Lat: 1.3°N, Long: 1.5°E, Diam: 5 km, Depth: 0.92 km, Rükl: 33
- Two west-looking oblique Hasselblad frames on color film, made during the mission of Apollo 10, show Blagg in Sinus Medii at local sunrise (local morning light). These two frames are:
- AS10-27-3905 (appearing together with nearby Bruce, and Rhaeticus L near the frame's lower margin)
- AS10-27-3906 (appearing together with nearby Bruce, sunrise terminator in the distance)
- Note that these two frames were frequently reproduced (printed) in popular books of manned spaceflight and pre-Apollo 11 literature.
- Research Apollo 10 photography: Danny Caes
Depth data from Kurt Fisher database
- Arthur, 1974: 0.92 km
- Westfall, 2000: 0.92 km
- Viscardy, 1985: 0.9 km
- Named for Mary Adela Blagg (1858-1944), a British astronomer who compiled the Collated List of Lunar Formations and coauthored Blagg and Müller Named Lunar Formations. She was equally noted for her work on variable stars.
- This crater was Catalog Number 855 in Mary Blagg's Collated List, where it is noted that it was one of two Triesnecker c's in Beer and Mädler, and also called Triesnecker c in Neison, 1876.
- According to F. W. Dyson's Introduction to Named Lunar Formations (page V), acting on a recommendation made by Lamèch he personally insisted, over Miss Blagg's objections, that the name be changed to Blagg in the final publication. The name does not appear to be mentioned in any of the IAU Transactions.
- List of features named for women.
- The wrinkle ridge which is running straight through Blagg (across Sinus Medii; north of Blagg / south of Blagg) is unofficially called Dorsum Blagg by - DannyCaes Sep 10, 2011.
- P.M. Ryves. 1945 Mary Adela Blagg. Monthly Notices of the Royal Astronomical Society, Vol. 105, pp. 65-66.