From c15ad2fcd21182787eb7db2195bfc70690efca2e Mon Sep 17 00:00:00 2001
From: "P. L. Lim" <2090236+pllim@users.noreply.github.com>
Date: Fri, 13 Oct 2023 14:40:52 -0400
Subject: [PATCH] Backport PR #15476: Account for SOFA/ERFA bugfix in pvstar

---
 astropy/units/tests/test_structured_erfa_ufuncs.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/astropy/units/tests/test_structured_erfa_ufuncs.py b/astropy/units/tests/test_structured_erfa_ufuncs.py
index 729f9539c7e..42589397a19 100644
--- a/astropy/units/tests/test_structured_erfa_ufuncs.py
+++ b/astropy/units/tests/test_structured_erfa_ufuncs.py
@@ -139,7 +139,11 @@ def test_pvstar(self):
         assert px.unit == u.arcsec
         assert_quantity_allclose(px, 1 * u.radian)
         assert rv.unit == u.km / u.s
-        assert_array_equal(rv.value, np.zeros(self.pv.shape))
+        # RV is non-zero because proper motion induces a small redshift
+        # due to second order Doppler shift.
+        assert_quantity_allclose(
+            rv, np.zeros(self.pv.shape) << (u.km / u.s), atol=1 * u.m / u.s
+        )
 
     def test_starpv(self):
         ra, dec, pmr, pmd, px, rv, stat = erfa_ufunc.pvstar(self.pv)