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Gateway Centaur and Jupiter co-orbital P/2019 LD2 (ATLAS) (Sarid et al. 2019)provides the first opportunity to observe the migration of a Solar System smallbody from a Centaur orbit to a Jupiter Family Comet (JFC) four decades from now(Kareta et al., 2020; Hsieh et al. 2020). The Gateway transition region isbeyond where water ice can power cometary activity, and coma production thereis as poorly understood as in all Centaurs. We present contemporaneousmulti-wavelength observations of LD2 from 2020 July 2-4: Gemini-North visibleimaging, NASA IRTF near-infrared spectroscopy, and ARO SMTmillimeter-wavelength spectroscopy. Precovery DECam images limit the nucleu'seffective radius to <=1.2 km and no large outbursts were seen in archivalCatalina Sky Survey observations. LD2's coma has g'-r'=0.70+/-0.07,r'-i'=0.26+/-0.07, a dust production rate of ~10-20 kg/s, and an outflowvelocity between v~0.6-3.3 m/s. We did not detect CO towards LD2 on 2020 July2-3, with a 3-sigma upper limit of Q(CO) < 4.4 * 10^27 mol/s (<200 kg/s).Near-infrared spectra show evidence for water ice at the 1-10% level dependingon grain size. Spatial profiles and archival data are consistent with sustainedactivity. The evidence supports the hypothesis that LD2 is a typical smallCentaur that will become a typical JFC, and thus it is critical tounderstanding the transition between these two populations. Finally, we discusspotential strategies for a community-wide, long baseline monitoring effort.

Contemporaneous Multi-Wavelength and Precovery Observations of Active Centaur P/2019 LD2 (ATLAS