first hypothesized in 2006 by John Stansberry and collaborators, who noted that the primary seemed to have an unusually low density. Further evidence to the existence of an inner component was posited by Seth Jacobson and Jean-Luc Margot in October 2007, who noticed a distinct elongation of the primary in Hubble images. The binarity of the Lempo primary was eventually confirmed in a more extensive analysis of Hubble images by Susan Benecchi, Keith Noll, Will Grundy and Hal Levison in 2009. Due to complex discovery circumstances involving different independent groups of researchers, Hiisi did not have a formal provisional designation signifying the year of its first observation or discovery. Instead, it was unofficially designated "component A2" in scientific literature for being the smaller component of the central Lempo–Hiisi binary. It eventually received its permanent satellite designation and name while the larger, first component A1 maintained the name Lempo on 5 October 2017. The separation between the two components is only about half the diffraction limit of Hubble, making it impossible to fully resolve the system. Instead, it appears elongated in Hubble images, revealing its binary nature. This central pair has a semi-major axis of around 867 km and a period of about 1.9 days. Assuming equal albedos of about 0.079, Lempo and Hiisi are approximately and in diameter, respectively. Assuming a uniform density for all components, the mass of Hiisi itself . Paha Paha, officially designated (47171) Lempo I Paha, is the smaller, outer component of the Lempo triple system. It was discovered on 8 December 2001 by astronomers Chadwick Trujillo and Michael Brown using the Hubble Space Telescope's Space Telescope Imaging Spectrograph to survey for binary trans-Neptunian objects. The discovery was reported in an IAU Circular notice published by the International Astronomical Union 10 January 2002. The confirmation of Paha in archival 4 October 2001 observations from the Lick Observatory's Shane telescope adaptive optics system was reported in a follow-up IAU Circular published on 24 January 2002. Paha previously had the temporary provisional designation before it was changed to S/2001 (47171) 1 after Lempo was numbered. Being the smaller, outer component on a circumbinary orbit around the central Lempo–Hiisi binary, it was sometimes designated "component B" in scientific literature. It received its permanent satellite designation and name alongside Lempo and Hiisi on 5 October 2017. In unfiltered visual wavelengths, Paha appears 2.2 magnitudes dimmer than the primary on average,