Views are not completely aligned so some motions are fictitious.
Images being compared: Ritchey 1910(1) - Pilato 2003(2)
van Maanen's comparison stars(3) are annoted in red.
M33 Blink Comparators by Quadrant
Northwest -
Northeast -
Southeast -
Southwest
Notes
Serendipity Objects
References
(1) Hubble, Edwin, "A Spiral Nebula as a Stellar System," Contributions from the Mt. Wilson Observatory," No. 310, 1 (1926). NADS - Reprinted from the Astrophysical Journal, 63, pp. 236-274, (1926).
(2) 2003 astrograph of M33 courtesy of Dark Star Images by Tony Pilato.
(3) van Maanen, A., "Investigations on Proper Motion - Tenth Paper: Internal Motion in the Spiral Nebula Messier 33, N.G.C. 598" - ApJ 57, 264-278 (1923) - NADS - (van Maanen's Plate XV is an annotated version of Milton Humason's 1922 photograph of M33.)