Temperature sensor comprising: - an electrical circuit including a thermistor intended to be placed next to an object; - a temperature measurement module configured for determining a measured temperature (T_M) of the thermistor from an electrical quantity of the electrical circuit that depends on a resistance of the thermistor; and - a command module configured for providing a command to the electrical circuit for modifying the electrical circuit behavior in a way that changes a current flowing in the thermistor; - a thermal loss determination module configured for determining a thermal loss of the thermistor from the thermistor measured temperature (T_M) and the command; and - a temperature estimation module configured for estimating a temperature (T0_E) of the object from the thermistor measured temperature (T_M) and from the thermal loss of the thermistor; wherein the electrical circuit comprises a resistance stage connected to the thermistor so as to form a voltage divider, wherein the temperature measurement module is configured to measure a voltage at a middle point of the voltage divider, wherein the resistance stage has a resistance changing with the command and wherein the resistance stage comprises two resistors (216, 218) in parallel and a switch operated by the command for selectively connect and disconnect one of the two resistors (216, 218), characterized in that: the temperature estimation module comprises: - a global dynamic thermal model configured for providing the object estimated temperature (T0_E), including, coupled together: - a dynamic thermal model of the thermistor having a thermistor thermal loss parameter (L'), and - a dynamic thermal model of the object; - a state observer configured to estimate a thermal loss correction (L*) from the thermistor measured temperature (T_M) and the object estimated temperature (T0_E); and - a correction module configured for correcting the thermal loss of the thermistor according to the thermal loss correction (L*) in order to provide the thermistor thermal loss parameter (L'), wherein the correction module is configured for adding the thermal loss correction (L*) to the thermal loss of the thermistor. - an electrical circuit including a thermistor intended to be placed next to an object; - a temperature measurement module configured for determining a measured temperature (T_M) of the thermistor from an electrical quantity of the electrical circuit that depends on a resistance of the thermistor; and - a command module configured for providing a command to the electrical circuit for modifying the electrical circuit behavior in a way that changes a current flowing in the thermistor; - a thermal loss determination module configured for determining a thermal loss of the thermistor from the thermistor measured temperature (T_M) and the command; and - a temperature estimation module configured for estimating a temperature (T0_E) of the object from the thermistor measured temperature (T_M) and from the thermal loss of the thermistor; wherein the electrical circuit comprises a resistance stage connected to the thermistor so as to form a voltage divider, wherein the temperature measurement module is configured to measure a voltage at a middle point of the voltage divider, wherein the resistance stage has a resistance changing with the command and wherein the resistance stage comprises two resistors (216, 218) in parallel and a switch operated by the command for selectively connect and disconnect one of the two resistors (216, 218), characterized in that: the temperature estimation module comprises: - a global dynamic thermal model configured for providing the object estimated temperature (T0_E), including, coupled together: - a dynamic thermal model of the thermistor having a thermistor thermal loss parameter (L'), and - a dynamic thermal model of the object; - a state observer configured to estimate a thermal loss correction (L*) from the thermistor measured temperature (T_M) and the object estimated temperature (T0_E); and - a correction module configured for correcting the thermal loss of the thermistor according to the thermal loss correction (L*) in order to provide the thermistor thermal loss parameter (L'), wherein the correction module is configured for adding the thermal loss correction (L*) to the thermal loss of the thermistor. - a global dynamic thermal model configured for providing the object estimated temperature (T0_E), including, coupled together: - a dynamic thermal model of the thermistor having a thermistor thermal loss parameter (L'), and - a dynamic thermal model of the object; - a dynamic thermal model of the thermistor having a thermistor thermal loss parameter (L'), and - a dynamic thermal model of the object; - a state observer configured to estimate a thermal loss correction (L*) from the thermistor measured temperature (T_M) and the object estimated temperature (T0_E); and - a correction module configured for correcting the thermal loss of the thermistor according to the thermal loss correction (L*) in order to provide the thermistor thermal loss parameter (L'), wherein the correction module is configured for adding the thermal loss correction (L*) to the thermal loss of the thermistor.