Is there an IRAM satellite that measures thermal radiation at 250 GHz, or was this a ground-based instrument? The Nature Research Letter A Pluto-like radius and a high albedo for the dwarf planet Eris from an occultation (also here and here) says about half-way through:

We now reassess Eris’ surface temperature in the light of our new results. Measurements by the Spitzer22 and IRAM11 satellites imply disk-averaged brightness temperatures of Tb=30±1.2 K and Tb=38±7.5 K at 70 and 1,200 mm, respectively.

11Bertoldi,F.F.Altenhoff,W.Weiss,A.,Menten,K.M.&amp;Thum,C.Thetrans-neptunian object UB313 is larger than Pluto. Nature 439, 563–564 (2006).

22Stansberry, J. et al. in The Solar System beyond Neptune (eds Barucci, M. A., Boehnhardt, H., Cruikshank, D. P. &amp; Morbidelli, A.) 161–179 (Univ. Arizona Press, 2008).



The caption of Figure 1 of reference 11 (Bertoldi et al. 2006) mentions:

The 117-element MAMBO-2 camera has an effective frequency for thermal radiation of 250 GHz, a half-power bandwidth of 80 GHz (210–290 GHz), and a beam size of 10.7 arcsec (corresponding to 760,000 km at a distance of 96 AU).

and I think it refers to

Welcome to the home of MAMBO; the &quot;Max-Planck-Millimeter-Bolometer&quot;
IRAM/MAMBO2.250GHz

Question: Is the use of the word satellites in &quot;Measurements by the Spitzer22 and IRAM11 satellites...&quot; correct, or does the latter refer to terrestrial measurments?
The Nature paper by Bertoldi et al. (2006) says:

Our millimetre observations were performed with the Max-Planck Millimeter Bolometer (MAMBO-2) array detector at the IRAM 30 m telescope on Pico Veleta, Spain.

This is a ground-based telescope in the Spanish Sierra Nevada mountains at 2850m to try and get above as much of the precipitable water vapor, which has a very large effect on sub-mm observations, as possible. Its website is here
Since it's common to refer to the Spitzer and its predecessor, the IRAS mission, when discussing far-infrared observations, I suspect the authors typed &quot;IRAM&quot;, thought &quot;IRAS (satellite)&quot; and made a simple typo that was not caught before publication.