While not a constellation the rainbow is related. In the Eddas the rainbow is called "Bifrost" In the north-western European traditions the rainbow is the road to the sky realm. This road in Norse mythology called the road to Hel (Akkadian EL meaning "high powers" so not the Christian underworld at all). The name Bifrost originates from two Indo-European words, bif, meaning "shimmering" or "trembling," and rost meaning "road." The spirit Heimdall is the guardian of Bifrost. He lives in a house ”high up in the sky.” This indicates Bifrost is a rainbow.
In the poetic Edda, Bifrost is described as a shimmering road and as the road to Asgard.
(August 3, 2023) The Völuspa of the Eddas provides a story about the origin of the stars. The world was created from the body of the Ymer (Akkadian IMu-er = "emotion-maker"). His skull forms the firmament and is held in place by four dwarves, where sparks from Muspellheim (Akkadian MS.PL-realm = "realm of the night.rulers") form the stars. Their place in the sky was determined by the gods and some were given paths they will roam.
In Skáldskaparmál, the story of Tjatse is told. Tjatse managed, with the assistance of Loki, to kidnap Idun, the keeper of the apples of youth, from Asgard. Loki managed to save her but was pursued by Tjatse who got killed. Tjatse's daughter Skade came and demanded compensation for her father. The compensation included among other things a husband. In addition Odin or Thor placed Tjatse's "eyes" in the sky.
Jonas Persson (2003-2023) Norse Constellations. Online at: https://www.digitaliseducation.com/resources-norse.html
References used by Person:
Roslund Curt, Stjärn-Oddi: En vikingatida astronom på Island, Astronomisk årsbok, s 28, 1984 (in Swedish)
Beckman, N. and Kålund, Kr. (1914-16). Alfræði íslenzk: Islandsk encyklo-pædisk litteratur: II. Rímtöl [Encyclopaedic literature on the calendar]. s 48-53 (in Swedish).
Richard Hinckley Allen, Star Names; Their lore and meaning
Saxo Grammaticus, ”Gesta danorum" (In Latin)Rudolf Simek, The Dictionary of Northen Mythology
Jan de Vries, Altgermanische Religionsgeschichte (in German)
Beckman, N. and Kålund, Kr. (1914-16). Alfræði íslenzk: Islandsk encyklo-pædisk litteratur: II. Rímtöl [Encyclopaedic literature on the calendar]. s 72. (in Swedish)
Gislason, K. Fire og fyrretyve for en stor Deel forhen utrykte Prøver af oldnordisk Sprog og Litteratur. (København: Gyldendalska bogh. 1860) (in Danish)
(August 4, 2023) Most Norse Texts use Latin and Greek names for the stars. Yet in Beckman and Kålund’s compilation [7] of Rimtöl they present five constellations that appear to have the Old Norse (Indo-European) names:
Kvennavagn: Woman's chariot; Latin Ursa Minor, (Little Dipper)
Karlvagn: Man's chariot; Latin Ursa Major (Big Dipper)
Ulf's Keptr: Mouth of the Wolf, Greek Hyades Star Cluster in Taurus
Fiskikarlar: Fishermen, Greek Orion
Asar Bardagi: Beckman translates this as "Asar Battlefield," but that is incorrect. Asar Bardagi probably means "Enclosure (ASR) for Seeing (BR) Thu's (Ṭ) Energy (G). Latin Auriga meaning "charioteer" after Greek words representing the same thing.
Beckman, N. and Kålund, Kr. (1914-16). Alfræði íslenzk: Islandsk encyklo-pædisk litteratur: II. Rímtöl [Encyclopaedic literature on the calendar]. s 48-53 (in Swedish).
Arcturus at mid latitudes at night.
Three star names have been identified due to their ending suffix "stjarna." The word "stjarna" now means "star" in Swedish although it derives from the Akkadian phrase ST.IR.N meaning "Allocation.Astrological-Power.Revelation" or "Revealer of an Astrological Power Allocation."
Whether their claimed modern equivalents are true is more uncertain. These stars are:
Dagstjarna: meaning "Manifesting Energy's Astrological Allocation" from Akkadian D.G meaning "life manifestation's energy." Greek Arcturus, also called Alpha Boötis, is the brightest star in Boötes (Herdsman) constellation and the fourth brightest star in the sky. The word "day" in Old Norse is Dag so this is also the "Day Star." The Finnish name for Arcturus is “Aurinkontähti” meaning "Sun Star. " This star seems to act like the star Sirius at more southern latitudes in that it indicates when the sun is about to rise.
Leidarstjarna: meaning "Administering Form's Astrological Allocation" from Akkadian LY.DR meaning "Administering the invisible forms." These are the forms which much then be manifested on earth by filling with amorphous matter. It has been incorrectly identified with the north star (Polaris).
Sudrstjarna: meaning "Caring's Astrological Allocation" from Akkadian SD- meaning "caring." Traditionally translated as "South star" in Old Norse translations which assume Sud is equivalent to modern Norse Syd meaning "south." It has mistakenly been identified with the star Vega which is also called Alpha Lyrae because it is visible in the southern sky during summer and in south at midnight during summer solstice. It is the brightest star in the Latin constellation Lyra and fifth brightest in the night sky. Arguing against this identification is the meaning of the word "Vega" which derives from the Akkadian word Vega/Wega (UGu) meaning "death."