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.&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. & 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

Question: Is the use of the word satellites in "Measurements by the Spitzer22 and IRAM11 satellites..." 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 "IRAM", thought "IRAS (satellite)" and made a simple typo that was not caught before publication.


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