Lat: 15.7°S, Long: 61.7°W, Length: 426 km, Depth: km, Rükl: 50
One of the longest clefts on the visible surface runs immediately E. of this formation Sirsalis. Commencing at a minute crater on the N. of it, it grazes the foot of the E. glacis; then, passing a pair of small overlapping craters (resembling Sirsalis and its companion in miniature), it runs through a very rugged country to a ring-plain W. of De Vico (De Vico a), which it traverses, and, still following a southerly course, extends towards Byrgius, in the neighbourhood of which it is apparently lost at a ridge, though Schmidt and Gaudibert have traced it still farther in the same direction. It is at least 300 miles in length, and varies much in width and character, consisting in places of distinct crater-rows.
- Magnetic field anomaly and nearby gravity anomaly. Milbury et al, 2008
- 1937 description and drawing by SRB Cooke.
- Named from nearby crater. (Sirsalis)
- In the original IAU nomenclature of Blagg and Müller (1935) there were three Roman-numeralled rilles associated with Sirsalis (I, II, and III), and a separate feature known as the Sirsalis Cleft.
- This name (presumably the latter one) was Latinized to Rima Sirsalis in 1964 IAU Transactions XIIB.
- The deep southern end of the rille was known as Rima Byrgius (and, before that, the Byrgius Cleft).
- It is not entirely clear when these rille names were consolidated into the present Rimae Sirsalis.
L77: Procellarum basin radial rilles.
Wood, C.A. 10/2005. The Straight Story on Linear Rilles. S&T 110(4):62-63
Harold Hill. A Portfolio of Lunar Drawings, pages 144, 145.