摘要
Purpose The Hard X-ray Modulation Telescope is China’s first X-ray astronomy satellite launched on June 15,2017,dubbed Insight-HXMT.Active and passive thermal control measures are employed to keep devices at suitable temperatures.In this paper,we analyzed the on-orbit thermal monitoring data of the first 5 years and investigated the effect of thermal deformation on the point spread function(PSF)of the telescopes.Methods We examined the data of the on-orbit temperatures measured using 157 thermistors placed on the collimators,detectors and their support structures and compared the results with the thermal control requirements.The thermal deformation was evaluated by the relative orientation of the two star sensors installed on the main support structure.Its effect was estimated with evolution of the PSF obtained with calibration scanning observations of the Crab nebula.Conclusion The on-orbit temperatures met the thermal control requirements thus far,and the effect of thermal deformation on the PSF was negligible after the on-orbit pointing calibration.
基金
This work was based on the data from Insight-HXMT mission,a project funded by the China National Space Administration(CNSA)and the Chinese Academy of Sciences(CAS)
We gratefully acknowledge the support from the National Program on Key Research and Development Project(Grant No.2021YFA0718500)from the Ministry of Science and Technology of China(MOST)
All authors appreciate the supports from the National Natural Science Foundation of China under Grants 12273043,U1838201,U1838202,U1938102,and U1938108
This work was partially supported by International Partnership Program of Chinese Academy of Sciences(Grant No.113111KYSB20190020)
Appreciate Zeyu Song from IHEP for meticulous translation and revision.Appreciate Yongping Li from IHEP for helping with star sensor quaternion calculation.
