A Model of Cube-Sat 14 A Model of Cube-Sat Abhishek Silwal *,1 , Abhishek Ghimire 1 , Kapalik Khanal 1 , and Umesh Kanta Ghimire 1 1 Department of Electronics and Computer Engineering, Thapathali Campus, Institute of Engineering, Tribhuvan University, Kathmandu, Nepal * Corresponding Email: abhisilwal775@gmail.com ABSTRACT Weather satellite is a type of satellite which is mainly used for the monitoring of the weather and climate of the Earth. This project purposes the creation of a working model of weather cube-sat, a weather Pico- satellite to monitor the condition of a small geographical area and determine its weather conditions and pollution level. Various sensors like temperature, barometric, humidity, dust and lux intensity sensors as well as a rain detector is used to measure the corresponding physical quantities and situations for this purpose. This system uses nRF transceivers for the transmission of data from the cube-sat to the ground station. Even though it is not included in our project, it is also possible to forecast the weather for the area based on previous values measured from the system. For the validation of the project, the measured data were compared with each other as well as the corresponding values of the physical quantities measured from other devices to check for its consistency and accuracy. Keywords: nRF Transceiver, Weather Conditions, Weather Pico-satellite 1. INTRODUCTION The weather satellite is a type of satellite that is primarily used to monitor the weather and climate of the Earth. Satellites can be polar orbiting, covering the entire Earth asynchronously, or geostationary, hovering over the same spot on the equator. [1] Meteorological satellites see more than clouds and cloud systems: city lights, fires, effects of pollution, auroras, sand and dust storms, snow cover, ice mapping, boundaries of ocean currents, energy flows, etc. Other types of environmental information are collected using weather satellites. Other environmental satellites can detect changes in the Earth's vegetation, sea state, ocean color, and ice fields. A CubeSat (U-class spacecraft) is a type of miniaturized satellite for space research that is made up of multiples of 10 cm × 10 cm × 11.35 cm cubic units. CubeSats have a mass of no more than 1.33 kilograms per unit [2], and often use commercial off-the-shelf (COTS) components for their electronics and structure. CubeSats are commonly put in orbit by deployers on the International Space Station, or launched as secondary payloads on a launch vehicle. Over 1000 CubeSats have been launched as of January 2019. Over 900 have been successfully deployed in orbit and over 80 have been destroyed in launch failures.