Measurements of the Surface Brightness of the Earthshine with Applications to Calibrate Lunar Flashes | Zendy

P. MontañésRodríguez | Zendy; Ε. Πάλλη | Zendy; Philip R. Goode | Zendy

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Measurements of the Surface Brightness of the Earthshine with Applications to Calibrate Lunar Flashes

Author(s) -

P. MontañésRodríguez,

Ε. Πάλλη,

Philip R. Goode

Publication year - 2007

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/519736

Subject(s) - brightness , magnitude (astronomy) , physics , observatory , calibration , flux (metallurgy) , remote sensing , brightness temperature , surface brightness , astronomy , environmental science , geology , quantum mechanics , galaxy , materials science , metallurgy

We have used the large database of photometric observations of the bright and dark portions of the face of the MoonfromtheEarthshineProjectatBigBearSolarObservatorytodeterminethesurfacebrightnessof theearthshine anditsvariations.Our purposeistomaketheseobservationsappropriateforthecalibrationof lunarflashesaccording totheirmagnitude.Wehaveevaluatedthedaily,seasonal,andannualchangesinmagnitudeforourentiredatasetand have also calibrated the surface brightness of the entire lunar geography for several lunar phases by means of the observation of lunar eclipses. We find variations between +12 and +17 mV arcsec 2 with hourly changes upward of the order 0.25 mV arcsec 2, which are uniquely due to the terrestrial meteorology. This rapid change in the terrestrial fluxreachingtheMoonisusuallyneglectedwhencalibratingthemagnitudeof lunarimpactevents.Wejustifythisusing earthshine observations to determine the brightness for the day, time, and selenographic location of a given event in order to improve the accuracy of its brightness calibration up to 0.25 mag.

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