opticam.noise

Functions

get_sky_stderr(N_source, N_pix, n_sky)	Get the standard error (in magnitudes) of the sky noise.
get_shot_stderr(N_source)	Get the standard error (in magnitudes) of the shot noise.
get_bias_stderr(N_source, N_pix, bias_var)	Get the standard error (in magnitudes) of the bias variance.
get_dark_stderr(N_source, N_pix, dark_var)	Get the standard error (in magnitudes) of the dark noise variance.
get_flat_stderr(N_source, N_pix, flat_var)	Get the standard error (in magnitudes) of the flat-field variance.
get_read_stderr(N_source, N_pix, read_noise)	Get the standard error (in magnitudes) of the readout noise.
get_scint_stderr(N_source, rel_scint_noise)	Get the standard error (in magnitudes) of the scintillation noise.
snr(N_source, N_pix, n_sky, bias_var, dark_var, ...)	The (simplified) S/N ratio equation or CCD Equation (see Chapter 4.4 of Handbook of CCD Astronomy by Howell, 2006).
snr_stderr(N_source, N_pix, n_sky, bias_var, dark_var, ...)	The standard error (in magnitudes) on the CCD Equation (see Chapter 4.4 of Handbook of CCD Astronomy by Howell,

Module Contents

opticam.noise.get_sky_stderr(N_source, N_pix, n_sky)

Get the standard error (in magnitudes) of the sky noise.

Parameters

N_sourcefloat

The total number of source counts.

N_pixint

The number of aperture pixels.

n_skyfloat

The number of sky counts per pixel.

Returns

float

The standard error (in magnitudes) of the sky noise.

Parameters:

• N_source (float)

• N_pix (float)

• n_sky (float)

Return type:

float

opticam.noise.get_shot_stderr(N_source)

Get the standard error (in magnitudes) of the shot noise.

Parameters

N_sourcefloat

The total number of source counts.

Returns

float

The standard error (in magnitudes) of the shot noise.

Parameters:

N_source (float)

Return type:

float

opticam.noise.get_bias_stderr(N_source, N_pix, bias_var)

Get the standard error (in magnitudes) of the bias variance.

Parameters

N_sourceQuantity

The total number of source counts.

N_pixint

The number of aperture pixels.

bias_varQuantity

The bias variance.

Returns

float

The standard error (in magnitudes) of the bias variance.

Parameters:

• N_source (float)

• N_pix (float)

• bias_var (float)

Return type:

float

opticam.noise.get_dark_stderr(N_source, N_pix, dark_var)

Get the standard error (in magnitudes) of the dark noise variance.

Parameters

N_sourcefloat

The total number of source counts.

N_pixint

The number of aperture pixels.

dark_varfloat

The dark noise variance.

Returns

float

The standard error (in magnitudes) of the dark noise.

Parameters:

• N_source (float)

• N_pix (float)

• dark_var (float)

Return type:

float

opticam.noise.get_flat_stderr(N_source, N_pix, flat_var)

Get the standard error (in magnitudes) of the flat-field variance.

Parameters

N_sourcefloat

The total number of source counts.

N_pixint

The number of aperture pixels.

flat_varfloat

The flat-field variance.

Returns

float

The standard error (in magnitudes) of the flat-field variance.

Parameters:

• N_source (float)

• N_pix (float)

• flat_var (float)

Return type:

float

opticam.noise.get_read_stderr(N_source, N_pix, read_noise)

Get the standard error (in magnitudes) of the readout noise.

Parameters

N_sourcefloat

The total number of source counts.

N_pixfloat

The number of aperture pixels.

read_noisefloat

The read noise of the detector in electrons/pixel.

Returns

float

The standard error (in magnitudes) of the readout noise.

Parameters:

• N_source (float)

• N_pix (float)

• read_noise (float)

Return type:

float

opticam.noise.get_scint_stderr(N_source, rel_scint_noise)

Get the standard error (in magnitudes) of the scintillation noise.

Parameters

N_sourcefloat | NDArray

The total number of source counts.

rel_scint_noisefloat

The relative scintillation noise.

Returns

float | NDArray

The standard error (in magnitudes) of the scintillation noise.

Parameters:

• N_source (float | numpy.typing.NDArray)

• rel_scint_noise (float)

Return type:

float | numpy.typing.NDArray

opticam.noise.snr(N_source, N_pix, n_sky, bias_var, dark_var, flat_var, read_noise, scint_noise)

The (simplified) S/N ratio equation or CCD Equation (see Chapter 4.4 of Handbook of CCD Astronomy by Howell, 2006).

Parameters

N_sourcefloat | NDArray

The total number of source counts.

N_pixint

The number of aperture pixels.

n_skyfloat

The number of sky counts per pixel.

bias_varfloat

The bias variance.

dark_varfloat

The dark noise variance.

flat_varfloat

The flat-field variance.

read_noisefloat

The read noise of the detector in electrons/pixel.

scint_noiseNDArray

The scintillation noise.

Returns

float | NDArray

The S/N ratio.

Parameters:

• N_source (float | numpy.typing.NDArray)

• N_pix (float)

• n_sky (float)

• bias_var (float)

• dark_var (float)

• flat_var (float)

• read_noise (float)

• scint_noise (numpy.typing.NDArray)

Return type:

float | numpy.typing.NDArray

opticam.noise.snr_stderr(N_source, N_pix, n_sky, bias_var, dark_var, flat_var, read_noise, rel_scint_noise)

The standard error (in magnitudes) on the CCD Equation (see Chapter 4.4 of Handbook of CCD Astronomy by Howell, 2006).

Parameters

N_sourcefloat | NDArray

The total number of source counts.

N_pixfloat

The number of aperture pixels.

n_skyfloat

The number of sky counts per pixel.

bias_varfloat

The bias variance.

dark_varfloat

The dark noise variance.

flat_varfloat

The flat-field variance.

read_noisefloat

The read noise of the detector in electrons/pixel.

rel_scint_noisefloat

The relative scintillation noise.

Returns

float | NDArray

The standard error (in magnitudes) on the S/N ratio.

Parameters:

• N_source (float | numpy.typing.NDArray)

• N_pix (float)

• n_sky (float)

• bias_var (float)

• dark_var (float)

• flat_var (float)

• read_noise (float)

• rel_scint_noise (float)

Return type:

float | numpy.typing.NDArray