From Tolkien Gateway

Helluin was the name in Middle-earth for the blue star known today as Sirius, the "Dog Star".[1][2]

Etymology[edit | edit source]

The second element in Helluin is most probably Quenya luinë ("blue").[3]

It's possible that the first element refers to "ice" (see: Helcar) in which case the name means "ice-blue".[4]

Other versions of the legendarium[edit | edit source]

In the earliest version of the legendarium in The Book of Lost Tales, the star was called Nielluin ("Azure Bee" or "Blue Bee") in Qenya.[5] Another Qenya variants were Nierninwa and Niellúnë, and its Gnomish name was Niothluimi.[6]


Middle-earth Cosmology
 Constellations  Anarríma · Durin's Crown · Menelmacar · Remmirath · Soronúmë · Telumendil · Valacirca · Wilwarin
Stars  Alcarinquë · Borgil · Carnil · Elemmírë · Helluin · Luinil · Lumbar · Morwinyon · Nénar · Star of Eärendil · Til 
The Airs  Aiwenórë · Fanyamar · Ilmen · Menel · Vaiya · Veil of Arda · Vista
Narsilion  Arien · Moon (Isil, Ithil, Rána) · Sun (Anar, Anor, Vása) · Tilion
See also  Abyss · Arda · Circles of the World · · Timeless Halls · Two Lamps · Two Trees · Void