Photometric data for 2020 & 2021 perihelion JFCs

The csv files for all 2020 and 2021 perihelion JFCs detectable by the Asteroid Terrestrial-impact Last Alert System (ATLAS).

image - image identifier in ATLAS

mjd - Modified Julian Date

rh - Heliocentric distance (au) 

delta - Geocentric distance (au)

alpha - Phase angle (°)

appix - aperture in pixels 

x - X position of object centre (pixels)

y - Y position of object centre (pixels)

counts - Counts

sky - Sky background

err - Sky background uncertainty

snr - Signal to noise ratio

mag - Magnitude

mag_err - Magnitude uncertainty

afp - Afρ (cm)

afp_err - Afρ uncertainty (cm)

afp_zero - A(0°)fρ (cm)

afp_zero_err - A(0°)fρ uncertainty (cm)

filter - ATLAS filter (c/o)

mdust - very rough estimate of mass loss rate (kg/s) - assuming albedo = 0.1, dust density = 1000g/cm^3, grain radius = 1μm. Please refer to the in-text upper limits of mass loss rate and the assumed values associated with the calculation in-text. 

mdust_err - uncertainty in mass loss rate