 sirsalis is a relatively young lunar impact crater located near the western lunar limb, to the southwest of the oceanus procellarum. the crater lies across a ridge that runs in a northâsouth direction. it has a sharp edge and a low central peak. the crater overlaps the slightly larger and older sirsalis a to the west-southwest, and the two form a distinctive feature. to the east is a rille system named the rimae sirsalis. the longest of these rilles follows a line running approximately north-northeast to south-southwest, just clearing the southeastern rim of sirsalis by about 10 kilometers. this long rille runs 330 kilometers from the shore of oceanus procellarum until it crosses the crater darwin a and intersects the rimae darwin to the east of darwin. ==satellite craters== by convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to sirsalis. {| class="wikitable" !width="25%" style="background:#eeeeee;" |sirsalis !width="25%" style="background:#eeeeee;" |latitude !width="25%" style="background:#eeeeee;" |longitude !width="25%" style="background:#eeeeee;" |diameter |- |align="center"|a |align="center"|12.7Â° s |align="center"|61.3Â° w |align="center"|49&nbsp;km |- |align="center"|b |align="center"|11.1Â° s |align="center"|63.7Â° w |align="center"|16&nbsp;km |- |align="center"|c |align="center"|10.3Â° s |align="center"|63.8Â° w |align="center"|22&nbsp;km |- |align="center"|d |align="center"|9.9Â° s |align="center"|58.6Â° w |align="center"|35&nbsp;km |- |align="center"|e |align="center"|8.1Â° s |align="center"|56.5Â° w |align="center"|72&nbsp;km |- |align="center"|f |align="center"|13.5Â° s |align="center"|60.1Â° w |align="center"|13&nbsp;km |- |align="center"|g |align="center"|13.7Â° s |align="center"|61.7Â° w |align="center"|30&nbsp;km |- |align="center"|h |align="center"|14.0Â° s |align="center"|62.4Â° w |align="center"|26&nbsp;km |- |align="center"|j |align="center"|13.4Â° s |align="center"|59.8Â° w |align="center"|12&nbsp;km |- |align="center"|k |align="center"|10.4Â° s |align="center"|57.3Â° w |align="center"|7&nbsp;km |- |align="center"|t |align="center"|9.2Â° s |align="center"|53.4Â° w |align="center"|16&nb
Impact_craters_on_the_Moon LQ18_quadrangle