[3] Beginning in 2018, after a NASA grant to owner Michael Schwartz expired, control of the Arizona observatory was turned over to Gianluca Masi's Virtual Telescope project.

[4] The observatory near Cottage Grove, Oregon was constructed c. 1998, and had a 14-inch (360 mm) Celestron Schmidt-Cassegrain with a SBIG CCD imager, probably upgraded to Apogee Instruments later.

Tenagra II is a custom-made 32-inch (810 mm) Ritchey-Chretien telescope manufactured by SciTech Astronomical Research, in operation since 2001.

[9] Paulo R. Holvorcem (Porto Seguro, Bahia, Brazil) and Michael Schwartz (Patagonia, Arizona) discovered comet C/2011 K1 (Schwartz-Holvorcem) [uk] in May 2011.

In 2018, imagery from the Arizona observatory was livestreamed by Gianluca Masi during the 2018 DV1 close approach to Earth as a Virtual Telescope project outreach event.