Hello Carter11,
Dis-recommended, simply because the Sony A700 has no swivel monitor. Your poor husband will break his neck when focusing objects high up in the sky.
Further:
1. Memory Stick Duo is no good
2. Pixel size of 5.48µm is too large for short focal length telescopes.
3. Big body and 770gr is a lot of weight
4. It is 13 years old
5. Poor battery life
6. Not sure, but maybe no internal intervalometer
Canon is most popular among amateur astronomers, but I am quite satisfied with my Nikon D5300. Perhaps your husband can purchase a second hand DSLR. He will need the body only and it needs to be fully operable in manual mode only. Important is a clean sensor without scratches.
Perhaps this helps:
https://cameradecision.com/compare/Sony-Alpha-DSLR-A700-vs-Nikon-D5600In essential functions the Nikon D5600 is similar to Nikon D5500 and Nikon D5300
Cheers
Robert