Meshtitsa Observatory · Bulgaria

Meshtitsa Observatory

Pernik, Bulgaria · Variable Star Photometry & Imaging

42.67° N 23.00° E Class 4 Bortle

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Current Operational Coefficient Set

Coefficient	Value	1σ	R²
T_ub	1.004	0.008	0.984
T_{u_ub}	0.073	0.005	0.618
T_{b_ub}	0.061	0.002	0.782
T_bv	1.128	0.005	0.991
T_{b_bv}	0.094	0.002	0.867
T_br	1.160	0.005	0.993
T_{b_br}	0.073	0.003	0.839
T_{v_bv}	−0.014	0.002	0.195
T_vr	1.231	0.010	0.976
T_{v_vr}	−0.025	0.003	0.165
T_{r_vr}	−0.209	0.006	0.773
T_{b_bi}	0.033	0.009	0.675
T_bi	1.032	0.019	0.998
T_ri	0.771	0.016	0.997
T_{r_ri}	−0.306	0.041	0.887
T_{i_ri}	−0.006	0.056	0.002
T_vi	1.015	0.020	0.997
T_{v_vi}	0.010	0.008	0.181
T_{i_vi}	−0.004	0.026	0.004
T_{r_vi}	−0.145	0.018	0.902

Transformation Equations

Band	Equation
U	U_s = U_c + (u_s−u_c) + T_{u_ub}T_ub [(u_s−b_s) − (u_c−b_c)]
B	B_s = m_B + T_{b_bv} {[(m_B−B_c) − (m_V−V_c)] / [1 − T_{b_bv} + T_{v_bv}]}
V	V_s = m_V + T_{v_bv} {[(m_B−B_c) − (m_V−V_c)] / [1 − T_{b_bv} + T_{v_bv}]}
R	R_s = m_R + T_{r_vi} [(V_s−V_c) − (I_s−I_c)]
I	I_s = I_c + [(m_I−I_c) + T_{i_vi}(V_s−V_c)] / (1 + T_{i_vi})

Legend: lowercase u, b, v, r, i = instrumental magnitudes; uppercase U, B, V, R, I = standard magnitudes; m_B, m_V, m_R, m_I = untransformed differential magnitudes before transformation; subscript s = target star; subscript c = comparison star; T = transformation coefficient.

Instrument & Setup

Component	Description
Telescope	Sky-Watcher Explorer PDS 0.25-m F/4.8 Newtonian
Coma Corrector	Baader MPCC Mark III
Camera	ZWO ASI533MM Pro CMOS, 3.76 µm pixels
Filters	Baader Bessel UBVRI photometric set