The poem is beautiful and the translations do its sophisticated simplicity no justice.
Thanks to the OP, by the way, for the astronomical article. I have tried to date the poem as well. And the imagery of the Nebra sky disk made me try even harder.
I was reading the blogpost linked by OP criticising the coverage of the paper (https://rogueclassicism.com/2016/05/16/problems-with-the-sci...) and it has an image of the poem as it's cited in the paper. Indeed, it says "δέδυκε" and "παρά δ' ἔρχετ‘ ὤρα".
I suspect someone tried to copy the poem from the original paper and left behind a few characters, because LaTex. Or in any case some kind of transcription error occurred and nobody noticed because, well, ancient Greek.
The language is tricky since Attic is only covered in introductory courses and this has sone non-Attic forms. For those of you who want to have a go in trying you hand at your own translation here are some short but useful notes (http://aoidoi.org/poets/sappho/sap-2.html). I had an earlier version of these notes that were longer, i.e. he pointed out the tmesis in Line 3.