Neptune’s HCl upper limit from Herschel/HIFI

An upper limit on gas production from 3200 Phaethon

Asteroid 3200 Phaethon resembles a comet in some ways, including a highly-eccentric orbit (e∼ 0.89) and a strong associated meteor shower (the Geminids). Yet this object has never been observed to exhibit any cometary activity, i.e., gas production. We observed 3200 Phaethon with the Caltech Submillimeter Observatory on two occasions, once while it was near its closest approach to Earth as it n...

Upper limit on the tau-neutrino mass.

S. Abachi, C. Akerlof, P. Baringer, I. Beltrami, t'~ D. Blockus, G. Bonvicini, B. Brabson, B. G. Bylsma, J. Chapman, B. Cork, R. DeBonte, M. Derrick, D. Errede, K. K. Gan, S. W. Gray, tb~ N. Harnew, t'~ C. Jung, P. Kesten, td~ D. Koltick, P. Kooijman, F. J. Loeffler, J. S. Loos, E. H. Low, R. L. McIlwain, D. I. Meyer, D. H. Miller, B. Musgrave, H. Neal, D. Nitz, C. R. Ng, H. Ogren, L. E. Price,...

The Upper Limit of C-14 Age?

Upper altitude limit for Rayleigh lidar

It has long been assumed that Rayleigh lidar can be used to measure atmospheric temperature profiles up to about 90 or 100 km and that above this region the technique becomes invalid due to changes in atmospheric composition which affect basic assumptions on which Rayleigh lidar is based. Modern powerful Rayleigh lidars are able to measure backscatter from well above 100 km requiring a closer e...

The Stellar Upper Mass Limit Preserved

This article is based on data gathered with three facilities: the NASA/ESA Hubble Space Telescope (HST), the 6.5 m Magellan Telescopes at Las Campanas Observatory (LCO), and the 2.15-m J. Sahade telescope at Complejo Astronómico El Leoncito (CASLEO). The HST observations are associated with GO program 10602. HST is controlled from the Space Telescope Science Institute, which is operated by the ...