sec.

Detecting candidates... Complete!
Candidates for each image are saved as *affineremap.cnd.
Elapsed time: 0 min 0 sec.

Detecting moving objects...

multiprocessing.pool.RemoteTraceback: 
"""
Traceback (most recent call last):
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 125, in worker
    result = (True, func(*args, **kwds))
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 48, in mapstar
    return list(map(*args))
  File "/home/osboxes/soft/atrack/asteroids.py", line 356, in detect_segments
    partition = partitions(workload)[int(processor)]
IndexError: list index out of range
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/osboxes/soft/atrack/asteroids.py", line 511, in detect_lines
    pool.map(detect_segments, cmds, 1)
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 364, in map
    return self._map_async(func, iterable, mapstar, chunksize).get()
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 771, in get
    raise self._value
IndexError: list index out of range

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "atrack.py", line 170, in <module>
    lines = asteroids.detect_lines(outdir, fitsdir)
  File "/home/osboxes/soft/atrack/asteroids.py", line 514, in detect_lines
    detect_segments((catdir, fitsdir, 0))
  File "/home/osboxes/soft/atrack/asteroids.py", line 356, in detect_segments
    partition = partitions(workload)[int(processor)]
IndexError: list index out of range
osboxes@osboxes:~/soft/atrack$ python3 atrack.py /home/osboxes/soft/img-test/ --skip-mpcreport
WARNING: AstropyDeprecationWarning: block_reduce was moved to the astropy.nddata.blocks module.  Please update your import statement. [astropy.nddata.utils]
WARNING: AstropyDeprecationWarning: block_replicate was moved to the astropy.nddata.blocks module.  Please update your import statement. [astropy.nddata.utils]

Aligning images... Complete!
Aligned images are saved as *affineremap.fits.
Elapsed time: 0 min 4 sec.

Creating catalog files... Complete!
Catalog files are saved as *affineremap.pysexcat.
Elapsed time: 0 min 5 sec.

Building master catalog file... Complete!
Master catalog file is saved as master.pysexcat.
Elapsed time: 0 min 6 sec.

Detecting candidates... Complete!
Candidates for each image are saved as *affineremap.cnd.
Elapsed time: 0 min 12 sec.

Detecting moving objects...


Moving object detection completed.
Elapsed time: 0 min 28 sec.
========================================================

MOVING OBJECTS:

ObjectID FileID Flags     x        y      R.A. (J2000) ... Background   Mag    MagErr  FWHM Elongation  Sky Motion 
                         pix      pix                  ...     ct       mag     mag    pix             arcsec / min
-------- ------ ----- --------- -------- ------------- ... ---------- -------- ------ ----- ---------- ------------
       1      0     3  605.1382 692.7117 18:18:45.4532 ...   1638.459 -14.2136 0.0076 46.75      1.883         0.12
       1      2     0  579.6606 674.6077 18:18:48.8527 ...   1639.727 -10.7200 0.0335  8.28      1.662         0.12
       1      3     3  611.3987 698.2013 18:18:44.4365 ...   1628.014 -11.7545 0.0187 11.34      1.675         0.12
       1      4     0  509.9719 624.7684 18:18:58.2095 ...   1596.471 -11.0898 0.0293  7.99      1.646         0.12
       1      4     3  613.7111 700.4058 18:18:44.0302 ...   1628.215 -13.1827 0.0118 31.63      1.419         0.12
       2      0     3  647.5764 668.6549 18:18:49.2387 ...   1667.003 -11.6909 0.0201 12.06      1.701         0.52
       2      3     0  637.0912 572.9730 18:19:06.0125 ...   1650.647  -9.9202 0.0517  4.36      1.251         0.52
       2      4     0  642.0468 617.5005 18:18:58.2056 ...   1670.842  -9.4873 0.0654  5.53      1.364         0.52
       4      1     2 1223.9995 632.0355 18:18:50.0897 ...   1524.875  -8.9934 0.0473  1.99      1.197         0.59
       4      3     0 1205.1390 740.8665 18:18:31.3378 ...   1508.630  -8.5291 0.1135  4.48      1.243         0.59
       4      4     0 1214.4993 686.9253 18:18:40.6322 ...   1515.009  -8.2646 0.1102  2.86      1.569         0.59
========================================================

UNCERTAIN OBJECTS:

ObjectID FileID Flags    x        y      R.A. (J2000) ... Background   Mag   MagErr FWHM Elongation  Sky Motion 
                        pix      pix                  ...     ct       mag    mag   pix             arcsec / min
-------- ------ ----- -------- -------- ------------- ... ---------- ------- ------ ---- ---------- ------------
       3      1     0 867.9043  42.3083 18:20:36.1857 ...   1579.002 -8.4019 0.0998 3.46      1.334         0.01
       3      3     0 867.5408  41.8073 18:20:36.2765 ...   1578.461 -9.3410 0.0700 4.03      1.242         0.01
       3      4     0 868.3584  42.7328 18:20:36.1073 ...   1574.120 -8.8675 0.0802 3.55      1.147         0.01
       5      2     3 643.0405 618.4986 18:18:58.0222 ...   1678.731 -9.7712 0.0534 3.58      1.242         0.07
       5      3     0 663.3389 606.4625 18:18:59.9241 ...   1671.506 -9.4786 0.0622 5.37      1.985         0.07
       5      4     0 647.5551 615.7062 18:18:58.4653 ...   1672.330 -9.4462 0.0685 7.27      1.857         0.07

A-Track has detected 0 moving objects and 0 uncertain objects.

Creating PNG files...

/home/osboxes/soft/img-test//atrack/L_2020-08-17_22-44-18_Bin1x1_120s__10C.reg_mono_wcs_affineremap.fits converted to png.
/home/osboxes/soft/img-test//atrack/L_2020-08-17_22-47-18_Bin1x1_120s__10C.reg_mono_wcs_affineremap.fits converted to png.
/home/osboxes/soft/img-test//atrack/L_2020-08-17_23-00-50_Bin1x1_120s__10C.reg_mono_wcs_affineremap.fits converted to png.
/home/osboxes/soft/img-test//atrack/L_2020-08-17_23-26-29_Bin1x1_120s__10C.reg_mono_wcs_affineremap.fits converted to png.
/home/osboxes/soft/img-test//atrack/L_2020-08-17_23-46-04_Bin1x1_120s__10C.reg_mono_wcs_affineremap.fits converted to png.

PNG conversion completed.
Elapsed Time: 0 min 30 sec.

Creating GIF (animation) file...
/home/osboxes/soft/img-test//atrack/animation.gif created.
Elapsed Time: 0 min 30 sec.

osboxes@osboxes:~/soft/atrack$ python3 atrack.py -a /home/osboxes/soft/img-test/ --skip-mpcreport
WARNING: AstropyDeprecationWarning: block_reduce was moved to the astropy.nddata.blocks module.  Please update your import statement. [astropy.nddata.utils]
WARNING: AstropyDeprecationWarning: block_replicate was moved to the astropy.nddata.blocks module.  Please update your import statement. [astropy.nddata.utils]

Creating catalog files... Complete!
Catalog files are saved as *affineremap.pysexcat.
Elapsed time: 0 min 1 sec.

Building master catalog file... Complete!
Master catalog file is saved as master.pysexcat.
Elapsed time: 0 min 1 sec.

Detecting candidates... Complete!
Candidates for each image are saved as *affineremap.cnd.
Elapsed time: 0 min 7 sec.

Detecting moving objects...


Moving object detection completed.
Elapsed time: 0 min 25 sec.
========================================================

MOVING OBJECTS:

ObjectID FileID Flags     x        y      R.A. (J2000) ... Background   Mag    MagErr  FWHM Elongation  Sky Motion 
                         pix      pix                  ...     ct       mag     mag    pix             arcsec / min
-------- ------ ----- --------- -------- ------------- ... ---------- -------- ------ ----- ---------- ------------
       1      0     3  605.1382 692.7117 18:18:45.4532 ...   1638.459 -14.2136 0.0076 46.75      1.883         0.12
       1      2     0  579.6606 674.6077 18:18:48.8527 ...   1639.727 -10.7200 0.0335  8.28      1.662         0.12
       1      3     3  611.3987 698.2013 18:18:44.4365 ...   1628.014 -11.7545 0.0187 11.34      1.675         0.12
       1      4     0  509.9719 624.7684 18:18:58.2095 ...   1596.471 -11.0898 0.0293  7.99      1.646         0.12
       1      4     3  613.7111 700.4058 18:18:44.0302 ...   1628.215 -13.1827 0.0118 31.63      1.419         0.12
       2      0     3  647.5764 668.6549 18:18:49.2387 ...   1667.003 -11.6909 0.0201 12.06      1.701         0.52
       2      3     0  637.0912 572.9730 18:19:06.0125 ...   1650.647  -9.9202 0.0517  4.36      1.251         0.52
       2      4     0  642.0468 617.5005 18:18:58.2056 ...   1670.842  -9.4873 0.0654  5.53      1.364         0.52
       4      1     2 1223.9995 632.0355 18:18:50.0897 ...   1524.875  -8.9934 0.0473  1.99      1.197         0.59
       4      3     0 1205.1390 740.8665 18:18:31.3378 ...   1508.630  -8.5291 0.1135  4.48      1.243         0.59
       4      4     0 1214.4993 686.9253 18:18:40.6322 ...   1515.009  -8.2646 0.1102  2.86      1.569         0.59
========================================================

UNCERTAIN OBJECTS:

ObjectID FileID Flags    x        y      R.A. (J2000) ... Background   Mag   MagErr FWHM Elongation  Sky Motion 
                        pix      pix                  ...     ct       mag    mag   pix             arcsec / min
-------- ------ ----- -------- -------- ------------- ... ---------- ------- ------ ---- ---------- ------------
       3      1     0 867.9043  42.3083 18:20:36.1857 ...   1579.002 -8.4019 0.0998 3.46      1.334         0.01
       3      3     0 867.5408  41.8073 18:20:36.2765 ...   1578.461 -9.3410 0.0700 4.03      1.242         0.01
       3      4     0 868.3584  42.7328 18:20:36.1073 ...   1574.120 -8.8675 0.0802 3.55      1.147         0.01
       5      2     3 643.0405 618.4986 18:18:58.0222 ...   1678.731 -9.7712 0.0534 3.58      1.242         0.07
       5      3     0 663.3389 606.4625 18:18:59.9241 ...   1671.506 -9.4786 0.0622 5.37      1.985         0.07
       5      4     0 647.5551 615.7062 18:18:58.4653 ...   1672.330 -9.4462 0.0685 7.27      1.857         0.07

A-Track has detected 0 moving objects and 0 uncertain objects.

Creating PNG files...

/home/osboxes/soft/img-test//atrack/L_2020-08-17_22-44-18_Bin1x1_120s__10C.reg_mono_wcs_affineremap.fits converted to png.
/home/osboxes/soft/img-test//atrack/L_2020-08-17_22-47-18_Bin1x1_120s__10C.reg_mono_wcs_affineremap.fits converted to png.
/home/osboxes/soft/img-test//atrack/L_2020-08-17_23-00-50_Bin1x1_120s__10C.reg_mono_wcs_affineremap.fits converted to png.
/home/osboxes/soft/img-test//atrack/L_2020-08-17_23-26-29_Bin1x1_120s__10C.reg_mono_wcs_affineremap.fits converted to png.
/home/osboxes/soft/img-test//atrack/L_2020-08-17_23-46-04_Bin1x1_120s__10C.reg_mono_wcs_affineremap.fits converted to png.

PNG conversion completed.
Elapsed Time: 0 min 27 sec.

Creating GIF (animation) file...
/home/osboxes/soft/img-test//atrack/animation.gif created.
Elapsed Time: 0 min 27 sec.

Open software?

Dear all,

is this package usable for everyone? I'm interesting in something like this to manage a large amount of data that our telescope produce every single night. I'm pretty sure that there are some asteroids hidden in our fits images and I would like to find them. We generate about 13Gb of images every night.

please, let me know

best,

MilE

SExtractor error (RuntimeError: No cat : call makecat first! ) --debian based OSs

We use the SExtractor for detecting sources on FITS images. So, you should install SExtractor properly...

In Ubuntu >=12.10 or Debian based OSs sextractor's name changed as sextractor from sex. Alipy and pysex still use it as sex.

If alipy/pysex returns an error massage like that "RuntimeError: No cat : call makecat first!". Please run the following command(s);

To fix that issue use command line below:

sudo ln -s /usr/bin/sextractor /usr/bin/sex

Or,

To fix this issues, remove the SExtractor you installed from the Ubuntu's repository with;

$ sudo apt-get remove sextractor

$ wget https://db.tt/tEqIhvGN

Click and install the downloaded debian file...

simple align figure

A simple figure for aligning images with alipy.

akdeniz-uzay / a-track Goto Github PK

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Vmin, Vmax parametreleri

FITS header bug on alipy 2.0

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SExtractor error (RuntimeError: No cat : call makecat first! ) --debian based OSs

simple align figure

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