Use TRFLSQFitter instead of LevMarLSQFitter (#3202)

* Use TRFLSQFitter instead of LevMarLSQFitter
as per Astropy recommendation

* Copy updated blackbody test code from astropy

CHANGES.rst

@@ -95,11 +95,17 @@ Cubeviz
 - Custom Spectrum1D writer format ``jdaviz-cube`` is removed. Use ``wcs1d-fits`` from
   ``specutils`` instead. [#2094]
 
+- Aperture Photometry plugin now uses TRFLSQFitter to fit radial profile because LevMarLSQFitter
+  is no longer recommended by Astropy. [#3202]
+
 Imviz
 ^^^^^
 
 - Deprecated Rotate Canvas plugin was removed; use Orientation plugin instead. [#2878]
 
+- Aperture Photometry plugin now uses TRFLSQFitter to fit radial profile because LevMarLSQFitter
+  is no longer recommended by Astropy. [#3202]
+
 Mosviz
 ^^^^^^
 

jdaviz/configs/default/plugins/model_fitting/tests/test_blackbody.py

@@ -1,23 +1,16 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
 # copied and modified from astropy: https://github.com/astropy/astropy/pull/12304
-"""Tests for physical functions."""
-# pylint: disable=no-member, invalid-name
+"""Tests for blackbody functions."""
 import pytest
 import numpy as np
 
-from jdaviz.models import BlackBody
-from astropy.modeling.fitting import LevMarLSQFitter
-
-from astropy.tests.helper import assert_quantity_allclose
 from astropy import units as u
+from astropy.modeling.fitting import TRFLSQFitter
+from astropy.tests.helper import assert_quantity_allclose
+from astropy.utils.compat.optional_deps import HAS_SCIPY
 from astropy.utils.exceptions import AstropyUserWarning
-from astropy.utils.compat.optional_deps import HAS_SCIPY  # noqa
 
-
-__doctest_skip__ = ["*"]
-
-
-# BlackBody tests
+from jdaviz.models import BlackBody
 
 
 @pytest.mark.parametrize("temperature", (3000 * u.K, 2726.85 * u.deg_C))
@@ -61,10 +54,12 @@ def test_blackbody_return_units():
     assert b(1.0 * u.micron).unit == u.MJy / u.sr
 
 
-@pytest.mark.skipif("not HAS_SCIPY")
+@pytest.mark.skipif(not HAS_SCIPY, reason="requires scipy")
 def test_blackbody_fit():
 
-    fitter = LevMarLSQFitter()
+    fitter = TRFLSQFitter()
+    rtol = 0.54
+    atol = 1e-15
 
     b = BlackBody(3000 * u.K, scale=5e-17, output_units=u.Jy / u.sr)
 
@@ -73,8 +68,8 @@ def test_blackbody_fit():
 
     b_fit = fitter(b, wav, fnu, maxiter=1000)
 
-    assert_quantity_allclose(b_fit.temperature, 2840.7438355865065 * u.K)
-    assert_quantity_allclose(b_fit.scale, 5.803783292762381e-17)
+    assert_quantity_allclose(b_fit.temperature, 2840.7438355865065 * u.K, rtol=rtol)
+    assert_quantity_allclose(b_fit.scale, 5.803783292762381e-17, atol=atol)
 
 
 def test_blackbody_overflow():

jdaviz/configs/imviz/plugins/aper_phot_simple/aper_phot_simple.py

@@ -4,7 +4,7 @@
 
 import numpy as np
 from astropy import units as u
-from astropy.modeling.fitting import LevMarLSQFitter
+from astropy.modeling.fitting import TRFLSQFitter
 from astropy.modeling import Parameter
 from astropy.modeling.models import Gaussian1D
 from astropy.time import Time
@@ -876,7 +876,7 @@ def calculate_photometry(self, dataset=None, aperture=None, background=None,
 
                 # Fit Gaussian1D to radial profile data.
                 if self.fit_radial_profile:
-                    fitter = LevMarLSQFitter()
+                    fitter = TRFLSQFitter()
                     y_max = y_data.max()
                     x_mean = x_data[np.where(y_data == y_max)].mean()
                     std = 0.5 * (phot_table['semimajor_sigma'][0] +