Where's Wiki Id 102100 in ArcMap 10

[JeffPerkins]

Just got up and going with AGS10.  Loving it!!   Just published my first 10 msd to server.  Cleared cached, checked the REST and noticed the spatial ref is 3857 which is  WGS_1984_Web_Mercator_Auxiliary_Sphere ?  Ok... Went back to the map document in ArcMap, checked the spatial ref.  Selected WGS_1984_Web_Mercator (Auxiliary Sphere) again.  Saved, published, cleared cache, checked the REst and noticed the spatial ref is 3857 , again??

So, I've been hunting around in ArcMap for the correct "Spatial Ref" = 102100 ?

Anyone know??

[ReneRubalcava]

Use the WGS_1984_Web_Mercator which is wkid 102113 and is compatible with 102100.
There was a thread a while discussing this, but I forget where it is now, but I don't think there is an explicit 102100 in ArcMap.

[DasaPaddock]

See:
http://forums.arcgis.com/threads/8762-WGS-1984-Web-Mercator-(Auxiliary-Sphere)-WKID-102100

[JeffPerkins]

I can live with that...  

Thanks !