Table:
text: List of NGC objects (6001–7000)
6601–6700
6601–6700
NGC_number Object_type Constellation Right_ascension_J2000_ Declination_J2000_
6638 Globular cluster Sagittarius 18h30m56.2s °29′47″
6639 Open cluster Scutum 18h30m59.3s °09′21″
6640 Galaxy Lyra 18h28m08.3s °34′18″
6641 Galaxy Hercules 18h28m57.4s °22′54″
6642 Globular cluster Sagittarius 18h31m54.2s °28′34″
6643 Galaxy Draco 18h19m46.4s °74′34″
6644 Planetary nebula Sagittarius 18h32m34.7s °07′44″
6645 Open cluster Sagittarius 18h32m37.9s °53′02″
6646 Galaxy Lyra 18h29m38.7s °39′51″
6647 Open cluster Sagittarius 18h32m49.3s °13′43″
6648 Double star Draco 18h25m37.8s °64′58″
6649 Open cluster Scutum 18h33m27.9s °24′10″
6650 Galaxy Draco 18h25m28.0s °68′00″
6651 Galaxy Draco 18h24m19.7s °71′36″
6652 Globular cluster Sagittarius 18h35m45.7s °59′25″
6653 Galaxy Pavo 18h44m38.4s °15′48″
6654 Galaxy Draco 18h24m07.6s °73′11″
6655 Double star Scutum 18h34m30.9s °55′15″
6656 Globular cluster Sagittarius 18h36m24.2s °54′12″

Question: Name the object type with an NGC number greater than 6638 and RA of 18h25m37.8s among the 6601-6700 of the list of NGC objects (6001-7000)?