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AMSAT ECHO is classified as:

NORAD ID: 28375
Int'l Code: 2004-025K
Perigee: 701.6 km
Apogee: 817.5 km
Inclination: 98.4 °
Period: 99.9 minutes
Semi major axis: 7130 km
RCS: 0.081 m2 (small)
Launch date: June 29, 2004
Source: United States (US)
Uplink (MHz): 145.920
Downlink (MHz): 435.300
Beacon (MHz): 435.150
Mode: FM_tone 67.0Hz
Call sign:
Status: Inactive

Amsat-Echo, also known as AMSAT Oscar-E or AO-51, is an American amateur communications microsatellite satellite (10 kg) that relays amateur transmissions. AO-51 contains an FM repeater with both a 144 MHz and 1.2 GHz uplink and 435 MHz and 2.4 GHz downlinks. Additionally AO-51 contains a digital subsystem that transmits TLM on 70cm and provides complete PACSAT BBS that can be configured on both V and S band uplinks. There is also a 10 meter PSK uplink.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 28375U 04025K   17174.81815714 -.00000007 +00000-0 +11516-4 0  9997
2 28375 098.3587 108.1388 0081286 263.4691 095.7239 14.41842477682779
Source of the keplerian elements: AFSPC