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Jesse Young, son of Richard Young (MP), is known to have taken part in a Giles expedition: https://academic.oup.com/mnras/article/70/4/302/1058650. It says there he was an astronomer. More research needed, but this may be a match. Charles Matthews ( talk) 20:05, 21 December 2022 (UTC) reply

On the point raised about Jess being an abbreviation, the two 1878 articles https://www.jstor.org/stable/2463880 and https://www.jstor.org/stable/196436 about Young and the American Geographical Society use respectively Jesse and Jess. So Jess is the short form, and he preferred to refer to himself that way. Charles Matthews ( talk) 04:04, 22 December 2022 (UTC) reply

A reference for the son of Richard Young is https://venn.lib.cam.ac.uk/cgi-bin/search-2018.pl?sur=&suro=w&fir=&firo=c&cit=&cito=c&c=all&z=all&tex=YN877J&sye=&eye=&col=all&maxcount=50 for Jess Young. The obituary at https://www.outbackfamilyhistoryblog.com/jesse-young-a-life-well-lived/ is consistent with that, but adds much further detail. The mention in it of education in St Andrews is supported by https://www.britishnewspaperarchive.co.uk/viewer/bl/0000447/18660719/034/0001, where Jesse Young of Wisbech attends David James Smeaton's Abbey Park School.

Apart from detailed questions about exact dates and movements in 1874/5, there doesn't seem to be much reason to doubt the identification. Charles Matthews ( talk) 04:14, 22 December 2022 (UTC) reply