subluminous

Definitions

adjective astronomy Describing a star that is fainter than main sequence stars of the same colour

sub- +‎ luminous

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On the right, the sun was slowly sinking behind the ancient trees of the Kuntsevo park — one half of its brilliant disc obscured with grey, subluminous cloud, and the other half sending forth spokes of flaming light which threw the old trees into striking relief as they stood there with their dense crowns of green showing against a blue patch of sky.

Youth 2003
That was nineteen years ago, and she was fled like the leaves and the birds of departed summers; but God's Little Mountain still towered as darkly to the eastward; the wind still leapt sheer from the chapel to the young larches of the Callow; nothing had changed at all; only one more young, anxious, eager creature had come into the towering, subluminous scheme of things.

Gone to Earth Mary Gladys Meredith Webb 1904
On the right, the sun was slowly sinking behind the ancient trees of the Kuntsevo park -- one half of its brilliant disc obscured with grey, subluminous cloud, and the other half sending forth spokes of flaming light which threw the old trees into striking relief as they stood there with their dense crowns of green showing against a blue patch of sky.

Youth Leo Tolstoy 1869