A pearl in the shell: An ultra-compact dwarf within the tidal debris surrounding spiral galaxy NGC 7531

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Table 2.

Apparent magnitude, absolute magnitude, and luminosity obtained for the shell feature detected around NGC 7531.

	Magnitude	Magnitude	luminosity
	[mag]	[mag]	[L_⊙]
g	15.56 ± 0.002	$- 16 . 6_{- 0.5}^{+ 0.4}$ $Mathematical equation: $ -16.6^{+0.4}_{-0.5} $$	$3 . 59_{- 1.41}^{+ 1.76} \times 10^{8}$ $Mathematical equation: $ 3.59^{+1.76}_{-1.41}\times10^8 $$
r	14.98 ± 0.002	$- 17 . 2_{- 0.5}^{+ 0.4}$ $Mathematical equation: $ -17.2^{+0.4}_{-0.5} $$	$3 . 20_{- 1.26}^{+ 1.57} \times 10^{8}$ $Mathematical equation: $ 3.20^{+1.57}_{-1.26}\times10^8 $$
z	14.63 ± 0.002	$- 17 . 5_{- 0.5}^{+ 0.4}$ $Mathematical equation: $ -17.5^{+0.4}_{-0.5} $$	$4 . 42_{- 1.74}^{+ 2.17} \times 10^{8}$ $Mathematical equation: $ 4.42^{+2.17}_{-1.74}\times10^8 $$

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