Hi,
to my knowledge there is no OID for the object tracking status. There is the CISCO-RTTMON-MIB which includes several OID's for IP SLA monitoring.
If the advanced tracking object is linked to an IP SLA, you can use the rttMonLatestRttOperSense OID to get the latest status code of the IP SLA operation.
.1.3.6.1.4.1.9.9.42.1.2.10.1.2.
If you simply have object tracking, I'm afraid there is no OID to check the up/down status.
hope this helps,
Fabrizio