Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| NGC number | Object type | Constellation | Right ascension ( J2000 ) | Declination ( J2000 ) |
| --- | --- | --- | --- | --- |
| 6601.0 | Galaxy | Draco | 18h11m44.3s | °27′12″ |
| 6602.0 | Galaxy | Hercules | 18h16m34.3s | °02′39″ |
| 6603.0 | Open cluster | Sagittarius | 18h18m | °26′ |
| 6604.0 | Cluster w/nebulosity | Serpens Cauda | 18h18m02.9s | °14′35″ |
| 6605.0 | Open cluster | Serpens Cauda | 18h16m21.7s | °00′55″ |
| 6606.0 | Galaxy | Lyra | 18h14m41.6s | °43′16″ |
| 6607.0 | Galaxy | Draco | 18h12m14.7s | °61′19″ |
| 6608.0 | Galaxy | Draco | 18h12m28.9s | °61′17″ |
| 6609.0 | Galaxy | Draco | 18h12m33.6s | °61′19″ |
| 6610.0 | Galaxy | Hercules | 18h11m51.2s | °58′54″ |
| 6611.0 | Open cluster | Serpens | 18h19m | °49′ |
| 6612.0 | Galaxy | Lyra | 18h16m10.8s | °36′04″ |
| 6613.0 | Open cluster | Sagittarius | 18h20m | °06′ |
| 6614.0 | Galaxy | Pavo | 18h25m07.7s | °14′51″ |
| 6615.0 | Galaxy | Ophiuchus | 18h18m33.5s | °15′54″ |
| 6616.0 | Galaxy | Hercules | 18h17m41.1s | °14′18″ |
| 6617.0 | Galaxy | Draco | 18h14m02.5s | °19′10″ |
| 6618.0 | Open cluster | Sagittarius | 18h20m26s | °11′ |
| 6619.0 | Galaxy | Hercules | 18h18m55.5s | °39′20″ |
| 6620.0 | Planetary nebula | Sagittarius | 18h22m54.1s | °99′18″ |
| 6621.0 | Galaxy | Draco | 18h12m55.3s | °21′48″ |
| 6622.0 | Galaxy | Draco | 18h12m59.8s | °21′14″ |
| 6623.0 | Galaxy | Hercules | 18h19m42.9s | °42′20″ |
| 6624.0 | Globular cluster | Sagittarius | 18h23m40.7s | °21′39″ |
| 6625.0 | Open cluster | Scutum | 18h23m02.0s | °01′26″ |
| 6626.0 | Globular cluster | Sagittarius | 18h24m32.9s | °52′11″ |
| 6627.0 | Galaxy | Hercules | 18h22m38.9s | °15′41″ |
| 6628.0 | Galaxy | Hercules | 18h22m21.9s | °23′28″ |
| 6629.0 | Planetary nebula | Sagittarius | 18h25m42.4s | °12′10″ |
| 6630.0 | Galaxy | Pavo | 18h32m35.1s | °17′36″ |
| 6631.0 | Open cluster | Scutum | 18h27m11.3s | °01′52″ |
| 6632.0 | Galaxy | Hercules | 18h25m03.1s | °27′32″ |
| 6633.0 | Open cluster | Ophiuchus | 18h27m31.2s | °34′12″ |
| 6634.0 | Globular cluster | Sagittarius | 18h31m23.2s | °20′53″ |
| 6635.0 | Galaxy | Hercules | 18h27m37.1s | °14′49″ |
| 6636.0 | Galaxy | Draco | 18h22m03.9s | °66′37″ |
| 6637.0 | Globular cluster | Sagittarius | 18h31m23.2s | °20′53″ |
| 6638.0 | Globular cluster | Sagittarius | 18h30m56.2s | °29′47″ |
| 6639.0 | Open cluster | Scutum | 18h30m59.3s | °09′21″ |
| 6640.0 | Galaxy | Lyra | 18h28m08.3s | °34′18″ |
| 6641.0 | Galaxy | Hercules | 18h28m57.4s | °22′54″ |
| 6642.0 | Globular cluster | Sagittarius | 18h31m54.2s | °28′34″ |
| 6643.0 | Galaxy | Draco | 18h19m46.4s | °74′34″ |
| 6644.0 | Planetary nebula | Sagittarius | 18h32m34.7s | °07′44″ |
| 6645.0 | Open cluster | Sagittarius | 18h32m37.9s | °53′02″ |
| 6646.0 | Galaxy | Lyra | 18h29m38.7s | °39′51″ |
| 6647.0 | Open cluster | Sagittarius | 18h32m49.3s | °13′43″ |
| 6648.0 | Double star | Draco | 18h25m37.8s | °64′58″ |
| 6649.0 | Open cluster | Scutum | 18h33m27.9s | °24′10″ |
| 6650.0 | Galaxy | Draco | 18h25m28.0s | °68′00″ |
| 6651.0 | Galaxy | Draco | 18h24m19.7s | °71′36″ |
| 6652.0 | Globular cluster | Sagittarius | 18h35m45.7s | °59′25″ |
| 6653.0 | Galaxy | Pavo | 18h44m38.4s | °15′48″ |
| 6654.0 | Galaxy | Draco | 18h24m07.6s | °73′11″ |
| 6655.0 | Double star | Scutum | 18h34m30.9s | °55′15″ |
| 6656.0 | Globular cluster | Sagittarius | 18h36m24.2s | °54′12″ |
| 6681.0 | Globular cluster | Sagittarius | 18h43m12.6s | °17′31″ |
| 6694.0 | Open cluster | Scutum | 18h45m | °23′ |
Question:
Name the object type with an NGC number more than 6638 and right ascensions being 18h25m37.8s
Answer:
Double star