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We study the formation and the kinematic evolution of the early type HerbigBe star IL Cep and its environment. The young star is a member of the Cep OB3association, at a distance of 798$\pm$9 pc, and has a "cavity" associated withit. We found that the B0V star HD 216658, which is astrometrically associatedwith IL Cep, is at the center of the cavity. From the evaluation of variouspressure components created by HD 216658, it is established that the star iscapable of creating the cavity. We identified 79 co-moving stars of IL Cep at 2pc radius from the analysis of {\textit Gaia} EDR3 astrometry. The transversevelocity analysis of the co-moving stars shows that they belong to twodifferent populations associated with IL Cep and HD 216658, respectively.Further analysis confirms that all the stars in the IL Cep population aremostly coeval ($\sim$ 0.1 Myr). Infrared photometry revealed that there are 26Class II objects among the co-moving stars. The stars without circumstellardisk (Class III) are 65\% of all the co-moving stars. There are 9 intenseH$\alpha$ emission candidates identified among the co-moving stars using IPHASH$\alpha$ narrow-band photometry. The dendrogram analysis on the Hydrogencolumn density map identified 11 molecular clump structures on the expandingcavity around IL Cep, making it an active star-forming region. The formation ofthe IL Cep stellar group due to the "rocket effect" by HD 216658 is discussed.

Clustering of low mass stars around Herbig Be star IL Cep -- Evidence of "Rocket Effect" using Gaia EDR3 ?