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Creed › … › Article 6: "He Ascended Into Heaven and Is Seated at the Right Hand of the Father"
The veiled character of the glory of the Risen One during this time is intimated in his mysterious words to Mary Magdalene: "I have not yet ascended to the Father; but go to my brethren and say to them, I am ascending to my Father and your Father, to my God and your God." This indicates a difference in manifestation between the glory of the risen Christ and that of the Christ exalted to the Father's right hand, a transition marked by the historical and transcendent event of the Ascension.
Source: Catechism of the Catholic Church (Vatican.va)