I'm having a difficult time finding information on the [Interstellar Boundary Explorer](https://en.wikipedia.org/wiki/Interstellar_Boundary_Explorer)'s (IBEX) orbit.

Unless I've made some kind of error, the TLE's have stopped at TLE epoch `17162.83` which is 11-Jun-2017. I was doing a quick search for [this answer comparing the orbits](https://space.stackexchange.com/a/23311/12102) of IBEX and [Spektr-R](https://en.wikipedia.org/wiki/Spektr-R).

I noticed while writing [this answer](https://space.stackexchange.com/a/23311/12102) that while I can easily find Spektr-R's orbit in [JPL Horizons](https://ssd.jpl.nasa.gov/horizons.cgi), I can't find IBEX in Horizons under any of its aliases (IBEX, Explorer 91, SMEX-10). 

Wikipedia lists IBEX's web site as <https://www.spaceops.swri.org/> but that page is no help. I found this page: <http://ibex.swri.org/archive/index.shtml> but the last update is in 2014.

I'd like to see IBEX's orbital data, but with no TLEs since June and no Horizons, it's "gone dark" in terms of publicly accessible data.

Is it on a secret mission?

**below:** Orbital parameters from TLE for IBEX (33401) and Spektr-R (37755) since mid 2016. IBEX has "gone dark" and Spektr-R is petering out as well.

[![enter image description here](https://i.stack.imgur.com/AvLy1.png)](https://i.stack.imgur.com/AvLy1.png)

**below:** Historical Orbital parameters from TLEs for IBEX (33401) and Spektr-R (37755) since orbits were established for each. From [this answer](https://space.stackexchange.com/a/23311/12102).

[![enter image description here](https://i.stack.imgur.com/69N4s.png)](https://i.stack.imgur.com/69N4s.png)