MOA 2018-BLG-257

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Event Parameters

Internal ID:	gb4-R-9-72301
Discovery date:	2018-07-17T14:29:58
RA:	17:55:57.63
Dec:	-30:31:45.20
Current assessment:	microlensing

A transient event found by MOA.

Lightcurve

Finder chart

Nearest catalogued stars

starID	RA	Dec	mag	separation
21466	17:55:57.86	-30:31:46.99	16.69 ± 0.04	3.90
21572	17:55:57.60	-30:31:42.37	16.06 ± 0.14	3.57
21591	17:55:57.54	-30:31:46.34	17.71 ± 0.11	0.79
21651	17:55:57.34	-30:31:44.73	16.08 ± 0.05	3.45

Last 5 photometry measurements

Observation date	I mag	seeing
2460246.887 (2023-Oct-29.387)	17.87 ± 0.19	3.53
2460246.898 (2023-Oct-29.398)	18.05 ± 0.22	3.31
2460246.909 (2023-Oct-29.409)	20.60 ± 2.62	3.42
2460246.920 (2023-Oct-29.420)	20.39 ± 2.64	3.80
2460246.929 (2023-Oct-29.429)	99.99 ± 99.99	3.79

Calibration: I = 27.40 - 2.5 log₁₀(ΔF + 7530.09)

Single lens fit parameters

t_max	=	JD 2458321.27	±	0.04 UT (2018-Jul-21.77)
t_E	=	1.59	±	0.01 days
u₀	=	6.4134	±	0.0543
I_base	=	9.99	±	0.16

External data

Gzipped FITS finder chart

All photometry data

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