Table 3: Ephemerides of HT Cas.
Linear ephemeris:

BJDD = T₀ + $P_{0}\cdot E$

$T_{0} = 2443727.93804~(\pm 3)$ d $P_{0} = 0.0736472029~(\pm 3)$ d

$\chi^{2}_{\nu_{1}}= 56.9, \;\;\; \nu_{1}$ = 9 $\sigma_{1}= 29.0 \times 10^{-5}$ d

Quadratic ephemeris:

BJDD = T₀ + $P_{0}\cdot E$ + $c\cdot E^{2}$

$T_{0} = 2443727.93768~(\pm 3)$ d $P_{0} = 0.0736472230~(\pm 9)$ d

$c = (-137 \pm 7) \times 10^{-14}$ d $\sigma_{2} = 11.8 \times 10^{-5}$ d

$\chi^{2}_{\nu_{2}}= 9.47, \;\;\; \nu_{2}$ = 8

Sinusoidal ephemeris:

BJDD = T₀ + $P_{0}\cdot E$ + A $\cdot \cos~[2\pi (E-{\rm B})/{\rm C}]$

$T_{0}= 2443727.93828~(\pm 6)$ d $B = (89 \pm 4) \times 10^{3}$ cycles

$P_{0}= 0.073647200~(\pm 2)$ d $C = (180 \pm 20) \times 10^{3}$ cycles

$A = (46 \pm 6) \times 10^{-5}$ d $\sigma_{\rm S}= 6.79 \times 10^{-5}$ d

$\chi^{2}_{\nu_{\rm S}}= 3.11, \;\;\; \nu_{\rm S}= 6$

**Table 3:** Ephemerides of HT Cas.
Linear ephemeris:
BJDD = T₀ + $P_{0}\cdot E$
$T_{0} = 2443727.93804~(\pm 3)$ d	$P_{0} = 0.0736472029~(\pm 3)$ d
$\chi^{2}_{\nu_{1}}= 56.9, \;\;\; \nu_{1}$ = 9	$\sigma_{1}= 29.0 \times 10^{-5}$ d
Quadratic ephemeris:
BJDD = T₀ + $P_{0}\cdot E$ + $c\cdot E^{2}$
$T_{0} = 2443727.93768~(\pm 3)$ d	$P_{0} = 0.0736472230~(\pm 9)$ d
$c = (-137 \pm 7) \times 10^{-14}$ d	$\sigma_{2} = 11.8 \times 10^{-5}$ d
$\chi^{2}_{\nu_{2}}= 9.47, \;\;\; \nu_{2}$ = 8
Sinusoidal ephemeris:
BJDD = T₀ + $P_{0}\cdot E$ + A $\cdot \cos~[2\pi (E-{\rm B})/{\rm C}]$
$T_{0}= 2443727.93828~(\pm 6)$ d	$B = (89 \pm 4) \times 10^{3}$ cycles
$P_{0}= 0.073647200~(\pm 2)$ d	$C = (180 \pm 20) \times 10^{3}$ cycles
$A = (46 \pm 6) \times 10^{-5}$ d	$\sigma_{\rm S}= 6.79 \times 10^{-5}$ d
$\chi^{2}_{\nu_{\rm S}}= 3.11, \;\;\; \nu_{\rm S}= 6$

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