NOVELTY - The apparatus has a carrier (5) that is conveyed through a borehole (2) penetrating a formation (4). A probe (17) is extended from carrier to seal with a wall of borehole. A fluid analysis sensor is arranged at carrier to sense a property of a formation fluid sample extracted from formation by probe. A coring device is positioned at carrier to extract a core sample. A core sample analysis sensor is mounted at carrier to sense a property of core sample. A processor receives data from fluid analysis and core sample analysis sensors to estimate the property using data.    USE - Apparatus for estimating property of earth formation used for hydrocarbon production, geothermal production and carbon dioxide sequestration by petro-analyst.    ADVANTAGE - The operator or petro-analyst at the surface of the earth can continuously monitor sensor measurements performed on the formation by sensors in the sensor module so as to send a command to the downhole tool to obtain a fluid sample and a core sample and to perform accurate measurements on the samples when the sensors indicate a characteristic or property of interest to the petro-analyst. Hence, the operator and petro-analyst can make more efficient use of drilling resource resources by avoiding locations in the formation that are not interest. Several fluid and core samples can be extracted at different formation depths during short halts in drilling without requiring removal of a sample tool from a borehole every time after the sample is taken. Thus, the use of drilling resources is optimized effectively. All formation testing and sampling can be performed in one pass through the borehole by the downhole tool so that the downhole tool uses the probe for extracting both a fluid sample and a core sample. Thus, the use of a single probe provides for a more compact downhole tool that can be effectively fitted within the constraints of the borehole and the drill string while limiting mud infiltrate invasion during fluid sampling and providing a shorter path to the probe for the virgin formation fluid to flow.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for estimating property of earth formation.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the while-drilling tool positioned in borehole penetrating the earth formation.    Borehole (2)    Earth (3)    Formation (4)    Carrier (5)    Probe (17)