This object has a geometric albedo of 0.2794. Photometric observations during 2008 showed a rotation period of 16.6076 ± 0.0006 hours and a brightness variation of 0.30 ± 0.02 in magnitude.
677 Aaltje is orbiting within the 7/3 Kirkwood gap. This means it has an 7:3 orbital resonance with Jupiter, completing seven orbits for every three orbits of the planet. For smaller objects, this would typically lead to orbital instability, causing it to shift to a different orbital period. However, 677 Aaltje is too large for its orbit to have been moved by more than about 0.01 AU over the lifetime of the Solar System. What is more likely is that orbital interactions with the dwarf planetCeres may have shifted it to the present-day orbit—the orbit of 677 Aaltje leads it into relatively close encounters with Ceres.
^Oey, Julian (October 2009), "Lightcurve Analysis of Asteroids from Leura and Kingsgrove Observatory in the Second Half of 2008", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers36 (4): 162–164, Bibcode:2009MPBu...36..162O